/* ==============================================================================
   Toss Design System (TDS) Inspired Styling for Interactive Video Tutor
   ============================================================================== */

:root {
  /* Toss Dark Theme (Default) */
  --toss-bg: #101013;
  --toss-surface: #1b1c21;
  --toss-card: #22232a;
  --toss-card-hover: #2a2c35;
  --toss-border: #2c2e38;
  
  --toss-blue: #3182f6;
  --toss-blue-hover: #2272eb;
  --toss-blue-light: rgba(49, 130, 246, 0.12);
  --toss-blue-text: #5397f8;
  
  --toss-text-main: #f9fafb;
  --toss-text-sub: #8b95a1;
  --toss-text-muted: #6b7684;
  
  --toss-bubble-user: #3182f6;
  --toss-bubble-tutor: #22232a;
  --toss-bubble-tutor-border: #2c2e38;
  
  --toss-tag-bg: #282a33;
  --toss-volume-track-empty: rgba(255, 255, 255, 0.22);
  --toss-radius-xl: 24px;
  --toss-radius-lg: 18px;
  --toss-radius-md: 12px;
  --toss-radius-pill: 9999px;
  
  --toss-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  --toss-transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Toss Light Theme (Toggleable) */
body.toss-light {
  --toss-bg: #f2f4f6;
  --toss-surface: #ffffff;
  --toss-card: #ffffff;
  --toss-card-hover: #f9fafb;
  --toss-border: #e5e8eb;
  
  --toss-text-main: #191f28;
  --toss-text-sub: #4e5968;
  --toss-text-muted: #8b95a1;
  
  --toss-bubble-user: #3182f6;
  --toss-bubble-tutor: #ffffff;
  --toss-bubble-tutor-border: #e5e8eb;
  
  --toss-tag-bg: #f2f4f6;
  --toss-volume-track-empty: rgba(0, 0, 0, 0.14);
  --toss-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.hidden {
  display: none !important;
}

/* ─── Toss Clean Scroll (스크롤 기능은 100% 보존, 슬라이드바는 완전 은닉) ─── */
html,
body,
.app-layout,
.toss-main,
.toss-video-section,
.roadmap-list,
.chat-stream,
.pills-scroll {
  scrollbar-width: none !important; /* Firefox */
  -ms-overflow-style: none !important; /* IE, Edge */
}

*::-webkit-scrollbar {
  display: none !important;
  width: 0 !important;
  height: 0 !important;
  background: transparent !important;
}

body {
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
  background-color: var(--toss-bg);
  color: var(--toss-text-main);
  letter-spacing: -0.025em;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  margin: 0;
  padding: 0;
}

.app-layout {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

/* 1. Toss Minimal Navigation */
.toss-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  height: 56px;
  background-color: var(--toss-surface);
  border-bottom: 1px solid var(--toss-border);
  flex-shrink: 0;
  z-index: 20;
  transition: margin-top 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease;
  will-change: margin-top, opacity;
}

/* 일정 시간 후 위로 올라가는 툴바 상태 */
.toss-nav.nav-hidden {
  margin-top: -56px;
  opacity: 0;
  pointer-events: none;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.toss-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--toss-text-main);
}

.toss-symbol {
  font-size: 20px;
  filter: drop-shadow(0 2px 4px rgba(245, 158, 11, 0.4));
}

.toss-chip-sm {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
  background-color: var(--toss-blue-light);
  color: var(--toss-blue-text);
}

.nav-center {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex: 1;
  margin: 0 0 0 8px;
  min-width: 0;
}

/* 툴바 내부로 쏙 들어간 플레이어 액션 바 (강의 구간 옆에 나란히 안착) */
.toss-nav .player-action-bar {
  margin: 0;
  padding: 3px 8px;
  height: 38px;
  background-color: var(--toss-card);
  border: 1px solid var(--toss-border);
  box-shadow: none;
  animation: navActionFadeIn 0.25s ease-out;
}

@keyframes navActionFadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.toss-nav .player-action-bar .ctrl-btn {
  height: 30px;
  padding: 0 9px;
  font-size: 11.5px;
}

.toss-nav .player-action-bar .ctrl-btn.icon-only {
  width: 30px;
  min-width: 30px;
  height: 30px;
  padding: 0;
  border-radius: 50%;
  justify-content: center;
}

/* 툴바 내부에 있을 때 드롭다운(배속 등)은 아래로 펼쳐짐 */
.toss-nav .ctrl-dropdown-menu {
  bottom: auto;
  top: calc(100% + 8px);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 10px;
}



.toss-btn-icon {
  background: none;
  border: 1px solid var(--toss-border);
  color: var(--toss-text-sub);
  width: 36px;
  height: 36px;
  border-radius: var(--toss-radius-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 15px;
  transition: var(--toss-transition);
}

.toss-btn-icon:hover {
  background-color: var(--toss-card-hover);
  color: var(--toss-text-main);
}

.toss-btn-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--toss-radius-pill);
  background-color: var(--toss-card);
  border: 1px solid var(--toss-border);
  color: var(--toss-text-main);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--toss-transition);
}

.toss-btn-pill:hover {
  background-color: var(--toss-card-hover);
  border-color: var(--toss-blue);
}

.toss-btn-pill:active {
  transform: scale(0.96);
}

/* 2. Main Two-Column Layout (드래그 조절식 가변 플렉스 레이아웃) */
.toss-main {
  display: flex;
  flex-direction: row;
  flex: 1;
  width: 100%;
  height: calc(100vh - 56px);
  min-height: 0;
  overflow: hidden;
  position: relative;
}

/* 사이드패널 드래그 리사이저 (경계선) */
.toss-resizer {
  position: relative;
  width: 8px;
  margin: 0 -4px;
  cursor: col-resize;
  z-index: 25;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
  background: transparent;
}

/* 터치/클릭 감도 확장을 위한 투명 히트 영역 (좌우 14px) */
.toss-resizer::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -5px;
  right: -5px;
  z-index: 1;
}

/* 눈에 보이는 미려한 경계선 */
.toss-resizer .resizer-line {
  width: 1px;
  height: 100%;
  background-color: var(--toss-border);
  transition: background-color 0.15s ease, width 0.15s ease, box-shadow 0.15s ease;
}

.toss-resizer:hover .resizer-line,
.toss-resizer.is-active .resizer-line {
  background-color: var(--toss-blue);
  width: 3px;
  box-shadow: 0 0 10px rgba(49, 130, 246, 0.6);
}

.toss-resizer:focus-visible {
  outline: none;
}
.toss-resizer:focus-visible .resizer-line {
  background-color: var(--toss-blue);
  width: 3px;
}

/* 리사이징 중 전역 상태: 텍스트 드래그 방지 및 iframe 마우스 가로챔 차단 */
body.is-resizing {
  cursor: col-resize !important;
  user-select: none !important;
  -webkit-user-select: none !important;
}

body.is-resizing * {
  cursor: col-resize !important;
  user-select: none !important;
  transition: none !important;
}

body.is-resizing iframe,
body.is-resizing #yt-player {
  pointer-events: none !important;
}

.app-layout.theater-mode .toss-resizer {
  display: none !important;
}

/* 진짜 YouTube 시네마 뷰 (Theater Mode: 화면 가로 100% 블랙 와이드 + 대화 1쌍 슬림 대화창) */

/* 데스크톱 와이드(> 860px): 툴바를 고정 오버레이(fixed)로 분리하여 레이아웃 재계산 및 전체 화면 흔들림(CLS) 차단 */
@media (min-width: 861px) {
  .app-layout.theater-mode .toss-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    margin-top: 0;
    transform: translateY(0);
    transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.3s ease;
    will-change: transform, opacity;
    background-color: var(--toss-surface);
    border-bottom: 1px solid var(--toss-border);
  }

  .app-layout.theater-mode .toss-nav.nav-hidden {
    margin-top: 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
  }

  #video-action-bar-slot:empty,
  .app-layout.theater-mode #video-action-bar-slot {
    display: none !important;
  }
}

/* 비어있지 않은 비디오 액션 바 기본 플렉스 */
#video-action-bar-slot {
  display: flex;
  justify-content: flex-start;
  width: 100%;
}

#video-action-bar-slot:empty {
  display: none !important;
}

/* 모바일 및 협소 화면(<= 860px): 툴바 뭉개짐 방지 및 비디오 하단 알약 컨트롤 센터 배치 */
@media (max-width: 860px) {
  .nav-center {
    display: none !important;
  }

  #video-action-bar-slot {
    display: flex !important;
    justify-content: center;
    width: 100%;
    margin-top: 8px;
  }

  .app-layout.theater-mode .toss-nav {
    position: static;
    transform: none !important;
    opacity: 1 !important;
    pointer-events: auto !important;
  }

  /* 모바일에서 버튼 텍스트 숨김 (아이콘 전용 컴팩트 알약) */
  .player-action-bar .ctrl-btn span:not(.chevron):not(#ctrl-speed-val):not(#ctrl-quality-val) {
    display: none;
  }
  .player-action-bar .ctrl-btn {
    padding: 0 8px;
    min-width: 32px;
  }
  .player-action-bar .ctrl-btn.icon-only {
    padding: 0;
    width: 32px;
    min-width: 32px;
    height: 32px;
    border-radius: 50%;
  }
  .player-action-bar #ctrl-speed-val,
  .player-action-bar #ctrl-quality-val {
    display: inline !important;
    font-size: 11px !important;
  }
  #ctrl-btn-theater {
    display: none !important;
  }
}

.app-layout.theater-mode .toss-main {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  background-color: var(--toss-bg);
  padding-top: 0;
}

.app-layout.theater-mode .toss-main::-webkit-scrollbar {
  display: none;
}

/* 1. 비디오 섹션: 좌우 여백 없는 가로 100% 블랙 와이드 시네마 스테이지 (완전 고정 위치) */
.app-layout.theater-mode .toss-video-section {
  width: 100%;
  max-width: 100%;
  margin: 0;
  padding: 8px 0 4px 0;
  border: none;
  background-color: #000000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  height: auto;
  min-height: 0;
  overflow: visible;
  gap: 0;
}

/* 2. 비디오 카드: 하드코딩 제거! 모든 화면비율과 해상도에서 16:9 정비율 자동 계산 */
.app-layout.theater-mode .video-card {
  width: min(100%, calc((100vh - 270px) * 16 / 9));
  max-width: 1280px;
  aspect-ratio: 16 / 9;
  height: auto;
  max-height: none;
  border-radius: var(--toss-radius-md);
  margin: 0 auto;
  background: #000000;
  overflow: hidden;
  box-shadow: 0 6px 28px rgba(0, 0, 0, 0.6);
  flex-shrink: 0;
  transition: none;
}

.app-layout.theater-mode .video-container {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  border-radius: var(--toss-radius-md);
}

.app-layout.theater-mode .video-container iframe,
.app-layout.theater-mode #yt-player {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
}

/* 3. 비디오 하단 대화창: 대화쌍 1개(질문 1 + 답변 1) 전용 정상화 뷰 */
.app-layout.theater-mode .toss-chat-section {
  width: 100%;
  max-width: 960px;
  margin: 6px auto 10px auto;
  height: auto;
  min-height: 0;
  max-height: 240px;
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-lg);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
  background-color: var(--toss-surface);
}

body.toss-light .app-layout.theater-mode .toss-chat-section {
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.08);
}

/* 시네마 뷰에서는 최근 대화쌍 1개(최근 2개 메시지: 질문+답변)만 노출 */
.app-layout.theater-mode .chat-stream {
  flex: 1 1 auto;
  height: auto;
  max-height: 180px;
  overflow-y: auto;
  padding: 10px 16px 6px 16px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 8px;
}

.app-layout.theater-mode .chat-stream .toss-message {
  display: flex;
  margin-bottom: 0;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.app-layout.theater-mode .chat-stream .toss-message:nth-last-child(n+3) {
  display: none !important;
}

/* 텍스트 크기 정상화 (14.5px, line-height 1.55) */
.app-layout.theater-mode .toss-message .bubble {
  padding: 9px 15px;
  font-size: 14.5px;
  line-height: 1.55;
  border-radius: var(--toss-radius-md);
}

.app-layout.theater-mode .bubble-time {
  display: none !important;
}

/* 채팅 입력창 정상화 (높이 36px, 폰트 14px) */
.app-layout.theater-mode .toss-input-bar {
  padding: 6px 14px;
  background-color: var(--toss-surface);
  border-top: 1px solid var(--toss-border);
  flex-shrink: 0;
}

.app-layout.theater-mode .toss-input-bar .toss-form {
  padding: 3px 6px 3px 14px;
}

.app-layout.theater-mode .toss-input-bar input {
  height: 36px;
  font-size: 14px;
  padding: 0 10px;
}

.app-layout.theater-mode .toss-send-btn {
  width: 32px;
  height: 32px;
}

/* ==========================================================================
   전체화면 모드 (Fullscreen Mode & Overlay Toolbar)
   - 비디오가 100vw x 100vh 화면 전체를 완벽히 채움 (레이아웃 흔들림/재계산 원천 차단)
   - 상단 툴바는 position: fixed 오버레이로 비디오 위에 떠 있어 영상 재생에 영향 없음
   - 마우스 상단 접근 시 48px 센서가 감지하여 부드럽게 슬라이드 다운 (translateY)
   - 1.5초 무조작 시 translateY(-100%)로 스르륵 숨김
   ========================================================================== */

/* 1. 상단 마우스 접근 감지 센서 (툴바 퇴장 시 마우스 상단 접근 포착) */
.fullscreen-top-sensor {
  display: block !important;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 52px;
  z-index: 19;
  pointer-events: auto;
  background: transparent;
}

.app-layout.fullscreen-mode .fullscreen-top-sensor,
.app-layout:fullscreen .fullscreen-top-sensor {
  z-index: 9998;
}

/* 전체화면 모드 시 영화관 모드 버튼 숨김 (영화관-전체화면 중첩 원천 차단) */
.app-layout.fullscreen-mode #ctrl-btn-theater,
.app-layout:fullscreen #ctrl-btn-theater {
  display: none !important;
}

/* 2. 전체화면 오버레이 툴바 */
.app-layout.fullscreen-mode .toss-nav,
.app-layout:fullscreen .toss-nav {
  position: fixed !important;
  top: 0;
  left: 0;
  width: 100vw;
  height: 56px;
  z-index: 9999;
  background-color: rgba(15, 23, 42, 0.92) !important;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12) !important;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
  margin-top: 0 !important;
  transform: translateY(0);
  opacity: 1;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease !important;
  will-change: transform, opacity;
}

/* 전체화면 시 무조작 자동 숨김 상태 */
.app-layout.fullscreen-mode .toss-nav.nav-hidden,
.app-layout:fullscreen .toss-nav.nav-hidden {
  transform: translateY(-100%) !important;
  opacity: 0 !important;
  pointer-events: none !important;
  margin-top: 0 !important;
}

/* 전체화면 툴바 내부 텍스트 및 액션바 대비 확보 */
.app-layout.fullscreen-mode .toss-nav .nav-brand,
.app-layout:fullscreen .toss-nav .nav-brand {
  color: #ffffff !important;
}
.app-layout.fullscreen-mode .toss-nav .hamburger-btn,
.app-layout:fullscreen .toss-nav .hamburger-btn {
  color: rgba(255, 255, 255, 0.85);
}
.app-layout.fullscreen-mode .toss-nav .player-action-bar,
.app-layout:fullscreen .toss-nav .player-action-bar {
  background-color: rgba(30, 41, 59, 0.9) !important;
  border-color: rgba(255, 255, 255, 0.15) !important;
}

/* 3. 전체화면 컨테이너 및 비디오 100vw x 100vh 꽉 채움 (무여백, 무흔들림) */
.app-layout.fullscreen-mode,
.app-layout:fullscreen {
  width: 100vw !important;
  height: 100vh !important;
  background: #000000 !important;
  overflow: hidden !important;
}

.app-layout.fullscreen-mode .toss-main,
.app-layout:fullscreen .toss-main {
  width: 100vw !important;
  height: 100vh !important;
  max-width: 100vw !important;
  max-height: 100vh !important;
  padding: 0 !important;
  margin: 0 !important;
  overflow: hidden !important;
  display: flex !important;
}

.app-layout.fullscreen-mode .toss-video-section,
.app-layout:fullscreen .toss-video-section {
  width: 100vw !important;
  height: 100vh !important;
  max-width: 100vw !important;
  max-height: 100vh !important;
  padding: 0 !important;
  margin: 0 !important;
  overflow: hidden !important;
  flex: 1 1 100% !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  background: #000000 !important;
}

.app-layout.fullscreen-mode .video-card,
.app-layout:fullscreen .video-card,
.video-card:fullscreen,
#player-card:fullscreen {
  width: min(100vw, calc(100vh * 16 / 9)) !important;
  height: min(100vh, calc(100vw * 9 / 16)) !important;
  aspect-ratio: 16 / 9 !important;
  max-width: none !important;
  max-height: none !important;
  border-radius: 0 !important;
  border: none !important;
  box-shadow: none !important;
  margin: auto !important;
  padding: 0 !important;
  background: #000000 !important;
  display: block !important;
  position: relative !important;
}

.app-layout.fullscreen-mode .video-container,
.app-layout:fullscreen .video-container,
.video-card:fullscreen .video-container,
#player-card:fullscreen .video-container {
  width: 100% !important;
  height: 100% !important;
  max-width: none !important;
  max-height: none !important;
  aspect-ratio: 16 / 9 !important;
  border-radius: 0 !important;
  padding-bottom: 0 !important;
  position: relative !important;
}

.app-layout.fullscreen-mode .video-container iframe,
.app-layout:fullscreen .video-container iframe,
.video-card:fullscreen .video-container iframe,
#player-card:fullscreen .video-container iframe {
  position: absolute !important;
  top: 0 !important;
  left: 0 !important;
  width: 100% !important;
  height: 100% !important;
  border-radius: 0 !important;
  border: none !important;
}

/* 4. 전체화면 시 사이드패널 및 리사이저는 비노출 */
.app-layout.fullscreen-mode .toss-chat-section,
.app-layout:fullscreen .toss-chat-section,
.app-layout.fullscreen-mode .toss-resizer,
.app-layout:fullscreen .toss-resizer {
  display: none !important;
}

/* 3. Left Section: Video & Cards (독립 스크롤) */
.toss-video-section {
  display: flex;
  flex-direction: column;
  padding: 16px 20px;
  overflow-y: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  gap: 16px;
  border-right: none;
  min-height: 0;
  min-width: 0;
  height: 100%;
  flex: 1 1 0%;
}

.video-card {
  position: relative;
  width: min(100%, calc((100vh - 120px) * 16 / 9));
  aspect-ratio: 16 / 9;
  height: auto;
  margin: 0 auto;
  flex-shrink: 0;
  border-radius: var(--toss-radius-xl);
  overflow: hidden;
  background-color: #000;
  box-shadow: var(--toss-shadow);
  border: 1px solid var(--toss-border);
}

.video-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000 url('https://img.youtube.com/vi/iSxAE6TVBjg/hqdefault.jpg') center/cover no-repeat;
  overflow: hidden;
}

.video-container iframe,
.video-container #yt-player {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
  z-index: 1;
  pointer-events: auto;
  transform-origin: 0 0;
}

/* ─── 3.1 Player Action Bar (정갈한 컴팩트 컨트롤 센터) ─── */
.player-action-bar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  width: fit-content;
  max-width: 100%;
  align-self: center;
  padding: 6px 12px;
  background-color: var(--toss-card);
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-pill);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.25);
  flex-shrink: 0;
  gap: 6px;
  user-select: none;
  z-index: 10;
}

body.toss-light .player-action-bar {
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.06);
}

.ctrl-group {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.ctrl-sep {
  width: 1px;
  height: 16px;
  background-color: var(--toss-border);
  margin: 0 4px;
  flex-shrink: 0;
}

/* 통일된 컨트롤 버튼 규격 (높이 32px, 폰트 12px, 알약 둥글기) */
.ctrl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 32px;
  padding: 0 10px;
  border-radius: var(--toss-radius-pill);
  background-color: var(--toss-surface);
  border: 1px solid var(--toss-border);
  color: var(--toss-text-main);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.ctrl-btn:hover {
  background-color: var(--toss-card-hover);
  border-color: rgba(255, 255, 255, 0.2);
}

body.toss-light .ctrl-btn:hover {
  border-color: rgba(0, 0, 0, 0.2);
}

.ctrl-btn:active {
  transform: scale(0.94);
}

.ctrl-btn.icon-only {
  width: 32px;
  min-width: 32px;
  height: 32px;
  padding: 0;
  border-radius: 50%;
  justify-content: center;
}

/* ─── 볼륨 컨트롤 (호버 시 음량 슬라이더 펼쳐짐 및 휠 조절) ─── */
.ctrl-volume-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  border-radius: var(--toss-radius-pill);
  overflow: visible;
}

.ctrl-volume-wrap .ctrl-btn.icon-only {
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: 50%;
  flex-shrink: 0;
}

.toss-nav .ctrl-volume-wrap .ctrl-btn.icon-only {
  width: 30px;
  height: 30px;
}

.volume-slider-wrap {
  display: inline-flex;
  align-items: center;
  width: 0;
  max-width: 0;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
  transition: width 0.22s cubic-bezier(0.16, 1, 0.3, 1), max-width 0.22s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.15s ease, margin 0.15s ease;
  margin-left: 0;
  flex-shrink: 0;
}

/* 마우스 호버 시 또는 내부 요소 포커스 시 부드럽게 가로로 슬라이더 펼쳐짐 (2배 확장) */
.ctrl-volume-wrap:hover .volume-slider-wrap,
.ctrl-volume-wrap:focus-within .volume-slider-wrap,
.ctrl-volume-wrap.is-active .volume-slider-wrap {
  width: 132px;
  max-width: 132px;
  opacity: 1;
  pointer-events: auto;
  margin-left: 4px;
  margin-right: 6px;
}

/* 토스 스타일 미니멀 볼륨 바 (폭 2배 확장 120px, 두께 2배 확장 6px -> 12px) */
.toss-volume-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 120px;
  height: 12px;
  border-radius: 6px;
  background: var(--toss-volume-track-empty, rgba(255, 255, 255, 0.22));
  outline: none;
  cursor: pointer;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  border: none;
  transition: none;
}

body.toss-light .toss-volume-slider {
  background: var(--toss-volume-track-empty, rgba(0, 0, 0, 0.14));
}

/* 손잡이(Thumb) 완전 제거 */
.toss-volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 0;
  height: 0;
  border: none;
  opacity: 0;
  background: transparent;
  box-shadow: none;
  cursor: pointer;
}

.toss-volume-slider::-moz-range-thumb {
  width: 0;
  height: 0;
  border: none;
  opacity: 0;
  background: transparent;
  box-shadow: none;
  cursor: pointer;
}

.ctrl-btn.primary {
  background-color: var(--toss-blue);
  border-color: var(--toss-blue);
  color: #ffffff;
  padding: 0 12px;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(49, 130, 246, 0.3);
}

.ctrl-btn.primary:hover {
  background-color: #2b72d8;
  transform: scale(1.03);
}

.ctrl-btn.active {
  background-color: rgba(49, 130, 246, 0.12);
  border-color: var(--toss-blue);
  color: var(--toss-blue);
}

.ctrl-btn.dropdown .chevron {
  color: var(--toss-text-muted);
  transition: transform 0.2s ease;
}

.ctrl-btn.toggle .cc-text {
  font-weight: 800;
  font-size: 11px;
  letter-spacing: 0.02em;
}

/* 드롭다운 메뉴 (위로 열림) */
.ctrl-dropdown-wrap {
  position: relative;
  display: inline-flex;
}

.ctrl-dropdown-menu {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 105px;
  background-color: var(--toss-surface);
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-md);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
  padding: 4px;
  display: none;
  flex-direction: column;
  gap: 2px;
  z-index: 100;
  animation: ctrlDropdownPop 0.12s ease-out;
}

body.toss-light .ctrl-dropdown-menu {
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.12);
}

.ctrl-dropdown-menu.show {
  display: flex;
}

@keyframes ctrlDropdownPop {
  from { opacity: 0; transform: translate(-50%, 4px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

.ctrl-dropdown-menu .dropdown-item {
  padding: 7px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--toss-text-main);
  border-radius: var(--toss-radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.12s ease;
}

.ctrl-dropdown-menu .dropdown-item:hover {
  background-color: var(--toss-card-hover);
}

.ctrl-dropdown-menu .dropdown-item.active {
  color: var(--toss-blue);
  font-weight: 700;
  background-color: rgba(49, 130, 246, 0.1);
}








/* YouTube Video Info & Channel Area Under Player */
.yt-video-details {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 4px;
}

.yt-video-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--toss-text-main);
  margin: 0;
  line-height: 1.35;
}

.yt-channel-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.yt-channel-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.yt-channel-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.3);
}

.yt-channel-meta {
  display: flex;
  flex-direction: column;
}

.yt-channel-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--toss-text-main);
  display: flex;
  align-items: center;
  gap: 4px;
}

.yt-verified-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #94a3b8;
  color: #ffffff;
  font-size: 9px;
  font-weight: 900;
}

.yt-channel-subs {
  font-size: 11px;
  color: var(--toss-text-sub);
}

.yt-btn-subscribe {
  background: var(--toss-text-main);
  color: var(--toss-bg);
  border: none;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.yt-btn-subscribe:hover {
  opacity: 0.9;
}

.yt-action-buttons {
  display: flex;
  align-items: center;
  gap: 6px;
}

.yt-action-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--toss-card);
  border: 1px solid var(--toss-border);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--toss-text-main);
  cursor: pointer;
  transition: background 0.15s ease;
}

.yt-action-btn:hover {
  background: var(--toss-surface);
}

/* Collapsible Description & OKF Anchor Box */
.yt-desc-box {
  background: var(--toss-card);
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-xl);
  padding: 14px 16px;
  font-size: 13px;
}

.desc-stats {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--toss-text-main);
  margin-bottom: 10px;
}

.desc-tag-pill {
  color: #0284c7;
  font-weight: 600;
}

.anchor-now-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 700;
  color: #0284c7;
  margin-bottom: 4px;
}

.anchor-status-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.live-dot {
  width: 7px;
  height: 7px;
  background-color: #ef4444;
  border-radius: 50%;
  box-shadow: 0 0 8px #ef4444;
}

.anchor-meta-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--toss-blue-text);
  letter-spacing: 0.02em;
}

.toss-time-badge {
  margin-left: auto;
  font-family: monospace;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 8px;
  background-color: var(--toss-tag-bg);
  border-radius: 6px;
  color: var(--toss-text-sub);
}

.anchor-main-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--toss-text-main);
  margin-bottom: 8px;
  line-height: 1.35;
}

.toss-tag-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.toss-tag {
  font-size: 12px;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 6px;
  background-color: var(--toss-tag-bg);
  color: var(--toss-text-sub);
}

.toss-tag.highlight {
  background-color: var(--toss-blue-light);
  color: var(--toss-blue-text);
}

.anchor-sub-desc {
  font-size: 13px;
  color: var(--toss-text-sub);
  line-height: 1.5;
}

/* Toss Roadmap Card */
.toss-roadmap-card {
  background-color: var(--toss-surface);
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-xl);
  padding: 16px 20px;
  transition: padding 0.2s ease, border-color 0.2s ease;
}

.roadmap-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  transition: opacity 0.15s ease;
}

.roadmap-header:hover {
  opacity: 0.85;
}

.roadmap-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.roadmap-header h3 {
  font-size: 15px;
  font-weight: 800;
  margin: 0;
}

.roadmap-count {
  font-size: 12px;
  color: var(--toss-text-muted);
  background: var(--toss-card);
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--toss-border);
}

.roadmap-arrow-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--toss-text-muted);
  transition: color 0.15s ease;
}

.roadmap-header:hover .roadmap-arrow-wrap {
  color: var(--toss-text-primary);
}

.roadmap-arrow-icon {
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Collapsed State */
.toss-roadmap-card.collapsed .roadmap-list {
  display: none;
}

.toss-roadmap-card.collapsed .roadmap-arrow-icon {
  transform: rotate(-90deg);
}

.toss-roadmap-card:not(.collapsed) .roadmap-header {
  margin-bottom: 12px;
}

.roadmap-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 220px;
  overflow-y: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding-right: 0;
}

.roadmap-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background-color: var(--toss-card);
  border-radius: var(--toss-radius-md);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--toss-transition);
  border: 1px solid transparent;
}

.roadmap-item:hover {
  background-color: var(--toss-card-hover);
  border-color: var(--toss-border);
}

.roadmap-item.active {
  background-color: var(--toss-blue-light);
  border-color: var(--toss-blue);
  color: var(--toss-blue-text);
  font-weight: 700;
}

.roadmap-item:active {
  transform: scale(0.98);
}

/* 4. Right Section: Toss Messenger Chat */
.toss-chat-section {
  display: flex;
  flex-direction: column;
  background-color: var(--toss-surface);
  height: 100%;
  min-height: 0;
  min-width: 0;
  overflow: hidden;
  position: relative;
  width: var(--chat-panel-width, 420px);
  flex-shrink: 0;
  flex-grow: 0;
}

.chat-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--toss-border);
  flex-shrink: 0;
}

.tutor-profile {
  display: flex;
  align-items: center;
  gap: 12px;
}

.tutor-avatar-ring {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3182f6, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(49, 130, 246, 0.3);
}

.tutor-emoji {
  font-size: 20px;
}

.tutor-title-row {
  display: flex;
  align-items: center;
  gap: 5px;
}

.tutor-name {
  font-size: 15px;
  font-weight: 800;
}

.verified-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 15px;
  height: 15px;
  background-color: var(--toss-blue);
  color: #fff;
  font-size: 10px;
  font-weight: 900;
  border-radius: 50%;
}

.tutor-desc {
  font-size: 12px;
  color: var(--toss-text-sub);
}

.toss-btn-text {
  background: none;
  border: none;
  color: var(--toss-text-muted);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 8px;
  transition: var(--toss-transition);
}

.toss-btn-text:hover {
  color: var(--toss-text-main);
  background-color: var(--toss-card-hover);
}

/* Chat Stream */
.chat-stream {
  flex: 1;
  min-height: 0;
  padding: 16px clamp(12px, 1.5vw, 20px);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.toss-message {
  display: flex;
  flex-direction: column;
  min-width: 0;
  max-width: 92%;
  box-sizing: border-box;
  animation: tossSlideUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes tossSlideUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.toss-message.user {
  align-self: flex-end;
  max-width: 85%;
}

.toss-message.tutor {
  align-self: flex-start;
  max-width: 95%;
}

.bubble {
  min-width: 0;
  max-width: 100%;
  box-sizing: border-box;
  padding: 12px clamp(12px, 1.5vw, 18px);
  border-radius: var(--toss-radius-lg);
  font-size: 14.5px;
  line-height: 1.58;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

.toss-message.user .bubble {
  background-color: var(--toss-bubble-user);
  color: #ffffff;
  border-bottom-right-radius: 4px;
  box-shadow: 0 4px 12px rgba(49, 130, 246, 0.25);
  font-weight: 500;
}

.toss-message.tutor .bubble {
  background-color: var(--toss-bubble-tutor);
  color: var(--toss-text-main);
  border: 1px solid var(--toss-bubble-tutor-border);
  border-bottom-left-radius: 4px;
  box-shadow: var(--toss-shadow);
}

.bubble p {
  margin: 0 0 8px 0;
  line-height: 1.58;
}

.bubble p:last-child {
  margin-bottom: 0;
}

/* Headings in Chat Bubble */
.bubble h1,
.bubble h2,
.bubble h3,
.bubble h4 {
  margin: 14px 0 6px 0;
  font-weight: 700;
  line-height: 1.35;
  color: var(--toss-text-main);
}

.bubble h1:first-child,
.bubble h2:first-child,
.bubble h3:first-child {
  margin-top: 0;
}

.bubble h1 { font-size: 17px; }
.bubble h2 { font-size: 16px; }
.bubble h3 { font-size: 15px; }

/* Dividers in Chat Bubble */
.bubble hr.toss-divider {
  border: none;
  border-top: 1px solid var(--toss-border);
  margin: 14px 0;
  opacity: 0.6;
}

/* Lists in Chat Bubble */
.bubble ul,
.bubble ol {
  margin: 6px 0 8px 0;
  padding-left: 20px;
}

.bubble li {
  margin-bottom: 4px;
  line-height: 1.55;
}

.bubble li:last-child {
  margin-bottom: 0;
}

/* Code Blocks & Inline Code */
.bubble pre {
  background-color: var(--toss-card);
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-md);
  padding: 10px 12px;
  margin: 8px 0;
  overflow-x: auto;
  font-size: 13px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  max-width: 100%;
  box-sizing: border-box;
  scrollbar-width: thin;
}

.bubble code:not(pre code) {
  background-color: rgba(0, 0, 0, 0.06);
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 13px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

body.toss-theme .bubble code:not(pre code) {
  background-color: rgba(255, 255, 255, 0.1);
}

/* Math & Highlight Box inside Tutor Bubble */
.math-card {
  margin: 10px 0;
  padding: 10px 14px;
  background-color: var(--toss-surface);
  border-radius: var(--toss-radius-md);
  border: 1px solid var(--toss-border);
  text-align: center;
  font-size: 14.5px;
  color: var(--toss-blue-text);
  max-width: 100%;
  box-sizing: border-box;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--toss-border) transparent;
}

.math-card .katex-display {
  margin: 0 !important;
  padding: 0 !important;
  border: none !important;
  background: transparent !important;
}

.math-card::-webkit-scrollbar {
  height: 4px;
}

.math-card::-webkit-scrollbar-track {
  background: transparent;
}

.math-card::-webkit-scrollbar-thumb {
  background-color: var(--toss-border);
  border-radius: 4px;
}

/* KaTeX Display Math in Chat Bubble: 수식이 넓어도 화면 밖으로 튀어나가지 않고 내부 가로 스크롤 보장 */
.bubble .katex-display {
  display: block;
  max-width: 100%;
  box-sizing: border-box;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 6px 4px;
  margin: 8px 0;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--toss-border) transparent;
  text-align: center;
}

.bubble .katex-display::-webkit-scrollbar {
  height: 4px;
}

.bubble .katex-display::-webkit-scrollbar-track {
  background: transparent;
}

.bubble .katex-display::-webkit-scrollbar-thumb {
  background-color: var(--toss-border);
  border-radius: 4px;
}

.bubble .katex-display::-webkit-scrollbar-thumb:hover {
  background-color: var(--toss-text-muted);
}

/* KaTeX Inline Math */
.bubble .katex {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  vertical-align: -0.05em;
  text-rendering: auto;
}

.bubble-time {
  font-size: 11px;
  color: var(--toss-text-muted);
  margin-top: 5px;
  padding: 0 4px;
}

.toss-message.user .bubble-time {
  align-self: flex-end;
}

/* 5. Toss Action Pills */
.toss-pills-container {
  padding: 10px 20px;
  background-color: var(--toss-surface);
  border-top: 1px solid var(--toss-border);
  flex-shrink: 0;
}

.pills-scroll {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.pills-scroll::-webkit-scrollbar {
  display: none;
}

.toss-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  background-color: var(--toss-card);
  border: 1px solid var(--toss-border);
  color: var(--toss-text-main);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--toss-radius-pill);
  cursor: pointer;
  transition: var(--toss-transition);
}

.toss-pill:hover {
  background-color: var(--toss-blue-light);
  border-color: var(--toss-blue);
  color: var(--toss-blue-text);
}

.toss-pill:active {
  transform: scale(0.95);
}

/* 6. Toss Input Bar */
.toss-input-bar {
  padding: 12px clamp(12px, 1.5vw, 20px);
  background-color: var(--toss-surface);
  border-top: 1px solid var(--toss-border);
  flex-shrink: 0;
}

.toss-form {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: var(--toss-card);
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-pill);
  padding: 5px 6px 5px clamp(12px, 1.2vw, 18px);
  transition: var(--toss-transition);
}

.toss-form:focus-within {
  border-color: var(--toss-blue);
  box-shadow: 0 0 0 3px var(--toss-blue-light);
}

.toss-form input {
  flex: 1;
  min-width: 0;
  background: none;
  border: none;
  color: var(--toss-text-main);
  font-size: 14px;
  font-weight: 500;
  outline: none;
}

.toss-form input::placeholder {
  color: var(--toss-text-muted);
}

.toss-send-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background-color: var(--toss-blue);
  color: #fff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--toss-transition);
}

.toss-send-btn:hover {
  background-color: var(--toss-blue-hover);
}

.toss-send-btn:active {
  transform: scale(0.92);
}

/* 7. Toss Bottom Sheet Modal */
.toss-modal-backdrop {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 0.2s ease;
}

.toss-modal-backdrop.hidden {
  display: none;
}

.toss-modal-sheet {
  background-color: var(--toss-surface);
  border-top-left-radius: var(--toss-radius-xl);
  border-top-right-radius: var(--toss-radius-xl);
  padding: 24px 28px 36px;
  width: 100%;
  max-width: 520px;
  box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.4);
  animation: sheetUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes sheetUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

.modal-handle {
  width: 40px;
  height: 4px;
  background-color: var(--toss-border);
  border-radius: 2px;
  margin: 0 auto 16px;
}

/* Clean Top Navigation & Minimal Hamburger */
.hamburger-btn {
  background: transparent;
  border: none;
  outline: none;
  box-shadow: none;
  color: var(--toss-text-main);
  width: 36px;
  height: 36px;
  border-radius: var(--toss-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* 색깔 반전(Color Inversion)으로 직관적 피드백 */
.hamburger-btn:hover,
.hamburger-btn:focus-visible,
.hamburger-btn.active {
  background-color: var(--toss-text-main);
  color: var(--toss-bg);
}

.hamburger-btn:active {
  transform: scale(0.94);
}

.nav-brand {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--toss-text-main);
}

/* ─── Nav Roadmap Button & Dropdown Popover ─── */
.nav-roadmap-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  margin-left: 0;
}

.nav-roadmap-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 32px;
  padding: 0 8px;
  border-radius: var(--toss-radius-pill);
  background-color: var(--toss-card);
  border: 1px solid var(--toss-border);
  color: var(--toss-text-main);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.nav-roadmap-btn:hover {
  background-color: var(--toss-card-hover);
  border-color: rgba(255, 255, 255, 0.2);
}

body.toss-light .nav-roadmap-btn:hover {
  border-color: rgba(0, 0, 0, 0.2);
}

.nav-roadmap-btn.active {
  background-color: var(--toss-surface);
  border-color: var(--toss-blue);
  color: var(--toss-blue);
}

.roadmap-btn-icon {
  color: var(--toss-text-sub);
  flex-shrink: 0;
  transition: color 0.15s ease;
}

.nav-roadmap-btn.active .roadmap-btn-icon {
  color: var(--toss-blue);
}

.roadmap-btn-label {
  font-size: 12.5px;
  letter-spacing: -0.01em;
}

.roadmap-btn-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 999px;
  background-color: var(--toss-surface);
  border: 1px solid var(--toss-border);
  color: var(--toss-text-sub);
  line-height: 1.3;
}

.roadmap-btn-chevron {
  color: var(--toss-text-sub);
  flex-shrink: 0;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), color 0.15s ease;
}

.nav-roadmap-btn.active .roadmap-btn-chevron {
  transform: rotate(180deg);
  color: var(--toss-blue);
}

/* Nav Roadmap Dropdown Popover */
.nav-roadmap-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  width: 320px;
  max-height: 420px;
  background-color: var(--toss-surface);
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-lg);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
  z-index: 1000;
  display: none;
  flex-direction: column;
  overflow: hidden;
  animation: roadmapDropdownFade 0.15s cubic-bezier(0.16, 1, 0.3, 1);
}

body.toss-light .nav-roadmap-dropdown {
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.12);
}

.nav-roadmap-dropdown.show {
  display: flex;
}

@keyframes roadmapDropdownFade {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.roadmap-dropdown-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--toss-border);
  background-color: var(--toss-surface);
  flex-shrink: 0;
}

.dropdown-title {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--toss-text-main);
  letter-spacing: -0.01em;
}

.dropdown-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--toss-text-sub);
  background: var(--toss-card);
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--toss-border);
}

.nav-roadmap-dropdown .roadmap-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
  overflow-y: auto;
  max-height: 350px;
}

.nav-roadmap-dropdown .roadmap-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 12px;
  border-radius: var(--toss-radius-md);
  font-size: 12.5px;
  color: var(--toss-text-main);
  cursor: pointer;
  transition: background-color 0.12s ease;
  user-select: none;
}

.nav-roadmap-dropdown .roadmap-item:hover {
  background-color: var(--toss-card-hover);
}

.nav-roadmap-dropdown .roadmap-item.active {
  background-color: rgba(49, 130, 246, 0.12);
  color: var(--toss-blue);
  font-weight: 700;
}

.nav-roadmap-dropdown .roadmap-item.active .toss-time-badge {
  background-color: var(--toss-blue);
  color: #fff;
  border-color: var(--toss-blue);
}

/* Standard Settings Drawer & Backdrop */
.settings-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.settings-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.settings-drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: 360px;
  max-width: 85vw;
  height: 100vh;
  background-color: var(--toss-surface);
  border-right: 1px solid var(--toss-border);
  box-shadow: 10px 0 30px rgba(0, 0, 0, 0.4);
  z-index: 1001;
  transform: translateX(-100%);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.settings-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--toss-border);
}

.drawer-user-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 3px;
}

.drawer-user-greet {
  font-size: 15px;
  font-weight: 700;
  color: var(--toss-text-main);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 3px;
}

.drawer-user-id {
  color: var(--toss-blue);
  font-weight: 800;
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.drawer-logout-btn {
  background: transparent;
  border: none;
  font-size: 12px;
  font-weight: 500;
  color: var(--toss-text-muted);
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.15s ease;
}

.drawer-logout-btn:hover {
  color: #f04452;
}

.drawer-logout-btn.login-mode {
  color: var(--toss-blue);
  font-weight: 600;
}

.drawer-logout-btn.login-mode:hover {
  color: #2b72d8;
}

.drawer-close-btn {
  background: transparent;
  border: none;
  color: var(--toss-text-sub);
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.drawer-close-btn:hover {
  color: var(--toss-text-main);
  background-color: var(--toss-card);
}

/* Drawer Body: 세로 목록화 (Vertical List of Independent Cards) */
.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px 20px 28px 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* 접이식 아코디언 탭 (누르면 하위로 확장) */
.setting-accordion-item {
  background-color: var(--toss-card);
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-lg);
  overflow: visible;
  position: relative;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.setting-accordion-item:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

body.toss-light .setting-accordion-item:hover {
  border-color: rgba(0, 0, 0, 0.15);
}

/* 모든 탭 헤더의 높이, 패딩, 박스 모델을 100% 동일하게 통일 */
.setting-tab-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
  padding: 0 16px;
  user-select: none;
  box-sizing: border-box;
  border-radius: calc(var(--toss-radius-lg) - 1px);
}

/* 펼쳐진 아코디언의 헤더는 상단만 둥글고 하단은 패널과 매끄럽게 연결 */
.setting-accordion-item.expanded .setting-tab-header {
  border-radius: calc(var(--toss-radius-lg) - 1px) calc(var(--toss-radius-lg) - 1px) 0 0;
}

.setting-tab-header.clickable,
#header-theme {
  cursor: pointer;
  transition: background-color 0.15s ease;
  border-radius: calc(var(--toss-radius-lg) - 1px);
}

.setting-tab-header.clickable:hover,
#header-theme:hover {
  background-color: var(--toss-card-hover);
}

.tab-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--toss-text-main);
}

.tab-icon {
  color: var(--toss-text-sub);
  flex-shrink: 0;
}

.tab-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--toss-text-main);
  letter-spacing: -0.01em;
}

/* 우측 뱃지 + 액션 컨트롤 영역 규격 통일 */
.tab-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ─── 세팅 드로어 ? 툴팁 안내 컴포넌트 ─── */
.setting-tooltip-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.setting-tooltip-trigger {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background-color: var(--toss-surface);
  border: 1px solid var(--toss-border);
  color: var(--toss-text-muted);
  font-size: 12px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  box-sizing: border-box;
  transition: all 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  outline: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.setting-tooltip-trigger:hover,
.setting-tooltip-trigger:focus-visible,
.setting-tooltip-wrap.is-open .setting-tooltip-trigger {
  background-color: var(--toss-blue);
  border-color: var(--toss-blue);
  color: #ffffff;
  transform: scale(1.06);
  box-shadow: 0 2px 8px rgba(49, 130, 246, 0.35);
}

.setting-accordion-item:has(.setting-tooltip-wrap:hover),
.setting-accordion-item:has(.setting-tooltip-wrap.is-open) {
  z-index: 100;
}

.setting-tooltip-bubble {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: max-content;
  max-width: 220px;
  padding: 8px 12px;
  background-color: rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.38);
  color: #ffffff;
  font-size: 11.5px;
  line-height: 1.45;
  font-weight: 500;
  word-break: keep-all;
  white-space: normal;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.18s cubic-bezier(0.16, 1, 0.3, 1), transform 0.18s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.18s;
  z-index: 9999;
}

.setting-tooltip-bubble::before {
  content: "";
  position: absolute;
  top: -4px;
  right: 9px;
  width: 7px;
  height: 7px;
  background-color: rgba(15, 23, 42, 0.96);
  border-left: 1px solid rgba(255, 255, 255, 0.14);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  transform: rotate(45deg);
}

body.toss-light .setting-tooltip-bubble {
  background-color: rgba(30, 41, 59, 0.96);
  border-color: rgba(0, 0, 0, 0.1);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

body.toss-light .setting-tooltip-bubble::before {
  background-color: rgba(30, 41, 59, 0.96);
  border-left-color: rgba(0, 0, 0, 0.1);
  border-top-color: rgba(0, 0, 0, 0.1);
}

/* 호버 시 또는 클래스 활성화 시 노출 */
.setting-tooltip-wrap:hover .setting-tooltip-bubble,
.setting-tooltip-wrap:focus-within .setting-tooltip-bubble,
.setting-tooltip-wrap.is-open .setting-tooltip-bubble {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

/* 클릭 가능한 뱃지 인터랙션 */
.status-badge.clickable-badge {
  cursor: pointer;
  transition: all 0.15s ease;
}

.status-badge.clickable-badge:hover {
  border-color: var(--toss-blue);
  color: var(--toss-blue);
  background-color: rgba(49, 130, 246, 0.08);
}

/* 하위 확장 패널 */
.setting-sub-panel {
  display: none;
  flex-direction: column;
  gap: 12px;
  padding: 14px 16px 16px 16px;
  border-top: 1px solid var(--toss-border);
  border-radius: 0 0 var(--toss-radius-lg) var(--toss-radius-lg);
  background-color: rgba(0, 0, 0, 0.08);
  animation: expandSubPanel 0.18s ease-out;
}

body.toss-light .setting-sub-panel {
  background-color: rgba(0, 0, 0, 0.02);
}

.setting-accordion-item.expanded .setting-sub-panel {
  display: flex;
}

@keyframes expandSubPanel {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.setting-desc {
  font-size: 12px;
  color: var(--toss-text-sub);
  line-height: 1.5;
  margin: 0;
}



/* Status Badge 규격 통일 (높이 22px, 폰트 11px) */
.status-badge {
  font-size: 11px;
  font-weight: 600;
  height: 22px;
  line-height: 20px;
  padding: 0 8px;
  border-radius: 999px;
  background-color: var(--toss-surface);
  border: 1px solid var(--toss-border);
  color: var(--toss-text-sub);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  white-space: nowrap;
}

.status-badge.active,
.status-badge.success {
  color: #00c063;
  border-color: rgba(0, 192, 99, 0.3);
  background-color: rgba(0, 192, 99, 0.08);
}

/* 화면 테마 뱃지: 다크모드/라이트모드 모두 선명한 초록색 유지 */
#theme-status-badge {
  color: #00c063 !important;
  border-color: rgba(0, 192, 99, 0.35) !important;
  background-color: rgba(0, 192, 99, 0.12) !important;
  font-weight: 700;
}

#theme-status-badge:hover {
  background-color: rgba(0, 192, 99, 0.2) !important;
  border-color: #00c063 !important;
}


/* Drawer Inputs & Buttons */
.drawer-input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 4px;
}

.drawer-input {
  width: 100%;
  padding: 10px 14px;
  font-size: 13px;
  background-color: var(--toss-card);
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-md);
  color: var(--toss-text-main);
  outline: none;
  transition: border-color 0.15s ease;
}

.drawer-input:focus {
  border-color: var(--toss-blue);
}

.drawer-btn-row {
  display: flex;
  gap: 8px;
}

.drawer-btn {
  padding: 9px 16px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--toss-radius-md);
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.drawer-btn.primary {
  background-color: var(--toss-blue);
  color: #ffffff;
}

.drawer-btn.primary:hover {
  background-color: #2b72d8;
}

.drawer-btn.secondary {
  background-color: var(--toss-card);
  border-color: var(--toss-border);
  color: var(--toss-text-sub);
}

.drawer-btn.secondary:hover {
  color: #f04452;
  border-color: rgba(240, 68, 82, 0.4);
}

.drawer-btn.outline {
  background-color: transparent;
  border-color: var(--toss-border);
  color: var(--toss-text-main);
}

.drawer-btn.outline:hover {
  background-color: var(--toss-card);
  border-color: var(--toss-text-sub);
}

.drawer-btn.full {
  width: 100%;
}

.drawer-status-box {
  background-color: var(--toss-card);
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-md);
  padding: 12px 14px;
  font-size: 12px;
  color: var(--toss-text-sub);
  line-height: 1.6;
  white-space: pre-wrap;
}

.drawer-status-box.hidden {
  display: none !important;
}

/* API Key Manager Module */
.api-key-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2px;
}

.api-key-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--toss-text-sub);
}

.api-key-count {
  font-size: 11px;
  font-weight: 700;
  color: var(--toss-blue-text);
  background-color: var(--toss-blue-light);
  padding: 2px 7px;
  border-radius: 6px;
}

.api-key-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 200px;
  overflow-y: auto;
}

.api-key-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background-color: var(--toss-card);
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-md);
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.api-key-card:hover {
  border-color: rgba(49, 130, 246, 0.4);
}

.api-key-card.is-active {
  border-color: var(--toss-blue);
  background-color: rgba(49, 130, 246, 0.06);
}

body.toss-light .api-key-card.is-active {
  background-color: rgba(49, 130, 246, 0.08);
}

.api-key-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  flex: 1;
  min-width: 0;
}

.api-key-status-indicator {
  width: 18px;
  height: 18px;
  border-radius: 5px;
  border: 1.5px solid var(--toss-border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.15s ease;
  color: transparent;
}

.api-key-status-indicator.active {
  border-color: var(--toss-blue);
  background-color: var(--toss-blue);
  color: #ffffff;
}

.api-key-text-wrap {
  display: flex;
  flex-direction: column;
  min-width: 0;
  flex: 1;
}

.api-key-masked-val {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  font-weight: 600;
  color: var(--toss-text-main);
  letter-spacing: 0.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.api-key-date {
  font-size: 11px;
  color: var(--toss-text-muted);
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.api-key-date .active-label {
  color: var(--toss-blue-text);
  font-weight: 600;
}

.api-key-date .inactive-label {
  color: var(--toss-text-muted);
}

.api-key-delete-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--toss-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  flex-shrink: 0;
  margin-left: 6px;
}

.api-key-delete-btn:hover {
  color: #f04452;
  background-color: rgba(240, 68, 82, 0.12);
}

.api-key-empty {
  padding: 16px 12px;
  text-align: center;
  border: 1px dashed var(--toss-border);
  border-radius: var(--toss-radius-md);
  color: var(--toss-text-muted);
  font-size: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background-color: rgba(0, 0, 0, 0.02);
}

.api-key-empty svg {
  color: var(--toss-text-muted);
  opacity: 0.7;
}

.api-key-add-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 4px;
}

.api-key-add-row {
  display: flex;
  gap: 8px;
}

.api-key-input {
  flex: 1;
  min-width: 0;
}

.api-key-add-btn {
  width: 68px;
  flex-shrink: 0;
}

/* Marathon Model Setup Component */
.marathon-setup-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 6px;
  padding-top: 10px;
  border-top: 1px solid var(--toss-border);
}

.marathon-model-setup-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.marathon-prov-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.marathon-prov-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--toss-text-muted);
  letter-spacing: 0.2px;
}

.marathon-chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.marathon-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 9px;
  border-radius: var(--toss-radius-pill);
  font-family: inherit;
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--toss-border);
  background-color: var(--toss-card);
  color: var(--toss-text-muted);
  transition: all 0.15s ease;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.marathon-chip:hover {
  background-color: var(--toss-card-hover);
  border-color: var(--toss-border-strong);
}

.marathon-chip.active {
  border-color: var(--toss-blue);
  background-color: rgba(49, 130, 246, 0.08);
  color: var(--toss-blue);
}

.marathon-chip-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  border: 1px solid var(--toss-border);
  color: transparent;
  flex-shrink: 0;
  transition: all 0.12s ease;
}

.marathon-chip.active .marathon-chip-check {
  background-color: var(--toss-blue);
  border-color: var(--toss-blue);
  color: #ffffff;
}

.marathon-empty-tip {
  font-size: 12px;
  color: var(--toss-text-muted);
  padding: 8px 0;
}

/* ─── Top Nav Model Selector (미니멀 토스 스타일 팝오버) ─── */
.nav-model-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-model-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 12px;
  border-radius: var(--toss-radius-pill);
  background-color: var(--toss-card);
  border: 1px solid var(--toss-border);
  color: var(--toss-text-main);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.nav-model-btn:hover {
  background-color: var(--toss-card-hover);
  border-color: var(--toss-border-strong);
}

.nav-model-btn.active,
.nav-model-btn:focus-visible {
  outline: none;
  border-color: var(--toss-blue);
  background-color: var(--toss-card);
  box-shadow: 0 0 0 3px var(--toss-blue-light);
}

.nav-model-icon {
  color: var(--toss-blue);
  flex-shrink: 0;
  transition: color 0.15s ease;
}

.nav-model-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--toss-text-main);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav-model-chevron {
  color: var(--toss-text-sub);
  flex-shrink: 0;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), color 0.15s ease;
}

.nav-model-btn.active .nav-model-chevron {
  transform: rotate(180deg);
  color: var(--toss-blue);
}

/* Nav Model Dropdown Popover */
.nav-model-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 230px;
  max-height: 400px;
  background-color: var(--toss-surface);
  border: 1px solid var(--toss-border);
  border-radius: var(--toss-radius-lg);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
  z-index: 1000;
  display: none;
  flex-direction: column;
  overflow-y: auto;
  padding: 6px;
  animation: modelDropdownFade 0.15s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

body.toss-light .nav-model-dropdown {
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.12);
}

.nav-model-dropdown.show {
  display: flex;
}

@keyframes modelDropdownFade {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.model-dropdown-group {
  display: flex;
  flex-direction: column;
  padding: 2px 0;
}

.model-dropdown-group:not(:last-child) {
  border-bottom: 1px solid var(--toss-border);
  margin-bottom: 4px;
  padding-bottom: 4px;
}

.model-group-header {
  font-size: 11px;
  font-weight: 700;
  color: var(--toss-text-muted);
  padding: 6px 10px 4px 10px;
  letter-spacing: 0.2px;
}

.model-dropdown-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: var(--toss-radius-sm);
  color: var(--toss-text-main);
  font-size: 12.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.12s ease;
  user-select: none;
}

.model-dropdown-item:hover {
  background-color: var(--toss-card-hover);
}

/* 선택된 모델 항목: 파란색으로 명확하고 직관적인 강조 */
.model-dropdown-item.selected {
  color: var(--toss-blue) !important;
  font-weight: 700 !important;
  background-color: rgba(49, 130, 246, 0.08) !important;
}

body.toss-light .model-dropdown-item.selected {
  background-color: rgba(49, 130, 246, 0.08) !important;
}

.model-item-check {
  width: 14px;
  height: 14px;
  color: var(--toss-blue);
  flex-shrink: 0;
  display: none;
}

.model-dropdown-item.selected .model-item-check {
  display: block;
}

.model-dropdown-empty {
  padding: 14px 10px;
  font-size: 12px;
  color: var(--toss-text-muted);
  text-align: center;
  line-height: 1.5;
}

/* OAuth Quick Connect Buttons (공식 로고 전용 & 파란색/회색 반투명 음영 오버레이) */
.oauth-section-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--toss-border);
}

.oauth-btn-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.oauth-connect-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 46px;
  border-radius: var(--toss-radius-md);
  border: 1px solid var(--toss-border);
  background-color: rgba(140, 145, 155, 0.08);
  color: var(--toss-text-subtle);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  /* 미연결 기본 상태: 회색 반투명 음영 오버레이로 비활성/미연결 직관적 인지 */
  opacity: 0.38;
  filter: grayscale(100%);
}

.oauth-connect-btn:hover {
  opacity: 0.75;
  border-color: var(--toss-blue);
  background-color: var(--toss-card-hover);
}

/* 연결된 상태: 선명한 파란색 표기 */
.oauth-connect-btn.connected {
  opacity: 1 !important;
  filter: none !important;
  border-color: var(--toss-blue) !important;
  background-color: rgba(49, 130, 246, 0.1) !important;
  color: var(--toss-blue) !important;
  box-shadow: 0 2px 8px rgba(49, 130, 246, 0.22);
}

body.toss-light .oauth-connect-btn.connected {
  background-color: rgba(49, 130, 246, 0.08) !important;
}

.oauth-connect-btn.connected:hover {
  background-color: rgba(49, 130, 246, 0.16) !important;
  box-shadow: 0 4px 12px rgba(49, 130, 246, 0.28);
}

/* 헬스체크 실패 / 토큰 만료 상태: 선명한 빨간색 표기 (재인증 필요) */
.oauth-connect-btn.expired {
  opacity: 1 !important;
  filter: none !important;
  border-color: #f04452 !important; /* 토스 레드 */
  background-color: rgba(240, 68, 82, 0.1) !important;
  color: #f04452 !important;
  box-shadow: 0 2px 8px rgba(240, 68, 82, 0.22);
}

body.toss-light .oauth-connect-btn.expired {
  background-color: rgba(240, 68, 82, 0.08) !important;
}

.oauth-connect-btn.expired:hover {
  background-color: rgba(240, 68, 82, 0.16) !important;
  box-shadow: 0 4px 12px rgba(240, 68, 82, 0.28);
}

.oauth-logo-svg {
  display: block;
  transition: transform 0.15s ease;
}

.oauth-connect-btn:active .oauth-logo-svg {
  transform: scale(0.92);
}

/* Responsive: 860px 이하 태블릿 및 모바일 세로 분할 대응 */
@media (max-width: 860px) {
  .toss-main {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 56px);
    overflow: hidden;
  }
  .toss-resizer {
    display: none !important;
  }
  .toss-video-section {
    flex-shrink: 0;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--toss-border);
    padding: 8px 12px 6px 12px;
    gap: 6px;
    overflow: visible;
  }
  .toss-video-section .video-card {
    width: 100%;
    max-height: 38vh;
  }
  #video-action-bar-slot {
    width: 100%;
    display: flex;
    justify-content: center;
    margin-top: 2px;
  }
  .player-action-bar {
    max-width: 100%;
    overflow: visible;
    justify-content: center;
    padding: 4px 6px;
    gap: 5px;
  }
  .toss-roadmap-card {
    display: none;
  }
  .toss-chat-section {
    width: 100% !important;
    flex: 1;
    min-height: 0;
    height: auto;
  }
  .chat-stream {
    padding: 12px 16px;
  }
  .toss-input-bar {
    padding: 10px 14px;
  }
}

/* ─── Screen Reader Only Utility ─── */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* ─── Toss Global Tooltip System ([data-tooltip]) ─── */
[data-tooltip] {
  position: relative;
}

@media (hover: hover) and (pointer: fine) {
  /* 툴팁 말풍선 본체 (상단 바 버튼들이므로 기본 아래 방향으로 노출) */
  [data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    top: calc(100% + 7px);
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
    background: rgba(18, 22, 31, 0.94);
    color: #f1f3f5;
    font-size: 11px;
    font-weight: 500;
    font-family: var(--font-toss);
    padding: 5px 9px;
    border-radius: 6px;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.15s cubic-bezier(0.16, 1, 0.3, 1), transform 0.15s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.12);
    z-index: 99999;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    letter-spacing: -0.01em;
    line-height: 1.35;
  }

  /* 툴팁 꼬리표 (화살표) */
  [data-tooltip]::before {
    content: "";
    position: absolute;
    top: calc(100% + 2px);
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
    border-width: 0 5px 5px 5px;
    border-style: solid;
    border-color: transparent transparent rgba(18, 22, 31, 0.94) transparent;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.15s cubic-bezier(0.16, 1, 0.3, 1), transform 0.15s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 99999;
  }

  /* 호버 시 부드럽게 노출 */
  [data-tooltip]:hover::after,
  [data-tooltip]:hover::before {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
  }

  /* 라이트 모드 스타일 최적화 */
  body.toss-light [data-tooltip]::after {
    background: rgba(26, 32, 44, 0.95);
    color: #ffffff;
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.22);
  }

  body.toss-light [data-tooltip]::before {
    border-color: transparent transparent rgba(26, 32, 44, 0.95) transparent;
  }

  /* 드롭다운 메뉴가 열려있을 때 툴팁 숨김 */
  .ctrl-dropdown-wrap:focus-within > [data-tooltip]::after,
  .ctrl-dropdown-wrap:focus-within > [data-tooltip]::before,
  .nav-roadmap-wrapper:focus-within > [data-tooltip]::after,
  .nav-roadmap-wrapper:focus-within > [data-tooltip]::before {
    display: none !important;
  }
}