/* 
  To Teach, To Lead: NTNU Exhibition
  Global Stylesheet - Premium Museum Edition
*/

:root {
  --bg-primary: oklch(92.5% 0.015 85);    /* Traditional Paper Cream */
  --bg-secondary: oklch(97% 0.01 85);  /* Light Mist White */
  --accent-blue: oklch(48% 0.14 275);   /* Scholar Blue/Purple */
  --accent-gold: oklch(72% 0.11 82);    /* Burnished Gold */
  --accent-gold-light: oklch(72% 0.11 82 / 20%);
  --text-main: oklch(25% 0.01 85);      /* Charcoal Ink */
  --text-muted: oklch(25% 0.01 85 / 60%);
  --footer-bg: oklch(25% 0.01 85);
  --footer-text: oklch(95% 0.01 85);
  
  --font-zh: "Noto Serif TC", serif;
  --font-en: "Cormorant Garamond", serif;
  --font-body: "Noto Serif TC", serif;

  /* Type ramp (~1.25); rem-based for zoom/accessibility */
  --type-xs: 0.8rem;
  --type-caption: 0.875rem;
  --type-sm: 0.925rem;
  --type-label: 1rem;
  --type-nav: 1.0625rem;
  --type-body: 1.1875rem;
  --type-lead: 1.2rem;
  --type-menu: 1.5rem;
  --line-body: 1.75;
  --line-tight: 1.22;
  --line-display: 1.05;

  /* Spacing scale (4px base, museum-tight rhythm) */
  --space-1: 0.25rem;   /* 4 */
  --space-2: 0.5rem;    /* 8 */
  --space-3: 0.75rem;   /* 12 */
  --space-4: 1rem;      /* 16 */
  --space-5: 1.25rem;   /* 20 */
  --space-6: 1.5rem;    /* 24 */
  --space-7: 2rem;      /* 32 */
  --space-8: 2.5rem;    /* 40 */
  --space-9: 3rem;      /* 48 */
  --space-10: 3.75rem;  /* 60 */
  --space-11: 5rem;     /* 80 */
  --space-12: 6.25rem;  /* 100 */
  --space-13: 7.5rem;   /* 120 */

  /* Wide bands (nav, hero, footer): room to breathe on large viewports */
  --container-inline: clamp(var(--space-6), 4.5vw, var(--space-11));
  /* Narrow reading column: same gutters as wide on phones; calmer on tablet+ */
  --container-inline-narrow: var(--container-inline);
  --section-block: clamp(var(--space-11), 11vw, var(--space-13));
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);

  --transition-smooth: all 0.6s var(--ease-out-expo);
  --shadow-premium: 0 20px 40px rgba(44, 42, 36, 0.08);

  /* Lightbox: longest edge up to 1600px, still fits viewport */
  --lightbox-max-long: 1600px;
}

@media (max-width: 767px) {
  :root {
    --container-inline: clamp(var(--space-7), 5vw, var(--space-10));
    --container-inline-narrow: clamp(var(--space-7), 5vw, var(--space-10));
  }
}

@media (min-width: 768px) {
  :root {
    --container-inline-narrow: clamp(var(--space-5), 2.5vw, var(--space-7));
  }
}

/* Base Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 100%;
  text-size-adjust: 100%;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: var(--type-body);
  line-height: var(--line-body);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--accent-gold);
  border-radius: 10px;
}

/* Global Texture Overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.12; 
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 250 250' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* Image Background (ntnu104_pic-03.png) */
body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  opacity: 0.08; /* Very subtle so it doesn't distract from text */
  background: url("../images/ntnu104_pic-03.png") no-repeat center center;
  background-size: cover;
  mix-blend-mode: multiply;
}

/* Image Logos & Decors */
.footer-logo-img {
  height: 64px;
  width: auto;
  margin: 0 auto;
  display: block;
  opacity: 0.85;
}

.decor-icon {
  width: auto;
  height: 1.2em; /* Scales with text */
  opacity: 0.8;
  display: inline-block;
  vertical-align: middle;
  margin-right: var(--space-3);
  margin-bottom: 4px;
}

/* Typography */
h1, h2, h3, .heading-zh {
  font-family: var(--font-zh);
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: var(--line-tight);
}

.heading-en {
  font-family: var(--font-en);
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding-left: max(var(--container-inline), env(safe-area-inset-left, 0px));
  padding-right: max(var(--container-inline), env(safe-area-inset-right, 0px));
}

/* Navbar with Glassmorphism */
.navbar {
  background-color: oklch(from var(--bg-secondary) l c h / 82%);
  backdrop-filter: blur(12px) saturate(110%);
  -webkit-backdrop-filter: blur(12px) saturate(110%);
  border-bottom: 1px solid var(--accent-gold-light);
  padding-top: max(var(--space-6), env(safe-area-inset-top, 0px));
  padding-bottom: var(--space-6);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition-smooth);
}

.navbar.scrolled {
  padding-top: max(var(--space-4), env(safe-area-inset-top, 0px));
  padding-bottom: var(--space-4);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.navbar__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding-left: max(var(--container-inline), env(safe-area-inset-left, 0px));
  padding-right: max(var(--container-inline), env(safe-area-inset-right, 0px));
}

.nav-logo {
  font-family: var(--font-zh);
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--text-main);
  letter-spacing: 0.04em;
}

@media (max-width: 767px) {
  .nav-logo {
    font-size: clamp(0.82rem, 2.8vw, 1.05rem);
    letter-spacing: 0.06em;
    max-width: min(14rem, 58vw);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
}

.nav-links {
  display: none;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: var(--space-3) var(--space-5);
  }
  .nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-size: var(--type-nav);
    font-weight: 500;
    line-height: 1.35;
    transition: color 0.3s;
    position: relative;
  }
  .nav-links a::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--accent-blue);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s var(--ease-out-expo);
  }
  .nav-links a:hover::after {
    transform: scaleX(1);
  }
  .nav-links a:hover {
    color: var(--accent-blue);
  }
  .nav-links a.is-current {
    color: var(--accent-blue);
  }
}

@media (min-width: 768px) and (max-width: 1100px) {
  .nav-links a {
    font-size: 0.9375rem;
  }
}

/* Hero Section */
.hero {
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding: clamp(var(--space-8), 6vh, var(--space-11)) 0;
  position: relative;
}

.hero-layout {
  display: flex;
  flex-direction: column;
  gap: clamp(var(--space-8), 5vw, var(--space-10));
}

.hero-content {
  z-index: 10;
}

.hero-title {
  font-size: clamp(3rem, 10vw, 5.5rem);
  line-height: var(--line-display);
  margin-bottom: var(--space-7);
  letter-spacing: -0.02em;
}

.hero-title-zh {
  display: block;
  margin-bottom: var(--space-2);
}

.hero-title-en {
  display: block;
  font-size: 0.58em;
}

.hero-title-tag {
  display: block;
  margin-top: var(--space-2);
  font-size: 0.22em;
  font-style: normal;
  letter-spacing: 0.05em;
  opacity: 0.82;
  font-weight: 400;
}

.hero-subtitle {
  font-size: clamp(1.15rem, 2.4vw, 1.55rem);
  margin-bottom: var(--space-8);
  max-width: 42ch;
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--accent-gold-light);
}

.hero-details {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-3) var(--space-5);
  margin-bottom: var(--space-8);
  font-size: clamp(1rem, 1.45vw, 1.125rem);
  color: var(--text-main);
  align-items: baseline;
}

.detail-label {
  font-weight: 700;
  color: var(--accent-blue);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.detail-value {
  opacity: 0.9;
  letter-spacing: 0.02em;
}

.hero-intro {
  margin-bottom: var(--space-6);
  padding-left: var(--space-5);
  border-left: 2px solid var(--accent-gold);
  max-width: 54ch;
}

.hero-intro-title {
  font-family: var(--font-zh);
  font-size: var(--type-lead);
  color: var(--accent-blue);
  margin-bottom: var(--space-3);
  font-weight: 700;
  letter-spacing: 0.1em;
}

.hero-intro p {
  font-size: clamp(1rem, 1.85vw, 1.125rem);
  line-height: var(--line-body);
  color: var(--text-main);
  opacity: 0.85;
  text-align: justify;
  text-justify: inter-character;
  text-align-last: start;
}



.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5) var(--space-6);
  align-items: center;
}

.hero-organizer {
  margin-top: clamp(var(--space-7), 8vh, var(--space-9));
  font-size: var(--type-sm);
  letter-spacing: 0.05em;
  opacity: 0.62;
}



/* Poster Frame */
.hero-poster {
  width: 100%;
  max-width: 480px;
}

.poster-frame {
  background: white;
  padding: var(--space-4);
  box-shadow: var(--shadow-premium);
  border: 1px solid var(--accent-gold-light);
  position: relative;
  transition: transform 0.75s var(--ease-out-expo);
}

.poster-frame::before {
  content: "";
  position: absolute;
  top: 8px; left: 8px; right: 8px; bottom: 8px;
  border: 1px solid var(--accent-gold-light);
  pointer-events: none;
}

.poster-frame:hover {
  transform: translateY(-10px) rotate(1deg);
}

.poster-img {
  width: 100%;
  height: auto;
  display: block;
}

@media (min-width: 992px) {
  .hero-layout {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .hero-content {
    flex: 1;
    max-width: 600px;
  }
  .hero-poster {
    flex: 0 0 42%;
  }
}


/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: var(--space-4) var(--space-9);
  text-decoration: none;
  font-weight: 700;
  transition: color 0.35s var(--ease-out-expo), background-color 0.35s var(--ease-out-expo),
    border-color 0.35s var(--ease-out-expo), box-shadow 0.35s var(--ease-out-expo),
    transform 0.35s var(--ease-out-expo);
  cursor: pointer;
  border: none;
  font-family: var(--font-zh);
  letter-spacing: 0.05em;
  font-size: var(--type-label);
}

.btn-primary {
  background-color: var(--accent-blue);
  color: white;
}

.btn-secondary {
  border: 1.5px solid var(--accent-blue);
  color: var(--accent-blue);
  background: transparent;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(91, 92, 168, 0.2);
}

.btn-primary:hover {
  background-color: #4a4b8f;
}

/* Chapter Cards */
.chapter-grid {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .chapter-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .chapter-grid { grid-template-columns: repeat(3, 1fr); }
}

.chapter-card {
  background: rgba(255, 255, 255, 0.5);
  padding: clamp(var(--space-9), 4vw, var(--space-10)) clamp(var(--space-7), 3vw, var(--space-9));
  border: 1px solid var(--accent-gold-light);
  transition: background-color 0.45s var(--ease-out-expo), transform 0.45s var(--ease-out-expo),
    box-shadow 0.45s var(--ease-out-expo);
  text-decoration: none;
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.chapter-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--space-7);
  right: var(--space-7);
  height: 2px;
  background: var(--accent-gold);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.45s var(--ease-out-expo);
}

.chapter-card:hover {
  background: white;
  transform: translateY(-6px);
  box-shadow: var(--shadow-premium);
}

.chapter-card:hover::before {
  transform: scaleX(1);
}

.chapter-number {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 2.5rem;
  color: var(--accent-gold);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: var(--space-5);
}

/* Section Decor */
section {
  padding: var(--section-block) 0;
}

/* Reading-width main sections (chapters, about, visit). Exhibition index has .chapter-grid → stays full .container width. */
main > section.container:where(:has(.chapter-body), :has(.about-block), :has(.visit-stack)) {
  max-width: 1000px;
  padding-block: clamp(var(--space-9), 7vw, var(--space-11));
  padding-left: max(var(--container-inline-narrow), env(safe-area-inset-left, 0px));
  padding-right: max(var(--container-inline-narrow), env(safe-area-inset-right, 0px));
}

section.alternate {
  background-color: var(--bg-secondary);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: clamp(var(--space-9), 6vw, var(--space-10));
  text-align: center;
  position: relative;
}

.section-title::after {
  content: "";
  display: block;
  width: 60px;
  height: 2px;
  background: var(--accent-gold);
  margin: var(--space-6) auto 0;
}

/* Image Placeholders */
.img-placeholder {
  background-color: #e5e0d4;
  width: 100%;
  aspect-ratio: 3/2;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--accent-gold-light);
}

.img-placeholder::after {
  content: "IMAGE ARCHIVE";
  font-size: var(--type-caption);
  color: var(--accent-gold);
  letter-spacing: 0.1em;
  font-weight: 700;
}

.img-caption {
  font-size: var(--type-sm);
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
  margin-bottom: var(--space-8);
}

.img-placeholder--map {
  background-color: #fff;
}

.img-placeholder--map::after {
  content: none;
}

.img-placeholder--ratio-16-9 {
  aspect-ratio: 16 / 9;
}

.img-placeholder--ratio-4-5 {
  aspect-ratio: 4 / 5;
}

.img-placeholder--ratio-21-9 {
  aspect-ratio: 21 / 9;
}

.img-placeholder--static {
  cursor: default;
}

.img-placeholder:not(.img-placeholder--static) {
  cursor: pointer;
}

/* 多張單圖+圖說：雙欄縮圖網格（手機單欄），避免一張佔滿整行過大 */
.archive-thumb-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(var(--space-6), 3.5vw, var(--space-8));
  margin-bottom: var(--space-8);
  align-items: start;
}

@media (min-width: 640px) {
  .archive-thumb-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 僅一張時：置中、限寬，避免單圖仍佔滿整欄過大 */
.archive-thumb-grid:has(> :only-child) {
  grid-template-columns: 1fr;
  max-width: min(100%, 38rem);
  margin-inline: auto;
}

.archive-thumb {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin: 0;
}

.archive-thumb .img-placeholder {
  margin-bottom: 0;
}

.archive-thumb .img-caption {
  margin-bottom: 0;
  text-align: center;
}

.img-placeholder--archive {
  aspect-ratio: 4 / 3;
}

.img-placeholder:has(> img)::after {
  content: none;
}

.img-placeholder > img {
  width: 100%;
  height: 100%;
  object-fit: contain; /* 保證圖片完整顯示不裁切 */
  padding: var(--space-4); /* 增加留白，製造相框質感 */
  display: block;
}

/* —— Inner pages: about / visit / exhibition / chapters —— */
.page-stack {
  display: grid;
  gap: clamp(var(--space-10), 6vw, var(--space-12));
}

.about-block {
  margin-bottom: clamp(var(--space-11), 9vw, var(--space-12));
}

.about-block:last-child {
  margin-bottom: 0;
}

.content-heading {
  font-size: clamp(1.35rem, 2.5vw, 1.8rem);
  margin-bottom: var(--space-6);
  color: var(--accent-blue);
}

.content-heading--center {
  text-align: center;
  margin-bottom: var(--space-8);
}

.prose-justify {
  font-size: var(--type-lead);
  text-align: left;
  hyphens: auto;
  margin-bottom: var(--space-8);
  max-width: 75ch;
  overflow-wrap: break-word;
}

.image-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-7);
}

@media (max-width: 640px) {
  .image-grid-2 {
    grid-template-columns: 1fr;
  }
}

.timeline-wrap {
  border-top: 1px solid var(--accent-gold);
  padding-top: clamp(var(--space-9), 5vw, var(--space-10));
  position: relative;
}

.timeline-scroll {
  display: flex;
  gap: var(--space-7);
  overflow-x: auto;
  padding-bottom: var(--space-6);
  padding-inline-start: 0;
  padding-inline-end: max(var(--space-2), env(safe-area-inset-right, 0px));
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.timeline-item {
  flex: 0 0 min(12.5rem, 72vw);
  scroll-snap-align: start;
  padding-top: var(--space-4);
  border-top: 2px solid var(--accent-gold-light);
  transition: border-color 0.35s var(--ease-out-expo);
}

.timeline-item:hover {
  border-top-color: var(--accent-gold);
}

.timeline-year {
  font-family: var(--font-en);
  font-weight: 700;
  color: var(--accent-gold);
  font-size: 1.5rem;
  line-height: 1;
}

.timeline-title {
  font-weight: 700;
  margin: var(--space-3) 0 var(--space-2);
}

.timeline-desc {
  font-size: var(--type-sm);
  opacity: 0.72;
  line-height: 1.55;
}

/* Visit */
.visit-stack {
  display: grid;
  gap: clamp(var(--space-10), 5vw, var(--space-11));
}

.visit-section {
  border-bottom: 1px solid var(--accent-gold-light);
  padding-bottom: var(--space-9);
}

.visit-section:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.visit-section__title {
  color: var(--accent-blue);
  margin-bottom: var(--space-6);
  font-size: clamp(1.25rem, 2.2vw, 1.5rem);
}

.info-stack {
  display: grid;
  gap: var(--space-4);
  font-size: var(--type-body);
}

.visit-subhead {
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.visit-list {
  margin: 0;
  padding-left: 1.25rem;
  display: grid;
  gap: var(--space-2);
}

.visit-prose {
  margin: 0 0 0 1.25rem;
  line-height: 1.65;
  max-width: 62ch;
}

.visit-columns {
  display: grid;
  gap: var(--space-6);
}

/* Exhibition index */
.chapter-page-subtitle {
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  opacity: 0.72;
  text-align: center;
  margin-top: calc(-1 * var(--space-8));
  margin-bottom: clamp(var(--space-9), 5vw, var(--space-10));
}

.chapter-card__title {
  margin-bottom: var(--space-3);
  font-size: 1.4rem;
}

.chapter-card__en {
  margin-bottom: var(--space-5);
  font-size: var(--type-sm);
  color: var(--accent-blue);
}

.chapter-card__text {
  font-size: var(--type-label);
  opacity: 0.82;
  line-height: 1.6;
}

.chapter-grid > .chapter-card.fade-in:nth-child(2) { transition-delay: 0.08s; }
.chapter-grid > .chapter-card.fade-in:nth-child(3) { transition-delay: 0.16s; }
.chapter-grid > .chapter-card.fade-in:nth-child(4) { transition-delay: 0.24s; }
.chapter-grid > .chapter-card.fade-in:nth-child(5) { transition-delay: 0.32s; }

/* Chapter article: title block ↔ body */
.chapter-header:has(.chapter-title-page) {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: clamp(var(--space-9), 6vw, var(--space-11));
  padding-bottom: var(--space-7);
  border-bottom: 1px solid var(--accent-gold-light);
}

.chapter-header:has(.chapter-title-page) .chapter-number {
  margin-bottom: 0;
}

.chapter-header:has(.chapter-title-page) .chapter-title-page {
  margin-top: 0;
}

.chapter-title-page {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-top: var(--space-3);
}

.chapter-header .heading-en {
  font-size: var(--type-lead);
  opacity: 0.72;
}

.chapter-body {
  margin-top: 0;
  margin-bottom: var(--space-9);
}

.prose-lead {
  font-size: var(--type-lead);
  border-bottom: 1px solid var(--accent-gold);
  padding-bottom: var(--space-8);
  margin-bottom: var(--space-9);
  max-width: 75ch;
}

.prose-block {
  margin-bottom: var(--space-7);
  width: 100%;
  text-align: justify;
  text-justify: inter-character;
  text-align-last: start;
  overflow-wrap: break-word;
}

.chapter-subheading {
  font-size: 1.5rem;
  margin-bottom: var(--space-5);
  color: var(--accent-blue);
}

.media-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

.media-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  align-items: start;
}

.media-grid-3:has(.archive-thumb) {
  margin-bottom: var(--space-8);
}

.media-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2);
}

@media (max-width: 1024px) {
  .media-grid-4 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }
}

@media (max-width: 640px) {
  .media-grid-2,
  .media-grid-3,
  .media-grid-4 {
    grid-template-columns: 1fr;
  }
}

.chapter-pager {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-5);
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--accent-gold);
}

.chapter-pager a {
  text-decoration: none;
  color: var(--accent-blue);
  font-weight: 700;
}

.chapter-pager a:hover {
  text-decoration: underline;
}

.chapter-pager__placeholder {
  visibility: hidden;
  pointer-events: none;
  user-select: none;
}

.quote-box {
  margin: var(--space-10) 0;
  padding: var(--space-8) var(--space-7);
  background: var(--bg-secondary);
  border: 1px solid var(--accent-gold-light);
  position: relative;
}

.quote-icon {
  font-family: var(--font-en);
  font-size: 3rem;
  line-height: 0.85;
  color: var(--accent-gold);
  opacity: 0.35;
  display: block;
  margin-bottom: var(--space-4);
}

.quote-text {
  font-size: var(--type-lead);
  font-style: italic;
  margin-bottom: var(--space-5);
  line-height: 1.75;
  max-width: 75ch;
}

.quote-attrib {
  font-weight: 700;
}

.law-box {
  margin: var(--space-9) 0;
  padding: var(--space-6) var(--space-7);
  background: rgba(91, 92, 168, 0.06);
  border: 1px solid rgba(91, 92, 168, 0.22);
}

.law-box__title {
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.law-box__body {
  font-size: var(--type-label);
  line-height: 1.75;
}

/* Lightbox (chapter pages) */
#lightbox {
  --lightbox-pad: var(--space-6);
  --lightbox-max-w: min(
    var(--lightbox-max-long),
    calc(100vw - 2 * var(--lightbox-pad))
  );
  --lightbox-max-h: min(
    var(--lightbox-max-long),
    calc(100dvh - 2 * var(--lightbox-pad)),
    calc(100vh - 2 * var(--lightbox-pad))
  );
  position: fixed;
  inset: 0;
  z-index: 12000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(44, 42, 36, 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s var(--ease-out-expo);
  padding: var(--lightbox-pad);
}

#lightbox.active {
  opacity: 1;
  pointer-events: auto;
}

#lightbox > .lightbox-placeholder {
  width: min(90vw, var(--lightbox-max-w));
  height: min(70dvh, var(--lightbox-max-h));
  max-width: var(--lightbox-max-w);
  max-height: var(--lightbox-max-h);
  background-color: #e5e0d4;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-zh);
  color: var(--text-muted);
  font-size: var(--type-sm);
  border-radius: 2px;
  border: 1px solid var(--accent-gold-light);
  box-shadow: var(--shadow-premium);
}

#lightbox > img {
  display: block;
  width: auto;
  height: auto;
  max-width: var(--lightbox-max-w);
  max-height: var(--lightbox-max-h);
  object-fit: contain;
  border-radius: 2px;
  border: 1px solid var(--accent-gold-light);
  box-shadow: var(--shadow-premium);
}

/* Custom Cursor */
.custom-cursor {
  width: 20px;
  height: 20px;
  border: 1px solid var(--accent-gold);
  border-radius: 50%;
  position: fixed;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 10000;
  transform: translate(var(--cursor-x, -100px), var(--cursor-y, -100px));
  transition: transform 0.15s var(--ease-out-expo), opacity 0.3s;
  opacity: 0;
}

.custom-cursor.active {
  transform: translate(var(--cursor-x, -100px), var(--cursor-y, -100px)) scale(2.5);
  background: rgba(212, 163, 86, 0.1);
  border-color: transparent;
}

@media (hover: none) {
  .custom-cursor { display: none; }

  .mobile-nav a:active,
  .chapter-pager a:active {
    opacity: 0.72;
  }

  .nav-logo:active {
    opacity: 0.75;
  }
}

/* Mobile Menu Toggle */
.menu-toggle {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1100;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--text-main);
  transition: var(--transition-smooth);
}

@media (min-width: 768px) {
  .menu-toggle { display: none; }
}

/* Mobile nav: panel starts below sticky navbar so X toggle stays visible */
:root {
  --mobile-nav-top: calc(env(safe-area-inset-top, 0px) + 4.25rem);
}

body.mobile-nav-open {
  overflow: hidden;
}

body.mobile-nav-open .navbar {
  z-index: 1200;
}

body.mobile-nav-open .menu-toggle {
  z-index: 1201;
}

body.mobile-nav-open:has(.navbar.scrolled) {
  --mobile-nav-top: calc(env(safe-area-inset-top, 0px) + 3.5rem);
}

.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1040;
  margin: 0;
  padding: 0;
  border: none;
  cursor: pointer;
  background: rgba(44, 42, 36, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s var(--ease-out-expo);
}

.mobile-nav-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

/* Mobile Nav Overlay */
.mobile-nav {
  position: fixed;
  top: 0;
  right: -100%;
  width: min(18rem, 85vw);
  height: 100vh;
  height: 100dvh;
  background: var(--bg-secondary);
  z-index: 1050;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
  gap: var(--space-2);
  padding: max(var(--space-9), env(safe-area-inset-top, 0px))
    max(var(--space-5), env(safe-area-inset-right, 0px))
    max(var(--space-6), env(safe-area-inset-bottom, 0px))
    max(var(--space-5), env(safe-area-inset-left, 0px));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  transition: right 0.45s var(--ease-out-expo);
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.12);
  visibility: hidden;
}

.mobile-nav.active {
  top: var(--mobile-nav-top);
  height: calc(100dvh - var(--mobile-nav-top));
  height: calc(100vh - var(--mobile-nav-top));
  right: 0;
  visibility: visible;
}

.mobile-nav a {
  font-family: var(--font-zh);
  font-size: var(--type-nav);
  line-height: 1.45;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 600;
  min-height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--accent-gold-light);
  text-align: left;
  white-space: normal;
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.mobile-nav a.is-current {
  color: var(--accent-blue);
}

.menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Footer */
footer {
  background-color: var(--footer-bg);
  color: var(--footer-text);
  padding: clamp(var(--space-9), 10vw, var(--space-12)) 0;
  margin-top: auto;
}

.footer-logo {
  font-family: var(--font-zh);
  font-weight: 700;
  font-size: 1.4rem;
  margin-bottom: var(--space-5);
  letter-spacing: 0.05em;
}

.footer-rule {
  width: 40px;
  height: 1px;
  background: var(--accent-gold);
  margin: var(--space-5) auto var(--space-6);
}

.footer-copy {
  font-size: var(--type-xs);
  opacity: 0.5;
  letter-spacing: 0.05em;
  max-width: 52ch;
  margin: 0 auto;
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.85s var(--ease-out-expo), transform 0.85s var(--ease-out-expo);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .poster-frame {
    transition: none;
  }
  .poster-frame:hover {
    transform: none;
  }
  .btn {
    transition: none;
  }
  .btn:hover {
    transform: none;
  }
  .chapter-card {
    transition: none;
  }
  .chapter-card:hover {
    transform: none;
  }
  .chapter-card::before {
    transition: none;
  }
  .navbar {
    transition: none;
  }
  .mobile-nav {
    transition: none;
  }
  #lightbox {
    transition: none;
  }
}

/* Responsive & adapt (touch, narrow, landscape) */
@media (max-width: 900px) and (orientation: landscape) {
  .hero {
    min-height: unset;
    padding-block: var(--space-8);
  }

  .hero-organizer {
    margin-top: var(--space-8);
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: clamp(2.25rem, 11vw, 3.5rem);
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
    text-align: center;
  }

  .chapter-card {
    padding: var(--space-9) var(--space-7);
  }

  .chapter-header:has(.chapter-title-page) {
    margin-bottom: clamp(var(--space-8), 5vw, var(--space-10));
    padding-bottom: var(--space-6);
  }

  .quote-box {
    padding: var(--space-7) var(--space-5);
  }
}

@media (max-width: 520px) {
  .chapter-pager {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
  }

  .chapter-pager a {
    min-height: 2.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4) var(--space-3);
    text-align: center;
  }

  .chapter-pager__placeholder {
    display: none;
  }
}


.nav-logo:focus-visible,
.nav-links a:focus-visible,
.btn:focus-visible,
.mobile-nav a:focus-visible,
.menu-toggle:focus-visible,
.chapter-pager a:focus-visible,
.chapter-card:focus-visible,
#lightbox:focus-visible,
.back-to-top:focus-visible {
  outline: 2px solid var(--accent-gold);
  outline-offset: 3px;
}

/* -- Micro Interactions & Reveal Animations -- */

/* 1. Staggered Scroll Reveal */
.reveal-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.85s var(--ease-out-expo), transform 0.85s var(--ease-out-expo);
}

.reveal-item.reveal-active {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal-item {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* 2. Image Hover Zoom */
.img-placeholder > img {
  transition: transform 0.8s var(--ease-out-expo);
}
.img-placeholder:hover > img {
  transform: scale(1.05);
}

/* 3. Quote Box Animation */
.quote-box {
  transition: transform 0.4s var(--ease-out-expo), box-shadow 0.4s var(--ease-out-expo);
}
.quote-icon {
  transition: color 0.4s var(--ease-out-expo), transform 0.4s var(--ease-out-expo);
  display: inline-block;
}
.quote-box:hover {
  transform: translateY(-2px);
}
.quote-box:hover .quote-icon {
  color: var(--accent-blue);
  transform: translateY(-4px);
}

/* 4. Subheading Underline Draw */
.chapter-subheading {
  position: relative;
  padding-bottom: var(--space-4);
}
.chapter-subheading::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--accent-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.8s var(--ease-out-expo) 0.2s; /* Slight delay after reveal */
}
.chapter-subheading.reveal-active::after {
  transform: scaleX(1);
}

/* 5. Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: clamp(var(--space-6), 4vw, var(--space-8));
  right: clamp(var(--space-6), 4vw, var(--space-8));
  width: 3.2rem;
  height: 3.2rem;
  background-color: var(--accent-blue);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 25px rgba(91, 92, 168, 0.3);
  cursor: pointer;
  z-index: 990;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity 0.4s var(--ease-out-expo), transform 0.4s var(--ease-out-expo), visibility 0.4s, background-color 0.3s, box-shadow 0.3s;
  border: none;
}
.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background-color: #4a4b8f;
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(91, 92, 168, 0.4);
}
.back-to-top svg {
  width: 1.5rem;
  height: 1.5rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* 6. Contained Hero Banner Layout for Landscape Image */
.hero-section {
  padding-top: clamp(var(--space-6), 5vw, var(--space-9));
}

.hero-banner {
  width: 100%;
  max-width: 960px; /* 將圖片最大寬度縮小，避免在電腦上顯得過於龐大 */
  margin: 0 auto; /* 保持置中 */
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 15px 35px rgba(44, 42, 36, 0.08);
  border: 1px solid var(--accent-gold-light);
  background-color: transparent;
}

.hero-img-full {
  width: 100%;
  height: auto;
  display: block;
}

.hero-text-section {
  padding-block: clamp(var(--space-8), 6vw, var(--space-11));
  max-width: 960px; /* 讓下方的文字網格與圖片邊緣完美切齊 */
  margin: 0 auto;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr; /* 左右兩欄等寬 */
    gap: var(--space-8);
    align-items: start;
  }
  .hero-grid-right {
    padding-top: 0; /* 取消原本為了對齊標題而下的 padding，讓左右兩欄對齊頂部 */
  }
}

/* Nav Logo specific styling */
.nav-logo-img {
  height: clamp(48px, 6vw, 64px); /* 加大 Logo 尺寸 */
  width: auto;
  display: block;
}

/* Expanded Footer Info */
.footer-info {
  text-align: center;
  color: var(--footer-text);
  opacity: 0.85;
  font-size: clamp(0.9rem, 1.2vw, 1rem);
  line-height: 1.8;
}

.footer-info a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 163, 86, 0.4);
  transition: all 0.3s ease;
}

.footer-info a:hover {
  color: var(--accent-gold);
  border-bottom-color: var(--accent-gold);
}

.footer-bottom {
  margin-top: var(--space-4);
  text-align: center;
  color: var(--footer-text);
  opacity: 0.6;
  font-size: 0.85rem;
  line-height: 1.6;
}

.browser-hint {
  margin-top: var(--space-1);
}

/* 7. Location Banner (Visit Page) */
.location-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5) var(--space-6);
  background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(248, 245, 238, 0.4) 100%);
  border: 1px solid var(--accent-gold-light);
  border-radius: 6px;
  margin-bottom: var(--space-10);
  box-shadow: 0 8px 25px rgba(212, 163, 86, 0.08);
}

.location-icon {
  width: 24px;
  height: 24px;
  fill: var(--accent-gold);
  margin-right: var(--space-3);
  flex-shrink: 0;
}

.location-text {
  font-family: var(--font-zh);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-main);
  font-weight: 500;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.location-text .divider {
  color: var(--accent-gold);
  margin: 0 var(--space-3);
  opacity: 0.5;
}

@media (max-width: 768px) {
  .location-banner {
    flex-direction: column;
    text-align: center;
    padding: var(--space-4);
  }
  .location-icon {
    margin-right: 0;
    margin-bottom: var(--space-2);
  }
  .location-text {
    flex-direction: column;
  }
  .location-text .divider {
    display: none;
  }
  .location-text .address {
    margin-top: var(--space-1);
    font-size: 0.9em;
    color: rgba(44, 42, 36, 0.8);
  }
}