/* ============================================================
   Theme System — CSS Custom Properties
   ============================================================ */

/* ── Default Theme: Dark Cinematic Romance (暗色电影感) ──── */
:root {
  /* Surface */
  --bg-primary: #0d0a0b;
  --bg-secondary: #1a1215;
  --bg-card: rgba(30, 18, 22, 0.55);
  --bg-card-hover: rgba(35, 20, 25, 0.65);
  --bg-lightbox: rgba(8, 5, 6, 0.94);

  /* Text */
  --text-primary: #ede0d8;
  --text-secondary: #b8a0a0;
  --text-heading: #f0e6e0;
  --text-muted: #a08888;

  /* Accent */
  --accent: #c4556b;
  --accent-soft: #d4788a;
  --accent-light: #e8a0b0;
  --accent-pale: #f0c4ce;
  --gold: #c8963e;
  --gold-light: #d4a85c;

  /* Border & Shadow */
  --border-subtle: rgba(200, 150, 150, 0.18);
  --border-divider: rgba(200, 150, 150, 0.14);
  --shadow-card: 0 8px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 60px rgba(196, 85, 107, 0.15), 0 0 120px rgba(196, 85, 107, 0.06);
  --shadow-photo-hover: 0 12px 40px rgba(196, 85, 107, 0.25);
  --shadow-lightbox: 0 20px 80px rgba(0, 0, 0, 0.6);

  /* Card */
  --card-radius: 20px;
  --card-glass-blur: 24px;
  --card-border: 1px solid var(--border-subtle);

  /* Photo */
  --photo-radius: 10px;
  --photo-brightness: 0.9;
  --photo-saturate: 0.95;
  --photo-hover-brightness: 1.05;
  --photo-hover-saturate: 1.1;
  --photo-bg: var(--bg-card);
  --photo-overlay: linear-gradient(to top, rgba(13, 10, 11, 0.3) 0%, transparent 40%);

  /* Typography */
  --font-display: 'Georgia', 'STSong', 'Noto Serif SC', serif;
  --font-zh: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'STSong', serif;
  --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-size-h1: clamp(1.5rem, 3vw, 2rem);
  --font-size-h1-minimal: clamp(2.2rem, 5vw, 3.8rem);
  --font-size-en: clamp(1rem, 2vw, 1.25rem);
  --font-size-en-minimal: clamp(1.1rem, 2.2vw, 1.4rem);
  --font-size-subtitle-zh: 0.95rem;
  --font-size-subtitle-en: 0.85rem;
  --font-size-section-zh: clamp(1.6rem, 3.5vw, 2.2rem);
  --font-size-section-en: clamp(0.95rem, 1.8vw, 1.1rem);

  /* Spacing */
  --hero-padding: 2rem;
  --card-padding: 3rem 2.5rem;
  --photo-gap: 1.2rem;
  --section-padding: 4rem 2rem 6rem;

  /* Grain overlay */
  --grain-opacity: 0.04;
  --grain-display: block;

  /* Canvas hearts */
  --hearts-display: block;

  /* Divider */
  --divider-color: var(--border-subtle);

  /* Scrollbar */
  --scrollbar-thumb: var(--accent);
  --scrollbar-track: var(--bg-primary);

  /* Lightbox nav buttons */
  --lightbox-nav-bg: rgba(255, 255, 255, 0.04);
  --lightbox-nav-border: rgba(255, 255, 255, 0.08);
  --lightbox-nav-hover-bg: rgba(196, 85, 107, 0.2);
  --lightbox-nav-hover-border: var(--accent);
  --lightbox-close-hover-bg: rgba(255, 255, 255, 0.08);
}

/* ── Theme: Minimalist Editorial (极简杂志风) ────────── */
[data-theme="minimal"] {
  --bg-primary: #fafaf8;
  --bg-secondary: #f3f1ee;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --bg-lightbox: rgba(250, 250, 248, 0.97);

  --text-primary: #1a1a1a;
  --text-secondary: #5c5c5c;
  --text-heading: #111111;
  --text-muted: #999999;

  --accent: #b8444a;
  --accent-soft: #c96060;
  --accent-light: #d48080;
  --accent-pale: #e8b0b0;
  --gold: #8b6b4a;
  --gold-light: #a08060;

  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-divider: rgba(0, 0, 0, 0.06);
  --shadow-card: 0 2px 20px rgba(0, 0, 0, 0.06);
  --shadow-glow: none;
  --shadow-photo-hover: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-lightbox: 0 20px 80px rgba(0, 0, 0, 0.2);

  --card-radius: 2px;
  --card-glass-blur: 0px;
  --card-border: none;

  --photo-radius: 0px;
  --photo-brightness: 1;
  --photo-saturate: 0;
  --photo-hover-brightness: 1;
  --photo-hover-saturate: 1;
  --photo-bg: transparent;
  --photo-overlay: none;

  --grain-opacity: 0;
  --grain-display: none;

  --hearts-display: none;

  --divider-color: rgba(0, 0, 0, 0.12);

  --scrollbar-thumb: #ccc;
  --scrollbar-track: #fafaf8;

  --lightbox-nav-bg: rgba(0, 0, 0, 0.03);
  --lightbox-nav-border: rgba(0, 0, 0, 0.08);
  --lightbox-nav-hover-bg: rgba(184, 68, 74, 0.1);
  --lightbox-nav-hover-border: var(--accent);
  --lightbox-close-hover-bg: rgba(0, 0, 0, 0.04);

  --card-padding: 4rem 2.5rem 3rem;
  --photo-gap: 1.5rem;
  --hero-padding: 3rem;
}

/* ── Theme: Vintage Film Memory (复古胶片记忆) ───── */
[data-theme="vintage"] {
  --bg-primary: #f5efe4;
  --bg-secondary: #ede4d3;
  --bg-card: rgba(255, 250, 242, 0.9);
  --bg-card-hover: rgba(255, 252, 247, 0.95);
  --bg-lightbox: rgba(40, 30, 20, 0.95);

  --text-primary: #3d2e1f;
  --text-secondary: #6b5a45;
  --text-heading: #2c1f12;
  --text-muted: #9b8b78;

  --accent: #c47a38;
  --accent-soft: #d49450;
  --accent-light: #e0b080;
  --accent-pale: #edd5b8;
  --gold: #b8863c;
  --gold-light: #c99a50;

  --border-subtle: rgba(60, 40, 20, 0.12);
  --border-divider: rgba(60, 40, 20, 0.08);
  --shadow-card: 0 4px 24px rgba(60, 30, 10, 0.12);
  --shadow-glow: none;
  --shadow-photo-hover: 0 8px 28px rgba(60, 30, 10, 0.2);
  --shadow-lightbox: 0 20px 80px rgba(0, 0, 0, 0.5);

  --card-radius: 4px;
  --card-glass-blur: 0px;
  --card-border: 1px solid rgba(60, 40, 20, 0.1);

  --photo-radius: 0px;
  --photo-brightness: 0.95;
  --photo-saturate: 0.7;
  --photo-hover-brightness: 1.05;
  --photo-hover-saturate: 1;
  --photo-bg: #faf6f0;
  --photo-overlay: none;

  --grain-opacity: 0.06;
  --grain-display: block;

  --hearts-display: none;

  --divider-color: rgba(60, 40, 20, 0.15);

  --scrollbar-thumb: #c9b896;
  --scrollbar-track: #f5efe4;

  --lightbox-nav-bg: rgba(255, 255, 255, 0.08);
  --lightbox-nav-border: rgba(255, 255, 255, 0.12);
  --lightbox-nav-hover-bg: rgba(200, 160, 100, 0.2);
  --lightbox-nav-hover-border: var(--accent);
  --lightbox-close-hover-bg: rgba(255, 255, 255, 0.08);

  --card-padding: 2.5rem 2.5rem 2rem;
  --photo-gap: 1.5rem;
  --hero-padding: 2rem;

  --font-size-h1: clamp(1.4rem, 2.8vw, 1.8rem);
  --font-size-en: clamp(0.95rem, 1.8vw, 1.15rem);
}

/* ── Theme: Starry Night (星空之夜) ──────────────── */
[data-theme="starry"] {
  --bg-primary: #070b1a;
  --bg-secondary: #0d1330;
  --bg-card: rgba(15, 20, 50, 0.5);
  --bg-card-hover: rgba(20, 28, 60, 0.6);
  --bg-lightbox: rgba(5, 8, 20, 0.95);

  --text-primary: #d8dfee;
  --text-secondary: #8a94b8;
  --text-heading: #e8ecf8;
  --text-muted: #606a90;

  --accent: #7b9ed4;
  --accent-soft: #96b5e0;
  --accent-light: #b8cff0;
  --accent-pale: #d4e2f8;
  --gold: #e8c551;
  --gold-light: #f0d870;

  --border-subtle: rgba(120, 150, 200, 0.15);
  --border-divider: rgba(120, 150, 200, 0.1);
  --shadow-card: 0 4px 30px rgba(20, 40, 100, 0.3);
  --shadow-glow: 0 0 80px rgba(100, 140, 220, 0.1), 0 0 160px rgba(100, 140, 220, 0.04);
  --shadow-photo-hover: 0 8px 36px rgba(120, 160, 220, 0.3);
  --shadow-lightbox: 0 20px 80px rgba(0, 0, 30, 0.6);

  --card-radius: 16px;
  --card-glass-blur: 20px;
  --card-border: 1px solid rgba(120, 150, 200, 0.12);

  --photo-radius: 8px;
  --photo-brightness: 0.85;
  --photo-saturate: 0.9;
  --photo-hover-brightness: 1.08;
  --photo-hover-saturate: 1.05;
  --photo-bg: var(--bg-card);
  --photo-overlay: linear-gradient(to top, rgba(7, 11, 26, 0.25) 0%, transparent 50%);

  --grain-opacity: 0.02;
  --grain-display: block;

  --hearts-display: block;

  --divider-color: rgba(120, 150, 200, 0.12);

  --scrollbar-thumb: #3a4a78;
  --scrollbar-track: #070b1a;

  --lightbox-nav-bg: rgba(255, 255, 255, 0.04);
  --lightbox-nav-border: rgba(255, 255, 255, 0.08);
  --lightbox-nav-hover-bg: rgba(120, 150, 220, 0.2);
  --lightbox-nav-hover-border: var(--accent);
  --lightbox-close-hover-bg: rgba(255, 255, 255, 0.06);

  --card-padding: 3rem 2.5rem;
  --photo-gap: 1rem;
  --hero-padding: 2rem;

  --font-size-h1: clamp(1.5rem, 3vw, 2rem);
  --font-size-en: clamp(1rem, 2vw, 1.25rem);
}

/* ============================================================
   Reset & Base
   ============================================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

html::-webkit-scrollbar {
  display: none;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  transition: background 0.5s ease, color 0.5s ease;
}

/* ============================================================
   Grain Texture Overlay (dark theme only)
   ============================================================ */
.grain-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  opacity: var(--grain-opacity);
  display: var(--grain-display);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ============================================================
   Canvas Hearts Overlay
   ============================================================ */
#hearts-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  display: var(--hearts-display);
}

/* ============================================================
   Theme Toggle — hidden in footer
   ============================================================ */
.footer-theme {
  position: relative;
  display: flex;
  justify-content: center;
  margin-top: 2rem;
}

.footer-theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: 50%;
  opacity: 0.25;
  transition: opacity 0.3s ease;
}

.footer-theme-btn:hover {
  opacity: 0.6;
}

.footer-theme-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background 0.4s ease;
}

/* Dropdown — opens upward from bottom */
.theme-options {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  z-index: 100;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: var(--card-border);
  border-radius: 12px;
  padding: 0.4rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 1px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s cubic-bezier(0.22, 0.1, 0.15, 1);
  min-width: 150px;
  margin-bottom: 4px;
}

.theme-options.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.theme-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.7rem;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--text-secondary);
  transition: background 0.2s, color 0.2s;
  text-align: left;
  width: 100%;
}

.theme-option:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.theme-option.active {
  color: var(--accent);
  font-weight: 500;
}

.theme-option .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ============================================================
   Hero Section
   ============================================================ */
.hero {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: var(--hero-padding);
}

/* ── Hero Card (shared skeleton, theme-driven) ── */
.hero-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(var(--card-glass-blur)) saturate(120%);
  -webkit-backdrop-filter: blur(var(--card-glass-blur)) saturate(120%);
  border: var(--card-border);
  border-radius: var(--card-radius);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  max-width: 640px;
  width: 100%;
  overflow: hidden;
  animation: cardEntrance 1.2s cubic-bezier(0.22, 0.1, 0.15, 1) both;
  transition: background 0.5s ease, border-color 0.5s ease, box-shadow 0.5s ease,
              border-radius 0.5s ease, backdrop-filter 0.5s ease;
}

[data-theme="minimal"] .hero-card {
  max-width: 800px;
}

.card-sparkle {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 20%, rgba(212, 120, 138, 0.08) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 80%, rgba(200, 150, 62, 0.05) 0%, transparent 50%);
  pointer-events: none;
  animation: sparkleShift 8s ease-in-out infinite;
}

[data-theme="minimal"] .card-sparkle {
  display: none;
}

.card-inner {
  position: relative;
  padding: var(--card-padding);
  text-align: center;
  transition: padding 0.5s ease;
}

@keyframes cardEntrance {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes sparkleShift {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(1%, -1%) rotate(1deg); }
  66% { transform: translate(-1%, 1%) rotate(-1deg); }
}

/* ============================================================
   Typewriter
   ============================================================ */
.typewriter-container {
  position: relative;
  min-height: 120px;
}

.typewriter-zh {
  font-family: var(--font-zh);
  font-size: var(--font-size-h1);
  font-weight: 600;
  color: var(--text-heading);
  letter-spacing: 0.06em;
  line-height: 1.6;
  margin-bottom: 0.6rem;
  transition: color 0.5s ease, font-size 0.5s ease;
}

[data-theme="minimal"] .typewriter-zh {
  font-size: var(--font-size-h1-minimal);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1.35;
  margin-bottom: 1rem;
}

.typewriter-en {
  font-family: var(--font-display);
  font-size: var(--font-size-en);
  font-weight: 400;
  font-style: italic;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
  min-height: 1.6em;
  transition: color 0.5s ease, font-size 0.5s ease;
}

[data-theme="minimal"] .typewriter-en {
  font-size: var(--font-size-en-minimal);
  color: var(--text-muted);
}

.cursor {
  display: inline-block;
  color: var(--accent-soft);
  font-weight: 300;
  animation: blink 0.8s step-end infinite;
  margin-left: 2px;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ============================================================
   Card Divider
   ============================================================ */
.card-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 2rem 0 1.5rem;
  opacity: 0;
  animation: fadeIn 0.6s 0.8s ease-out forwards;
  transition: margin 0.5s ease;
}

[data-theme="minimal"] .card-divider {
  margin: 2.5rem 0 1rem;
}

.divider-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--divider-color), transparent);
}

.divider-icon {
  color: var(--gold);
  font-size: 0.9rem;
}

[data-theme="minimal"] .divider-icon {
  color: var(--accent);
  font-size: 0.7rem;
}

@keyframes fadeIn {
  to { opacity: 1; }
}

/* ============================================================
   Hero Subtitle
   ============================================================ */
.hero-subtitle-zh {
  font-family: var(--font-zh);
  font-size: var(--font-size-subtitle-zh);
  color: var(--text-muted);
  letter-spacing: 0.08em;
  opacity: 0;
  animation: fadeIn 0.5s 0.5s ease-out forwards;
}

.hero-subtitle-en {
  font-family: var(--font-display);
  font-size: var(--font-size-subtitle-en);
  font-style: italic;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  margin-top: 0.3rem;
  opacity: 0;
  animation: fadeIn 0.4s 0.55s ease-out forwards;
}

/* ============================================================
   Scroll Indicator
   ============================================================ */
.scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  opacity: 0;
  animation: fadeIn 0.6s 1.6s ease-out forwards;
}

.scroll-arrow {
  display: block;
  width: 28px;
  height: 28px;
  border-right: 1.5px solid var(--text-secondary);
  border-bottom: 1.5px solid var(--text-secondary);
  transform: rotate(45deg);
  animation: scrollBounce 2s ease-in-out infinite;
  transition: border-color 0.5s ease;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translate(0, 0); opacity: 0.5; }
  50% { transform: rotate(45deg) translate(6px, 6px); opacity: 1; }
}

/* ============================================================
   Display Mode Switcher
   ============================================================ */
.display-switcher {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.4rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.display-btn {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-zh);
  font-size: 0.7rem;
  color: var(--text-muted);
  transition: all 0.25s ease;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.display-btn:hover {
  border-color: var(--accent);
  color: var(--accent-soft);
}

.display-btn.active {
  border-color: var(--accent);
  background: rgba(196, 85, 107, 0.1);
  color: var(--accent);
}

[data-theme="minimal"] .display-btn.active {
  background: #111;
  color: #fafaf8;
  border-color: #111;
}

[data-theme="vintage"] .display-btn.active {
  background: rgba(196, 122, 56, 0.12);
  border-color: var(--accent);
}

[data-theme="starry"] .display-btn.active {
  background: rgba(123, 158, 212, 0.12);
  border-color: var(--accent);
}

/* ============================================================
   Photo Wall Section
   ============================================================ */
.photowall {
  position: relative;
  z-index: 1;
  padding: var(--section-padding);
  max-width: 1400px;
  margin: 0 auto;
  transition: padding 0.5s ease;
}

[data-theme="minimal"] .photowall {
  max-width: 1200px;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-title-zh {
  font-family: var(--font-zh);
  font-size: var(--font-size-section-zh);
  font-weight: 600;
  color: var(--text-heading);
  letter-spacing: 0.1em;
  transition: color 0.5s ease;
}

[data-theme="minimal"] .section-title-zh {
  font-weight: 400;
  letter-spacing: 0.14em;
}

.section-title-en {
  font-family: var(--font-display);
  font-size: var(--font-size-section-en);
  font-weight: 400;
  font-style: italic;
  color: var(--text-secondary);
  margin-top: 0.3rem;
  transition: color 0.5s ease;
}

.section-ornament {
  width: 60px;
  height: 2px;
  margin: 1.2rem auto 0;
  background: linear-gradient(to right, transparent, var(--accent), transparent);
  border-radius: 1px;
  transition: background 0.5s ease;
}

[data-theme="minimal"] .section-ornament {
  height: 1px;
  width: 40px;
}

/* ── Photo Grid Base ── */
.photo-grid {
  position: relative;
}

/* ── Waterfall (default) ── */
[data-display="waterfall"] .photo-grid {
  column-count: 4;
  column-gap: var(--photo-gap);
  transition: column-gap 0.5s ease;
}

/* ── Alternating / Staggered ── */
[data-display="alternating"] .photo-grid {
  max-width: 700px;
  margin: 0 auto;
}

[data-display="alternating"] .photo-item {
  width: 60%;
  margin: 1.2rem 0;
  border-radius: var(--photo-radius);
  overflow: hidden;
  background: var(--photo-bg);
}

[data-display="alternating"] .photo-item:nth-child(odd) {
  margin-left: 0;
  margin-right: auto;
}

[data-display="alternating"] .photo-item:nth-child(even) {
  margin-left: auto;
  margin-right: 0;
}

/* Stagger offsets */
[data-display="alternating"] .photo-item:nth-child(4n+2) { margin-top: 3rem; }
[data-display="alternating"] .photo-item:nth-child(4n+3) { margin-top: 0.5rem; }
[data-display="alternating"] .photo-item:nth-child(4n+4) { margin-top: 2.5rem; }

[data-display="alternating"] .photo-item:hover {
  transform: scale(1.03) !important;
}

/* ── Magazine Layout ── */
[data-display="magazine"] .photo-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--photo-gap);
}

[data-display="magazine"] .photo-item {
  margin-bottom: 0;
  break-inside: unset;
}

[data-display="magazine"] .photo-item img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

[data-display="magazine"] .photo-item:hover {
  transform: scale(1.02) !important;
  z-index: 2;
}

[data-display="magazine"] .photo-item:hover img {
  transform: scale(1.06);
}

/* ── Timeline ── */
[data-display="timeline"] .photo-grid {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

[data-display="timeline"] .photo-grid::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--accent), var(--accent), transparent);
  opacity: 0.25;
  transform: translateX(-50%);
}

[data-display="timeline"] .photo-item {
  width: 44%;
  margin: 2.5rem 0;
  position: relative;
}

[data-display="timeline"] .photo-item:nth-child(odd) {
  margin-left: auto;
  margin-right: 8%;
}

[data-display="timeline"] .photo-item:nth-child(even) {
  margin-right: auto;
  margin-left: 8%;
}

/* Timeline dot */
.timeline-dot {
  position: absolute;
  top: 50%;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-primary);
  transform: translateY(-50%);
  z-index: 2;
}

[data-display="timeline"] .photo-item:nth-child(odd) .timeline-dot {
  left: -28px;
}

[data-display="timeline"] .photo-item:nth-child(even) .timeline-dot {
  right: -28px;
}

/* Timeline label */
.timeline-label {
  position: absolute;
  padding: 0.15rem 0.5rem;
  font-family: var(--font-display);
  font-size: 0.7rem;
  background: var(--accent);
  color: #fff;
  border-radius: 3px;
  opacity: 0.85;
  letter-spacing: 0.05em;
  pointer-events: none;
}

[data-display="timeline"] .photo-item:nth-child(odd) .timeline-label {
  right: -0.5rem;
  top: 0.5rem;
}

[data-display="timeline"] .photo-item:nth-child(even) .timeline-label {
  left: -0.5rem;
  top: 0.5rem;
}

/* Timeline hover */
[data-display="timeline"] .photo-item:hover {
  transform: scale(1.04) !important;
}

/* ── Polaroid Stack ── */
[data-display="polaroid"] .photo-grid {
  position: relative;
  height: 480px;
  width: 100%;
  overflow: hidden;
}

[data-display="polaroid"] .photo-item {
  position: absolute;
  background: #faf7f0;
  padding: 0.5rem 0.5rem 2rem;
  border-radius: 2px;
  box-shadow: 2px 4px 16px rgba(0, 0, 0, 0.18);
  transition: transform 0.35s ease, z-index 0s, box-shadow 0.35s ease;
  will-change: transform;
}

[data-display="polaroid"] .photo-item:hover {
  transform: scale(1.04);
  box-shadow: 4px 8px 28px rgba(0, 0, 0, 0.28);
  z-index: 999;
}

[data-display="polaroid"] .photo-item img {
  border-radius: 1px;
}

[data-display="polaroid"] .photo-item:hover img {
  transform: none;
}

/* ── Carousel ── */
[data-display="carousel"] .photo-grid {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  overflow: visible;
}

.carousel-container {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.carousel-track {
  display: flex;
  transition: transform 0.45s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.carousel-slide {
  flex: 0 0 100%;
  width: 100%;
}

.carousel-slide img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 65vh;
  object-fit: contain;
  border-radius: var(--photo-radius);
  cursor: pointer;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--lightbox-nav-border);
  background: var(--lightbox-nav-bg);
  color: var(--text-primary);
  font-size: 1.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s, border-color 0.3s;
  font-family: var(--font-display);
  line-height: 1;
  backdrop-filter: blur(4px);
}

.carousel-btn:hover {
  background: var(--lightbox-nav-hover-bg);
  border-color: var(--lightbox-nav-hover-border);
}

.carousel-btn--prev { left: 1rem; }
.carousel-btn--next { right: 1rem; }

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.2rem;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: none;
  background: var(--border-subtle);
  cursor: pointer;
  padding: 0;
  transition: background 0.3s, transform 0.3s;
}

.carousel-dot.active {
  background: var(--accent);
  transform: scale(1.3);
}

.carousel-dot:hover {
  background: var(--accent-soft);
}

/* ── Minimal Theme: Skin only (magazine mode owns layout) ── */
[data-theme="minimal"] .photo-item {
  margin-bottom: 0;
}

/* ── Photo Item (shared base) ── */
.photo-item {
  position: relative;
  border-radius: var(--photo-radius);
  overflow: hidden;
  cursor: pointer;
  background: var(--photo-bg);
  transition: transform 0.4s cubic-bezier(0.25, 0.1, 0.25, 1),
              box-shadow 0.4s cubic-bezier(0.25, 0.1, 0.25, 1),
              border-radius 0.5s ease, background 0.5s ease;
}

[data-display="waterfall"] .photo-item {
  break-inside: avoid;
  margin-bottom: var(--photo-gap);
}

.photo-item img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.25, 0.1, 0.25, 1),
              filter 0.5s cubic-bezier(0.25, 0.1, 0.25, 1);
  filter: brightness(var(--photo-brightness)) saturate(var(--photo-saturate));
}

.photo-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-photo-hover);
  z-index: 2;
}

.photo-item:hover img {
  transform: scale(1.04);
  filter: brightness(var(--photo-hover-brightness)) saturate(var(--photo-hover-saturate));
}

.photo-item::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--photo-radius);
  background: var(--photo-overlay);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.photo-item:hover::after {
  opacity: 1;
}

/* ── Vintage: Polaroid skin (waterfall mode) ──────── */
[data-theme="vintage"][data-display="waterfall"] .photo-grid {
  column-count: 3;
  column-gap: 1.8rem;
}

[data-theme="vintage"][data-display="waterfall"] .photo-item {
  background: #faf7f0;
  padding: 0.6rem 0.6rem 2.2rem;
  border-radius: 2px;
  box-shadow: 3px 5px 14px rgba(50, 30, 10, 0.12);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
  margin-bottom: 1.8rem;
}

[data-theme="vintage"][data-display="waterfall"] .photo-item:nth-child(odd) {
  transform: rotate(-1.2deg);
}
[data-theme="vintage"][data-display="waterfall"] .photo-item:nth-child(even) {
  transform: rotate(1.4deg);
}
[data-theme="vintage"][data-display="waterfall"] .photo-item:nth-child(3n) {
  transform: rotate(-2deg);
}

[data-theme="vintage"][data-display="waterfall"] .photo-item:hover {
  transform: rotate(0deg) scale(1.03) !important;
  box-shadow: 5px 8px 24px rgba(50, 30, 10, 0.22);
  z-index: 3;
}

[data-theme="vintage"] .photo-item img {
  border-radius: 1px;
  filter: sepia(0.25) brightness(0.92) saturate(0.8);
}

[data-theme="vintage"] .photo-item:hover img {
  filter: sepia(0) brightness(1.02) saturate(0.95);
}

/* ── Starry: subtle card glow ──────────────────── */
[data-theme="starry"] .hero-card {
  box-shadow: var(--shadow-card), 0 0 100px rgba(100, 150, 220, 0.08);
}

[data-theme="starry"] .photo-item {
  border-radius: 8px;
}

[data-theme="starry"] .photo-item:hover {
  box-shadow: 0 8px 36px rgba(120, 160, 220, 0.35);
}

/* ── Starry: twinkling star particles (canvas) ─── */
[data-theme="starry"] #hearts-canvas {
  display: block;
}

/* ── Vintage: grain always visible ──────────────── */
[data-theme="vintage"] .grain-overlay {
  display: block;
  opacity: 0.06;
}

/* ============================================================
   Scroll Reveal
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.22, 0.1, 0.15, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.photo-item {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 0.1, 0.15, 1),
              box-shadow 0.4s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.photo-item.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   Lightbox
   ============================================================ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg-lightbox);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

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

.lightbox-content {
  max-width: 90vw;
  max-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-content img {
  max-width: 90vw;
  max-height: 85vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: var(--shadow-lightbox);
  transform: scale(0.9);
  transition: transform 0.35s cubic-bezier(0.22, 0.1, 0.15, 1);
}

.lightbox.active .lightbox-content img {
  transform: scale(1);
}

.lightbox-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 2.2rem;
  cursor: pointer;
  z-index: 10;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.3s, color 0.3s;
  font-family: var(--font-display);
  line-height: 1;
}

.lightbox-close:hover {
  background: var(--lightbox-close-hover-bg);
  color: var(--accent-light);
}

.lightbox-prev,
.lightbox-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: var(--lightbox-nav-bg);
  border: 1px solid var(--lightbox-nav-border);
  color: var(--text-primary);
  font-size: 2.5rem;
  cursor: pointer;
  z-index: 10;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.3s, border-color 0.3s, color 0.3s;
  font-family: var(--font-display);
  line-height: 1;
}

.lightbox-prev { left: 1.5rem; }
.lightbox-next { right: 1.5rem; }

.lightbox-prev:hover,
.lightbox-next:hover {
  background: var(--lightbox-nav-hover-bg);
  border-color: var(--lightbox-nav-hover-border);
  color: var(--accent-light);
}

.lightbox-counter {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 3rem 2rem 4rem;
}

.footer-divider {
  width: 40px;
  height: 1px;
  margin: 0 auto 2rem;
  background: linear-gradient(to right, transparent, var(--divider-color), transparent);
}

.footer-text-zh {
  font-family: var(--font-zh);
  font-size: 0.9rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

.footer-text-en {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-style: italic;
  color: var(--text-secondary);
  margin-top: 0.2rem;
  letter-spacing: 0.05em;
}

.footer-date {
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 1.2rem;
  letter-spacing: 0.15em;
  opacity: 0.5;
}

/* ============================================================
   Responsive
   Mobile-first polish — the primary viewing target is phones.
   ============================================================ */

/* ── Tablet: ≤1024px ──────────────────────────── */
@media (max-width: 1024px) {
  [data-display="waterfall"] .photo-grid {
    column-count: 3;
    column-gap: 1rem;
  }
  [data-display="waterfall"] .photo-item {
    margin-bottom: 1rem;
  }
  .card-inner {
    padding: 2.5rem 2rem;
  }

  /* Magazine: 4 columns on tablet */
  [data-display="magazine"] .photo-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 0.8rem;
  }
}

/* ── Mobile: ≤768px ───────────────────────────── */
@media (max-width: 768px) {
  /* Safe area insets for notched phones */
  body {
    padding-top: env(safe-area-inset-top, 0px);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    padding-left: env(safe-area-inset-left, 0px);
    padding-right: env(safe-area-inset-right, 0px);
  }

  [data-display="waterfall"] .photo-grid {
    column-count: 2;
    column-gap: 0.6rem;
  }
  [data-display="waterfall"] .photo-item {
    margin-bottom: 0.6rem;
  }

  /* Hero */
  .hero {
    padding: 1.5rem;
  }
  .hero-card {
    max-width: 100%;
  }
  .card-inner {
    padding: 2rem 1.2rem;
  }
  .typewriter-zh {
    font-size: 1.25rem;
    letter-spacing: 0.04em;
  }
  .typewriter-en {
    font-size: 0.9rem;
  }
  .hero-subtitle-zh {
    font-size: 0.8rem;
  }
  .hero-subtitle-en {
    font-size: 0.72rem;
  }

  /* Card divider tighter */
  .card-divider {
    margin: 1.5rem 0 1rem;
    gap: 0.6rem;
  }

  /* Scroll indicator — keep inside hero, not cut off */
  .scroll-indicator {
    bottom: 1rem;
  }
  .scroll-arrow {
    width: 22px;
    height: 22px;
  }

  /* Photo wall */
  .photowall {
    padding: 2.5rem 0.8rem 3rem;
  }
  .section-header {
    margin-bottom: 2rem;
  }

  /* Lightbox — larger touch targets, bottom controls */
  .lightbox-content img {
    max-width: 92vw;
    max-height: 80vh;
  }
  .lightbox-close {
    top: 1rem;
    right: 1rem;
    width: 44px;
    height: 44px;
    font-size: 1.8rem;
    background: rgba(128, 128, 128, 0.15);
  }
  .lightbox-prev,
  .lightbox-next {
    width: 40px;
    height: 40px;
    font-size: 1.6rem;
  }
  .lightbox-prev { left: 0.6rem; }
  .lightbox-next { right: 0.6rem; }
  .lightbox-counter {
    bottom: 1rem;
    font-size: 0.75rem;
  }

  .theme-option {
    font-size: 0.72rem;
    padding: 0.45rem 0.6rem;
  }

  /* Footer */
  .footer {
    padding: 2rem 1rem 3rem;
  }

  /* Alternating: stack on mobile */
  [data-display="alternating"] .photo-item {
    width: 80%;
    margin: 1rem 0 1rem auto !important;
  }
  [data-display="alternating"] .photo-item:nth-child(4n+2) { margin-top: 2rem; }
  [data-display="alternating"] .photo-item:nth-child(4n+4) { margin-top: 1.5rem; }

  /* Magazine: 2-col grid */
  [data-display="magazine"] .photo-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.6rem;
  }
  [data-display="magazine"] .photo-item {
    grid-column: span 1 !important;
    grid-row: span 1 !important;
  }
  [data-display="magazine"] .photo-item:first-child {
    grid-column: span 2 !important;
  }

  /* Timeline: all left-aligned on mobile */
  [data-display="timeline"] .photo-grid::before {
    left: 20px;
  }
  [data-display="timeline"] .photo-item {
    width: 75%;
    margin: 2rem 0 2rem 3rem !important;
  }
  [data-display="timeline"] .photo-item .timeline-dot {
    left: -24px !important;
    right: auto !important;
  }
  [data-display="timeline"] .photo-item .timeline-label {
    left: 0.5rem !important;
    right: auto !important;
    top: 0.5rem !important;
  }

  /* Polaroid: shorter on mobile */
  [data-display="polaroid"] .photo-grid {
    height: 380px;
    overflow-y: auto;
  }
  [data-display="polaroid"] .photo-item {
    padding: 0.35rem 0.35rem 1.4rem;
  }

  /* Carousel: tighter on mobile */
  .carousel-btn {
    width: 40px;
    height: 40px;
    font-size: 1.4rem;
  }
  .carousel-btn--prev { left: 0.5rem; }
  .carousel-btn--next { right: 0.5rem; }
  .carousel-slide img { max-height: 55vh; }
  .carousel-dots { gap: 0.4rem; margin-top: 0.8rem; }
  .carousel-dot { width: 6px; height: 6px; }

  /* Minimal theme hero adjusts */
  [data-theme="minimal"] .hero-card {
    max-width: 100%;
  }
  [data-theme="minimal"] .card-inner {
    padding: 3rem 1.5rem 2rem;
  }
  [data-theme="minimal"] .typewriter-zh {
    font-size: clamp(1.5rem, 6vw, 2.2rem);
    letter-spacing: 0.03em;
  }
  [data-theme="minimal"] .typewriter-en {
    font-size: clamp(0.95rem, 3.5vw, 1.2rem);
  }
  [data-theme="minimal"] .section-title-zh {
    font-size: 1.4rem;
  }
}

/* ── Small Mobile: ≤420px ─────────────────────── */
@media (max-width: 420px) {
  [data-display="waterfall"] .photo-grid {
    column-count: 2;
    column-gap: 0.4rem;
  }
  [data-display="waterfall"] .photo-item {
    margin-bottom: 0.4rem;
  }
  .photo-item {
    border-radius: 8px;
  }

  .hero {
    padding: 1rem;
  }
  .card-inner {
    padding: 1.8rem 1rem;
  }
  .typewriter-zh {
    font-size: 1.15rem;
    letter-spacing: 0.03em;
  }
  .typewriter-en {
    font-size: 0.82rem;
  }
  .typewriter-container {
    min-height: 100px;
  }

  .card-divider {
    margin: 1.2rem 0 0.8rem;
    gap: 0.5rem;
  }

  .hero-subtitle-zh {
    font-size: 0.72rem;
  }
  .hero-subtitle-en {
    font-size: 0.65rem;
  }

  .photowall {
    padding: 2rem 0.6rem 2.5rem;
  }
  .section-header {
    margin-bottom: 1.5rem;
  }
  .section-title-zh {
    font-size: 1.2rem;
  }
  .section-title-en {
    font-size: 0.75rem;
  }

  .scroll-indicator {
    bottom: 0.8rem;
  }
  .scroll-arrow {
    width: 18px;
    height: 18px;
  }

  /* Lightbox: tighter on very small screens */
  .lightbox-prev,
  .lightbox-next {
    width: 36px;
    height: 36px;
    font-size: 1.4rem;
  }
  .lightbox-prev { left: 0.3rem; }
  .lightbox-next { right: 0.3rem; }

  /* Polaroid: shorter stack on small screen */
  [data-display="polaroid"] .photo-grid {
    height: 320px;
  }
  [data-display="polaroid"] .photo-item {
    padding: 0.25rem 0.25rem 1rem;
  }

  /* Carousel: even tighter */
  .carousel-btn {
    width: 36px;
    height: 36px;
    font-size: 1.2rem;
  }
  .carousel-slide img { max-height: 50vh; }

  /* Display switcher: more compact */
  .display-switcher { gap: 0.25rem; margin-top: 0.8rem; }
  .display-btn {
    width: 28px;
    height: 28px;
    font-size: 0.6rem;
    border-radius: 6px;
  }

  /* Minimal theme: all single-column on very small */
  [data-theme="minimal"] .photo-grid {
    gap: 0.4rem;
  }
  [data-theme="minimal"] .typewriter-zh {
    font-size: clamp(1.3rem, 6.5vw, 1.8rem);
  }
  [data-theme="minimal"] .card-inner {
    padding: 2.5rem 1.2rem 1.8rem;
  }
}

/* ── Touch / Active States (override hover on mobile) ── */
/* ── Vintage responsive ────────────────────────── */
@media (max-width: 1024px) {
  [data-theme="vintage"][data-display="waterfall"] .photo-grid {
    column-count: 2;
    column-gap: 1.2rem;
  }
  [data-theme="vintage"][data-display="waterfall"] .photo-item {
    margin-bottom: 1.2rem;
    padding: 0.4rem 0.4rem 1.6rem;
  }
}

@media (max-width: 768px) {
  [data-theme="vintage"][data-display="waterfall"] .photo-grid {
    column-count: 2;
    column-gap: 0.8rem;
  }
  [data-theme="vintage"][data-display="waterfall"] .photo-item {
    margin-bottom: 0.8rem;
    padding: 0.35rem 0.35rem 1.4rem;
  }
  [data-theme="vintage"][data-display="waterfall"] .photo-item:nth-child(odd) { transform: rotate(-0.8deg); }
  [data-theme="vintage"][data-display="waterfall"] .photo-item:nth-child(even) { transform: rotate(0.9deg); }
  [data-theme="vintage"][data-display="waterfall"] .photo-item:nth-child(3n) { transform: rotate(-1deg); }
}

@media (max-width: 420px) {
  [data-theme="vintage"][data-display="waterfall"] .photo-grid {
    column-count: 2;
    column-gap: 0.5rem;
  }
  [data-theme="vintage"][data-display="waterfall"] .photo-item {
    margin-bottom: 0.5rem;
    padding: 0.3rem 0.3rem 1.2rem;
  }

  [data-theme="starry"] .card-inner {
    padding: 2rem 1.2rem;
  }
}

/* ── Touch / Active States (override hover on mobile) ── */
@media (hover: none) and (pointer: coarse) {
  [data-display="waterfall"] .photo-item:active,
  [data-display="magazine"] .photo-item:active,
  [data-display="alternating"] .photo-item:active {
    transform: scale(0.97);
    box-shadow: var(--shadow-photo-hover);
    transition: transform 0.15s ease;
  }
  .photo-item:active img {
    filter: brightness(var(--photo-hover-brightness)) saturate(var(--photo-hover-saturate));
  }
  .photo-item:active::after {
    opacity: 1;
  }

  /* Polaroid: bring to front on tap */
  [data-display="polaroid"] .photo-item:active {
    z-index: 999;
    box-shadow: 4px 8px 28px rgba(0, 0, 0, 0.28);
  }

  /* Timeline: scale up slightly */
  [data-display="timeline"] .photo-item:active {
    transform: scale(1.03);
  }

  .lightbox-prev:active,
  .lightbox-next:active,
  .lightbox-close:active {
    background: var(--lightbox-nav-hover-bg);
    color: var(--accent-light);
  }
}