/* ============================================
   燕云助手 · 宋韵新墨
   ============================================ */

:root {
  --ink-deep: #0A0908;
  --ink: #13110F;
  --ink-2: #1C1916;
  --dai: #1B3A4B;
  --dai-deep: #0F2A37;
  --paper: #F5E6C8;
  --paper-light: #FAF6EC;
  --cin: #C73E1D;
  --cin-deep: #A82F12;
  --gold: #D4AF37;
  --gold-light: #E5C158;
  --ash: #7A7A7A;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--ink-deep);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% 0%, rgba(27, 58, 75, 0.18), transparent 60%),
    radial-gradient(ellipse 60% 50% at 50% 100%, rgba(199, 62, 29, 0.08), transparent 60%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 纸面噪点纹理 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' seed='3'/><feColorMatrix values='0 0 0 0 0.96 0 0 0 0 0.9 0 0 0 0 0.78 0 0 0 0.08 0'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
  opacity: 0.5;
  mix-blend-mode: overlay;
}

main, section, header, footer { position: relative; z-index: 2; }

/* ============================================
   导航
   ============================================ */
#navbar {
  background: linear-gradient(to bottom, rgba(10, 9, 8, 0.95) 0%, rgba(10, 9, 8, 0) 100%);
  backdrop-filter: blur(0px);
}
#navbar.scrolled {
  background: rgba(10, 9, 8, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}

.nav-link {
  position: relative;
  padding: 0.5rem 1rem;
  font-family: "Noto Serif SC", serif;
  color: #F5E6C8;
  font-size: 0.95rem;
  letter-spacing: 0.15em;
  transition: color 0.3s;
}
.nav-link::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--gold);
  transition: all 0.3s;
  transform: translateX(-50%);
}
.nav-link:hover { color: var(--gold-light); }
.nav-link:hover::before { width: 70%; }

/* ============================================
   CTA Buttons
   ============================================ */
.cta-btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 0.85rem 1.8rem;
  background: var(--cin);
  color: var(--paper-light);
  font-family: "Noto Serif SC", serif;
  font-weight: 600;
  letter-spacing: 0.15em;
  font-size: 0.95rem;
  border: 1px solid var(--gold);
  position: relative;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}
.cta-btn-primary::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(120deg, transparent, rgba(229, 193, 88, 0.3), transparent);
  transition: left 0.6s;
}
.cta-btn-primary:hover {
  background: var(--cin-deep);
  border-color: var(--gold-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(199, 62, 29, 0.3);
}
.cta-btn-primary:hover::before { left: 100%; }

.cta-btn-secondary {
  display: inline-flex;
  align-items: center;
  padding: 0.85rem 1.8rem;
  background: transparent;
  color: var(--paper);
  font-family: "Noto Serif SC", serif;
  font-weight: 500;
  letter-spacing: 0.15em;
  font-size: 0.95rem;
  border: 1px solid rgba(212, 175, 55, 0.5);
  transition: all 0.4s;
  cursor: pointer;
}
.cta-btn-secondary:hover {
  background: rgba(212, 175, 55, 0.08);
  border-color: var(--gold);
  color: var(--gold-light);
}

/* ============================================
   Hero
   ============================================ */
#hero {
  background:
    radial-gradient(ellipse at center, rgba(27, 58, 75, 0.2) 0%, transparent 50%);
}

.vertical-text {
  writing-mode: vertical-rl;
  text-orientation: upright;
}

.stat-cell {
  padding: 1.5rem 0;
  border-left: 1px solid rgba(212, 175, 55, 0.2);
  text-align: center;
}
.stat-cell:first-child { border-left: none; }
.stat-num {
  font-family: "ZCOOL XiaoWei", serif;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--paper);
  line-height: 1;
}
.stat-label {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  color: var(--ash);
  letter-spacing: 0.3em;
  margin-top: 0.5rem;
  text-transform: uppercase;
}

.scroll-line {
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============================================
   墨滴入场
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-up {
  opacity: 0;
  transform: translateY(20px);
  animation: revealUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes revealUp {
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   印章浮动
   ============================================ */
.stamp-float { animation: stampFloat 8s ease-in-out infinite; }
.stamp-float-delayed { animation: stampFloat 8s ease-in-out 4s infinite; }
@keyframes stampFloat {
  0%, 100% { transform: translateY(0) rotate(-6deg); }
  50% { transform: translateY(-20px) rotate(-3deg); }
}

/* ============================================
   Feature Cards
   ============================================ */
.feature-card {
  position: relative;
  padding: 2.5rem 2rem;
  background: linear-gradient(180deg, rgba(28, 25, 22, 0.6) 0%, rgba(19, 17, 15, 0.8) 100%);
  border: 1px solid rgba(212, 175, 55, 0.15);
  transition: all 0.5s;
  cursor: default;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 240px;
}
.feature-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(199, 62, 29, 0.05) 100%);
  opacity: 0;
  transition: opacity 0.5s;
  pointer-events: none;
}
.feature-card:hover {
  border-color: rgba(212, 175, 55, 0.5);
  transform: translateY(-4px);
}
.feature-card:hover::before { opacity: 1; }

.card-corner {
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1px solid var(--gold);
  transition: all 0.4s;
  z-index: 1;
}
.card-corner.tl { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.card-corner.tr { top: -1px; right: -1px; border-left: 0; border-bottom: 0; }
.card-corner.bl { bottom: -1px; left: -1px; border-right: 0; border-top: 0; }
.card-corner.br { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }
.feature-card:hover .card-corner { width: 24px; height: 24px; }

.card-seal {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "ZCOOL XiaoWei", serif;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0;
}

.card-title {
  font-family: "ZCOOL XiaoWei", serif;
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--paper);
  margin-bottom: 0.75rem;
  letter-spacing: 0.1em;
  position: relative;
  z-index: 1;
}
.card-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(245, 230, 200, 0.7);
  position: relative;
  z-index: 1;
  flex: 1;
}
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
  position: relative;
  z-index: 1;
}
.card-tags li {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.65rem;
  padding: 0.25rem 0.6rem;
  border: 1px solid rgba(212, 175, 55, 0.3);
  color: var(--gold-light);
  letter-spacing: 0.1em;
}

/* ============================================
   Platform Cards
   ============================================ */
.platform-card {
  position: relative;
  padding: 3rem 2.5rem;
  background: linear-gradient(180deg, rgba(28, 25, 22, 0.7) 0%, rgba(10, 9, 8, 0.9) 100%);
  border: 1px solid rgba(212, 175, 55, 0.2);
  transition: all 0.5s;
}
.platform-card:hover {
  border-color: var(--gold);
  box-shadow: 0 0 40px rgba(212, 175, 55, 0.1);
}
.platform-check {
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--cin);
  color: var(--paper-light);
  font-weight: 700;
  font-size: 0.85rem;
}
.platform-card:nth-child(2) .platform-check {
  background: var(--dai);
  color: var(--gold-light);
}

/* ============================================
   Tech Cards
   ============================================ */
.tech-card {
  position: relative;
  padding: 2.5rem 2rem;
  background: linear-gradient(180deg, rgba(19, 17, 15, 0.6) 0%, rgba(10, 9, 8, 0.9) 100%);
  border: 1px solid rgba(212, 175, 55, 0.15);
  transition: all 0.5s;
  overflow: hidden;
}
.tech-card:hover {
  border-color: var(--gold);
  transform: translateY(-4px);
}
.tech-num {
  position: absolute;
  top: -1rem;
  right: 1.5rem;
  font-family: "Cinzel", serif;
  font-size: 6rem;
  font-weight: 700;
  color: rgba(212, 175, 55, 0.08);
  line-height: 1;
  letter-spacing: -0.05em;
}
.tech-icon-wrap {
  display: inline-flex;
  padding: 1rem;
  background: rgba(212, 175, 55, 0.08);
  border: 1px solid rgba(212, 175, 55, 0.2);
  margin-bottom: 1.5rem;
}
.tech-title {
  font-family: "ZCOOL XiaoWei", serif;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--paper);
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}
.tech-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(245, 230, 200, 0.7);
  margin-bottom: 1.5rem;
}
.tech-bar {
  height: 4px;
  background: rgba(212, 175, 55, 0.1);
  margin-bottom: 0.5rem;
  overflow: hidden;
}
.tech-bar-fill {
  height: 100%;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 1.2s ease;
}
.tech-card.visible .tech-bar-fill { transform: scaleX(1); }
.tech-stat {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  color: var(--ash);
  letter-spacing: 0.1em;
}

.tech-chip {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  color: var(--gold-light);
  border: 1px solid rgba(212, 175, 55, 0.3);
  background: rgba(212, 175, 55, 0.05);
  letter-spacing: 0.1em;
  transition: all 0.3s;
}
.tech-chip:hover {
  background: rgba(212, 175, 55, 0.15);
  color: var(--paper);
  transform: translateY(-2px);
}

/* ============================================
   Screenshots Gallery Grid
   ============================================ */
.shot-item {
  position: relative;
  cursor: zoom-in;
  overflow: hidden;
  border: 1px solid rgba(212, 175, 55, 0.2);
  background: rgba(19, 17, 15, 0.6);
  transition: all 0.4s ease;
  aspect-ratio: 4 / 3;
}
.shot-item:hover {
  border-color: var(--gold);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(212, 175, 55, 0.15);
}
.shot-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease, filter 0.4s ease;
}
.shot-item:hover img {
  transform: scale(1.05);
  filter: brightness(1.1);
}
.shot-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10, 9, 8, 0.85) 0%, transparent 50%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1rem 1.25rem;
  opacity: 0;
  transition: opacity 0.4s ease;
}
.shot-item:hover .shot-overlay {
  opacity: 1;
}
.shot-overlay-name {
  font-family: "Noto Serif SC", serif;
  font-size: 0.95rem;
  color: var(--paper-light);
  font-weight: 500;
  letter-spacing: 0.1em;
}
.shot-overlay-desc {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.6rem;
  color: var(--ash);
  letter-spacing: 0.15em;
  margin-top: 0.25rem;
}
.shot-num {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  font-family: "Cinzel", serif;
  font-size: 0.65rem;
  padding: 0.25rem 0.6rem;
  background: var(--cin);
  color: var(--paper-light);
  letter-spacing: 0.15em;
  z-index: 2;
}

/* ============================================
   Steps
   ============================================ */
.step-card {
  position: relative;
  padding: 2rem 1.5rem;
  background: rgba(19, 17, 15, 0.5);
  border: 1px solid rgba(212, 175, 55, 0.2);
  text-align: center;
  transition: all 0.4s;
}
.step-card:hover {
  border-color: var(--gold);
  background: rgba(28, 25, 22, 0.7);
}
.step-num {
  font-family: "ZCOOL XiaoWei", serif;
  font-size: 2rem;
  color: var(--cin);
  font-weight: 700;
  margin-bottom: 1rem;
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(199, 62, 29, 0.1);
  border: 1px solid var(--cin);
}
.step-title {
  font-family: "Noto Serif SC", serif;
  font-size: 1.25rem;
  color: var(--paper);
  font-weight: 600;
  margin-bottom: 0.75rem;
  letter-spacing: 0.1em;
}
.step-desc {
  font-size: 0.85rem;
  line-height: 1.6;
  color: rgba(245, 230, 200, 0.7);
}
.step-foot {
  margin-top: 1.5rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.65rem;
  color: var(--gold);
  letter-spacing: 0.3em;
  padding-top: 1rem;
  border-top: 1px solid rgba(212, 175, 55, 0.15);
}

/* ============================================
   FAQ
   ============================================ */
.faq-item {
  background: rgba(19, 17, 15, 0.6);
  border: 1px solid rgba(212, 175, 55, 0.15);
  padding: 0;
  transition: all 0.3s;
}
.faq-item[open] {
  border-color: var(--cin);
  background: rgba(28, 25, 22, 0.8);
}
.faq-item summary {
  list-style: none;
  padding: 1.5rem 2rem;
  cursor: pointer;
  font-family: "Noto Serif SC", serif;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--paper);
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-family: "JetBrains Mono", monospace;
  font-size: 1.5rem;
  color: var(--gold);
  transition: transform 0.3s;
  flex-shrink: 0;
}
.faq-item[open] summary::after { transform: rotate(45deg); color: var(--cin); }
.faq-body {
  padding: 0 2rem 1.75rem 2rem;
  font-size: 0.9rem;
  line-height: 1.85;
  color: rgba(245, 230, 200, 0.75);
  border-top: 1px solid rgba(212, 175, 55, 0.1);
  padding-top: 1.25rem;
}
.faq-body strong { color: var(--gold-light); font-weight: 500; }

/* ============================================
   墨点粒子
   ============================================ */
.ink-particles { position: absolute; inset: 0; }
.ink-dot {
  position: absolute;
  background: var(--paper);
  border-radius: 50%;
  opacity: 0;
  animation: inkFloat linear infinite;
  pointer-events: none;
}
@keyframes inkFloat {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 0.4; }
  90% { opacity: 0.4; }
  100% { transform: translateY(-20px) scale(1); opacity: 0; }
}

/* ============================================
   Video Showcase
   ============================================ */
.video-card {
  position: relative;
  transition: transform 0.4s ease;
}
.video-card:hover {
  transform: translateY(-4px);
}

.video-player-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--ink-deep);
  border: 1px solid rgba(212, 175, 55, 0.2);
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.4s, box-shadow 0.4s;
}
.video-player-wrap:hover {
  border-color: var(--gold);
  box-shadow: 0 0 30px rgba(212, 175, 55, 0.12);
}
.video-player-wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.85;
  z-index: 1;
  transition: opacity 0.5s ease;
  pointer-events: none;
}
.video-player-wrap.playing::before { opacity: 0; }

.video-player {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  position: relative;
  z-index: 2;
}

/* Overlay content (poster layer) */
.video-overlay {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(10, 9, 8, 0.3);
  transition: opacity 0.4s ease;
  pointer-events: none;
}
.video-player-wrap.playing .video-overlay {
  opacity: 0;
  pointer-events: none;
}
.video-player-wrap.paused .video-overlay {
  opacity: 1;
}

.video-play-btn {
  width: 5rem;
  height: 5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(199, 62, 29, 0.85);
  border: 2px solid var(--gold);
  border-radius: 50%;
  transition: all 0.3s ease;
  backdrop-filter: blur(4px);
  pointer-events: auto;
}
.video-card:hover .video-play-btn {
  background: var(--cin);
  transform: scale(1.08);
  box-shadow: 0 0 40px rgba(199, 62, 29, 0.5);
}

.video-label {
  position: absolute;
  bottom: 2.5rem;
  left: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  pointer-events: none;
}
.video-label-num {
  font-family: "Cinzel", serif;
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  background: var(--cin);
  color: var(--paper-light);
  letter-spacing: 0.15em;
}
.video-label-text {
  font-family: "Noto Serif SC", serif;
  font-size: 0.9rem;
  color: var(--paper-light);
  text-shadow: 0 1px 8px rgba(0,0,0,0.8);
  letter-spacing: 0.1em;
}
.video-duration {
  position: absolute;
  bottom: 2.5rem;
  right: 1.25rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  color: var(--paper-light);
  text-shadow: 0 1px 6px rgba(0,0,0,0.8);
  letter-spacing: 0.1em;
}

/* Controls bar */
.video-controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 4;
  background: linear-gradient(to top, rgba(10, 9, 8, 0.9), transparent);
  padding: 2rem 0.75rem 0.5rem;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.video-player-wrap:hover .video-controls,
.video-player-wrap.playing .video-controls {
  opacity: 1;
  pointer-events: auto;
}

.video-progress {
  height: 4px;
  background: rgba(255, 255, 255, 0.15);
  cursor: pointer;
  margin-bottom: 0.5rem;
  position: relative;
  pointer-events: auto;
}
.video-progress-bar {
  height: 100%;
  width: 0%;
  background: var(--cin);
  transition: width 0.1s linear;
  position: relative;
}
.video-progress-bar::after {
  content: "";
  position: absolute;
  right: -5px;
  top: 50%;
  transform: translateY(-50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cin);
  opacity: 0;
  transition: opacity 0.2s;
}
.video-progress:hover .video-progress-bar::after {
  opacity: 1;
}

.video-controls-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.video-ctrl-btn {
  background: transparent;
  border: none;
  color: var(--paper-100);
  opacity: 0.7;
  cursor: pointer;
  padding: 0.25rem;
  transition: opacity 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: auto;
}
.video-ctrl-btn:hover { opacity: 1; }

.video-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(19, 17, 15, 0.6);
  border: 1px solid rgba(212, 175, 55, 0.15);
  border-top: none;
}
.video-meta-tag {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.6rem;
  padding: 0.2rem 0.5rem;
  background: rgba(212, 175, 55, 0.15);
  color: var(--gold-light);
  letter-spacing: 0.1em;
  white-space: nowrap;
}

/* ============================================
   移动端优化
   ============================================ */

/* 触摸友好 - 更大的点击区域 */
@media (hover: none) and (pointer: coarse) {
  .nav-link { padding: 0.75rem 1rem; }
  .cta-btn-primary, .cta-btn-secondary { padding: 1rem 2rem; }
  .video-play-btn { width: 4rem; height: 4rem; }
  .video-controls { opacity: 1; pointer-events: auto; }
  .video-player-wrap.playing .video-overlay,
  .video-player-wrap.paused .video-overlay {
    opacity: 1;
    pointer-events: none;
  }
  .video-player-wrap.playing .video-overlay {
    opacity: 0;
  }
}

/* 移动端响应式 */
@media (max-width: 768px) {
  .stat-cell { padding: 0.75rem 0; }
  .stat-num { font-size: 1.5rem; }
  .feature-card, .platform-card, .tech-card, .step-card { padding: 1.5rem 1.25rem; }
  .shot-overlay { opacity: 1; padding: 0.75rem 1rem; }
  .shot-overlay-name { font-size: 0.85rem; }
  .faq-item summary { padding: 1.25rem 1.25rem; font-size: 0.95rem; }
  .faq-body { padding: 0 1.25rem 1.25rem 1.25rem; }

  /* Hero 移动端 */
  .vertical-text { display: none; }
  #hero .stat-cell:first-child { border-left: 1px solid rgba(212, 175, 55, 0.2); }
  #hero .stat-cell:nth-child(2) { border-left: none; }
  #hero .stat-cell:nth-child(3) { border-left: 1px solid rgba(212, 175, 55, 0.2); }

  /* 视频卡片移动端 */
  .video-label { bottom: 2rem; left: 0.75rem; }
  .video-label-text { font-size: 0.8rem; }
  .video-duration { bottom: 2rem; right: 0.75rem; font-size: 0.65rem; }
  .video-meta { flex-wrap: wrap; }
  .video-card { margin-bottom: 0; }

  /* 移动端触控优化 - 截图画廊网格 */
  section { padding-top: 5rem !important; padding-bottom: 5rem !important; }

  /* 防止内容溢出 */
  .card-tags { gap: 0.35rem; }
  .card-tags li { font-size: 0.6rem; padding: 0.2rem 0.4rem; }

  /* 步骤卡片 */
  .step-card { padding: 1.25rem 1rem; }
  .step-num { font-size: 1.5rem; padding: 0.35rem 0.75rem; }

  /* 平台卡片 */
  .platform-card { padding: 1.5rem 1.25rem; }
}

/* 小屏移动端 */
@media (max-width: 480px) {
  .stat-cell { padding: 0.5rem 0; }
  .stat-num { font-size: 1.25rem; }
  .stat-label { font-size: 0.6rem; }
  .video-label-text { font-size: 0.7rem; }
  .video-label-num { font-size: 0.6rem; }
  .video-play-btn { width: 3.5rem; height: 3.5rem; }
  .video-play-btn svg { width: 1.75rem; height: 1.75rem; }
}

/* ============================================
   选区颜色
   ============================================ */
::selection {
  background: var(--cin);
  color: var(--paper-light);
}

/* ============================================
   滚动条
   ============================================ */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--ink-deep); }
::-webkit-scrollbar-thumb { background: rgba(212, 175, 55, 0.3); }
::-webkit-scrollbar-thumb:hover { background: var(--cin); }