/* ============================================================
   AI-CAM Studio 官网 · 暗色霓虹主题
   ============================================================ */

:root {
  --bg: #05060f;
  --bg-soft: #0a0d1e;
  --card: rgba(255, 255, 255, 0.045);
  --card-border: rgba(255, 255, 255, 0.09);
  --text: #eef1ff;
  --text-dim: #9aa3c0;
  --text-faint: #5d6584;
  --cyan: #22d3ee;
  --violet: #a78bfa;
  --magenta: #f472b6;
  --grad: linear-gradient(100deg, #22d3ee 0%, #a78bfa 50%, #f472b6 100%);
  --radius: 18px;
  --font: "Segoe UI", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.6;
}

::selection { background: rgba(167, 139, 250, 0.4); }

/* ---------------- 背景层 ---------------- */

#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(110px);
  opacity: 0.22;
  z-index: 0;
  pointer-events: none;
}
.bg-glow-1 {
  width: 620px; height: 620px;
  background: radial-gradient(circle, #22d3ee, transparent 70%);
  top: -180px; left: -140px;
  animation: float-a 16s ease-in-out infinite alternate;
}
.bg-glow-2 {
  width: 700px; height: 700px;
  background: radial-gradient(circle, #f472b6, transparent 70%);
  bottom: -260px; right: -200px;
  animation: float-b 20s ease-in-out infinite alternate;
}
@keyframes float-a { to { transform: translate(120px, 90px) scale(1.15); } }
@keyframes float-b { to { transform: translate(-140px, -80px) scale(1.1); } }

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(120, 140, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 140, 255, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 30%, transparent 75%);
}

/* ---------------- 通用 ---------------- */

.section {
  position: relative;
  z-index: 1;
  max-width: 1160px;
  margin: 0 auto;
  padding: 96px 28px;
}

.section-head { text-align: center; margin-bottom: 56px; }

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.28em;
  color: var(--cyan);
  border: 1px solid rgba(34, 211, 238, 0.35);
  border-radius: 999px;
  padding: 5px 16px;
  margin-bottom: 18px;
  background: rgba(34, 211, 238, 0.06);
}

.section-head h2 {
  font-size: clamp(30px, 4.5vw, 46px);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}

.section-head p { color: var(--text-dim); font-size: 16px; }

.gradient-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------------- 按钮 ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 700;
  font-size: 15px;
  padding: 14px 28px;
  text-decoration: none;
  border-radius: 14px;
  transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
  cursor: pointer;
  white-space: nowrap;
  border: none;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  color: #04121a;
  background: linear-gradient(100deg, #38e1f8, #b795ff 55%, #ff8ecb);
  box-shadow: 0 6px 28px rgba(96, 165, 250, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 40px rgba(167, 139, 250, 0.5);
}

.btn-ghost {
  color: var(--text);
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.09); transform: translateY(-2px); }

.btn-sm { padding: 9px 18px; font-size: 13px; }
.btn-lg { padding: 16px 34px; font-size: 17px; border-radius: 16px; }
.btn-xl { padding: 20px 46px; font-size: 19px; border-radius: 18px; }

.btn-note {
  font-size: 12px;
  font-weight: 600;
  opacity: 0.72;
  border-left: 1px solid rgba(0, 0, 0, 0.25);
  padding-left: 10px;
  margin-left: 4px;
}

/* ---------------- 导航 ---------------- */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  /* 纯色不透明背景：防止滚动时页面内容透过顶栏与文字叠加 */
  background: var(--bg);
  border-bottom: 1px solid rgba(148, 163, 255, 0.10);
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
}
.nav.scrolled {
  background: var(--bg);
  border-bottom-color: rgba(148, 163, 255, 0.16);
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.5), 0 1px 0 rgba(124, 92, 252, 0.12);
}
.nav-inner {
  max-width: 1280px;   /* 比内容区（1160）略宽：统一顶栏含徽标/登录/CTA 后需要更大预算 */
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: nowrap;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-size: 18px;
  font-weight: 800;
  transition: transform 0.25s ease;
}
.logo:hover { transform: translateY(-1px); }
.logo-mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  filter: drop-shadow(0 0 8px rgba(167, 139, 250, 0.45));
  transition: filter 0.25s ease;
}
.logo:hover .logo-mark {
  filter: drop-shadow(0 0 14px rgba(167, 139, 250, 0.75));
}
.inline-logo {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  vertical-align: -3px;
}
.logo-text em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-left: 4px;
}
.nav-links {
  display: flex;
  gap: 14px;
  margin-left: auto;
  flex-wrap: nowrap;
  align-items: center;
}
.nav-links a {
  position: relative;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  padding: 6px 2px;   /* 扩大点击热区，交互更友好 */
  transition: color 0.2s;
  white-space: nowrap;   /* 防止英文长链接（如 Online Experience）词间断行 */
  flex-shrink: 0;
}
/* hover 时从左滑入的渐变下划线 */
.nav-links a:not(.nav-lang)::after {
  content: '';
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad);
  opacity: 0;
  transition: right 0.25s ease, opacity 0.25s ease;
}
.nav-links a:not(.nav-lang):hover::after {
  right: 0;
  opacity: 1;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.nav-lang {
  border: 1px solid rgba(148, 163, 255, 0.35);
  border-radius: 999px;
  padding: 4px 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  transition: all 0.25s ease;
}
.nav-links a.nav-lang:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.08);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.15);
}
/* 当前页链接：常显渐变下划线 */
.nav-links a.nav-active { color: var(--text); }
.nav-links a.nav-active::after { right: 0; opacity: 1; }
/* 键盘导航焦点可见 */
.nav-links a:focus-visible,
.logo:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 积分徽标：导航栏常驻显示当前余额 */
.credits-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border-radius: 999px;
  background: linear-gradient(100deg, rgba(255, 209, 102, 0.12), rgba(244, 114, 182, 0.10));
  border: 1px solid rgba(255, 209, 102, 0.35);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-dim);
  white-space: nowrap;
  user-select: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.credits-badge:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(255, 209, 102, 0.18);
}
.credits-badge .credits-icon { font-size: 15px; }
.credits-badge b {
  color: #ffd166;
  font-weight: 800;
  font-size: 16px;
  text-shadow: 0 0 12px rgba(255, 209, 102, 0.4);
}

/* ---------------- Hero ---------------- */

.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 140px 28px 80px;
}
.hero-content { max-width: 860px; }

.hero-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: #b6f0fb;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 999px;
  padding: 8px 20px;
  margin-bottom: 30px;
  animation: badge-pulse 3.2s ease-in-out infinite;
}
@keyframes badge-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.25); }
  50% { box-shadow: 0 0 24px 4px rgba(34, 211, 238, 0.22); }
}

.hero h1 {
  font-size: clamp(40px, 7vw, 76px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 26px;
}

.hero-sub {
  color: var(--text-dim);
  font-size: clamp(15px, 2vw, 18px);
  max-width: 640px;
  margin: 0 auto 40px;
}
.hero-sub b { color: var(--cyan); font-weight: 700; }

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: clamp(24px, 5vw, 64px);
  flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.stat b {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-variant-numeric: tabular-nums;
}
.stat span { font-size: 12px; color: var(--text-faint); letter-spacing: 0.06em; }

.hero-scroll {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px; height: 40px;
  border: 2px solid rgba(255, 255, 255, 0.22);
  border-radius: 14px;
}
.hero-scroll i {
  position: absolute;
  top: 7px; left: 50%;
  width: 4px; height: 8px;
  margin-left: -2px;
  border-radius: 2px;
  background: var(--cyan);
  animation: scroll-dot 1.8s ease-in-out infinite;
}
@keyframes scroll-dot {
  0% { transform: translateY(0); opacity: 1; }
  70% { transform: translateY(14px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}

/* ---------------- 演示视频（9:16 竖屏 · 手机直播风格） ---------------- */

.showcase-stage {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

.showcase-copy { max-width: none; text-align: center; }
.showcase-copy h3 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 0;
}
.showcase-copy p { color: var(--text-dim); font-size: 15px; margin-bottom: 22px; }
.showcase-copy ul { list-style: none; }
.showcase-copy li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-dim);
  font-size: 14px;
  padding: 7px 0;
}
.showcase-copy li::before {
  content: "✔";
  color: var(--cyan);
  font-weight: 700;
}

.video-frame {
  position: relative;
  flex: 0 0 auto;
  width: min(320px, 78vw);
  border-radius: 32px;
  padding: 2px;
  background: linear-gradient(160deg, rgba(34, 211, 238, 0.55), rgba(167, 139, 250, 0.2) 40%, rgba(244, 114, 182, 0.55));
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6), 0 0 70px rgba(167, 139, 250, 0.2);
  animation: phone-float 6s ease-in-out infinite;
}
@keyframes phone-float {
  0%, 100% { transform: translateY(0) rotate(-1deg); }
  50% { transform: translateY(-14px) rotate(1deg); }
}
.video-frame video {
  display: block;
  width: 100%;
  border-radius: 30px;
  background: #000;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* ---- 原片 / AI 变老 拖动对比 ---- */

.compare {
  --cmp: 50%;
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: 30px;
  overflow: hidden;
  background: #000;
  touch-action: none;        /* 触屏拖动不被页面滚动打断 */
  cursor: ew-resize;
  user-select: none;
}
.compare-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}
.compare-after-wrap {
  position: absolute;
  inset: 0;
  clip-path: inset(0 0 0 var(--cmp));
}
.compare-divider {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--cmp);
  width: 2px;
  transform: translateX(-1px);
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.9), rgba(244, 114, 182, 0.9));
  box-shadow: 0 0 14px rgba(167, 139, 250, 0.85);
}
.compare-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 18px;
  color: #04121a;
  background: linear-gradient(100deg, #38e1f8, #ff8ecb);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.5), 0 0 22px rgba(167, 139, 250, 0.55);
  cursor: ew-resize;
  transition: transform 0.15s ease;
}
.compare-handle:hover,
.compare-handle:focus-visible { transform: translate(-50%, -50%) scale(1.12); }
.compare-handle:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.compare-label {
  position: absolute;
  top: 16px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  padding: 6px 13px;
  border-radius: 999px;
  background: rgba(10, 10, 20, 0.55);
  backdrop-filter: blur(6px);
  pointer-events: none;
}
.label-before { left: 16px; color: #c8d4ff; }
.label-after {
  right: 16px;
  color: #ffd9a0;
  border: 1px solid rgba(251, 191, 36, 0.35);
}

/* ---- 四宫格特效一览 ---- */

.grid-showcase {
  margin-top: 84px;
  text-align: center;
}
.grid-title {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  margin-bottom: 30px;
}
.grid-frame {
  position: relative;
  width: min(960px, 94vw);
  margin: 0 auto;
  border-radius: 26px;
  padding: 2px;
  background: linear-gradient(150deg, rgba(34, 211, 238, 0.5), rgba(167, 139, 250, 0.18) 45%, rgba(244, 114, 182, 0.5));
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.55), 0 0 60px rgba(167, 139, 250, 0.16);
}
.grid-frame video {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 1;
  border-radius: 24px;
  background: #000;
  object-fit: cover;
}
.video-hud {
  position: absolute;
  top: 16px; left: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #ffd7dd;
  background: rgba(10, 10, 20, 0.55);
  backdrop-filter: blur(6px);
  border-radius: 999px;
  padding: 6px 13px;
  pointer-events: none;
}
.hud-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #ff4d6d;
  animation: rec-blink 1.2s steps(1) infinite;
}
@keyframes rec-blink { 50% { opacity: 0.15; } }

.showcase-caption {
  margin-top: 26px;
  text-align: center;
  font-size: 13px;
  color: var(--text-faint);
}

/* ---------------- 卡片 ---------------- */

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  transition: transform 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature-card {
  padding: 30px 28px;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--grad);
  opacity: 0;
  transition: opacity 0.3s;
}
.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(167, 139, 250, 0.45);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45), 0 0 36px rgba(167, 139, 250, 0.12);
}
.feature-card:hover::before { opacity: 1; }

.card-icon {
  font-size: 34px;
  margin-bottom: 16px;
  filter: drop-shadow(0 0 14px rgba(120, 160, 255, 0.55));
}
.feature-card h3 { font-size: 19px; font-weight: 800; margin-bottom: 10px; }
.feature-card p { color: var(--text-dim); font-size: 14px; margin-bottom: 18px; }
.card-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--violet);
  background: rgba(167, 139, 250, 0.1);
  border: 1px solid rgba(167, 139, 250, 0.28);
  border-radius: 8px;
  padding: 4px 10px;
}

/* ---------------- 特效库 ---------------- */

.effect-group { margin-bottom: 40px; }
.group-title {
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 18px;
  color: var(--text);
}

.effect-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 14px;
}

.chip {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}
.chip:hover {
  transform: translateY(-4px) scale(1.02);
  border-color: rgba(34, 211, 238, 0.5);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.4), 0 0 24px rgba(34, 211, 238, 0.14);
}
.chip-glow { border-color: rgba(34, 211, 238, 0.4); }

.chip-emoji { font-size: 26px; }
.chip-name { font-size: 14px; font-weight: 700; flex: 1; }

/* ---------------- 激活步骤 ---------------- */

.steps {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}
.step {
  flex: 1 1 260px;
  max-width: 320px;
  text-align: center;
  padding: 34px 26px;
}
.step-num {
  width: 52px; height: 52px;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 900;
  border-radius: 16px;
  background: var(--grad);
  color: #04121a;
  box-shadow: 0 8px 26px rgba(167, 139, 250, 0.4);
}
.step h3 { font-size: 18px; font-weight: 800; margin-bottom: 8px; }
.step p { font-size: 14px; color: var(--text-dim); }
.step-arrow {
  align-self: center;
  font-size: 26px;
  color: var(--text-faint);
}

/* ---------------- 下载 ---------------- */

.download { padding-top: 40px; }
.download-card {
  position: relative;
  text-align: center;
  padding: 72px 40px;
  border-radius: 28px;
  background: linear-gradient(160deg, rgba(34, 211, 238, 0.09), rgba(167, 139, 250, 0.07) 45%, rgba(244, 114, 182, 0.09));
  border: 1px solid rgba(167, 139, 250, 0.3);
  overflow: hidden;
}
.download-glow {
  position: absolute;
  width: 560px; height: 560px;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(167, 139, 250, 0.2), transparent 65%);
  pointer-events: none;
  animation: dl-pulse 4.5s ease-in-out infinite;
}
@keyframes dl-pulse {
  0%, 100% { opacity: 0.65; }
  50% { opacity: 1; }
}
.download-card h2 {
  position: relative;
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 900;
  margin-bottom: 14px;
}
.download-card p {
  position: relative;
  color: var(--text-dim);
  margin-bottom: 34px;
}
.download-card .btn { position: relative; }
.download-meta {
  position: relative;
  display: flex;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  margin-top: 26px;
  font-size: 13px;
  color: var(--text-faint);
}

/* ---------------- 页脚 ---------------- */

/* ---------------- 底部栏：全站统一（居中 logo + 版权行） ---------------- */

.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(148, 163, 255, 0.10);
  padding: 40px 28px;
  text-align: center;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  max-width: 1160px;
  margin: 0 auto;
}
.footer .logo { justify-content: center; }
.footer .logo:hover { transform: none; }   /* 底部 logo 不需要 hover 浮动 */
.footer-copy {
  margin: 0;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

/* ---------------- 滚动显现动画 ---------------- */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.2, 0.65, 0.3, 1), transform 0.7s cubic-bezier(0.2, 0.65, 0.3, 1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

/* ---------------- 响应式 ---------------- */

@media (max-width: 1100px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

/* 顶栏中屏适配：链接/徽标/登录同时出现时宽度不够，提前收起导航链接
   （与 760px 断点同策略，只是阈值上移；语言切换也在链接里，一并隐藏） */
@media (max-width: 1280px) {
  .nav-links { display: none; }
}
/* 登录后顶栏内容变多：隐藏与导航 Download 链接重复的下载 CTA 腾空间 */
.nav-inner.logged-in > a.btn { display: none; }

@media (max-width: 760px) {
  .nav-links { display: none; }
  .section { padding: 72px 20px; }
  .step-arrow { display: none; }
  .hero { padding-top: 120px; }
  .feature-grid { grid-template-columns: 1fr; }
  .showcase-stage { gap: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ============================================================
   在线体验页（demo.html）
   ============================================================ */

.demo-section { padding-top: 120px; }
.demo-section .section-head p b { color: var(--cyan); font-weight: 600; }

.nav-links a.nav-active { color: var(--cyan); }

.demo-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 24px;
  align-items: start;
}

/* ---- 画面区 ---- */

.demo-stage {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--card-border);
  background: #000;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  aspect-ratio: 4 / 3;
}
.demo-stage canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.demo-statusbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
  font-size: 12px;
  color: var(--text-dim);
}
.backend-badge {
  font-family: Consolas, monospace;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: var(--card);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 60%;
}
.backend-badge.gpu { color: var(--cyan); border-color: rgba(34, 211, 238, 0.4); }
.backend-badge.wasm { color: #fbbf24; border-color: rgba(251, 191, 36, 0.4); }

/* ---- 覆盖层 ---- */

#demo-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: rgba(5, 6, 15, 0.88);
  backdrop-filter: blur(6px);
  padding: 24px;
  transition: opacity 0.3s;
}
#demo-overlay.hidden { opacity: 0; pointer-events: none; }
.ov-title { font-size: 22px; font-weight: 700; margin-bottom: 10px; }
.ov-sub { color: var(--text-dim); font-size: 14px; margin-bottom: 22px; line-height: 1.8; }
.ov-warn {
  margin-top: 18px;
  font-size: 12px;
  color: #fbbf24;
  border: 1px solid rgba(251, 191, 36, 0.35);
  background: rgba(251, 191, 36, 0.07);
  border-radius: 10px;
  padding: 8px 14px;
}
.hidden { display: none !important; }

.ov-spinner {
  width: 42px;
  height: 42px;
  margin: 0 auto 18px;
  border-radius: 50%;
  border: 3px solid rgba(34, 211, 238, 0.2);
  border-top-color: var(--cyan);
  animation: ov-spin 0.9s linear infinite;
}
@keyframes ov-spin { to { transform: rotate(360deg); } }

.ov-bar {
  width: min(320px, 80%);
  height: 6px;
  margin: 4px auto 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}
.ov-bar i {
  display: block;
  height: 100%;
  background: var(--grad);
  border-radius: 999px;
  transition: width 0.25s;
}

/* ---- 性能 HUD ---- */

.demo-hud {
  position: absolute;
  right: 10px;
  bottom: 10px;
  font-family: Consolas, monospace;
  font-size: 11px;
  line-height: 1.7;
  color: #d7e0ff;
  background: rgba(5, 6, 15, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  padding: 8px 12px;
  pointer-events: none;
}
.demo-hud:empty { display: none; }
.hud-fps b { color: var(--cyan); font-size: 15px; }
.hud-face { margin-left: 10px; color: var(--text-faint); }
.hud-face.on { color: #34d399; }

/* ---- 控制面板 ---- */

.demo-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  border: 1px solid var(--card-border);
  background: var(--card);
  border-radius: var(--radius);
  padding: 22px;
  position: sticky;
  top: 96px;
}
.demo-group-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: 10px;
}
.demo-val { color: var(--cyan); float: right; font-weight: 600; }

.fx-chips { display: flex; flex-direction: column; gap: 8px; }
.fx-chip {
  display: block;
  width: 100%;
  text-align: left;
  font-family: var(--font);
  font-size: 14px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 10px 14px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
}
.fx-chip:hover { background: rgba(255, 255, 255, 0.09); transform: translateY(-1px); }
.fx-chip.active {
  border-color: var(--cyan);
  background: rgba(34, 211, 238, 0.1);
  box-shadow: 0 0 0 1px rgba(34, 211, 238, 0.35) inset;
}

#fx-strength { width: 100%; accent-color: var(--cyan); }

#res-select {
  width: 100%;
  font-family: var(--font);
  font-size: 14px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 9px 12px;
  outline: none;
}
#res-select option { background: var(--bg-soft); }

.demo-tips {
  font-size: 12px;
  color: var(--text-dim);
  border-top: 1px dashed rgba(255, 255, 255, 0.12);
  padding-top: 14px;
}
.demo-tips b { color: var(--text); font-size: 13px; }
.demo-tips ul { margin: 8px 0 0 18px; }
.demo-tips li { margin-bottom: 4px; }

.demo-dl { text-align: center; }

/* ---- 页脚（在线体验页简化版） ---- */

@media (max-width: 900px) {
  .demo-layout { grid-template-columns: 1fr; }
  .demo-panel { position: static; }
}

/* ============================================================
   图片/视频处理页（process.html / process_en.html）
   ============================================================ */

.proc-section { padding-top: 120px; }

.proc-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px;
  align-items: start;
}

/* ---- 左侧：模式切换 + 上传 + 预览 ---- */

.proc-modes { display: flex; gap: 10px; margin-bottom: 14px; }
.proc-mode {
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 9px 22px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}
.proc-mode:hover { background: rgba(255, 255, 255, 0.09); }
.proc-mode.active {
  color: var(--text);
  border-color: var(--cyan);
  background: rgba(34, 211, 238, 0.1);
}

.proc-dropzone {
  border: 1px dashed rgba(255, 255, 255, 0.22);
  background: var(--card);
  border-radius: var(--radius);
  padding: 42px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.proc-dropzone:hover, .proc-dropzone.drag {
  border-color: var(--cyan);
  background: rgba(34, 211, 238, 0.05);
}
.proc-drop-icon { font-size: 34px; margin-bottom: 10px; }
.proc-drop-title { font-size: 16px; font-weight: 600; }
.proc-drop-hint { font-size: 12px; color: var(--text-faint); margin-top: 6px; }
.proc-file-info {
  margin-top: 12px;
  font-size: 12px;
  color: var(--cyan);
  font-family: Consolas, monospace;
  word-break: break-all;
}

/* ---- 首帧预览（原图 / 效果） ---- */

.proc-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 16px;
}
.proc-preview-item {
  position: relative;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
}
.proc-preview-item canvas { display: block; width: 100%; height: auto; }
.proc-preview-label {
  position: absolute;
  left: 8px;
  top: 8px;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(5, 6, 15, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: var(--text-dim);
}
#proc-out-label { color: var(--cyan); border-color: rgba(34, 211, 238, 0.4); }

/* ---- 状态/进度/错误 ---- */

.proc-statusbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  font-size: 12px;
  color: var(--text-dim);
}
.proc-bar-wrap {
  flex: 0 0 200px;
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}
.proc-bar {
  height: 100%;
  width: 0%;
  background: var(--grad);
  border-radius: 999px;
  transition: width 0.25s;
}
.proc-status { flex: 1; }
.proc-error {
  margin-top: 10px;
  font-size: 13px;
  color: #fca5a5;
  border: 1px solid rgba(248, 113, 113, 0.35);
  background: rgba(248, 113, 113, 0.07);
  border-radius: 10px;
  padding: 8px 14px;
}

.proc-actions { display: flex; gap: 12px; margin-top: 16px; flex-wrap: wrap; }

.proc-video-result { margin-top: 16px; }
.proc-video-player {
  display: block;
  max-width: 100%;
  max-height: 480px;
  border-radius: 12px;
  background: #000;
  box-shadow: 0 0 24px rgba(0,0,0,0.5);
}

/* ---- 右侧：特效选择 + 强度 ---- */

.proc-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  border: 1px solid var(--card-border);
  background: var(--card);
  border-radius: var(--radius);
  padding: 22px;
  position: sticky;
  top: 96px;
}
.proc-fx-groups { display: flex; flex-direction: column; gap: 12px; }
.proc-fx-cat {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--cyan);
  margin-bottom: 6px;
}
.proc-fx-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.proc-fx-row .fx-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  width: auto;
  padding: 8px 10px;
  font-size: 12px;
}
.proc-fx-row .chip-emoji { font-size: 18px; }
.proc-fx-row .chip-name { font-size: 12px; font-weight: 600; }

#fx-strength:disabled { opacity: 0.35; }
.proc-strength-hint { font-size: 12px; color: var(--text-faint); margin-top: 6px; }

.proc-btns { display: flex; flex-direction: column; gap: 12px; }
.proc-btns .btn {
  width: 100%;
  text-align: center;
  font-size: 17px;
  padding: 16px 24px;
  border-radius: 16px;
  letter-spacing: 0.02em;
}

/* 本次处理的积分消耗提示 */
.proc-cost {
  font-size: 13px;
  color: var(--text-dim);
  text-align: center;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px dashed var(--card-border);
  line-height: 1.5;
}
/* 余额不足警示态 */
.proc-cost.warn {
  color: #ff9d9d;
  border-color: rgba(255, 120, 120, 0.45);
  background: rgba(255, 80, 80, 0.08);
}

/* 管线渲染画布：不显示但保留在 DOM（WebGL 上下文建在它上面） */
.proc-offscreen { position: fixed; left: -99999px; top: 0; }

@media (max-width: 900px) {
  .proc-layout { grid-template-columns: 1fr; }
  .proc-panel { position: static; }
}
@media (max-width: 560px) {
  .proc-preview { grid-template-columns: 1fr; }
  .credits-badge { padding: 6px 12px; font-size: 12px; }
  .credits-badge b { font-size: 14px; }
}

/* ---------------- 登录 / 注册 ---------------- */

/* 弹窗打开时锁定背景滚动 */
body.auth-open { overflow: hidden; }

.auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(3, 4, 10, 0.72);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.auth-overlay.hidden { display: none; }

.auth-card {
  position: relative;
  width: 100%;
  max-width: 400px;
  background: var(--bg-soft);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 32px 28px 24px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6), 0 0 40px rgba(167, 139, 250, 0.12);
}

.auth-close {
  position: absolute;
  top: 14px; right: 16px;
  width: 32px; height: 32px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-dim);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.auth-close:hover { background: rgba(255, 255, 255, 0.12); color: var(--text); }

.auth-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 12px;
  padding: 4px;
}
.auth-tab {
  flex: 1;
  padding: 10px 0;
  border: none;
  border-radius: 9px;
  background: transparent;
  color: var(--text-dim);
  font-size: 15px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.auth-tab.active {
  background: var(--card);
  color: var(--text);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

.auth-pane { display: flex; flex-direction: column; gap: 14px; }
.auth-pane.hidden { display: none; }

.auth-input {
  width: 100%;
  padding: 13px 16px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.auth-input::placeholder { color: var(--text-faint); }
.auth-input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
}

.auth-code-row { display: flex; gap: 10px; }
.auth-code-row .auth-input { flex: 1; }
.auth-code-btn {
  flex-shrink: 0;
  padding: 0 16px;
  font-size: 13px;
  white-space: nowrap;
}
.auth-code-btn:disabled { opacity: 0.55; cursor: not-allowed; }

.auth-submit { width: 100%; margin-top: 4px; }
.auth-submit:disabled { opacity: 0.55; cursor: not-allowed; }

/* 本地模拟模式的验证码回显 */
.auth-dev {
  margin-top: 14px;
  padding: 10px 14px;
  border-radius: 10px;
  background: rgba(34, 211, 238, 0.08);
  border: 1px dashed rgba(34, 211, 238, 0.35);
  color: var(--cyan);
  font-size: 13px;
  text-align: center;
  letter-spacing: 0.05em;
}
.auth-dev.hidden { display: none; }

.auth-err {
  margin-top: 14px;
  padding: 10px 14px;
  border-radius: 10px;
  background: rgba(255, 80, 80, 0.10);
  border: 1px solid rgba(255, 120, 120, 0.35);
  color: #ff9d9d;
  font-size: 13px;
  text-align: center;
}
.auth-err.hidden { display: none; }

/* 导航栏登录区 */
.auth-nav-slot {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.auth-login-btn { border: 1px solid rgba(148, 163, 255, 0.35); }
.user-chip {
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(167, 139, 250, 0.12);
  border: 1px solid rgba(167, 139, 250, 0.35);
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
  user-select: none;
}

@media (max-width: 560px) {
  .user-chip { max-width: 88px; }
}