/* ============================================================
   实况工具箱 · Live Photo Tools — Landing Page
   配色：暖色电影感深色（espresso near-black + 蓝紫强调色）
   单一定制：仅深色模式，无浅色切换
   ============================================================ */

/* ---------- 主题变量（暖色电影感深色，唯一主题） ---------- */
:root {
  /* 底色：深暖 espresso / 暖炭灰 */
  --bg: #15100b;
  --bg-soft: #1c1510;
  --bg-rgb: 21, 16, 11;

  /* 卡片 / 玻璃 */
  --card: rgba(255, 238, 214, 0.045);
  --card-border: rgba(255, 226, 190, 0.10);
  --card-hover: rgba(255, 238, 214, 0.085);

  /* 文字：暖白 / 暖灰 */
  --text: #f5ece0;
  --text-dim: #c4b5a1;
  --text-faint: #8d7f6e;

  /* 强调色：蓝紫（在暖底上跳脱、显高级） */
  --primary: #7b6cff;
  --primary-2: #a06bff;
  --grad: linear-gradient(135deg, #5b6cff 0%, #a06bff 100%);
  --grad-text: linear-gradient(110deg, #8ea2ff 0%, #c79bff 50%, #ffd2a6 100%);

  --shadow: 0 24px 60px -18px rgba(0, 0, 0, 0.62);
  --radius: 20px;
  --nav-bg: rgba(21, 16, 11, 0.72);
  --border-hair: rgba(255, 226, 190, 0.10);
  --glass: rgba(255, 238, 214, 0.04);

  /* 氛围光（暖铜 + 紫 + 玫瑰） */
  --glow-1: #6b4a1f;
  --glow-2: #432f6b;
  --glow-3: #5a2f33;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; }
em { font-style: normal; font-weight: 700; color: inherit; }

::selection { background: rgba(123, 108, 255, 0.35); }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-thumb {
  background: var(--grad);
  border-radius: 8px;
}
::-webkit-scrollbar-track { background: var(--bg); }

/* ---------- 背景装饰（暖色氛围光） ---------- */
.bg-fx {
  position: fixed;
  inset: 0;
  z-index: -2;
  overflow: hidden;
  pointer-events: none;
}

.aurora {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px) saturate(0.4);
  opacity: 0.22;
  mix-blend-mode: screen;
  animation: drift 22s ease-in-out infinite alternate;
}

.aurora--1 { width: 55vw; height: 55vw; left: -12vw; top: -18vw; background: var(--glow-1); }
.aurora--2 { width: 45vw; height: 45vw; right: -14vw; top: 8vh; background: var(--glow-2); animation-delay: -7s; animation-duration: 26s; }
.aurora--3 { width: 40vw; height: 40vw; left: 24vw; bottom: -22vh; background: var(--glow-3); animation-delay: -14s; animation-duration: 30s; }

@keyframes drift {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(6vw, 4vh) scale(1.12); }
  100% { transform: translate(-4vw, -3vh) scale(0.94); }
}

.grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border-hair) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-hair) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 70% 55% at 50% 0%, #000 20%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 55% at 50% 0%, #000 20%, transparent 75%);
  opacity: 0.18;
}

#stars { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.5; }

.spotlight {
  position: absolute;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(123, 108, 255, 0.10), transparent 65%);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 0.3s ease;
  will-change: transform;
}
.spotlight.on { opacity: 1; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease, background 0.25s ease;
  will-change: transform;
  white-space: nowrap;
}
.btn:active { transform: scale(0.96); }

.btn--primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 12px 30px -10px rgba(123, 108, 255, 0.55);
}
.btn--primary:hover { box-shadow: 0 18px 40px -10px rgba(123, 108, 255, 0.72); transform: translateY(-2px); }

.btn--ghost {
  background: var(--glass);
  color: var(--text);
  border-color: var(--border-hair);
  backdrop-filter: blur(8px);
}
.btn--ghost:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

.btn--sm { padding: 8px 18px; font-size: 13px; }

.btn__icon { display: inline-block; }
.btn__icon--arrow { transition: transform 0.25s ease; }
.btn--ghost:hover .btn__icon--arrow { transform: translateX(4px); }

.link-arrow { color: var(--text-dim); font-size: 14px; transition: color 0.2s ease; }
.link-arrow:hover { color: var(--primary); }

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: transparent;
  transition: background 0.35s ease, box-shadow 0.35s ease, backdrop-filter 0.35s ease;
}
.nav.is-scrolled {
  background: var(--nav-bg);
  box-shadow: 0 1px 0 var(--border-hair);
}
/* 毛玻璃改由 ::before 承载：避免 .nav 自身带 backdrop-filter 变成其内部
   position:fixed 子元素（#navLinks 菜单面板 / #navScrim 遮罩）的包含块，
   否则下滑后 .nav 加上 .is-scrolled 时，菜单与遮罩会被相对导航条定位而错位 */
.nav.is-scrolled::before {
  content: "";
  position: absolute;
  inset: 0;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  pointer-events: none;
  z-index: -1;
}
.nav__inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.nav__brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.nav__logo { width: 34px; height: 34px; border-radius: 9px; box-shadow: 0 4px 14px -4px rgba(0, 0, 0, 0.5); }
.nav__links { display: flex; gap: 26px; }
.nav__links a {
  font-size: 14px;
  color: var(--text-dim);
  position: relative;
  padding: 4px 0;
  transition: color 0.2s ease;
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  border-radius: 2px;
  background: var(--grad);
  transition: width 0.3s ease;
}
.nav__links a:hover, .nav__links a.active { color: var(--text); }
.nav__links a:hover::after, .nav__links a.active::after { width: 100%; }

.nav__actions { display: flex; align-items: center; gap: 14px; }

.lang-toggle {
  height: 38px;
  padding: 0 12px;
  border-radius: 19px;
  border: 1px solid var(--border-hair);
  background: var(--glass);
  color: inherit;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: transform 0.3s ease, border-color 0.2s ease, color 0.2s ease;
}
.lang-toggle:hover { transform: translateY(-2px); border-color: var(--primary); color: var(--primary); }

.nav__burger {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  border-radius: 50%;
  background: var(--glass);
  border: 1px solid var(--border-hair);
  padding: 0;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}
.nav__burger:hover { border-color: var(--primary); }
.nav__burger:active { transform: scale(0.92); }
.nav__burger span { width: 20px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.3s ease; }
.nav__burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- HERO（首屏：<img> 承载场景图） ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 120px 24px 80px;
  overflow: hidden;
  isolation: isolate;
}

/* 关键修复：用 <img> 而非 CSS background-image（后者在本环境不渲染） */
.hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 66% 42%;
  z-index: 0;
}

/* 遮罩：左 / 顶 / 底渐变为主题底色，保证文字可读 */
.hero__overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(90deg, var(--bg) 0%, rgba(var(--bg-rgb), 0.88) 22%, rgba(var(--bg-rgb), 0.25) 52%, transparent 68%),
    linear-gradient(180deg, var(--bg) 0%, transparent 22%),
    linear-gradient(0deg, var(--bg) 0%, transparent 28%);
}

.hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
}
.hero__content { max-width: 660px; text-align: left; }

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--text-dim);
  background: var(--glass);
  border: 1px solid var(--border-hair);
  backdrop-filter: blur(8px);
  margin-bottom: 26px;
}
.pulse-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6);
  animation: pulse 2.2s ease-out infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.55); }
  70%  { box-shadow: 0 0 0 9px rgba(52, 211, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}

.hero__title { margin-bottom: 22px; }
.hero__title-main {
  display: block;
  font-size: clamp(44px, 8vw, 76px);
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--text);
  text-shadow: 0 2px 26px rgba(0, 0, 0, 0.45), 0 1px 4px rgba(0, 0, 0, 0.3);
}
.hero__title-en {
  display: block;
  margin-top: 8px;
  font-size: clamp(16px, 2.4vw, 22px);
  font-weight: 500;
  color: var(--text-dim);
  letter-spacing: 3px;
  min-height: 1.6em;
}
.hero__title-en .caret {
  display: inline-block;
  width: 2px;
  height: 1em;
  margin-left: 4px;
  vertical-align: -0.12em;
  background: var(--primary);
  animation: blink 0.85s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero__sub {
  max-width: 620px;
  font-size: clamp(15px, 2vw, 18px);
  color: var(--text-dim);
  margin-bottom: 38px;
}

.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; justify-content: flex-start; margin-bottom: 56px; }

.hero__tools {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
}
.hero__tool {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px 10px 12px;
  border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--border-hair);
  backdrop-filter: blur(8px);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.hero__tool:hover {
  transform: translateY(-3px);
  border-color: rgba(160, 107, 255, 0.55);
  box-shadow: 0 10px 24px -8px rgba(123, 108, 255, 0.4);
}
.hero__tool-ico {
  display: grid;
  place-items: center;
  width: 30px; height: 30px;
  border-radius: 9px;
  font-size: 16px;
  background: linear-gradient(135deg, var(--c1, #7b6cff), var(--c2, #a06bff));
  box-shadow: 0 4px 12px -3px rgba(0, 0, 0, 0.35);
}
.hero__tool-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.5px;
}

.hero__scroll {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0.7;
  transition: opacity 0.2s ease;
  z-index: 2;
}
.hero__scroll:hover { opacity: 1; }
.hero__scroll-mouse {
  display: block;
  width: 24px; height: 38px;
  border: 2px solid var(--text-dim);
  border-radius: 14px;
  position: relative;
}
.hero__scroll-wheel {
  position: absolute;
  top: 7px; left: 50%;
  width: 4px; height: 8px;
  margin-left: -2px;
  border-radius: 4px;
  background: var(--primary);
  animation: wheel 1.8s ease infinite;
}
@keyframes wheel {
  0%   { transform: translateY(0); opacity: 1; }
  70%  { transform: translateY(12px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}

/* ---------- Section 通用 ---------- */
.section { max-width: 1120px; margin: 0 auto; padding: 110px 24px; }
.section--alt {
  max-width: none;
  background: var(--bg-soft);
  border-top: 1px solid var(--border-hair);
  border-bottom: 1px solid var(--border-hair);
}
.section--alt .section__inner { max-width: 1120px; margin: 0 auto; }

.section__head { text-align: center; margin-bottom: 56px; }
.section__tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary);
  background: rgba(123, 108, 255, 0.1);
  border: 1px solid rgba(123, 108, 255, 0.25);
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.section__title { font-size: clamp(26px, 4vw, 38px); font-weight: 800; margin-bottom: 10px; }
.section__desc { color: var(--text-dim); font-size: 15px; }

/* ---------- 工具箱 ---------- */
.toolbox {
  position: relative;
  width: min(900px, 100%);
  margin: 0 auto 44px;
  perspective: 1400px;
}

.toolbox__lid {
  position: relative;
  z-index: 6;
  width: 76%;
  height: 44px;
  margin: 0 auto;
  border-radius: 14px 14px 8px 8px;
  background: linear-gradient(180deg, #2a2018, #1a130d);
  border: 1px solid var(--border-hair);
  box-shadow: 0 16px 34px -14px rgba(0, 0, 0, 0.65);
  transform-origin: 50% 100%;
  transition: transform 0.65s cubic-bezier(0.34, 1.45, 0.64, 1), opacity 0.45s ease;
}
.toolbox__lid::before {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 72px; height: 13px;
  border-radius: 9px;
  background: var(--grad);
  box-shadow: 0 4px 12px -4px rgba(123, 108, 255, 0.7);
}
.toolbox.is-open .toolbox__lid {
  transform: rotateX(52deg) translateY(-30px) scale(1.05);
  opacity: 0.55;
}

.toolbox__body {
  position: relative;
  z-index: 2;
  margin-top: -10px;
  height: 258px;
  border-radius: 22px;
  background: linear-gradient(180deg, #211913, #15100b);
  border: 1px solid var(--border-hair);
  box-shadow:
    inset 0 30px 60px -26px rgba(0, 0, 0, 0.85),
    0 34px 70px -28px rgba(0, 0, 0, 0.6);
}
.toolbox__body::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 62% 85% at 50% 10%, rgba(160, 107, 255, 0.28), transparent 62%);
  pointer-events: none;
}
.toolbox__body::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -14px;
  transform: translateX(-50%);
  width: 64%;
  height: 34px;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(123, 108, 255, 0.3), transparent 70%);
  filter: blur(8px);
  pointer-events: none;
}

.tool {
  position: absolute;
  z-index: 7;
  left: 50%;
  bottom: 18px;
  width: 222px;
  padding: 22px 20px;
  border-radius: 18px;
  background: var(--card);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  text-align: center;
  opacity: 0;
  transform: translateY(10px) scale(0.9);
  transition:
    transform 0.75s cubic-bezier(0.34, 1.56, 0.64, 1),
    opacity 0.55s ease;
}
.tool--1 { margin-left: -377px; transition-delay: 0.1s; }
.tool--2 { margin-left: -111px; transition-delay: 0.28s; }
.tool--3 { margin-left: 155px; transition-delay: 0.46s; }

.toolbox.is-open .tool {
  opacity: 1;
  transform: translateY(-12px) scale(1);
}

.tool__icon {
  display: grid;
  place-items: center;
  width: 52px; height: 52px;
  margin: 0 auto 14px;
  border-radius: 15px;
  font-size: 24px;
  background: linear-gradient(135deg, var(--c1, #7b6cff), var(--c2, #a06bff));
  box-shadow: 0 10px 22px -8px rgba(0, 0, 0, 0.4);
}
.tool__title { font-size: 18px; font-weight: 800; margin-bottom: 6px; color: var(--text); }
.tool__text { font-size: 13px; color: var(--text-dim); line-height: 1.55; }

/* 工具箱指示器（移动端层叠切换） */
.toolbox__dots {
  display: none;
  justify-content: center;
  gap: 8px;
  margin-top: 14px;
}
.toolbox__dot {
  width: 8px; height: 8px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--text-dim);
  opacity: 0.45;
  cursor: pointer;
  transition: width 0.3s ease, opacity 0.3s ease, background 0.3s ease;
}
.toolbox__dot.is-active {
  width: 24px;
  border-radius: 4px;
  opacity: 1;
  background: var(--primary, #7b6cff);
}

/* 工具箱下方辅助特性 */
.features-sub {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 0 0 40px; /* 与下方工具箱拉开距离 */
}
/* 收窄描述与标签间距，让三颗气泡更贴近「合成、提取、编辑…」 */
#features .section__head { margin-bottom: 22px; }
.sub-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--text-dim);
  background: var(--glass);
  border: 1px solid var(--border-hair);
  backdrop-filter: blur(8px);
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.sub-chip:hover {
  transform: translateY(-2px);
  border-color: rgba(160, 107, 255, 0.5);
  color: var(--text);
}

/* ---------- 界面预览（三张带壳截屏） ---------- */
.screens {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(20px, 4vw, 44px);
  max-width: 980px;
  margin: 72px auto 0;
}
.screen {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.screen img {
  width: min(100%, 300px);
  filter: drop-shadow(0 24px 60px rgba(0, 0, 0, 0.45));
  animation: screen-bob 6.5s ease-in-out infinite;
}
.screen:nth-child(2) img { animation-delay: -2.2s; }
.screen:nth-child(3) img { animation-delay: -4.4s; }
.screen figcaption {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--text-dim);
}
@keyframes screen-bob {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}

@media (max-width: 860px) {
  /* 手机端：三张截屏改为与上方三个状态（工具箱）联动的轮播，自动切换 + 左右滑动 */
  .screens {
    position: relative;
    display: block;
    height: 660px;
    margin: 48px auto 0;
    overflow: hidden;
  }
  .screen {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    opacity: 0;
    transform: translateX(24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
    pointer-events: none;
  }
  .screen.reveal, .screen.reveal.is-visible { opacity: 0; transform: translateY(0); }
  .screen.is-active { opacity: 1 !important; transform: none !important; pointer-events: auto; }
  .screen img { width: min(78%, 280px); animation: none; }
}

/* ---------- 功能卡片 ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
}

.card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 30px 28px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  transform-style: preserve-3d;
  will-change: transform;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 0%), rgba(123, 108, 255, 0.12), transparent 40%);
  opacity: 0;
  transition: opacity 0.35s ease;
  pointer-events: none;
}
.card:hover {
  background: var(--card-hover);
  border-color: rgba(123, 108, 255, 0.35);
  box-shadow: var(--shadow);
}
.card:hover::before { opacity: 1; }

.card__icon {
  width: 58px; height: 58px;
  display: grid;
  place-items: center;
  font-size: 27px;
  border-radius: 16px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  box-shadow: 0 10px 24px -8px var(--c2);
  transform: translateZ(30px);
}
.card__title { font-size: 19px; font-weight: 700; margin-bottom: 10px; transform: translateZ(20px); }
.card__text { font-size: 14px; color: var(--text-dim); transform: translateZ(12px); }

/* ---------- 下载 ---------- */
.download { display: flex; justify-content: center; }
.download__card {
  width: min(640px, 100%);
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 34px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.download__card::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -20%;
  width: 140%;
  height: 90%;
  background: radial-gradient(ellipse at top, rgba(123, 108, 255, 0.14), transparent 60%);
  pointer-events: none;
}
.download__head { display: flex; gap: 18px; align-items: center; margin-bottom: 26px; position: relative; }
.download__icon { width: 64px; height: 64px; border-radius: 16px; box-shadow: 0 12px 28px -8px rgba(0, 0, 0, 0.55); }
.download__name { font-size: 20px; font-weight: 800; }
.download__ver {
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  background: var(--grad);
  padding: 2px 10px;
  border-radius: 999px;
  vertical-align: 2px;
  margin-left: 4px;
}
.download__meta { font-size: 13px; color: var(--text-faint); margin-top: 2px; }

.download__body { display: flex; flex-direction: column; gap: 14px; position: relative; }
.download__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  border-radius: 14px;
  background: var(--glass);
  border: 1px solid var(--border-hair);
  font-size: 14px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.download__row:hover { border-color: rgba(123, 108, 255, 0.4); transform: translateX(4px); }

.download__foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
  position: relative;
}

/* ---------- 兼容性 ---------- */
.compat {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
  margin-bottom: 20px;
}
.compat__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 26px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  background: var(--card);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s ease, border-color 0.3s ease;
}
.compat__item:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.compat__item--ok { border-top: 3px solid #34d399; }
.compat__item--partial { border-top: 3px solid #f59e0b; }
.compat__status { font-size: 13px; font-weight: 700; }
.compat__item--ok .compat__status { color: #34d399; }
.compat__item--partial .compat__status { color: #f59e0b; }
.compat__dev { font-size: 17px; font-weight: 700; }
.compat__model { font-size: 13px; color: var(--text-faint); }
.compat__note { text-align: center; font-size: 13px; color: var(--text-faint); max-width: 720px; margin: 0 auto; }

/* ---------- 技术栈 ---------- */
.stack { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; max-width: 760px; margin: 0 auto; }
.chip {
  padding: 10px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  background: var(--card);
  border: 1px solid var(--card-border);
  color: var(--text-dim);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.chip:hover {
  color: #fff;
  background: var(--grad);
  border-color: transparent;
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 12px 24px -8px rgba(123, 108, 255, 0.5);
}

/* ---------- FAQ ---------- */
.faq { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq__item {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  overflow: hidden;
  transition: border-color 0.3s ease;
}
.faq__item[open] { border-color: rgba(123, 108, 255, 0.4); }
.faq__item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 20px 24px;
  font-weight: 600;
  font-size: 15px;
  user-select: none;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__plus {
  width: 26px; height: 26px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 15px;
  color: var(--primary);
  background: rgba(123, 108, 255, 0.1);
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.faq__item[open] .faq__plus { transform: rotate(45deg); }
.faq__item p {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-dim);
  animation: faq-in 0.35s ease;
}
@keyframes faq-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border-hair);
  background: var(--bg-soft);
  padding: 46px 24px 30px;
}
.footer__inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 26px;
}
.footer__brand { display: flex; align-items: center; gap: 14px; }
.footer__logo { width: 40px; height: 40px; border-radius: 10px; }
.footer__name { font-weight: 700; font-size: 15px; }
.footer__license { font-size: 12px; color: var(--text-faint); }
.footer__links { display: flex; gap: 22px; flex-wrap: wrap; }
.footer__links a { font-size: 14px; color: var(--text-dim); transition: color 0.2s ease; }
.footer__links a:hover { color: var(--primary); }
.footer__made { text-align: center; font-size: 13px; color: var(--text-faint); }

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 46px; height: 46px;
  border-radius: 50%;
  border: 1px solid var(--border-hair);
  background: var(--glass);
  color: var(--text);
  font-size: 19px;
  backdrop-filter: blur(10px);
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease, border-color 0.2s ease;
  z-index: 90;
}
.back-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-top:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* ---------- 滚动渐显 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: calc(var(--d, 0) * 0.1s);
  will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ---------- 移动端 ---------- */
@media (max-width: 860px) {
  /* 折叠菜单：从顶栏正下方下拉，仅占屏幕上半部（顶 50%），带底部阴影 */
  .nav__links {
    position: fixed;
    top: 70px; left: 0; right: 0;
    height: calc(50vh - 70px);
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    gap: 4px;
    padding: 18px 24px 24px;
    background: var(--nav-bg);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border-hair);
    box-shadow: 0 24px 50px rgba(0, 0, 0, 0.5);
    /* 收起时整体移出屏幕（面板高度 + 顶栏偏移 + 余量），避免底部残边盖住顶栏 */
    transform: translateY(calc(-100% - 86px));
    transition: transform 0.42s cubic-bezier(0.22, 1, 0.36, 1);
    z-index: 99;
  }
  .nav__links.is-open { transform: translateY(0); }
  .nav__links a {
    font-size: 17px;
    padding: 14px 4px;
    border-bottom: 1px solid var(--border-hair);
  }
  .nav__links a::after { display: none; }

  /* 遮罩：菜单打开后覆盖屏幕下半部（底 50%），做高斯模糊 + 压暗 */
  .nav__scrim {
    position: fixed;
    left: 0; right: 0; bottom: 0;
    height: 50vh;
    background: rgba(0, 0, 0, 0.5);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease;
    z-index: 98;
  }
  .nav__scrim.is-active { opacity: 1; pointer-events: auto; }
  .nav__burger { display: flex; }
  .nav__cta { display: none; }
  .nav__brand { min-width: 0; }
  .nav__name {
    font-size: 15px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 46vw;
  }
  .nav__actions { gap: 8px; }
  .lang-toggle { padding: 0 10px; }

  .hero { padding-top: 96px; padding-bottom: 0; align-items: flex-start; }
  .hero__content { text-align: center; max-width: 100%; }
  .hero__title { margin-bottom: 16px; }
  .hero__title-main { font-size: clamp(34px, 9vw, 52px); }
  .hero__sub { margin-bottom: 28px; }
  .hero__actions { justify-content: center; margin-bottom: 0; }
  .hero__tools { display: none; }

  /* 手机端：场景图拉高为底部大图带，顶部全黑、向下渐隐到亮图，自然过渡到文字/按钮区；向左裁切、保留右侧 UI 重心 */
  .hero__bg {
    top: auto;
    bottom: 0;
    height: 60%;
    object-fit: cover;
    object-position: right 55%;
  }
  .hero__overlay {
    background:
      linear-gradient(180deg, #000 0%, #000 40%, transparent 85%);
  }

  .section { padding: 80px 20px; }
  .toolbox__lid { width: 84%; }
  .toolbox__body { height: 300px; }
  .toolbox__body::after { display: none; }
  .tool {
    position: absolute;
    left: 50%;
    bottom: 16px;
    width: min(330px, 86%);
    margin: 0;
    padding: 22px 20px;
    text-align: center;
    transform: translateX(-50%) translateY(28px);
    z-index: 7;
  }
  .tool--1, .tool--2, .tool--3 { transition-delay: 0s; }
  .toolbox.is-open .tool {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
  }
  .toolbox.is-open .tool.is-stack {
    transform: translateX(-50%) translateY(12px) scale(0.93);
    opacity: 0.3;
    z-index: 6;
  }
  .tool.is-active { z-index: 8; }
  .toolbox__dots {
    display: flex;
    position: absolute;
    left: 0; right: 0;
    bottom: -30px;
    margin-top: 0;
    z-index: 9;
  }
  .tool__icon { margin: 0 auto 14px; }
  .tool__title { margin-bottom: 6px; }
  .features { grid-template-columns: 1fr; }
  .download__card { padding: 26px 22px; }
  .download__row { flex-direction: column; align-items: flex-start; }
  .download__foot { flex-direction: column; gap: 10px; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
}

/* ---------- 减少动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}