/* ==========================================================
   一起看影视 介绍页样式
   配色取自 App Logo：纯黑底 + 红色场记板（亮红 → 深红渐变）
   ========================================================== */

:root {
  --bg: #0a0a0c;
  --bg-soft: #101014;
  --bg-alt: #0d0d10;
  --card: #15151a;
  --card-hover: #1b1b22;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);

  --red: #ff3344;
  --red-bright: #ff4d5e;
  --red-deep: #d81128;
  --red-dark: #8c1622;
  --gradient: linear-gradient(135deg, #ff4d5e 0%, #e1142c 55%, #b40c20 100%);
  --gradient-soft: linear-gradient(135deg, rgba(255, 77, 94, 0.18), rgba(180, 12, 32, 0.08));

  --text: #f4f4f7;
  --muted: #a3a3ae;
  --muted-2: #74747f;

  --radius: 18px;
  --header-h: 72px;
  --shadow-red: 0 18px 50px -12px rgba(224, 20, 44, 0.55);
  --ease: cubic-bezier(0.22, 0.9, 0.28, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: rgba(224, 20, 44, 0.55); color: #fff; }

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: #0b0b0e; }
::-webkit-scrollbar-thumb { background: #2b2b33; border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: #c41228; }

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.container { width: min(1180px, 92%); margin: 0 auto; }
.container-narrow { width: min(860px, 92%); }

section[id] { scroll-margin-top: calc(var(--header-h) + 14px); }

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

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: 0.5px;
  white-space: nowrap;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background 0.3s, border-color 0.3s;
  will-change: transform;
}
.btn svg { width: 20px; height: 20px; }

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 14px 36px -10px rgba(224, 20, 44, 0.65), inset 0 1px 0 rgba(255, 255, 255, 0.22);
  position: relative;
  overflow: hidden;
}
.btn-primary::after {
  content: "";
  position: absolute;
  top: 0; left: -80%;
  width: 50%; height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.28), transparent);
  transform: skewX(-20deg);
  transition: left 0.6s ease;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 22px 50px -10px rgba(224, 20, 44, 0.8); }
.btn-primary:hover::after { left: 130%; }
.btn-primary:active { transform: translateY(-1px) scale(0.98); }

.btn-ghost {
  border: 1px solid var(--line-strong);
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}
.btn-ghost:hover { border-color: var(--red); color: var(--red-bright); transform: translateY(-3px); }

.btn-lg { padding: 15px 34px; font-size: 16.5px; }
.btn-xl { padding: 19px 58px; font-size: 19px; }

/* ==========================================================
   顶部导航
   ========================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  z-index: 100;
  transition: background 0.35s, border-color 0.35s, backdrop-filter 0.35s;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(10, 10, 12, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--line);
}
.nav-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo {
  width: 42px; height: 42px;
  border-radius: 12px;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  /* 占位底图：填入 src 后自动覆盖 */
  background-color: #141418;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M8 5.5v13a1 1 0 0 0 1.54.84l10-6.5a1 1 0 0 0 0-1.68l-10-6.5A1 1 0 0 0 8 5.5z' fill='%23ff3344'/%3E%3C/svg%3E"),
                    linear-gradient(150deg, #202026, #0c0c0f);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 58%, cover;
  color: transparent;
  font-size: 0;
  flex-shrink: 0;
}
.brand-name { font-size: 19px; font-weight: 800; letter-spacing: 1px; }
.brand-name b { color: var(--red-bright); font-weight: 800; }

.main-nav { display: flex; align-items: center; gap: 6px; }
.nav-link {
  padding: 8px 16px;
  font-size: 15px;
  color: var(--muted);
  border-radius: 999px;
  transition: color 0.25s, background 0.25s;
}
.nav-link:hover { color: #fff; }
.nav-link.active { color: #fff; background: rgba(255, 255, 255, 0.07); }
.nav-btn {
  margin-left: 10px;
  padding: 10px 24px;
  font-size: 14.5px;
  font-weight: 700;
  color: #fff;
  border-radius: 999px;
  background: var(--gradient);
  box-shadow: 0 8px 24px -8px rgba(224, 20, 44, 0.7);
  transition: transform 0.3s var(--ease), box-shadow 0.3s;
}
.nav-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 30px -8px rgba(224, 20, 44, 0.9); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span {
  width: 24px; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================
   首屏 Hero
   ========================================================== */
.hero {
  position: relative;
  padding: calc(var(--header-h) + 70px) 0 90px;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.glow { position: absolute; border-radius: 50%; filter: blur(120px); opacity: 0.5; }
.glow-1 {
  width: 560px; height: 560px;
  top: -200px; left: -160px;
  background: radial-gradient(circle, rgba(224, 20, 44, 0.35), transparent 65%);
}
.glow-2 {
  width: 620px; height: 620px;
  bottom: -280px; right: -180px;
  background: radial-gradient(circle, rgba(140, 22, 34, 0.45), transparent 65%);
}
.grid-mask {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 75%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 50px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  border-radius: 999px;
  font-size: 13.5px;
  color: #ffd7dc;
  background: rgba(224, 20, 44, 0.12);
  border: 1px solid rgba(255, 60, 80, 0.3);
}
.hero-badge .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--red-bright);
  box-shadow: 0 0 0 4px rgba(255, 60, 80, 0.18);
  animation: pulse 1.8s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(255, 60, 80, 0.18); }
  50% { box-shadow: 0 0 0 7px rgba(255, 60, 80, 0.05); }
}
.hero-badge-light { color: #ffe4e7; }

.hero-title {
  margin: 22px 0 18px;
  font-size: clamp(32px, 4.4vw, 52px);
  line-height: 1.22;
  font-weight: 900;
  letter-spacing: 1px;
}
.hero-desc {
  color: var(--muted);
  font-size: 16.5px;
  max-width: 560px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 28px 0 32px;
}
.meta-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
}
.meta-item svg { width: 22px; height: 22px; color: var(--red-bright); flex-shrink: 0; }
.meta-label { display: block; font-size: 12px; color: var(--muted-2); line-height: 1.3; }
.meta-value { display: block; font-size: 15.5px; font-weight: 700; color: #fff; line-height: 1.4; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; }

.hero-stats {
  display: flex;
  gap: 38px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.hero-stats strong { display: block; font-size: 26px; font-weight: 800; color: var(--red-bright); }
.hero-stats span { font-size: 13.5px; color: var(--muted-2); }

/* ---------- 首屏截图：三机叠加，悬停/点按置顶查看 ---------- */
.hero-visual { display: flex; justify-content: center; }
.shots {
  position: relative;
  width: 540px;
  height: 560px;
}
.shot {
  position: absolute;
  top: 36px;
  width: 248px;
  height: 500px;
  cursor: pointer;
  transition: transform 0.6s var(--ease), opacity 0.45s, filter 0.45s;
  outline: none;
}
.shot[data-shot="0"] { left: 0; z-index: 1; transform: rotate(-9deg) scale(0.9) translateY(20px); }
.shot[data-shot="1"] { left: 50%; margin-left: -124px; z-index: 3; transform: translateY(-8px) scale(1); }
.shot[data-shot="2"] { right: 0; z-index: 1; transform: rotate(9deg) scale(0.9) translateY(20px); }

.shot-frame {
  position: absolute;
  inset: 0;
  padding: 9px;
  border-radius: 36px;
  background: linear-gradient(160deg, #2a2a32, #0d0d11);
  border: 1px solid var(--line-strong);
  box-shadow: 0 26px 60px rgba(0, 0, 0, 0.65);
  transition: box-shadow 0.5s, border-color 0.5s;
  overflow: hidden;
}
.shot-frame::after {
  content: "";
  position: absolute;
  top: 16px; left: 50%;
  transform: translateX(-50%);
  width: 74px; height: 16px;
  border-radius: 0 0 12px 12px;
  background: #060608;
  z-index: 2;
}
.shot-frame img {
  width: 100%; height: 100%;
  border-radius: 28px;
  object-fit: cover;
  /* 截图占位底图：填入 src 后自动覆盖 */
  background-color: #15151b;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Crect x='3' y='5' width='18' height='14' rx='2.5' fill='none' stroke='%23ff3344' stroke-width='1.4'/%3E%3Cpath d='M3 9.5h18M8 5v14M16 5v14' stroke='%23ff3344' stroke-width='1.2' opacity='0.7'/%3E%3C/svg%3E"),
                    linear-gradient(160deg, #202029 0%, #0e0e12 100%);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 30%, cover;
  color: transparent;
  font-size: 0;
}

.shot-tag {
  position: absolute;
  left: 50%; bottom: 26px;
  transform: translateX(-50%) translateY(8px);
  padding: 7px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  color: #fff;
  background: rgba(0, 0, 0, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  transition: opacity 0.4s, transform 0.4s;
  z-index: 3;
  pointer-events: none;
}

/* 激活的截图置顶、居中放大展示 */
.shot.is-active { z-index: 6; }
.shot[data-shot="0"].is-active { transform: rotate(0) scale(1.06) translateY(-26px) translateX(72px); }
.shot[data-shot="1"].is-active { transform: scale(1.06) translateY(-26px); }
.shot[data-shot="2"].is-active { transform: rotate(0) scale(1.06) translateY(-26px) translateX(-72px); }
.shot.is-active .shot-frame {
  border-color: rgba(255, 60, 80, 0.45);
  box-shadow: 0 34px 90px -12px rgba(224, 20, 44, 0.45), 0 18px 50px rgba(0, 0, 0, 0.7);
}
.shot.is-active .shot-tag { opacity: 1; transform: translateX(-50%) translateY(0); }

/* 悬停容器时，非激活截图压暗 */
.shots:hover .shot:not(.is-active),
.shots:focus-within .shot:not(.is-active) { opacity: 0.55; filter: brightness(0.65) saturate(0.8); }
.shots:hover .shot:not(.is-active):hover { opacity: 1; filter: none; }
.shot:focus-visible .shot-frame { border-color: var(--red-bright); }

.shots-hint {
  position: absolute;
  bottom: -6px; left: 50%;
  transform: translateX(-50%);
  font-size: 13px;
  color: var(--muted-2);
  white-space: nowrap;
}

/* ==========================================================
   通用 Section
   ========================================================== */
.section { padding: 108px 0; position: relative; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-head { text-align: center; max-width: 680px; margin: 0 auto 60px; }
.section-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 4px;
  color: var(--red-bright);
  margin-bottom: 14px;
}
.section-title { font-size: clamp(26px, 3.2vw, 38px); font-weight: 900; letter-spacing: 0.5px; }
.section-sub { margin-top: 14px; color: var(--muted); font-size: 16px; }

/* ---------- 功能卡片 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  padding: 36px 30px;
  border-radius: var(--radius);
  background: linear-gradient(165deg, var(--card) 0%, #121217 100%);
  border: 1px solid var(--line);
  transition: transform 0.4s var(--ease), border-color 0.4s, box-shadow 0.4s, background 0.4s;
}
.feature-card:hover {
  transform: translateY(-8px);
  border-color: rgba(255, 60, 80, 0.4);
  background: linear-gradient(165deg, var(--card-hover) 0%, #141015 100%);
  box-shadow: 0 26px 60px -24px rgba(224, 20, 44, 0.45);
}
.feature-icon {
  width: 56px; height: 56px;
  border-radius: 15px;
  display: grid;
  place-items: center;
  margin-bottom: 22px;
  background: var(--gradient-soft);
  border: 1px solid rgba(255, 60, 80, 0.28);
}
.feature-icon svg { width: 27px; height: 27px; color: var(--red-bright); }
.feature-card h3 { font-size: 19.5px; font-weight: 800; margin-bottom: 10px; }
.feature-card p { color: var(--muted); font-size: 14.8px; }

/* ---------- 用户评价 ---------- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review-card {
  padding: 30px;
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--line);
  transition: transform 0.4s var(--ease), border-color 0.4s, box-shadow 0.4s;
}
.review-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 60, 80, 0.35);
  box-shadow: 0 24px 56px -26px rgba(224, 20, 44, 0.5);
}
.review-head { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; }
.avatar {
  width: 46px; height: 46px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 19px;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.35);
}
.avatar-red { background: linear-gradient(135deg, #ff5a68, #c41228); }
.avatar-orange { background: linear-gradient(135deg, #ff9a3d, #e04a12); }
.avatar-gold { background: linear-gradient(135deg, #ffc24b, #e0810f); }
.avatar-rose { background: linear-gradient(135deg, #ff6b9d, #d41756); }
.avatar-crimson { background: linear-gradient(135deg, #e8354f, #8c1622); }
.avatar-dark { background: linear-gradient(135deg, #5b5b66, #23232b); }

.review-head h4 { font-size: 16px; font-weight: 700; }
.stars { color: #ffb02e; font-size: 14px; letter-spacing: 2px; margin-top: 2px; }
.review-card p { color: var(--muted); font-size: 14.8px; }

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  border-radius: 15px;
  background: var(--card);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: border-color 0.3s;
}
.faq-item.open { border-color: rgba(255, 60, 80, 0.38); }
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 22px 26px;
  font-size: 16.5px;
  font-weight: 700;
  text-align: left;
  color: #fff;
}
.faq-icon {
  position: relative;
  width: 16px; height: 16px;
  flex-shrink: 0;
}
.faq-icon::before, .faq-icon::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  background: var(--red-bright);
  border-radius: 2px;
  transform: translate(-50%, -50%);
  transition: transform 0.35s var(--ease);
}
.faq-icon::before { width: 16px; height: 2px; }
.faq-icon::after { width: 2px; height: 16px; }
.faq-item.open .faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); opacity: 0; }

.faq-a { max-height: 0; transition: max-height 0.45s var(--ease); }
.faq-a p { padding: 0 26px 24px; color: var(--muted); font-size: 15.2px; }

/* ==========================================================
   下载区域
   ========================================================== */
.download-section { position: relative; padding: 120px 0; overflow: hidden; }
.glow-3 {
  width: 700px; height: 420px;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse, rgba(224, 20, 44, 0.32), transparent 65%);
  filter: blur(90px);
}
.download-card {
  position: relative;
  z-index: 1;
  max-width: 880px;
  margin: 0 auto;
  text-align: center;
  padding: 70px 48px 60px;
  border-radius: 28px;
  background:
    radial-gradient(ellipse 90% 70% at 50% 0%, rgba(224, 20, 44, 0.14), transparent 70%),
    linear-gradient(170deg, #18181e 0%, #101014 100%);
  border: 1px solid rgba(255, 60, 80, 0.25);
  box-shadow: 0 40px 120px -40px rgba(224, 20, 44, 0.55);
}
.download-logo {
  width: 88px; height: 88px;
  margin: 0 auto 24px;
  border-radius: 24px;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  background-color: #141418;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M8 5.5v13a1 1 0 0 0 1.54.84l10-6.5a1 1 0 0 0 0-1.68l-10-6.5A1 1 0 0 0 8 5.5z' fill='%23ff3344'/%3E%3C/svg%3E"),
                    linear-gradient(150deg, #202026, #0c0c0f);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 58%, cover;
  color: transparent;
  font-size: 0;
}
.download-title { font-size: clamp(26px, 3.4vw, 40px); font-weight: 900; margin: 20px 0 14px; }
.download-desc { color: var(--muted); font-size: 16px; }
.download-meta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 38px;
}
.download-meta span {
  padding: 7px 18px;
  font-size: 13.5px;
  color: #d6d6de;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
}
.btn-download svg { width: 22px; height: 22px; }
.download-tip { margin-top: 20px; font-size: 13.5px; color: var(--muted-2); }

/* ==========================================================
   页脚
   ========================================================== */
.site-footer {
  border-top: 1px solid var(--line);
  background: #08080a;
  padding: 54px 0 26px;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: 14px; }
.footer-logo { width: 46px; height: 46px; }
.footer-name { font-size: 18px; font-weight: 800; }
.footer-name b { color: var(--red-bright); }
.footer-slogan { font-size: 13.5px; color: var(--muted-2); }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px; }
.footer-links a {
  padding: 6px 14px;
  font-size: 14px;
  color: var(--muted);
  border-radius: 999px;
  transition: color 0.25s, background 0.25s;
}
.footer-links a:hover { color: #fff; background: rgba(255, 255, 255, 0.07); }
.footer-bottom {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  text-align: center;
}
.footer-bottom p { font-size: 13px; color: var(--muted-2); }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 26px; bottom: 26px;
  width: 48px; height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--gradient);
  box-shadow: 0 12px 30px -8px rgba(224, 20, 44, 0.7);
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
  transition: opacity 0.3s, transform 0.3s;
  z-index: 90;
}
.back-top svg { width: 22px; height: 22px; color: #fff; }
.back-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-top:hover { transform: translateY(-3px); }

/* ---------- 滚动出现动画 ---------- */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.75s var(--ease), transform 0.75s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.feature-card:nth-child(2), .review-card:nth-child(2) { transition-delay: 0.08s; }
.feature-card:nth-child(3), .review-card:nth-child(3) { transition-delay: 0.16s; }
.feature-card:nth-child(4), .review-card:nth-child(4) { transition-delay: 0.08s; }
.feature-card:nth-child(5), .review-card:nth-child(5) { transition-delay: 0.16s; }
.feature-card:nth-child(6), .review-card:nth-child(6) { transition-delay: 0.24s; }

/* ==========================================================
   响应式
   ========================================================== */
@media (max-width: 1080px) {
  .hero-inner { grid-template-columns: 1fr; gap: 70px; }
  .hero-copy { text-align: center; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-meta, .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
}

@media (max-width: 900px) {
  .feature-grid, .review-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-card:nth-child(n), .review-card:nth-child(n) { transition-delay: 0s; }
  .feature-card:nth-child(even), .review-card:nth-child(even) { transition-delay: 0.1s; }
}

@media (max-width: 760px) {
  :root { --header-h: 62px; }

  .nav-toggle { display: flex; z-index: 102; }
  .main-nav {
    position: fixed;
    top: 0; right: 0;
    width: min(78vw, 320px);
    height: 100vh;
    padding: calc(var(--header-h) + 30px) 24px 30px;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    background: rgba(14, 14, 18, 0.97);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-left: 1px solid var(--line);
    transform: translateX(105%);
    transition: transform 0.4s var(--ease);
    z-index: 101;
  }
  .main-nav.open { transform: translateX(0); }
  .nav-link { padding: 14px 16px; font-size: 16px; border-radius: 12px; }
  .nav-link.active { background: rgba(255, 255, 255, 0.07); }
  .nav-btn { margin: 10px 0 0; text-align: center; padding: 14px; border-radius: 12px; }

  .hero { padding-top: calc(var(--header-h) + 44px); padding-bottom: 60px; }
  .section { padding: 78px 0; }
  .download-section { padding: 80px 0; }

  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero-stats strong { font-size: 22px; }

  .download-card { padding: 52px 24px 44px; }
  .btn-xl { padding: 17px 42px; font-size: 17px; }

  .footer-inner { flex-direction: column; align-items: flex-start; }
  .back-top { right: 18px; bottom: 18px; width: 42px; height: 42px; }
}

@media (max-width: 600px) {
  .feature-grid, .review-grid { grid-template-columns: 1fr; }
  .feature-card, .review-card { padding: 26px 22px; }

  .hero-title { letter-spacing: 0; }
  .hero-meta { gap: 10px; }
  .meta-item { padding: 10px 14px; flex: 1; min-width: 140px; justify-content: center; }
  .btn-lg { width: 100%; }

  /* 截图叠加区缩小 */
  .shots { width: 330px; height: 400px; }
  .shot { width: 168px; height: 338px; top: 22px; }
  .shot[data-shot="1"] { margin-left: -84px; }
  .shot[data-shot="0"].is-active { transform: rotate(0) scale(1.05) translateY(-16px) translateX(48px); }
  .shot[data-shot="1"].is-active { transform: scale(1.05) translateY(-16px); }
  .shot[data-shot="2"].is-active { transform: rotate(0) scale(1.05) translateY(-16px) translateX(-48px); }
  .shot-frame { border-radius: 26px; padding: 6px; }
  .shot-frame img { border-radius: 20px; }
  .shot-frame::after { width: 52px; height: 12px; top: 11px; }
  .shot-tag { font-size: 12px; padding: 5px 14px; bottom: 16px; }
  .shots-hint { font-size: 12px; bottom: -2px; }

  .hide-mobile { display: none; }
  .faq-q { padding: 18px 20px; font-size: 15.5px; }
  .faq-a p { padding: 0 20px 20px; }
}

@media (max-width: 360px) {
  .shots { transform: scale(0.92); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}