/* ==========================================================
   碳基圈 · AI 音乐创作社区 落地页样式
   配色取自 App Logo：闪电蓝 → 电光紫 渐变
   ========================================================== */

:root {
  /* Logo 主色 */
  --c-blue: #3C3AE3;
  --c-indigo: #4F46E5;
  --c-violet: #6D28E0;
  --c-purple: #7C2FE8;
  --c-fuchsia: #9446F5;

  --brand-gradient: linear-gradient(135deg, #3C3AE3 0%, #6328E0 52%, #8338F0 100%);
  --brand-gradient-soft: linear-gradient(135deg, rgba(60, 58, 227, .12), rgba(124, 47, 232, .12));

  /* 中性色 */
  --ink: #16123A;
  --ink-soft: #3A3660;
  --muted: #6F6B92;
  --line: #E8E6F8;
  --bg: #FFFFFF;
  --bg-alt: #F6F5FE;
  --hero-dark: #0C0826;

  --radius: 18px;
  --radius-lg: 28px;
  --shadow-card: 0 14px 40px -18px rgba(40, 28, 110, .28);
  --shadow-float: 0 30px 70px -25px rgba(18, 10, 64, .65);
  --header-h: 68px;
}

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

html { scroll-behavior: smooth; }

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

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

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

section { scroll-margin-top: calc(var(--header-h) + 12px); }

/* ---------- 空 src 图片占位（填入真实地址后自动显示原图） ---------- */
.logo-img {
  background-image: var(--brand-gradient),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M13 2 4.5 13.5H11L10 22l8.5-12H12L13 2Z'/%3E%3C/svg%3E");
  background-size: 100% 100%, 56% 56%;
  background-position: center, center;
  background-repeat: no-repeat, no-repeat;
  color: transparent;
}

.phone-frame img {
  background:
    radial-gradient(120% 90% at 80% 0%, rgba(148, 70, 245, .55), transparent 60%),
    radial-gradient(120% 90% at 0% 100%, rgba(60, 58, 227, .55), transparent 55%),
    linear-gradient(160deg, #1B1450 0%, #0E0A30 100%);
  color: transparent;
}

/* ==========================================================
   顶部导航
   ========================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  z-index: 100;
  transition: background .3s ease, box-shadow .3s ease, border-color .3s ease;
  border-bottom: 1px solid transparent;
}

.site-header .nav-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand { display: flex; align-items: center; gap: 10px; }

.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  box-shadow: 0 8px 20px -8px rgba(101, 40, 224, .7);
  flex: none;
}

.brand-name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 1px;
  color: #fff;
  transition: color .3s ease;
}

.nav-links { display: flex; align-items: center; gap: 6px; }

.nav-link {
  position: relative;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, .82);
  border-radius: 10px;
  transition: color .25s ease, background .25s ease;
}

.nav-link:hover { color: #fff; background: rgba(255, 255, 255, .1); }

.nav-link.active { color: #fff; }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, #8B7CFF, #C29BFF);
}

.nav-link.nav-cta {
  margin-left: 8px;
  padding: 9px 20px;
  color: #fff;
  font-weight: 600;
  border-radius: 999px;
  background: var(--brand-gradient);
  box-shadow: 0 10px 24px -10px rgba(124, 47, 232, .9);
}
.nav-link.nav-cta::after { display: none; }
.nav-link.nav-cta:hover { background: var(--brand-gradient); filter: brightness(1.08); }

/* 滚动后的浅色导航 */
.site-header.scrolled {
  background: rgba(255, 255, 255, .86);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--line);
  box-shadow: 0 6px 24px -16px rgba(40, 28, 110, .35);
}
.site-header.scrolled .brand-name { color: var(--ink); }
.site-header.scrolled .nav-link { color: var(--ink-soft); }
.site-header.scrolled .nav-link:hover { color: var(--c-violet); background: rgba(109, 40, 224, .08); }
.site-header.scrolled .nav-link.active { color: var(--c-violet); }
.site-header.scrolled .nav-link.active::after { background: var(--brand-gradient); }

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 10px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: #fff;
  transition: transform .3s ease, opacity .3s ease, background .3s ease;
}
.site-header.scrolled .nav-toggle span { background: var(--ink); }
.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;
  background: var(--hero-dark);
  color: #fff;
  padding: calc(var(--header-h) + 70px) 0 90px;
  overflow: hidden;
}

.hero-bg { position: absolute; inset: 0; pointer-events: none; }

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .55;
}
.glow-1 {
  width: 520px; height: 520px;
  left: -160px; top: -180px;
  background: radial-gradient(circle, #3C3AE3, transparent 65%);
  animation: floatGlow 14s ease-in-out infinite;
}
.glow-2 {
  width: 480px; height: 480px;
  right: -140px; top: 40px;
  background: radial-gradient(circle, #8338F0, transparent 65%);
  animation: floatGlow 18s ease-in-out infinite reverse;
}
.glow-3 {
  width: 420px; height: 420px;
  left: 40%; bottom: -260px;
  background: radial-gradient(circle, #5B2BD8, transparent 65%);
  opacity: .4;
}

@keyframes floatGlow {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, 30px) scale(1.12); }
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 75%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 50px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  font-size: 13.5px;
  font-weight: 500;
  color: #DCD8FF;
  border: 1px solid rgba(160, 140, 255, .35);
  background: rgba(124, 47, 232, .16);
  border-radius: 999px;
  margin-bottom: 26px;
}
.hero-badge svg { width: 15px; height: 15px; color: #C9B8FF; }

.hero-title {
  font-size: clamp(38px, 5vw, 60px);
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: 1px;
  margin-bottom: 24px;
}

.text-gradient {
  background: linear-gradient(92deg, #9A86FF 0%, #C69BFF 55%, #8EA2FF 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-desc {
  font-size: 17px;
  color: rgba(235, 232, 255, .82);
  max-width: 540px;
  margin-bottom: 30px;
}
.hero-desc strong { color: #fff; font-weight: 700; }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 34px;
}
.hero-meta li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 18px;
  min-width: 128px;
  border-radius: 14px;
  border: 1px solid rgba(160, 140, 255, .22);
  background: rgba(255, 255, 255, .05);
  backdrop-filter: blur(6px);
}
.meta-label { font-size: 12.5px; color: rgba(200, 195, 235, .7); }
.meta-value { font-size: 17px; font-weight: 800; color: #fff; letter-spacing: .5px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 20px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 15px 32px;
  border-radius: 999px;
  font-size: 16.5px;
  font-weight: 700;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease;
}
.btn svg { width: 19px; height: 19px; }

.btn-primary {
  color: #fff;
  background: var(--brand-gradient);
  box-shadow: 0 18px 38px -14px rgba(124, 47, 232, .85);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 26px 48px -14px rgba(124, 47, 232, .95); }

.btn-ghost {
  color: #fff;
  border: 1px solid rgba(200, 190, 255, .45);
  background: rgba(255, 255, 255, .04);
}
.btn-ghost:hover { transform: translateY(-3px); border-color: #B6A6FF; background: rgba(255, 255, 255, .1); }

.hero-tip { font-size: 13px; color: rgba(195, 190, 230, .6); }

/* ---------- 截图叠放 ---------- */
.hero-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.shots {
  position: relative;
  width: 340px;
  height: 470px;
  margin: 10px auto;
}

.shot {
  position: absolute;
  top: 0;
  width: 232px;
  cursor: pointer;
  transition: transform .55s cubic-bezier(.22, 1, .36, 1),
              filter .45s ease, opacity .45s ease;
  outline: none;
}

.phone-frame {
  position: relative;
  aspect-ratio: 9 / 18.6;
  border-radius: 30px;
  padding: 7px;
  background: linear-gradient(160deg, rgba(255, 255, 255, .35), rgba(255, 255, 255, .06));
  border: 1px solid rgba(255, 255, 255, .22);
  box-shadow: var(--shadow-float);
  overflow: hidden;
  transition: box-shadow .45s ease;
}

.phone-frame::before {
  content: "";
  position: absolute;
  top: 12px; left: 50%;
  transform: translateX(-50%);
  width: 64px; height: 16px;
  border-radius: 999px;
  background: rgba(0, 0, 0, .55);
  z-index: 2;
}

.phone-frame img {
  width: 100%;
  height: 100%;
  border-radius: 24px;
  object-fit: cover;
}

.shot figcaption {
  margin-top: 14px;
  text-align: center;
  font-size: 13.5px;
  font-weight: 600;
  color: rgba(220, 216, 250, .75);
  letter-spacing: 1px;
  transition: color .4s ease;
}

.shot-left {
  left: -6px;
  top: 34px;
  transform: rotate(-9deg) scale(.88);
  z-index: 1;
  filter: brightness(.68) saturate(.85);
}
.shot-center {
  left: 50%;
  transform: translateX(-50%) scale(1);
  z-index: 3;
  filter: none;
  animation: phoneFloat 5.5s ease-in-out infinite;
}
.shot-right {
  right: -6px;
  top: 34px;
  transform: rotate(9deg) scale(.88);
  z-index: 1;
  filter: brightness(.68) saturate(.85);
}

@keyframes phoneFloat {
  0%, 100% { transform: translateX(-50%) translateY(0) scale(1); }
  50% { transform: translateX(-50%) translateY(-12px) scale(1); }
}

/* 悬停 / 点按：突出当前截图，其余后退 */
.shots:hover .shot,
.shots.has-active .shot {
  filter: brightness(.6) saturate(.8);
  transform: scale(.86);
  z-index: 1;
}
.shots:hover .shot-center,
.shots.has-active .shot-center { animation: none; }

.shots:hover .shot-left,
.shots.has-active .shot-left { transform: rotate(-9deg) scale(.86); }
.shots:hover .shot-right,
.shots.has-active .shot-right { transform: rotate(9deg) scale(.86); }

.shots .shot:hover,
.shots .shot.active {
  filter: none;
  transform: translateX(0) rotate(0deg) translateY(-10px) scale(1.07);
  z-index: 6;
  animation: none;
}
.shots .shot:hover figcaption,
.shots .shot.active figcaption { color: #fff; }
.shots .shot:hover .phone-frame,
.shots .shot.active .phone-frame {
  box-shadow: 0 40px 90px -20px rgba(124, 47, 232, .75);
}

.shots-hint {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
  font-size: 13px;
  color: rgba(200, 195, 235, .65);
}
.shots-hint svg { width: 16px; height: 16px; }

/* ==========================================================
   数据条
   ========================================================== */
.stats-bar {
  position: relative;
  z-index: 3;
  margin-top: -38px;
  padding-bottom: 20px;
}

.stats-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  padding: 28px 34px;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 60px -28px rgba(40, 28, 110, .35);
  border: 1px solid var(--line);
}

.stat-item { text-align: center; }
.stat-item strong {
  display: block;
  font-size: 28px;
  font-weight: 900;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-item strong em { font-style: normal; font-size: 16px; }
.stat-item span { font-size: 14px; color: var(--muted); }

/* ==========================================================
   通用 Section
   ========================================================== */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }

.section-head { text-align: center; max-width: 680px; margin: 0 auto 58px; }

.section-tag {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: 3px;
  color: var(--c-purple);
  background: rgba(124, 47, 232, .09);
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.section-title {
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 900;
  line-height: 1.3;
  color: var(--ink);
  margin-bottom: 14px;
}

.section-desc { font-size: 16px; color: var(--muted); }

/* ==========================================================
   功能亮点
   ========================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  position: relative;
  padding: 34px 30px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform .35s ease, box-shadow .35s ease, border-color .35s ease;
  overflow: hidden;
}
.feature-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--brand-gradient);
  opacity: 0;
  transition: opacity .35s ease;
  z-index: 0;
}
.feature-card > * { position: relative; z-index: 1; }

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-card);
  border-color: transparent;
}
.feature-card:hover::after { opacity: 1; }
.feature-card:hover .feature-icon { background: rgba(255, 255, 255, .18); color: #fff; }
.feature-card:hover h3, .feature-card:hover p { color: #fff; }

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-purple);
  background: var(--brand-gradient-soft);
  margin-bottom: 22px;
  transition: background .35s ease, color .35s ease;
}
.feature-icon svg { width: 27px; height: 27px; }

.feature-card h3 {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--ink);
  transition: color .35s ease;
}
.feature-card p {
  font-size: 14.5px;
  color: var(--muted);
  transition: color .35s ease;
}

/* ==========================================================
   用户评价
   ========================================================== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-card {
  display: flex;
  flex-direction: column;
  padding: 32px 30px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 34px -24px rgba(40, 28, 110, .25);
  transition: transform .35s ease, box-shadow .35s ease;
}
.review-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-card); }

.stars { display: flex; gap: 3px; margin-bottom: 16px; }
.stars span { color: #FFB020; font-size: 17px; }

.review-text {
  font-size: 15px;
  color: var(--ink-soft);
  flex: 1;
  margin-bottom: 24px;
}

.reviewer { display: flex; align-items: center; gap: 13px; }

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 19px;
  font-weight: 800;
  color: #fff;
  flex: none;
  box-shadow: 0 8px 18px -8px rgba(40, 28, 110, .5);
}
.avatar-1 { background: linear-gradient(135deg, #3C3AE3, #7C2FE8); }
.avatar-2 { background: linear-gradient(135deg, #5B2BD8, #9446F5); }
.avatar-3 { background: linear-gradient(135deg, #4338CA, #6D28D9); }

.reviewer-info { display: flex; flex-direction: column; line-height: 1.4; }
.reviewer-info strong { font-size: 15.5px; color: var(--ink); }
.reviewer-info span { font-size: 13px; color: var(--muted); }

/* ==========================================================
   常见问题 FAQ
   ========================================================== */
.faq-wrap { max-width: 860px; }

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  overflow: hidden;
  transition: border-color .3s ease, box-shadow .3s ease;
}
.faq-item.open {
  border-color: rgba(124, 47, 232, .45);
  box-shadow: 0 16px 40px -24px rgba(101, 40, 224, .45);
}

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 21px 26px;
  text-align: left;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink);
}

.faq-icon {
  position: relative;
  width: 22px;
  height: 22px;
  flex: none;
}
.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 13px;
  height: 2.2px;
  border-radius: 2px;
  background: var(--c-purple);
  transform: translate(-50%, -50%);
  transition: transform .3s ease;
}
.faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq-item.open .faq-icon::after { transform: translate(-50%, -50%) rotate(0); }

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease;
}
.faq-a p {
  padding: 0 26px 22px;
  font-size: 15px;
  color: var(--muted);
}
.faq-a p strong { color: var(--c-violet); }

/* ==========================================================
   下载区域
   ========================================================== */
.download {
  position: relative;
  padding: 110px 0;
  background: var(--hero-dark);
  overflow: hidden;
  text-align: center;
}

.download-bg { position: absolute; inset: 0; pointer-events: none; }
.glow-4 {
  width: 560px; height: 560px;
  left: -180px; bottom: -280px;
  background: radial-gradient(circle, #3C3AE3, transparent 65%);
  opacity: .5;
  filter: blur(90px);
  animation: floatGlow 16s ease-in-out infinite;
}
.glow-5 {
  width: 560px; height: 560px;
  right: -180px; top: -260px;
  background: radial-gradient(circle, #8338F0, transparent 65%);
  opacity: .5;
  filter: blur(90px);
  animation: floatGlow 20s ease-in-out infinite reverse;
}

.download-inner { position: relative; z-index: 2; }

.download-logo {
  width: 92px;
  height: 92px;
  border-radius: 26px;
  margin: 0 auto 28px;
  box-shadow: 0 24px 60px -16px rgba(124, 47, 232, .8);
}

.download-title {
  color: #fff;
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 900;
  margin-bottom: 14px;
}

.download-desc {
  color: rgba(225, 222, 250, .8);
  font-size: 17px;
  margin-bottom: 30px;
}

.download-meta {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 14px;
  padding: 12px 24px;
  border-radius: 999px;
  border: 1px solid rgba(160, 140, 255, .28);
  background: rgba(255, 255, 255, .05);
  color: rgba(220, 216, 245, .85);
  font-size: 14px;
  margin-bottom: 40px;
}
.download-meta strong { color: #fff; font-weight: 800; }
.download-meta i {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: rgba(190, 175, 255, .6);
}

/* 唯一真实下载按钮 */
.btn-download {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 20px 56px;
  border-radius: 999px;
  font-size: 19px;
  font-weight: 800;
  color: var(--c-violet);
  background: #fff;
  box-shadow: 0 24px 60px -18px rgba(148, 70, 245, .75),
             0 0 0 0 rgba(255, 255, 255, .55);
  animation: pulseBtn 2.4s ease-out infinite;
  transition: transform .25s ease, box-shadow .25s ease;
}
.btn-download svg { width: 22px; height: 22px; }
.btn-download:hover {
  transform: translateY(-4px) scale(1.02);
  color: var(--c-purple);
  box-shadow: 0 32px 70px -18px rgba(148, 70, 245, .9);
}
.btn-download:active { transform: translateY(-1px) scale(1); }

@keyframes pulseBtn {
  0% { box-shadow: 0 24px 60px -18px rgba(148, 70, 245, .75), 0 0 0 0 rgba(255, 255, 255, .5); }
  70% { box-shadow: 0 24px 60px -18px rgba(148, 70, 245, .75), 0 0 0 22px rgba(255, 255, 255, 0); }
  100% { box-shadow: 0 24px 60px -18px rgba(148, 70, 245, .75), 0 0 0 0 rgba(255, 255, 255, 0); }
}

.download-note {
  margin-top: 24px;
  font-size: 13px;
  color: rgba(195, 190, 230, .55);
}

/* ==========================================================
   页脚
   ========================================================== */
.site-footer {
  background: #08051C;
  color: rgba(220, 216, 245, .7);
  padding: 54px 0 30px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
  flex-wrap: wrap;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}

.footer-brand { display: flex; align-items: center; gap: 14px; }
.footer-brand .brand-logo {
  width: 46px; height: 46px;
  border-radius: 13px;
  box-shadow: none;
}
.footer-brand strong { display: block; color: #fff; font-size: 18px; }
.footer-brand span { font-size: 13.5px; }

.footer-links { display: flex; flex-wrap: wrap; gap: 8px; }
.footer-links a {
  padding: 7px 14px;
  font-size: 14px;
  border-radius: 8px;
  transition: color .25s ease, background .25s ease;
}
.footer-links a:hover { color: #fff; background: rgba(255, 255, 255, .08); }

.footer-copy {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 24px;
  font-size: 12.5px;
  color: rgba(190, 185, 225, .45);
}

/* ==========================================================
   滚动入场动画
   ========================================================== */
.reveal {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity .8s cubic-bezier(.22, 1, .36, 1),
              transform .8s cubic-bezier(.22, 1, .36, 1);
}
.reveal.in { opacity: 1; transform: translateY(0); }

/* 首屏元素错开出现 */
.hero-copy .reveal:nth-child(1) { transition-delay: .05s; }
.hero-copy .reveal:nth-child(2) { transition-delay: .15s; }
.hero-copy .reveal:nth-child(3) { transition-delay: .25s; }
.hero-copy .reveal:nth-child(4) { transition-delay: .35s; }
.hero-copy .reveal:nth-child(5) { transition-delay: .45s; }
.hero-copy .reveal:nth-child(6) { transition-delay: .55s; }

.feature-grid .reveal:nth-child(2),
.review-grid .reveal:nth-child(2) { transition-delay: .12s; }
.feature-grid .reveal:nth-child(3),
.review-grid .reveal:nth-child(3) { transition-delay: .24s; }
.feature-grid .reveal:nth-child(5) { transition-delay: .12s; }
.feature-grid .reveal:nth-child(6) { transition-delay: .24s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ==========================================================
   响应式
   ========================================================== */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 70px; }
  .hero-copy { text-align: center; }
  .hero-desc { margin-inline: auto; }
  .hero-meta, .hero-actions { justify-content: center; }
  .feature-grid,
  .review-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  :root { --header-h: 60px; }

  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px 6%;
    background: rgba(255, 255, 255, .97);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 40px -24px rgba(40, 28, 110, .4);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: transform .3s ease, opacity .3s ease, visibility .3s;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; visibility: visible; }

  .nav-links .nav-link {
    color: var(--ink-soft) !important;
    padding: 13px 16px;
    font-size: 16px;
    border-radius: 12px;
  }
  .nav-links .nav-link:hover { background: rgba(109, 40, 224, .08); color: var(--c-violet) !important; }
  .nav-link.active::after { display: none; }
  .nav-link.nav-cta {
    margin: 6px 0 0;
    text-align: center;
    justify-content: center;
    color: #fff !important;
  }

  .hero { padding: calc(var(--header-h) + 48px) 0 76px; }

  .shots { width: 290px; height: 420px; }
  .shot { width: 196px; }
  .shot-left { left: -14px; }
  .shot-right { right: -14px; }

  .stats-inner {
    grid-template-columns: repeat(2, 1fr);
    gap: 22px 12px;
    padding: 26px 20px;
  }

  .section { padding: 72px 0; }
  .download { padding: 84px 0; }

  .feature-grid,
  .review-grid { grid-template-columns: 1fr; }

  .btn { padding: 14px 26px; font-size: 15.5px; }
  .btn-download { padding: 17px 38px; font-size: 17px; width: 100%; justify-content: center; }

  .download-meta { gap: 10px; font-size: 13px; }
  .download-meta i { display: none; }
}

@media (max-width: 420px) {
  .hero-meta li { flex: 1; min-width: 46%; }
  .shots { transform: scale(.92); }
  .footer-inner, .footer-copy { justify-content: center; text-align: center; }
}