:root {
  --purple-primary: #9B7BEF;
  --purple-light: #C7A5FF;
  --purple-deep: #5B3DBF;
  --purple-dark: #3A2070;
  --purple-bg: #F3EEFF;
  --purple-surface: #FAF8FF;
  --purple-mist: rgba(155, 123, 239, 0.08);
  --ink: #1A1028;
  --ink-soft: #6B6080;
  --ink-muted: #9890A8;
  --surface: #FFFFFF;
  --shadow-sm: 0 2px 8px rgba(91, 61, 191, 0.06);
  --shadow-md: 0 12px 40px rgba(91, 61, 191, 0.10);
  --shadow-lg: 0 24px 80px rgba(91, 61, 191, 0.14);
  --shadow-glow: 0 8px 32px rgba(155, 123, 239, 0.25);
  --radius-sm: 14px;
  --radius-md: 22px;
  --radius-lg: 28px;
  --radius-xl: 36px;
  --pill: 999px;
  --max-w: min(1800px, 90vw);
  --font: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei UI', system-ui, sans-serif;
  --transition: 0.36s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  font-family: var(--font);
  color: var(--ink);
  background: linear-gradient(180deg, #F8F5FF 0%, #EEEAFC 40%, #F5F2FF 100%);
  overflow-x: hidden;
  position: relative;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ─── 背景装饰 ──────────────────────────────── */

.bg-decor {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}

.orb--1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(155, 123, 239, 0.3), transparent 70%);
  top: -200px;
  right: -100px;
  animation: float-slow 20s ease-in-out infinite;
}

.orb--2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(199, 165, 255, 0.25), transparent 70%);
  bottom: 10%;
  left: -80px;
  animation: float-slow 25s ease-in-out infinite reverse;
}

.orb--3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(91, 61, 191, 0.15), transparent 70%);
  top: 50%;
  right: 20%;
  animation: float-slow 18s ease-in-out infinite;
}

@keyframes float-slow {
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(30px, -20px); }
  66% { transform: translate(-20px, 15px); }
}

/* ─── 导航栏 ────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px) saturate(1.8);
  -webkit-backdrop-filter: blur(20px) saturate(1.8);
  background: rgba(248, 245, 255, 0.78);
  border-bottom: 1px solid rgba(155, 123, 239, 0.1);
}

.nav__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 clamp(24px, 2vw, 48px);
  height: clamp(72px, 5.5vw, 96px);
  display: flex;
  align-items: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand__icon {
  width: clamp(44px, 3vw, 64px);
  height: clamp(44px, 3vw, 64px);
  border-radius: clamp(14px, 1vw, 20px);
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--purple-deep), var(--purple-primary));
  color: #fff;
  font-weight: 900;
  font-size: clamp(1.1rem, 1.1vw, 1.6rem);
  box-shadow: 0 4px 16px rgba(91, 61, 191, 0.3);
}

.brand__text {
  font-size: clamp(1.15rem, 1.1vw, 1.6rem);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}

/* ─── Hero ───────────────────────────────────── */

.hero {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 80px 24px 40px;
}

.hero__inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 18px;
  border-radius: var(--pill);
  background: rgba(155, 123, 239, 0.12);
  border: 1px solid rgba(155, 123, 239, 0.18);
  color: var(--purple-deep);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  animation: fade-in-up 0.8s ease both;
}

.hero__title {
  margin-top: 28px;
  font-size: clamp(3rem, 6vw, 8rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.04em;
  animation: fade-in-up 0.8s ease 0.15s both;
}

.hero__line {
  display: block;
  color: var(--ink);
}

.hero__line--accent {
  background: linear-gradient(135deg, var(--purple-deep) 0%, var(--purple-primary) 50%, var(--purple-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__desc {
  margin-top: 24px;
  font-size: clamp(1rem, 1.4vw, 1.6rem);
  line-height: 1.8;
  color: var(--ink-soft);
  animation: fade-in-up 0.8s ease 0.3s both;
}

/* ─── 平台卡片 ───────────────────────────────── */

.platforms {
  position: relative;
  z-index: 1;
  padding: 40px 24px 80px;
}

.platforms__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: clamp(28px, 2.5vw, 56px) clamp(24px, 2.2vw, 48px);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(155, 123, 239, 0.14);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
  overflow: hidden;
  animation: fade-in-up 0.8s ease both;
}

.card:nth-child(1) { animation-delay: 0.4s; }
.card:nth-child(2) { animation-delay: 0.55s; }
.card:nth-child(3) { animation-delay: 0.7s; }

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.card__glow {
  position: absolute;
  top: -60px;
  right: -60px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.card:hover .card__glow {
  opacity: 1;
}

.card--ios .card__glow {
  background: radial-gradient(circle, rgba(155, 123, 239, 0.15), transparent 70%);
}

.card--web .card__glow {
  background: radial-gradient(circle, rgba(91, 61, 191, 0.12), transparent 70%);
}

.card--android .card__glow {
  background: radial-gradient(circle, rgba(199, 165, 255, 0.18), transparent 70%);
}

.card__badge {
  display: inline-flex;
  align-self: flex-start;
  align-items: center;
  height: clamp(28px, 2.2vw, 40px);
  padding: 0 clamp(12px, 1vw, 20px);
  border-radius: var(--pill);
  font-size: clamp(0.72rem, 0.7vw, 0.95rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  background: linear-gradient(135deg, var(--purple-primary), var(--purple-light));
  color: #fff;
}

.card__icon {
  width: clamp(52px, 4vw, 80px);
  height: clamp(52px, 4vw, 80px);
  margin-top: clamp(18px, 1.6vw, 32px);
  display: grid;
  place-items: center;
  border-radius: clamp(16px, 1.4vw, 24px);
  background: var(--purple-bg);
  color: var(--purple-deep);
}

.card__icon svg {
  width: clamp(26px, 2vw, 40px);
  height: clamp(26px, 2vw, 40px);
}

.card__title {
  margin-top: clamp(16px, 1.4vw, 28px);
  font-size: clamp(1.2rem, 1.3vw, 1.9rem);
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.card__desc {
  margin-top: clamp(8px, 0.7vw, 14px);
  flex: 1;
  font-size: clamp(0.88rem, 0.85vw, 1.2rem);
  line-height: 1.75;
  color: var(--ink-soft);
}

.card__action {
  margin-top: clamp(18px, 1.6vw, 32px);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: clamp(0.88rem, 0.85vw, 1.15rem);
  font-weight: 700;
  color: var(--purple-deep);
  transition: gap var(--transition);
}

.card:hover .card__action {
  gap: 10px;
}

.card__arrow {
  width: 18px;
  height: 18px;
}

/* iOS 卡片特殊状态（即将上线） */
.card--ios {
  opacity: 0.85;
  cursor: default;
}

.card--ios .card__action-text {
  color: var(--ink-muted);
}

.card--ios .card__arrow {
  display: none;
}

.card--ios:hover {
  transform: none;
  box-shadow: var(--shadow-md);
}

/* ─── 特性区 ─────────────────────────────────── */

.features {
  position: relative;
  z-index: 1;
  padding: 0 24px 100px;
}

.features__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature {
  padding: clamp(24px, 2vw, 48px) clamp(20px, 1.8vw, 44px);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(155, 123, 239, 0.08);
  animation: fade-in-up 0.8s ease 0.85s both;
}

.feature__no {
  display: inline-block;
  font-size: clamp(2rem, 2.2vw, 3.4rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, var(--purple-light), var(--purple-primary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.feature__title {
  margin-top: clamp(10px, 0.8vw, 18px);
  font-size: clamp(1rem, 1.1vw, 1.5rem);
  font-weight: 800;
  color: var(--ink);
}

.feature__desc {
  margin-top: clamp(6px, 0.5vw, 12px);
  font-size: clamp(0.85rem, 0.82vw, 1.15rem);
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ─── Footer ─────────────────────────────────── */

.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(155, 123, 239, 0.1);
  background: rgba(248, 245, 255, 0.6);
  backdrop-filter: blur(12px);
}

.footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: clamp(20px, 2vw, 40px) clamp(20px, 2vw, 48px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(10px, 0.8vw, 16px);
  text-align: center;
}

.footer__copy {
  font-size: clamp(0.78rem, 0.78vw, 1rem);
  color: var(--ink-muted);
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(16px, 1.5vw, 32px);
}

.footer__links a {
  font-size: clamp(0.78rem, 0.78vw, 1rem);
  color: var(--ink-muted);
  transition: color 0.2s;
}

.footer__links a:hover {
  color: var(--purple-deep);
}

.footer__beian {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: clamp(12px, 1.2vw, 24px);
}

.footer__beian a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: clamp(0.72rem, 0.72vw, 0.92rem);
  color: var(--ink-muted);
  transition: color 0.2s;
  text-decoration: none;
}

.footer__beian a:hover {
  color: var(--purple-deep);
}

.footer__beian img {
  flex-shrink: 0;
  opacity: 0.6;
}

/* ─── 动画 ───────────────────────────────────── */

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ─── 响应式：大屏 PC（> 1440px）用 clamp 流式缩放，无需硬编码断点 ── */

/* ─── 响应式：平板（768px ~ 1024px）三列并排 ── */

@media (max-width: 1024px) and (min-width: 768px) {
  .hero {
    padding-top: 60px;
  }

  .platforms__inner {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .card {
    padding: 24px 20px 22px;
  }

  .card__icon {
    width: 48px;
    height: 48px;
    margin-top: 18px;
    border-radius: 14px;
  }

  .card__icon svg {
    width: 24px;
    height: 24px;
  }

  .card__title {
    font-size: 1.15rem;
    margin-top: 14px;
  }

  .card__desc {
    font-size: 0.88rem;
  }

  .features__inner {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .feature {
    padding: 24px 20px;
  }
}

/* ─── 响应式：小平板（< 768px 且 > 640px） ─── */

@media (max-width: 767px) and (min-width: 641px) {
  .platforms__inner {
    grid-template-columns: 1fr;
    max-width: 520px;
    gap: 16px;
  }

  .features__inner {
    grid-template-columns: 1fr;
    max-width: 520px;
  }
}

/* ─── 响应式：手机 ──────────────────────────── */

@media (max-width: 640px) {
  .nav__inner {
    height: 60px;
  }

  .brand__icon {
    width: 38px;
    height: 38px;
    font-size: 1rem;
    border-radius: 12px;
  }

  .brand__text {
    font-size: 1.05rem;
  }

  .hero {
    padding: 48px 20px 28px;
  }

  .hero__title {
    font-size: clamp(2.4rem, 10vw, 3.2rem);
  }

  .hero__desc {
    font-size: 0.95rem;
  }

  .hero__desc br {
    display: none;
  }

  .platforms {
    padding: 28px 16px 60px;
  }

  .platforms__inner {
    grid-template-columns: 1fr;
    max-width: none;
  }

  .card {
    padding: 28px 24px 24px;
  }

  .card__icon {
    width: 56px;
    height: 56px;
    margin-top: 24px;
    border-radius: 18px;
  }

  .card__icon svg {
    width: 28px;
    height: 28px;
  }

  .card__title {
    font-size: 1.35rem;
    margin-top: 20px;
  }

  .card__desc {
    font-size: 0.95rem;
  }

  .features {
    padding: 0 16px 72px;
  }

  .features__inner {
    grid-template-columns: 1fr;
    max-width: none;
    gap: 16px;
  }

  .feature {
    padding: 24px 20px;
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
    gap: 12px;
    padding: 24px 20px;
  }
}