:root {
  --purple-primary: #9B7BEF;
  --purple-light: #C7A5FF;
  --purple-deep: #5B3DBF;
  --purple-dark: #3A2070;
  --purple-bg: #F3EEFF;
  --purple-surface: #FAF8FF;
  --ink: #1A1028;
  --ink-soft: #6B6080;
  --ink-muted: #9890A8;
  --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; }

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

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: 0.35;
}

.orb--1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(155, 123, 239, 0.3), transparent 70%);
  top: -150px;
  right: -80px;
  animation: orb-drift 20s ease-in-out infinite;
}

.orb--2 {
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(199, 165, 255, 0.25), transparent 70%);
  bottom: 20%;
  left: -60px;
  animation: orb-drift 24s ease-in-out infinite reverse;
}

@keyframes orb-drift {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(25px, -18px); }
}

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

.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(20px, 2vw, 48px);
  height: clamp(64px, 5vw, 96px);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: clamp(10px, 0.8vw, 16px);
}

.brand__icon {
  width: clamp(40px, 3vw, 60px);
  height: clamp(40px, 3vw, 60px);
  border-radius: clamp(12px, 1vw, 18px);
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--purple-deep), var(--purple-primary));
  color: #fff;
  font-weight: 900;
  font-size: clamp(1rem, 1.1vw, 1.5rem);
  box-shadow: 0 4px 16px rgba(91, 61, 191, 0.3);
}

.brand__text {
  font-size: clamp(1.05rem, 1.1vw, 1.5rem);
  font-weight: 700;
  color: var(--ink);
}

.nav__back {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: clamp(0.85rem, 0.85vw, 1.1rem);
  font-weight: 600;
  color: var(--purple-deep);
  padding: clamp(6px, 0.5vw, 10px) clamp(14px, 1.2vw, 22px);
  border-radius: var(--pill);
  background: rgba(155, 123, 239, 0.08);
  transition: background 0.2s;
}

.nav__back:hover { background: rgba(155, 123, 239, 0.16); }

/* ─── 通用 Slide ─────────────────────────────── */

.slide {
  position: relative;
  z-index: 1;
  padding: clamp(48px, 5vw, 100px) clamp(16px, 2vw, 48px);
}

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

.section-head {
  text-align: center;
  margin-bottom: clamp(32px, 3vw, 60px);
}

.section-tag {
  display: inline-flex;
  align-items: center;
  height: clamp(30px, 2.2vw, 44px);
  padding: 0 clamp(14px, 1.1vw, 22px);
  border-radius: var(--pill);
  background: rgba(155, 123, 239, 0.1);
  border: 1px solid rgba(155, 123, 239, 0.15);
  color: var(--purple-deep);
  font-size: clamp(0.78rem, 0.75vw, 1rem);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.section-title {
  margin-top: clamp(16px, 1.4vw, 28px);
  font-size: clamp(2rem, 3.5vw, 5rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.section-desc {
  margin-top: clamp(12px, 1vw, 20px);
  font-size: clamp(0.92rem, 0.95vw, 1.3rem);
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: min(700px, 80vw);
  margin-left: auto;
  margin-right: auto;
}

/* ─── 按钮 ───────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: clamp(6px, 0.5vw, 10px);
  font-family: var(--font);
  font-weight: 700;
  border: none;
  cursor: pointer;
  border-radius: var(--pill);
  transition: transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
}

.btn:hover { transform: translateY(-2px); }

.btn--primary {
  background: linear-gradient(135deg, var(--purple-deep), var(--purple-primary));
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn--primary:hover { box-shadow: 0 12px 40px rgba(155, 123, 239, 0.35); }

.btn--ghost {
  background: rgba(155, 123, 239, 0.1);
  color: var(--purple-deep);
  border: 1px solid rgba(155, 123, 239, 0.2);
}

.btn--lg {
  height: clamp(52px, 4vw, 72px);
  padding: 0 clamp(28px, 2.5vw, 48px);
  font-size: clamp(1rem, 1.05vw, 1.4rem);
}

.btn--wide {
  width: 100%;
  max-width: min(400px, 80vw);
}

.btn__icon {
  width: clamp(18px, 1.4vw, 26px);
  height: clamp(18px, 1.4vw, 26px);
  flex-shrink: 0;
}

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

.slide--hero {
  text-align: center;
  padding-top: clamp(40px, 4vw, 80px);
  padding-bottom: clamp(40px, 4vw, 80px);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  height: clamp(32px, 2.4vw, 44px);
  padding: 0 clamp(16px, 1.2vw, 24px);
  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: clamp(0.82rem, 0.8vw, 1.05rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  animation: fade-up 0.7s ease both;
}

.hero__title {
  margin-top: clamp(20px, 1.8vw, 36px);
  font-size: clamp(2.4rem, 5.5vw, 7.5rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.04em;
  animation: fade-up 0.7s ease 0.1s both;
}

.hero__line { display: block; }

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

.hero__desc {
  margin-top: clamp(14px, 1.2vw, 24px);
  font-size: clamp(0.92rem, 1.1vw, 1.5rem);
  line-height: 1.8;
  color: var(--ink-soft);
  animation: fade-up 0.7s ease 0.2s both;
}

.hero__actions {
  margin-top: clamp(24px, 2.5vw, 48px);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(10px, 1vw, 18px);
  animation: fade-up 0.7s ease 0.3s both;
}

.hero__note {
  margin-top: clamp(12px, 1vw, 20px);
  font-size: clamp(0.78rem, 0.75vw, 1rem);
  color: var(--ink-muted);
  animation: fade-up 0.7s ease 0.4s both;
}

/* ─── Steps Grid ─────────────────────────────── */

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(14px, 1.4vw, 28px);
}

.step-card {
  padding: clamp(22px, 2vw, 44px) clamp(18px, 1.6vw, 36px);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(155, 123, 239, 0.12);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.step-card__no {
  display: inline-block;
  font-size: clamp(1.8rem, 2vw, 3rem);
  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;
}

.step-card__icon {
  width: clamp(44px, 3.5vw, 68px);
  height: clamp(44px, 3.5vw, 68px);
  margin-top: clamp(12px, 1vw, 20px);
  display: grid;
  place-items: center;
  border-radius: clamp(14px, 1.1vw, 20px);
  background: var(--purple-bg);
  color: var(--purple-deep);
}

.step-card__icon svg {
  width: clamp(22px, 1.8vw, 34px);
  height: clamp(22px, 1.8vw, 34px);
}

.step-card__title {
  margin-top: clamp(12px, 1vw, 20px);
  font-size: clamp(1rem, 1.05vw, 1.5rem);
  font-weight: 800;
  color: var(--ink);
}

.step-card__desc {
  margin-top: clamp(6px, 0.5vw, 12px);
  font-size: clamp(0.84rem, 0.82vw, 1.1rem);
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ─── Tips Grid ──────────────────────────────── */

.tips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(14px, 1.4vw, 28px);
}

.tip-card {
  padding: clamp(20px, 1.8vw, 36px) clamp(18px, 1.6vw, 32px);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(155, 123, 239, 0.1);
  backdrop-filter: blur(8px);
}

.tip-card__title {
  font-size: clamp(0.98rem, 1vw, 1.35rem);
  font-weight: 800;
  color: var(--ink);
}

.tip-card__desc {
  margin-top: clamp(6px, 0.5vw, 10px);
  font-size: clamp(0.84rem, 0.82vw, 1.1rem);
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ─── Brand Section ──────────────────────────── */

.brand-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(8px, 0.7vw, 14px);
  margin-bottom: clamp(24px, 2vw, 40px);
}

.brand-chip {
  display: inline-flex;
  align-items: center;
  height: clamp(38px, 3vw, 52px);
  padding: 0 clamp(16px, 1.4vw, 28px);
  border-radius: var(--pill);
  border: 1px solid rgba(155, 123, 239, 0.18);
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink-soft);
  font-family: var(--font);
  font-size: clamp(0.84rem, 0.85vw, 1.1rem);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
}

.brand-chip:hover {
  border-color: rgba(155, 123, 239, 0.4);
  background: rgba(255, 255, 255, 0.9);
}

.brand-chip[aria-pressed="true"] {
  background: linear-gradient(135deg, var(--purple-deep), var(--purple-primary));
  border-color: transparent;
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.brand-detail {
  max-width: min(900px, 80vw);
  margin: 0 auto;
}

.brand-detail__header {
  padding: clamp(20px, 1.8vw, 36px) clamp(22px, 2vw, 40px);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background: linear-gradient(135deg, rgba(243, 238, 255, 0.9), rgba(255, 255, 255, 0.9));
  border: 1px solid rgba(155, 123, 239, 0.15);
  border-bottom: none;
}

.brand-detail__name {
  font-size: clamp(1.15rem, 1.2vw, 1.7rem);
  font-weight: 800;
  color: var(--ink);
}

.brand-detail__note {
  margin-top: clamp(4px, 0.4vw, 8px);
  font-size: clamp(0.85rem, 0.85vw, 1.1rem);
  line-height: 1.6;
  color: var(--ink-soft);
}

.brand-detail__body {
  padding: clamp(22px, 2vw, 40px);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(155, 123, 239, 0.12);
  border-top: none;
  backdrop-filter: blur(8px);
}

.brand-section-title {
  font-size: clamp(0.95rem, 1vw, 1.3rem);
  font-weight: 800;
  color: var(--ink);
  margin-bottom: clamp(10px, 0.9vw, 18px);
}

.brand-step-list { display: grid; gap: clamp(8px, 0.7vw, 14px); }

.brand-step {
  display: grid;
  grid-template-columns: clamp(36px, 2.8vw, 52px) 1fr;
  gap: clamp(10px, 0.8vw, 16px);
  align-items: start;
  padding: clamp(12px, 1vw, 20px);
  border-radius: var(--radius-sm);
  background: rgba(243, 238, 255, 0.5);
  border: 1px solid rgba(155, 123, 239, 0.08);
}

.brand-step__idx {
  width: clamp(32px, 2.4vw, 46px);
  height: clamp(32px, 2.4vw, 46px);
  display: grid;
  place-items: center;
  border-radius: clamp(10px, 0.8vw, 14px);
  background: var(--purple-bg);
  color: var(--purple-deep);
  font-weight: 800;
  font-size: clamp(0.78rem, 0.78vw, 1rem);
}

.brand-step__text {
  font-size: clamp(0.84rem, 0.85vw, 1.1rem);
  line-height: 1.7;
  color: var(--ink-soft);
  padding-top: clamp(4px, 0.4vw, 8px);
}

.brand-note-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(10px, 0.8vw, 16px);
  margin-top: clamp(10px, 0.9vw, 18px);
}

.brand-note-card {
  padding: clamp(14px, 1.2vw, 24px);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(155, 123, 239, 0.1);
}

.brand-note-card__title {
  font-size: clamp(0.86rem, 0.88vw, 1.15rem);
  font-weight: 700;
  color: var(--ink);
}

.brand-note-card__desc {
  margin-top: clamp(4px, 0.4vw, 8px);
  font-size: clamp(0.8rem, 0.8vw, 1.05rem);
  line-height: 1.65;
  color: var(--ink-soft);
}

/* ─── CTA Card ───────────────────────────────── */

.cta-card {
  position: relative;
  text-align: center;
  padding: clamp(44px, 4.5vw, 88px) clamp(28px, 3vw, 60px);
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--purple-deep), var(--purple-primary));
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.cta-card__deco {
  position: absolute;
  top: -60px;
  right: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  pointer-events: none;
}

.cta-card__title {
  font-size: clamp(1.8rem, 3vw, 4rem);
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.03em;
}

.cta-card__desc {
  margin-top: clamp(10px, 0.9vw, 18px);
  font-size: clamp(0.95rem, 1vw, 1.35rem);
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.7;
}

.cta-card .btn--primary {
  margin-top: clamp(24px, 2.2vw, 44px);
  background: #fff;
  color: var(--purple-deep);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.15);
}

.cta-card .btn--primary:hover { box-shadow: 0 12px 36px rgba(0, 0, 0, 0.2); }

.cta-card__sub {
  margin-top: clamp(12px, 1vw, 20px);
  font-size: clamp(0.78rem, 0.78vw, 1rem);
  color: rgba(255, 255, 255, 0.65);
}

.cta-card__sub a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ─── 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-up {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── 响应式：平板 ──────────────────────────── */

@media (max-width: 1024px) {
  .steps-grid { grid-template-columns: repeat(2, 1fr); }

  .tips-grid {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
  }

  .brand-note-grid { grid-template-columns: 1fr; }
}

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

@media (max-width: 640px) {
  .slide { padding: 40px 16px; }

  .nav__inner { height: 60px; padding: 0 16px; }

  .brand__icon { width: 38px; height: 38px; font-size: 1rem; border-radius: 12px; }
  .brand__text { font-size: 1.05rem; }

  .slide--hero { padding-top: 32px; padding-bottom: 32px; }
  .hero__desc br { display: none; }
  .section-title br { display: none; }

  .btn--lg { height: 52px; padding: 0 24px; font-size: 1rem; }

  .hero__actions { flex-direction: column; align-items: center; }
  .hero__actions .btn { width: 100%; max-width: 320px; }

  .steps-grid { grid-template-columns: 1fr; max-width: 400px; margin-left: auto; margin-right: auto; }
  .step-card { padding: 22px 18px; }

  .brand-detail { max-width: none; }
  .brand-note-grid { grid-template-columns: 1fr; }

  .cta-card { padding: 36px 20px; border-radius: var(--radius-lg); }

  .footer__inner { flex-direction: column; text-align: center; gap: 12px; padding: 24px 16px; }
}