/* Mind 落地页样式
   配色直接沿用 App：画布 #141414 一族 + 精灵蓝 #78B3F9。
   字体用系统栈，不引外部字体——国内网络下外链字体经常静默失败。 */

:root {
  --canvas: #0f1012;
  --surface: #17191d;
  --surface-2: #1d2026;
  --text: #f4f5f7;
  --muted: #9aa1ab;
  --border: rgba(255, 255, 255, 0.09);
  --accent: #78b3f9;
  --accent-strong: #4f95ea;
  --warm: #e7d3b6;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --shadow-phone: 0 40px 80px -40px rgba(0, 0, 0, 0.9), 0 0 0 1px rgba(255, 255, 255, 0.06);
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(110% 70% at 50% -12%, rgba(120, 179, 249, 0.13), transparent 60%),
    var(--canvas);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.035;
  z-index: 1;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

.wrap {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}

/* ── 顶栏 ───────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(15, 16, 18, 0.72);
  backdrop-filter: saturate(1.6) blur(20px);
  -webkit-backdrop-filter: saturate(1.6) blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.02em;
  font-size: 17px;
}

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

.nav-links {
  display: flex;
  gap: 26px;
  margin-left: auto;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a {
  transition: color 160ms var(--ease);
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    transform 120ms var(--ease),
    background-color 160ms var(--ease),
    border-color 160ms var(--ease);
}

.btn:active {
  transform: scale(0.985);
}

.btn-primary {
  color: #08111d;
  background: linear-gradient(180deg, #a9cdfb, var(--accent) 55%, var(--accent-strong));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.55),
    0 18px 36px -18px rgba(120, 179, 249, 0.55);
}

.btn-primary:hover {
  filter: brightness(1.05);
}

.btn-ghost {
  border-color: var(--border);
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.06);
}

.btn-sm {
  height: 38px;
  padding: 0 16px;
  font-size: 13px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

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

.hero {
  padding: 96px 0 72px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 64px;
  align-items: center;
}

/* 网格子项默认 min-width:auto，会被 708px 宽的截图顶成 708px 的轨道，
   手机上整页因此横向溢出。显式归零，让图片按容器收窄。 */
.hero-grid > * {
  min-width: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 12px;
  margin-bottom: 26px;
}

.eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}

h1 {
  font-size: clamp(38px, 5.2vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.035em;
  font-weight: 600;
  margin: 0 0 24px;
  text-wrap: balance;
  overflow-wrap: anywhere;
}

h1 em {
  font-style: normal;
  color: var(--warm);
}

.lede {
  font-size: 18px;
  color: var(--muted);
  max-width: 34em;
  margin: 0 0 34px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.hero-note {
  margin-top: 18px;
  font-size: 13px;
  color: var(--muted);
}

/* 手机叠放：实拍截图，不加假 UI */
.phones {
  position: relative;
  min-height: 620px;
  min-width: 0;
}

.phone {
  position: absolute;
  width: 260px;
  border-radius: 38px;
  padding: 7px;
  background: linear-gradient(180deg, #24272d, #14161a);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow-phone);
}

.phone img {
  border-radius: 32px;
  width: 100%;
}

.phone-a {
  left: 8%;
  top: 0;
  z-index: 2;
}

.phone-b {
  right: 0;
  top: 96px;
  width: 232px;
  z-index: 1;
  transform: rotate(2.5deg);
}

.phones::before {
  content: "";
  position: absolute;
  inset: -10% -6% 0;
  background: radial-gradient(closest-side, rgba(120, 179, 249, 0.22), transparent);
  filter: blur(60px);
  z-index: 0;
}

/* ── 通用区块 ───────────────────────────────────────── */

section {
  padding: 88px 0;
  position: relative;
}

.section-head {
  max-width: 640px;
  margin-bottom: 52px;
}

h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.025em;
  font-weight: 600;
  margin: 0 0 16px;
  text-wrap: balance;
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

/* ── 步骤 ───────────────────────────────────────────── */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--border);
}

.step {
  padding: 28px 28px 28px 0;
  border-bottom: 1px solid var(--border);
}

.step + .step {
  padding-left: 28px;
  border-left: 1px solid var(--border);
}

.step-num {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 14px;
}

.step h3 {
  font-size: 19px;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.step p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

/* ── 功能清单 ───────────────────────────────────────── */

.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 48px;
}

.feature {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 16px;
  padding: 26px 0;
  border-top: 1px solid var(--border);
}

.feature:nth-last-child(-n + 2) {
  border-bottom: 1px solid var(--border);
}

.feature-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: rgba(120, 179, 249, 0.1);
  border: 1px solid rgba(120, 179, 249, 0.18);
  color: var(--accent);
}

.feature-icon svg {
  width: 18px;
  height: 18px;
}

.feature h3 {
  margin: 0 0 6px;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
}

/* ── 数据与隐私 ─────────────────────────────────────── */

.trust {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 56px;
  align-items: start;
  padding: 48px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.035), transparent 55%),
    var(--surface);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    0 40px 80px -60px rgba(0, 0, 0, 0.9);
}

.trust h2 {
  margin-bottom: 14px;
}

.trust p {
  color: var(--muted);
  margin: 0;
}

.trust-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.trust-list li {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 12px;
  font-size: 15px;
  color: #d5d9df;
}

.trust-list svg {
  width: 18px;
  height: 18px;
  color: var(--accent);
  margin-top: 3px;
}

/* ── FAQ ────────────────────────────────────────────── */

.faq {
  border-top: 1px solid var(--border);
}

details {
  border-bottom: 1px solid var(--border);
}

summary {
  list-style: none;
  cursor: pointer;
  padding: 22px 40px 22px 0;
  font-size: 17px;
  position: relative;
  letter-spacing: -0.01em;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 20px;
  transition: transform 200ms var(--ease);
}

details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

details p {
  margin: 0;
  padding: 0 40px 24px 0;
  color: var(--muted);
  font-size: 15px;
}

/* ── 收尾 CTA ───────────────────────────────────────── */

.cta {
  text-align: center;
  padding: 96px 0 112px;
}

.cta h2 {
  font-size: clamp(30px, 4vw, 46px);
}

.cta p {
  color: var(--muted);
  margin: 0 auto 30px;
  max-width: 30em;
}

/* ── 页脚 ───────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--border);
  padding: 36px 0 44px;
  font-size: 13px;
  color: var(--muted);
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 32px;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: 22px;
  margin-left: auto;
}

.footer-links a:hover {
  color: var(--text);
}

/* ── 文档页（隐私 / 条款 / 支持） ───────────────────── */

.doc {
  padding: 64px 0 96px;
  max-width: 780px;
}

.doc h1 {
  font-size: clamp(34px, 4vw, 46px);
  margin-bottom: 12px;
}

.doc .meta {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 40px;
}

.doc h2 {
  font-size: 22px;
  margin: 40px 0 12px;
  letter-spacing: -0.015em;
}

.doc h3 {
  font-size: 18px;
  margin: 28px 0 8px;
}

.doc p,
.doc li {
  color: #cfd4db;
  font-size: 16px;
}

.doc ul {
  padding-left: 22px;
}

.doc li {
  margin: 6px 0;
}

.doc a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.lang-split {
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.notice {
  border: 1px solid rgba(120, 179, 249, 0.25);
  background: rgba(120, 179, 249, 0.07);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  font-size: 14.5px;
  color: #cfd9e8;
  margin: 24px 0;
}

/* ── 响应式 ─────────────────────────────────────────── */

@media (max-width: 920px) {
  .hero {
    padding-top: 64px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .phones {
    min-height: 0;
    display: flex;
    gap: 16px;
    justify-content: center;
    padding-bottom: 20px;
  }

  .phone {
    position: static;
    width: min(46%, 260px);
  }

  .phone-b {
    width: min(38%, 220px);
    transform: none;
    margin-top: 40px;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .step {
    padding: 22px 0;
  }

  .step + .step {
    padding-left: 0;
    border-left: 0;
  }

  .features {
    grid-template-columns: 1fr;
  }

  .feature:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .feature:last-child {
    border-bottom: 1px solid var(--border);
  }

  .trust {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 28px;
  }

  section {
    padding: 64px 0;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  h1 {
    font-size: 38px;
  }

  .lede {
    font-size: 16px;
  }

  .wrap {
    width: calc(100% - 40px);
  }

  .nav-links {
    display: none;
  }

  .nav-inner {
    gap: 16px;
  }

  .hero {
    padding: 48px 0 40px;
  }

  .phones {
    flex-direction: column;
    align-items: center;
  }

  .phone,
  .phone-b {
    width: min(78%, 300px);
    margin-top: 0;
  }

  .cta {
    padding: 64px 0 80px;
  }

  .footer-links {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}