/* =========================================================
   Tweet 官网样式
   设计系统：暗色主题 + 紫蓝强调色 + iOS 原生美学
   ========================================================= */

/* -------- Reset & Base -------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

:root {
  /* 颜色 */
  --bg-root: #000000;
  --bg-elevated: #0a0a0f;
  --bg-card: #13131a;
  --bg-card-hover: #1a1a23;
  --bg-subtle: rgba(255, 255, 255, 0.04);

  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.68);
  --text-tertiary: rgba(255, 255, 255, 0.42);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);

  /* 紫蓝渐变 */
  --accent-1: #8b5cf6;
  --accent-2: #3b82f6;
  --accent-3: #6366f1;
  --gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #3b82f6 100%);
  --gradient-soft: linear-gradient(
    135deg,
    rgba(139, 92, 246, 0.15) 0%,
    rgba(59, 130, 246, 0.15) 100%
  );
  --gradient-text: linear-gradient(135deg, #a78bfa 0%, #60a5fa 100%);

  /* 尺寸 */
  --container: 1200px;
  --container-narrow: 880px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 999px;

  /* 阴影 */
  --shadow-glow: 0 0 60px rgba(139, 92, 246, 0.25);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);

  /* 动效 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 160ms;
  --dur: 240ms;
  --dur-slow: 400ms;
}

body {
  font-family:
    "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Display",
    "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui,
    sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-root);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
}

/* 中英文切换 */
body[data-lang="en"] .zh {
  display: none;
}
body[data-lang="zh"] .en {
  display: none;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}

button {
  font: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

ul,
ol {
  list-style: none;
}

/* -------- Layout helpers -------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
  position: relative;
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.6;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header .section-subtitle {
  margin: 0 auto;
}

/* -------- 导航栏 -------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.nav-logo img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 24px;
}

.nav-link {
  padding: 8px 14px;
  font-size: 14px;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--dur-fast) var(--ease);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--bg-subtle);
}

.nav-spacer {
  flex: 1;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 4px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
}

.lang-btn {
  padding: 6px 12px;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  transition: all var(--dur-fast) var(--ease);
}

.lang-btn.active {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06) inset;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--text-primary);
  color: #000;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: transform var(--dur-fast) var(--ease);
}

.nav-cta:hover {
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  position: relative;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
}

.nav-toggle span::before {
  top: -6px;
}
.nav-toggle span::after {
  top: 6px;
}

@media (max-width: 900px) {
  .nav-links,
  .nav-cta {
    display: none;
  }
  .nav-toggle {
    display: inline-flex;
  }
  .nav-mobile-open .nav-links {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin: 0;
    padding: 16px 24px;
    flex-direction: column;
    align-items: stretch;
    background: rgba(10, 10, 15, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    gap: 4px;
  }
  .nav-mobile-open .nav-link {
    padding: 12px 16px;
    font-size: 15px;
  }
}

/* -------- 按钮 -------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--dur) var(--ease);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(139, 92, 246, 0.55);
}

.btn-ghost {
  background: var(--bg-subtle);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-ghost:hover {
  background: var(--bg-card);
  border-color: var(--border-strong);
}

.btn svg {
  width: 18px;
  height: 18px;
}

/* -------- Hero -------- */
.hero {
  position: relative;
  padding: 160px 0 96px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(
    circle,
    rgba(139, 92, 246, 0.18) 0%,
    rgba(59, 130, 246, 0.1) 30%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 0;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero h1 .gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 20px;
  line-height: 1.55;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 520px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
}

.hero-meta {
  margin-top: 28px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-tertiary);
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-meta-item::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-1);
  box-shadow: 0 0 8px var(--accent-1);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 540px;
}

.phone {
  position: relative;
  width: 300px;
  height: 600px;
  border-radius: 44px;
  background: linear-gradient(
    135deg,
    rgba(139, 92, 246, 0.3) 0%,
    rgba(59, 130, 246, 0.3) 100%
  );
  padding: 10px;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.1) inset,
    0 30px 80px rgba(0, 0, 0, 0.6),
    0 0 100px rgba(139, 92, 246, 0.3);
  transform: rotate(-3deg);
}

.phone-screen {
  width: 100%;
  height: 100%;
  border-radius: 36px;
  background: #000;
  overflow: hidden;
  position: relative;
}

.phone-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}

.phone::before {
  content: "";
  position: absolute;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 24px;
  background: #000;
  border-radius: 12px;
  z-index: 2;
}

.floating-card {
  position: absolute;
  padding: 14px 18px;
  background: rgba(20, 20, 28, 0.85);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 500;
  animation: float 6s ease-in-out infinite;
}

.floating-card-1 {
  top: 80px;
  left: -20px;
  animation-delay: 0s;
}

.floating-card-2 {
  bottom: 100px;
  right: -30px;
  animation-delay: -2s;
}

.floating-card-3 {
  top: 280px;
  right: -50px;
  animation-delay: -4s;
}

.floating-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

@media (max-width: 900px) {
  .hero {
    padding: 120px 0 64px;
  }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
    text-align: center;
  }
  .hero-subtitle,
  .hero-cta,
  .hero-meta {
    justify-content: center;
  }
  .hero-meta {
    justify-content: center;
  }
  .hero-visual {
    min-height: 480px;
  }
  .floating-card-1 {
    left: 0;
  }
  .floating-card-2,
  .floating-card-3 {
    right: 0;
  }
}

/* -------- 三连点（价值主张） -------- */
.tri-features {
  padding: 80px 0;
  background: var(--bg-elevated);
  border-block: 1px solid var(--border-subtle);
}

.tri-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.tri-card {
  text-align: center;
  padding: 32px 24px;
}

.tri-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: var(--radius-lg);
  background: var(--gradient-soft);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-1);
}

.tri-icon svg {
  width: 28px;
  height: 28px;
}

.tri-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.tri-desc {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.55;
}

@media (max-width: 768px) {
  .tri-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

/* -------- 功能卡片网格 -------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  display: block;
  position: relative;
  padding: 32px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--dur) var(--ease);
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-soft);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
  pointer-events: none;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card > * {
  position: relative;
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--gradient-soft);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #c4b5fd;
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 22px;
  height: 22px;
}

.feature-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.feature-desc {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

.feature-card .arrow {
  position: absolute;
  top: 32px;
  right: 28px;
  width: 24px;
  height: 24px;
  color: var(--text-tertiary);
  transition: all var(--dur) var(--ease);
}

.feature-card:hover .arrow {
  color: var(--text-primary);
  transform: translate(2px, -2px);
}

@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* -------- 截图轮播 -------- */
.screenshots {
  background: var(--bg-elevated);
  border-block: 1px solid var(--border-subtle);
}

.screenshot-track {
  display: flex;
  gap: 32px;
  padding: 24px 0;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.screenshot-track::-webkit-scrollbar {
  display: none;
}

.screenshot-item {
  flex: 0 0 auto;
  width: 260px;
  height: 540px;
  border-radius: 32px;
  overflow: hidden;
  background: #000;
  scroll-snap-align: center;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
  transition: transform var(--dur) var(--ease);
}

.screenshot-item:hover {
  transform: translateY(-6px);
}

.screenshot-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}

/* -------- 差异点（Why Tweet） -------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.why-card {
  padding: 36px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.why-card::after {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 140px;
  height: 140px;
  background: var(--gradient-soft);
  filter: blur(40px);
  border-radius: 50%;
  opacity: 0.6;
  pointer-events: none;
}

.why-num {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-1);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.why-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.why-desc {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.6;
}

@media (max-width: 900px) {
  .why-grid {
    grid-template-columns: 1fr;
  }
}

/* -------- CTA 区块 -------- */
.cta-section {
  padding: 120px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    rgba(139, 92, 246, 0.2) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.cta-section > * {
  position: relative;
}

.cta-title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.cta-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

/* -------- 页脚 -------- */
.footer {
  padding: 64px 0 32px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-subtle);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(2, 1fr);
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 16px;
  max-width: 320px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 14px;
  transition: color var(--dur-fast) var(--ease);
}

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

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-tertiary);
  flex-wrap: wrap;
  gap: 16px;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* -------- 功能详情页 -------- */
.feature-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  padding: 80px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.feature-detail:nth-child(even) {
  direction: rtl;
}

.feature-detail:nth-child(even) > * {
  direction: ltr;
}

.feature-detail:last-child {
  border-bottom: none;
}

.feature-detail-content h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.feature-detail-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-1);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.feature-detail-desc {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 28px;
}

.feature-bullets {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.feature-bullets li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.5;
}

.feature-bullets li::before {
  content: "";
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  background: var(--gradient-primary);
  border-radius: 50%;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='white'><path d='M7.5 13.5L4 10l1.4-1.4l2.1 2.1l5.1-5.1L14 7z'/></svg>");
}

.feature-detail-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.feature-detail-visual .phone {
  width: 240px;
  height: 480px;
  transform: rotate(0);
}

@media (max-width: 900px) {
  .feature-detail {
    grid-template-columns: 1fr;
    gap: 48px;
    padding: 56px 0;
  }
  .feature-detail:nth-child(even) {
    direction: ltr;
  }
}

/* -------- 法律页 -------- */
.legal {
  padding: 140px 0 96px;
}

.legal-header {
  text-align: center;
  margin-bottom: 64px;
}

.legal-header h1 {
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.legal-header p {
  color: var(--text-secondary);
  font-size: 16px;
}

.legal-meta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.legal-body {
  max-width: 780px;
  margin: 0 auto;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.legal-body h2 {
  color: var(--text-primary);
  font-size: 22px;
  font-weight: 600;
  margin-top: 48px;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
  scroll-margin-top: 100px;
}

.legal-body h2:first-child {
  margin-top: 0;
}

.legal-body p {
  margin-bottom: 16px;
}

.legal-body ul,
.legal-body ol {
  margin: 16px 0;
  padding-left: 24px;
  list-style: disc;
}

.legal-body ol {
  list-style: decimal;
}

.legal-body li {
  margin-bottom: 8px;
}

.legal-body strong {
  color: var(--text-primary);
  font-weight: 600;
}

.legal-body a {
  color: var(--accent-1);
  border-bottom: 1px solid currentColor;
}

.legal-toc {
  max-width: 780px;
  margin: 0 auto 48px;
  padding: 28px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.legal-toc h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.legal-toc ol {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 24px;
  list-style: decimal;
  padding-left: 24px;
}

.legal-toc a {
  color: var(--text-secondary);
  font-size: 14px;
  transition: color var(--dur-fast) var(--ease);
}

.legal-toc a:hover {
  color: var(--text-primary);
}

@media (max-width: 600px) {
  .legal-toc ol {
    grid-template-columns: 1fr;
  }
}

/* -------- 联系我们页 -------- */
.contact-card {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
}

.contact-row {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.contact-row:last-child {
  border-bottom: none;
}

.contact-icon {
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--gradient-soft);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-1);
}

.contact-icon svg {
  width: 22px;
  height: 22px;
}

.contact-info h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.contact-info p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 4px;
}

.contact-info a {
  color: var(--accent-1);
  font-weight: 500;
  word-break: break-all;
}

.thanks {
  margin-top: 64px;
  padding: 32px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.thanks h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 16px;
}

.thanks p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.6;
  margin-bottom: 12px;
}

.thanks-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.thanks-tag {
  padding: 4px 12px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 12px;
  color: var(--text-secondary);
}

.sla-banner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: var(--gradient-soft);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  margin-top: 32px;
}

.sla-banner-icon {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.sla-banner-text h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.sla-banner-text p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

@media (max-width: 600px) {
  .contact-card {
    padding: 32px 24px;
  }
  .contact-row {
    gap: 16px;
  }
}

/* -------- App Store Badge -------- */
.appstore-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: #000;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  color: #fff;
  transition: all var(--dur) var(--ease);
}

.appstore-badge:hover {
  background: #1a1a1a;
  transform: translateY(-1px);
}

.appstore-badge svg {
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
}

.appstore-badge-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.1;
}

.appstore-badge-text small {
  font-size: 10px;
  opacity: 0.8;
  font-weight: 400;
}

.appstore-badge-text strong {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* -------- Utility -------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity var(--dur-slow) var(--ease),
    transform var(--dur-slow) var(--ease);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

::selection {
  background: rgba(139, 92, 246, 0.4);
  color: #fff;
}