/* 随行客官网 — 黑白极简风格 */

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f7f7f7;
  --color-text: #1a1a1a;
  --color-text-muted: #666666;
  --color-text-light: #999999;
  --color-border: #e5e5e5;
  --color-black: #111111;
  --color-white: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1120px;
  --header-height: 64px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  color: var(--color-text-muted);
  transition: color 0.2s;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: transform 0.2s;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: opacity 0.2s, background 0.2s;
  font-family: inherit;
}

.btn-primary {
  background: var(--color-black);
  color: var(--color-white);
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-text);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* Sections */
.section {
  padding: 80px 24px;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-title {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  text-align: center;
}

.section-desc {
  font-size: 16px;
  color: var(--color-text-muted);
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

/* Hero */
.hero {
  padding: 100px 24px 80px;
  text-align: center;
}

.hero-inner {
  max-width: 720px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  font-size: 13px;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(40px, 8vw, 56px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: clamp(18px, 3vw, 22px);
  color: var(--color-text-muted);
  font-weight: 400;
  margin-bottom: 28px;
}

.hero-desc {
  font-size: 16px;
  color: var(--color-text-muted);
  line-height: 1.8;
  text-align: left;
  max-width: 640px;
  margin: 0 auto;
}

/* Feature cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color 0.2s;
}

.section-alt .feature-card {
  background: var(--color-white);
}

.feature-card:hover {
  border-color: #ccc;
}

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--color-black);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* Rules */
.rules-box {
  max-width: 720px;
  margin: 0 auto;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 40px;
}

.section-alt .rules-box {
  background: var(--color-bg);
}

.rules-box h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 20px;
  text-align: center;
}

.rules-list {
  list-style: none;
}

.rules-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 14px;
  font-size: 15px;
  color: var(--color-text-muted);
}

.rules-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--color-black);
  border-radius: 50%;
}

/* Phone mockups */
.phones-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: start;
}

.phone-wrap {
  text-align: center;
}

.phone-label {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 16px;
}

.phone-frame {
  width: 100%;
  max-width: 200px;
  margin: 0 auto;
  aspect-ratio: 9 / 19;
  background: var(--color-black);
  border-radius: 28px;
  padding: 10px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

.phone-screen {
  width: 100%;
  height: 100%;
  background: var(--color-white);
  border-radius: 20px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  font-size: 9px;
}

.phone-status {
  height: 20px;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 7px;
  color: var(--color-text-light);
}

.phone-content {
  flex: 1;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* Screen: Home browse */
.ui-search {
  height: 14px;
  background: var(--color-bg-alt);
  border-radius: 6px;
  border: 1px solid var(--color-border);
}

.ui-tabs {
  display: flex;
  gap: 4px;
}

.ui-tab {
  flex: 1;
  height: 10px;
  background: var(--color-bg-alt);
  border-radius: 4px;
}

.ui-tab.active {
  background: var(--color-black);
}

.ui-card {
  background: var(--color-bg-alt);
  border-radius: 6px;
  padding: 6px;
  border: 1px solid var(--color-border);
}

.ui-card-title {
  height: 6px;
  width: 70%;
  background: #ddd;
  border-radius: 2px;
  margin-bottom: 4px;
}

.ui-card-line {
  height: 4px;
  width: 90%;
  background: #eee;
  border-radius: 2px;
  margin-bottom: 3px;
}

.ui-card-price {
  height: 5px;
  width: 40%;
  background: var(--color-black);
  border-radius: 2px;
  margin-top: 4px;
}

/* Screen: Detail */
.ui-detail-img {
  height: 50px;
  background: var(--color-bg-alt);
  border-radius: 6px;
  border: 1px solid var(--color-border);
}

.ui-detail-title {
  height: 8px;
  width: 80%;
  background: #ddd;
  border-radius: 2px;
}

.ui-detail-block {
  height: 20px;
  background: var(--color-bg-alt);
  border-radius: 4px;
}

.ui-btn-book {
  margin-top: auto;
  height: 16px;
  background: var(--color-black);
  border-radius: 6px;
}

/* Screen: Messages */
.ui-msg-item {
  display: flex;
  gap: 6px;
  align-items: flex-start;
}

.ui-avatar {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  flex-shrink: 0;
}

.ui-bubble {
  flex: 1;
  background: var(--color-bg-alt);
  border-radius: 6px;
  padding: 5px;
  border: 1px solid var(--color-border);
}

.ui-bubble-line {
  height: 4px;
  background: #eee;
  border-radius: 2px;
  margin-bottom: 2px;
}

.ui-bubble-line:last-child {
  width: 60%;
  margin-bottom: 0;
}

/* Screen: Orders */
.ui-order {
  background: var(--color-bg-alt);
  border-radius: 6px;
  padding: 6px;
  border: 1px solid var(--color-border);
}

.ui-order-status {
  height: 5px;
  width: 50%;
  background: var(--color-black);
  border-radius: 2px;
  margin-bottom: 4px;
}

.ui-order-line {
  height: 4px;
  width: 80%;
  background: #eee;
  border-radius: 2px;
  margin-bottom: 2px;
}

.ui-order-actions {
  display: flex;
  gap: 4px;
  margin-top: 4px;
}

.ui-order-btn {
  flex: 1;
  height: 10px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-white);
}

/* Compliance & Contact */
.compliance-box,
.contact-box {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.compliance-box p,
.contact-box p {
  color: var(--color-text-muted);
  font-size: 15px;
  line-height: 1.8;
}

.contact-email {
  display: inline-block;
  margin-top: 16px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-text);
}

/* Legal pages */
.legal-page {
  padding: 48px 24px 80px;
}

.legal-inner {
  max-width: 720px;
  margin: 0 auto;
}

.legal-page h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
}

.legal-meta {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.legal-page h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 36px 0 14px;
}

.legal-page p {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 14px;
  line-height: 1.8;
}

.legal-page ul {
  margin: 0 0 14px 20px;
  color: var(--color-text-muted);
  font-size: 15px;
}

.legal-page li {
  margin-bottom: 8px;
  line-height: 1.7;
}

/* Footer */
.site-footer {
  background: var(--color-black);
  color: var(--color-white);
  padding: 48px 24px 32px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer-brand {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.footer-tagline {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 24px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  transition: color 0.2s;
}

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

.footer-copy {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.8;
}

.footer-icp {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.35);
  margin-top: 8px;
}

/* Responsive */
@media (max-width: 960px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .phones-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 56px 20px;
  }

  .hero {
    padding: 72px 20px 56px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: 16px 24px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

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

  .phones-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .rules-box {
    padding: 24px 20px;
  }

  .section-title {
    font-size: 24px;
  }

  .btn-group {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

@media (max-width: 400px) {
  .phones-grid {
    grid-template-columns: 1fr;
    max-width: 220px;
    margin: 0 auto;
  }
}