/*! HTML5 Boilerplate v9.0.1 | MIT License | https://html5boilerplate.com/ */

/* ==========================================================================
   基础样式重置
   ========================================================================== */

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

html {
  color: #222;
  font-size: 1em;
  line-height: 1.4;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
  'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background-color: #f2f5f8;
  color: #272727;
  overflow-x: hidden;
}

::-moz-selection {
  background: #ffa400;
  color: #ffffff;
  text-shadow: none;
}

::selection {
  background: #ffa400;
  color: #ffffff;
  text-shadow: none;
}

/* ==========================================================================
   通用样式
   ========================================================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section-title {
  font-size: 3rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #ffa400 0%, #ffa600 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  text-align: center;
  font-size: 1.2rem;
  color: #757575;
  margin-bottom: 4rem;
}

/* ==========================================================================
   头部导航
   ========================================================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 253, 248, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(218, 199, 169, 0.34);
  box-shadow: 0 8px 30px rgba(93, 75, 45, 0.06);
  padding: 1rem 0;
  transition: all 0.3s ease;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffa400;
  margin: 0;
}

.nav {
  display: flex;
  gap: 2rem;
}

.nav a {
  color: #272727;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: #ffa400;
  transition: width 0.3s ease;
}

.nav a:hover {
  color: #ffa400;
}

.nav a:hover::after {
  width: 100%;
}

/* ==========================================================================
   主视觉区
   ========================================================================== */

.hero {
  position: relative;
  min-height: min(820px, 100svh);
  display: flex;
  align-items: center;
  background:
    radial-gradient(circle at 78% 38%, rgba(255, 187, 79, 0.23), transparent 32%),
    radial-gradient(circle at 8% 18%, rgba(255, 218, 158, 0.32), transparent 29%),
    linear-gradient(135deg, #fffaf2 0%, #fffdf9 48%, #f3f9ff 100%);
  overflow: hidden;
  padding: 132px 0 72px;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.7;
  background-image:
    linear-gradient(rgba(230, 176, 86, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(230, 176, 86, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, #000, transparent 88%);
}

.hero-layout {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(560px, 1.12fr);
  align-items: center;
  gap: 40px;
}

.hero-copy {
  position: relative;
  z-index: 3;
  padding: 32px 0;
  animation: fadeInUp 0.7s ease-out both;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  margin-bottom: 24px;
  border: 1px solid rgba(225, 151, 34, 0.2);
  border-radius: 999px;
  color: #8a5a11;
  background: rgba(255, 255, 255, 0.72);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  backdrop-filter: blur(12px);
}

.hero-eyebrow-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ffad18;
  box-shadow: 0 0 0 5px rgba(255, 173, 24, 0.14);
}

.hero-title {
  max-width: 650px;
  font-size: clamp(3.25rem, 5vw, 5rem);
  font-weight: 800;
  margin: 0 0 24px;
  line-height: 1.08;
  letter-spacing: -0.055em;
  color: #26352f;
  text-shadow: none;
}

.hero-title span {
  color: #c96f05;
  background: linear-gradient(90deg, #c96f05 0%, #e98a16 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-description {
  max-width: 580px;
  margin: 0 0 32px;
  color: #52615a;
  font-size: 1.08rem;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 38px;
}

.hero-btn {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 22px;
  border-radius: 12px;
  text-decoration: none;
  font-size: 0.98rem;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.hero-btn svg {
  width: 19px;
  height: 19px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.hero-btn-primary {
  color: #ffffff;
  background: linear-gradient(135deg, #e98a16 0%, #c96f05 100%);
  box-shadow: 0 12px 28px rgba(201, 111, 5, 0.2);
}

.hero-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(201, 111, 5, 0.28);
}

.hero-btn-secondary {
  color: #52615a;
  border: 1px solid rgba(89, 109, 120, 0.17);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 8px 24px rgba(70, 91, 103, 0.08);
}

.hero-btn-secondary:hover {
  transform: translateY(-2px);
  background: #ffffff;
}

.hero-proof {
  display: flex;
  align-items: center;
  gap: 24px;
}

.proof-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.proof-item strong {
  color: #26352f;
  font-size: 1.18rem;
}

.proof-item span {
  color: #76827c;
  font-size: 0.82rem;
}

.proof-divider {
  width: 1px;
  height: 34px;
  background: rgba(77, 99, 111, 0.14);
}

.client-showcase {
  position: relative;
  min-height: 570px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  animation: fadeInUp 0.8s ease-out 0.15s both;
}

.showcase-orbit {
  position: absolute;
  border: 1px solid rgba(239, 165, 45, 0.24);
  border-radius: 50%;
}

.orbit-one {
  width: 520px;
  height: 520px;
  top: 22px;
  right: -45px;
}

.orbit-two {
  width: 390px;
  height: 390px;
  top: 86px;
  right: 20px;
  border-color: rgba(77, 126, 151, 0.11);
}

.desktop-app {
  position: relative;
  z-index: 2;
  width: min(630px, 100%);
  min-height: 440px;
  overflow: hidden;
  border: 1px solid rgba(70, 91, 103, 0.13);
  border-radius: 22px;
  background: #f7f9fa;
  box-shadow: 0 35px 85px rgba(76, 92, 103, 0.18), 0 0 0 8px rgba(255, 255, 255, 0.72);
  transform: perspective(1400px) rotateY(-4deg) rotateX(1deg);
}

.app-titlebar {
  height: 55px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  color: #43515a;
  background: #ffffff;
  border-bottom: 1px solid #e8edef;
}

.window-controls {
  display: flex;
  gap: 7px;
}

.window-controls span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ffb8b1;
}

.window-controls span:nth-child(2) { background: #ffd17e; }
.window-controls span:nth-child(3) { background: #8cdb9a; }

.app-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
}

.app-brand img {
  width: 26px;
  height: 26px;
  object-fit: contain;
}

.app-titlebar-action {
  color: #a1adb3;
  letter-spacing: 2px;
}

.app-body {
  min-height: 385px;
  display: grid;
  grid-template-columns: 175px 1fr;
}

.app-sidebar {
  padding: 20px 14px;
  color: #6f7e86;
  background: linear-gradient(180deg, #fffaf0 0%, #f5f8fa 100%);
  border-right: 1px solid #e8edef;
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 7px 20px;
  margin-bottom: 12px;
  border-bottom: 1px solid rgba(74, 94, 105, 0.1);
}

.sidebar-avatar {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: #7d4e00;
  background: #ffb323;
  font-weight: 800;
}

.sidebar-user div,
.selected-node div,
.showcase-badge div,
.mobile-node div {
  display: flex;
  flex-direction: column;
}

.sidebar-user strong {
  color: #34444d;
  font-size: 0.8rem;
}

.sidebar-user small {
  color: #8c9aa2;
  font-size: 0.64rem;
}

.sidebar-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 12px;
  margin: 5px 0;
  border-radius: 9px;
  font-size: 0.76rem;
}

.sidebar-nav span {
  width: 18px;
  color: #7f949f;
  text-align: center;
}

.sidebar-nav.active {
  color: #9a6100;
  background: rgba(255, 173, 24, 0.16);
}

.sidebar-nav.active span {
  color: #ffad18;
}

.app-dashboard {
  padding: 24px 36px 20px;
  color: #263943;
  text-align: center;
  background:
    radial-gradient(circle at 50% 33%, rgba(255, 173, 24, 0.11), transparent 33%),
    #f7f9fa;
}

.connection-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 11px;
  border-radius: 999px;
  color: #397552;
  background: #e9f7ee;
  font-size: 0.7rem;
  font-weight: 700;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #43b36d;
  box-shadow: 0 0 0 4px rgba(67, 179, 109, 0.12);
}

.connect-ring {
  width: 132px;
  height: 132px;
  display: grid;
  place-items: center;
  margin: 14px auto 8px;
  border: 1px solid rgba(255, 173, 24, 0.2);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.62);
  box-shadow: 0 0 0 12px rgba(255, 173, 24, 0.055), 0 14px 35px rgba(70, 55, 30, 0.11);
}

.connect-core {
  width: 88px;
  height: 88px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #ffffff;
  background: linear-gradient(145deg, #ffc345, #ff9f0a);
  box-shadow: 0 14px 30px rgba(255, 159, 10, 0.34);
}

.connect-core svg,
.mobile-connect-ring svg {
  width: 38px;
  height: 38px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
}

.connection-time {
  display: block;
  margin-bottom: 12px;
  color: #82919a;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
}

.selected-node {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid #e5eaed;
  border-radius: 12px;
  background: #ffffff;
  text-align: left;
  box-shadow: 0 7px 20px rgba(37, 55, 65, 0.05);
}

.node-flag {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: #ffffff;
  background: #e9504f;
  font-size: 0.65rem;
  font-weight: 800;
}

.selected-node strong {
  font-size: 0.72rem;
}

.selected-node small {
  color: #8d9aa1;
  font-size: 0.62rem;
}

.node-signal {
  margin-left: auto;
  color: #43b36d;
  font-size: 0.75rem;
}

.speed-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 10px;
}

.speed-row div {
  padding: 8px 10px;
  border-radius: 10px;
  background: #edf1f3;
  text-align: left;
}

.speed-row small {
  display: block;
  color: #8b989f;
  font-size: 0.58rem;
}

.speed-row strong {
  color: #334851;
  font-size: 0.8rem;
}

.speed-row em {
  color: #8b989f;
  font-size: 0.55rem;
  font-style: normal;
  font-weight: 500;
}

.mobile-app {
  position: absolute;
  z-index: 4;
  right: -24px;
  bottom: 12px;
  width: 176px;
  height: 348px;
  padding: 28px 14px 18px;
  overflow: hidden;
  border: 6px solid #f7f9fa;
  border-radius: 30px;
  color: #25363f;
  background: linear-gradient(180deg, #ffffff 0%, #eef3f5 100%);
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.35);
  text-align: center;
}

.mobile-notch {
  position: absolute;
  top: 7px;
  left: 50%;
  width: 52px;
  height: 11px;
  border-radius: 999px;
  background: #1b2b34;
  transform: translateX(-50%);
}

.mobile-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  margin: 7px 0 20px;
  font-size: 0.7rem;
  font-weight: 800;
}

.mobile-brand img {
  width: 22px;
  height: 22px;
  object-fit: contain;
}

.mobile-status {
  color: #84959e;
  font-size: 0.58rem;
}

.mobile-connect-ring {
  width: 82px;
  height: 82px;
  display: grid;
  place-items: center;
  margin: 12px auto 8px;
  border-radius: 50%;
  color: #ffffff;
  background: linear-gradient(145deg, #ffc345, #ff9f0a);
  box-shadow: 0 12px 28px rgba(255, 159, 10, 0.3), 0 0 0 10px rgba(255, 173, 24, 0.08);
}

.mobile-connect-ring svg {
  width: 32px;
  height: 32px;
}

.mobile-connected {
  color: #3a7652;
  font-size: 0.7rem;
}

.mobile-node {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px;
  margin-top: 22px;
  border: 1px solid #dfe7ea;
  border-radius: 11px;
  background: #ffffff;
  text-align: left;
}

.mobile-node > span {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #ffffff;
  background: #e9504f;
  font-size: 0.55rem;
  font-weight: 800;
}

.mobile-node strong {
  font-size: 0.58rem;
}

.mobile-node small {
  color: #8a9aa2;
  font-size: 0.48rem;
}

.showcase-badge {
  position: absolute;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 13px;
  border: 1px solid rgba(67, 88, 99, 0.12);
  border-radius: 13px;
  color: #33444d;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 18px 40px rgba(78, 98, 109, 0.16);
  backdrop-filter: blur(16px);
}

.showcase-badge > span {
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: #ffffff;
  background: #f5a30b;
  font-size: 0.85rem;
  font-weight: 800;
}

.showcase-badge strong {
  font-size: 0.68rem;
}

.showcase-badge small {
  color: #82919a;
  font-size: 0.55rem;
}

.badge-fast {
  top: 44px;
  right: 34px;
}

.badge-safe {
  left: 10px;
  bottom: 42px;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  pointer-events: none;
}

.hero-glow-left {
  width: 360px;
  height: 360px;
  left: -220px;
  top: 12%;
  background: rgba(255, 179, 45, 0.12);
}

.hero-glow-right {
  width: 420px;
  height: 420px;
  right: -240px;
  bottom: -120px;
  background: rgba(105, 178, 216, 0.1);
}

/* ==========================================================================
   功能特色
   ========================================================================== */

.features {
  padding: 8rem 0;
  background: #ffffff;
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
  margin-top: 3rem;
}

.feature-card {
  background: #ffffff;
  border: 2px solid #f2f5f8;
  border-radius: 20px;
  padding: 2.5rem;
  text-align: center;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 164, 0, 0.05) 0%, rgba(255, 166, 0, 0.05) 100%);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.feature-card:hover {
  transform: translateY(-10px);
  border-color: #ffa400;
  box-shadow: 0 20px 40px rgba(255, 164, 0, 0.15);
}

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

.feature-icon {
  font-size: 4rem;
  margin-bottom: 1.5rem;
  filter: grayscale(0);
  transition: all 0.3s ease;
  position: relative;
  z-index: 1;
}

.feature-card:hover .feature-icon {
  transform: scale(1.1);
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: #272727;
  position: relative;
  z-index: 1;
  font-weight: 700;
}

.feature-card p {
  color: #757575;
  line-height: 1.8;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   应用场景
   ========================================================================== */

.use-cases {
  padding: 8rem 0;
  background: linear-gradient(180deg, #f2f5f8 0%, #e8ecf1 100%);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 3rem;
  margin-top: 3rem;
}

.use-case-card {
  background: #ffffff;
  border-radius: 20px;
  padding: 2.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.use-case-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 25px rgba(255, 164, 0, 0.15);
  border-color: #ffa400;
}

.use-case-icon {
  font-size: 4rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

.use-case-card h3 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: #272727;
  font-weight: 700;
  text-align: center;
}

.use-case-card > p {
  color: #757575;
  line-height: 1.8;
  margin-bottom: 1.5rem;
  text-align: center;
}

.use-case-list {
  list-style: none;
  padding: 0;
}

.use-case-list li {
  padding: 0.75rem 0;
  color: #272727;
  border-bottom: 1px solid #f2f5f8;
  position: relative;
  padding-left: 1.5rem;
}

.use-case-list li:last-child {
  border-bottom: none;
}

.use-case-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #ffa400;
  font-weight: 700;
}

/* ==========================================================================
   下载区域
   ========================================================================== */

.download {
  padding: 8rem 0;
  background: #ffffff;
  text-align: center;
}

.download-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.download-card {
  background: #ffffff;
  border: 2px solid #f2f5f8;
  border-radius: 20px;
  padding: 3rem 2rem;
  text-align: center;
  transition: all 0.4s ease;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
}

.download-card:hover {
  transform: translateY(-10px);
  border-color: #ffa400;
  box-shadow: 0 20px 40px rgba(255, 164, 0, 0.15);
}

.download-card-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.download-card-icon svg {
  width: 48px;
  height: 48px;
  color: #ffffff;
}

.android-icon {
  background: linear-gradient(135deg, #3DDC84 0%, #2E7D32 100%);
}

.mac-icon {
  background: linear-gradient(135deg, #000000 0%, #333333 100%);
}

.windows-icon {
  background: linear-gradient(135deg, #0078D4 0%, #005A9E 100%);
}

.download-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: #272727;
  font-weight: 700;
}

.download-card p {
  color: #757575;
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.download-card-btn {
  display: inline-block;
  padding: 0.8rem 2rem;
  background: linear-gradient(135deg, #ffa400 0%, #ffa600 100%);
  color: #ffffff;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(255, 164, 0, 0.3);
}

.download-card-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(255, 164, 0, 0.4);
}
/* 下载直链展示 */
.download-direct {
  margin-top: 2rem;
  text-align: left;
  background: #f8fafc;
  border: 1px solid #eef2f7;
  border-radius: 12px;
  padding: 1rem 1.25rem;
}

.download-direct-title {
  font-weight: 700;
  color: #272727;
  margin-bottom: 0.75rem;
}

.download-direct-item {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  padding: 0.35rem 0;
  border-top: 1px dashed #e6e9ef;
}

.download-direct-item:first-child {
  border-top: none;
}

.download-direct-label {
  min-width: 90px;
  color: #555;
  font-weight: 600;
}

.download-direct-link {
  color: #ffa400;
  text-decoration: none;
  word-break: break-all;
}

.download-direct-link:hover {
  text-decoration: underline;
}


/* ==========================================================================
   联系我们
   ========================================================================== */

.contact {
  padding: 6rem 0;
  background: #ffffff;
  text-align: center;
}

.contact-content {
  max-width: 800px;
  margin: 0 auto;
}

.contact-text {
  font-size: 1.1rem;
  color: #555;
  line-height: 1.8;
  margin-top: 1.5rem;
  margin-bottom: 3rem;
}

.contact-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem;
  background: #f8f9fa;
  border-radius: 12px;
  transition: all 0.3s ease;
  text-align: left;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.contact-item:hover {
  background: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.contact-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffa400;
  border-radius: 12px;
  flex-shrink: 0;
}

.contact-icon img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.contact-icon svg {
  width: 24px;
  height: 24px;
  color: #fff;
}

.contact-info h4 {
  margin: 0 0 0.5rem 0;
  font-size: 1.1rem;
  color: #272727;
  font-weight: 600;
}

.contact-info p {
  margin: 0;
  font-size: 0.95rem;
  color: #666;
}

@media (max-width: 768px) {
  .contact-list {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .contact-item {
    padding: 1.25rem;
  }
}

/* ==========================================================================
   关于我们
   ========================================================================== */

.about {
  padding: 8rem 0;
  background: linear-gradient(180deg, #f2f5f8 0%, #e8ecf1 100%);
}

.about-content {
  max-width: 900px;
  margin: 0 auto;
}

.about-text {
  font-size: 1.1rem;
  line-height: 1.8;
  color: #272727;
  margin-bottom: 2rem;
  text-align: center;
}

.about-values {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.value-item {
  background: #ffffff;
  padding: 2rem;
  border-radius: 15px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
  border: 2px solid transparent;
  transition: all 0.3s ease;
}

.value-item:hover {
  border-color: #ffa400;
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(255, 164, 0, 0.15);
}

.value-item h4 {
  font-size: 1.3rem;
  color: #ffa400;
  margin-bottom: 1rem;
  font-weight: 700;
}

.value-item p {
  color: #757575;
  line-height: 1.6;
}

/* ==========================================================================
   页脚
   ========================================================================== */

.footer {
  padding: 4rem 0 2rem;
  background: #272727;
  color: #ffffff;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-logo h3 {
  font-size: 1.5rem;
  color: #ffa400;
  margin-bottom: 1rem;
  font-weight: 700;
}

.footer-logo p {
  color: #AAAAAA;
  font-size: 0.95rem;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2rem;
}

.footer-column h4 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: #ffffff;
  font-weight: 600;
}

.footer-column a {
  display: block;
  color: #AAAAAA;
  text-decoration: none;
  margin-bottom: 0.5rem;
  transition: color 0.3s ease;
}

.footer-column a:hover {
  color: #ffa400;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
  color: #AAAAAA;
  font-size: 0.9rem;
}

/* ==========================================================================
   响应式设计
   ========================================================================== */

@media only screen and (max-width: 1024px) {
  .section-title {
    font-size: 2.5rem;
  }

  .hero {
    min-height: auto;
    padding: 130px 0 84px;
  }

  .hero-layout {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .hero-copy {
    max-width: 720px;
    text-align: center;
    margin: 0 auto;
    padding-bottom: 4px;
  }

  .hero-title,
  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions,
  .hero-proof {
    justify-content: center;
  }

  .client-showcase {
    width: min(720px, 100%);
    min-height: 535px;
    margin: 0 auto;
  }
}

@media only screen and (max-width: 768px) {
  .section-title {
    font-size: 2rem;
  }

  .section-subtitle {
    font-size: 1rem;
  }

  .nav {
    display: none;
  }

  .hero-title {
    font-size: clamp(2.65rem, 11vw, 4rem);
  }

  .hero-description {
    font-size: 1rem;
  }

  .client-showcase {
    min-height: 490px;
    padding-right: 24px;
  }

  .desktop-app {
    min-height: 390px;
    transform: none;
  }

  .app-body {
    min-height: 335px;
    grid-template-columns: 145px 1fr;
  }

  .app-sidebar {
    padding: 18px 10px;
  }

  .app-dashboard {
    padding: 22px 24px 16px;
  }

  .mobile-app {
    right: -2px;
    bottom: 3px;
    transform: scale(0.88);
    transform-origin: right bottom;
  }

  .badge-fast {
    top: 23px;
    right: 0;
  }

  .badge-safe {
    left: 0;
    bottom: 22px;
  }

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

  .download-cards {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media only screen and (max-width: 480px) {
  .header .container {
    flex-direction: row;
  }

  .logo h1 {
    font-size: 1.2rem;
  }

  .header {
    padding: 0.75rem 0;
  }

  .hero {
    padding: 100px 0 56px;
  }

  .hero-copy {
    text-align: left;
  }

  .hero-eyebrow {
    margin-bottom: 18px;
    font-size: 0.75rem;
  }

  .hero-title {
    font-size: clamp(2.35rem, 12vw, 3.2rem);
    letter-spacing: -0.045em;
  }

  .hero-description {
    font-size: 0.95rem;
    line-height: 1.75;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .hero-btn {
    width: 100%;
  }

  .hero-proof {
    justify-content: space-between;
    gap: 10px;
  }

  .proof-divider {
    height: 30px;
  }

  .proof-item strong {
    font-size: 1rem;
  }

  .proof-item span {
    font-size: 0.7rem;
  }

  .client-showcase {
    min-height: 400px;
    padding: 0;
    margin-top: 12px;
  }

  .desktop-app {
    min-height: 325px;
    border-radius: 17px;
  }

  .app-titlebar {
    height: 48px;
  }

  .app-body {
    min-height: 277px;
    grid-template-columns: 1fr;
  }

  .app-sidebar,
  .speed-row {
    display: none;
  }

  .app-dashboard {
    padding: 18px 74px 15px 20px;
  }

  .connect-ring {
    width: 110px;
    height: 110px;
  }

  .connect-core {
    width: 74px;
    height: 74px;
  }

  .mobile-app {
    right: -12px;
    bottom: -4px;
    transform: scale(0.68);
  }

  .showcase-badge {
    display: none;
  }

  .orbit-one {
    width: 360px;
    height: 360px;
    right: -120px;
  }

  .orbit-two {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-copy,
  .client-showcase {
    animation: none;
  }

  .hero-btn {
    transition: none;
  }
}

/* ==========================================================================
   辅助类
   ========================================================================== */

.hidden,
[hidden] {
  display: none !important;
}

.visually-hidden {
  border: 0;
  clip: rect(0, 0, 0, 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

/* ==========================================================================
   页面内容样式（使用帮助、联系我们）
   ========================================================================== */

.page-content {
  min-height: 100vh;
  padding: 120px 0 60px;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.page-content-wrapper {
  max-width: 900px;
  margin: 0 auto;
  background: white;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  padding: 3rem;
}

.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 2rem;
  background: linear-gradient(135deg, #ffa400 0%, #ffa600 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-body {
  line-height: 1.8;
  color: #333;
  font-size: 1.1rem;
}

.page-body h1,
.page-body h2,
.page-body h3 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: #ffa400;
}

.page-body h1 {
  font-size: 2rem;
}

.page-body h2 {
  font-size: 1.5rem;
}

.page-body h3 {
  font-size: 1.25rem;
}

.page-body p {
  margin-bottom: 1rem;
}

.page-body ul,
.page-body ol {
  margin: 1rem 0;
  padding-left: 2rem;
}

.page-body li {
  margin-bottom: 0.5rem;
}

.page-body a {
  color: #ffa400;
  text-decoration: none;
  transition: color 0.3s ease;
}

.page-body a:hover {
  color: #ff8c00;
  text-decoration: underline;
}

.page-body code {
  background: #f5f5f5;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
}

.page-body pre {
  background: #f5f5f5;
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1rem 0;
}

.page-body blockquote {
  border-left: 4px solid #ffa400;
  padding-left: 1rem;
  margin: 1rem 0;
  color: #666;
  font-style: italic;
}

.page-back {
  text-align: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid #eee;
}

.page-back .btn {
  min-width: 150px;
}

@media (max-width: 768px) {
  .page-content-wrapper {
    padding: 2rem 1.5rem;
  }

  .page-title {
    font-size: 2rem;
  }

  .page-body {
    font-size: 1rem;
  }
}