/* ========== 基础 ========== */
:root {
  --primary: #4874CB;
  --primary-dark: #35599E;
  --teal: #30C0B4;
  --orange: #EE822F;
  --ink: #44546A;
  --ink-light: #6B7A90;
  --bg: #ffffff;
  --bg-alt: #F4F7FB;
  --bg-dark: #0D1828;
  --bg-dark-2: #12203A;
  --line: #E3E9F2;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(28, 50, 90, 0.08);
  --shadow-hover: 0 16px 40px rgba(28, 50, 90, 0.14);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ========== 导航栏 ========== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(227, 233, 242, 0.8);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.nav-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nav-logo-icon {
  width: 34px;
  height: 34px;
  display: inline-block;
  overflow: hidden;
  flex-shrink: 0;
}

.nav-logo-icon img {
  display: block;
  width: 47px;
  max-width: none;
  height: auto;
  transform: translate(-6px, -4px);
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 12px;
  padding: 6px 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}

.nav-logo img { width: 34px; height: 34px; object-fit: contain; }

.nav-name {
  color: #22314A;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  color: var(--ink-light);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s ease;
  position: relative;
}

.nav-links a:hover { color: var(--primary); }

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: var(--teal);
  transition: width 0.25s ease;
}

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

.nav.scrolled {
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 2px 18px rgba(20, 40, 80, 0.1);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 22px; height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: background 0.3s ease;
}

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 660px;
  padding: 78px 24px 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  background: #f1f5fd;
}

.hero-shell {
  position: relative;
  z-index: 1;
  width: min(1160px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  align-items: center;
  gap: clamp(38px, 6vw, 88px);
}

.hero-content {
  color: var(--ink);
  padding: 22px 0 10px;
  max-width: 570px;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--primary-dark);
  border: 1px solid #cbdaf3;
  border-radius: 100px;
  padding: 7px 14px 7px 11px;
  margin-bottom: 24px;
  background: rgba(255, 255, 255, 0.72);
}

.hero-eyebrow span {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--primary);
  vertical-align: 1px;
}

.hero-title {
  font-size: clamp(38px, 5vw, 64px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -1px;
  color: #16243b;
  margin-bottom: 24px;
}

.hero-title em {
  color: var(--primary);
  font-style: normal;
}

.hero-sub {
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-light);
  margin-bottom: 30px;
}

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

.btn {
  display: inline-block;
  padding: 13px 34px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 24px rgba(72, 116, 203, 0.45);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.btn-ghost {
  color: var(--primary-dark);
  border: 1.5px solid #b7cbed;
  background: rgba(255, 255, 255, 0.58);
}

.btn-ghost:hover { background: #fff; transform: translateY(-2px); }

.hero-actions .btn span { margin-left: 8px; font-size: 14px; }

.hero-proof {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 40px;
  color: #65738a;
  font-size: 13px;
}

.hero-proof-label { color: #314566; font-weight: 700; }
.hero-proof i { width: 3px; height: 3px; border-radius: 50%; background: #a9b7ca; }

.hero-media { min-width: 0; }

.hero-media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10.2;
  border: 8px solid rgba(255, 255, 255, 0.82);
  border-radius: 18px;
  background: #0c1728;
  box-shadow: 0 24px 64px rgba(42, 75, 135, 0.2), 0 5px 16px rgba(42, 75, 135, 0.08);
}

.hero-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(8, 21, 40, 0.24), transparent 36%, rgba(8, 21, 40, 0.38));
}

.hero-media-topline, .hero-media-caption {
  position: absolute;
  z-index: 1;
  color: #fff;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

.hero-media-topline {
  top: 16px;
  left: 18px;
  font-size: 13px;
  font-weight: 600;
}

.hero-live-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 7px;
  border-radius: 50%;
  background: #61e0b2;
  box-shadow: 0 0 0 4px rgba(97, 224, 178, 0.18);
  vertical-align: 1px;
}

.hero-media-caption {
  left: 18px;
  right: 18px;
  bottom: 16px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 13px;
}

.hero-media-caption strong { font-size: 15px; }
.hero-media-note { margin: 13px 2px 0; color: #6b7a90; font-size: 13px; }

.hero-trust {
  position: relative;
  z-index: 1;
  width: min(1160px, 100%);
  margin: 18px auto 0;
  padding-top: 18px;
  border-top: 1px solid rgba(169, 183, 202, 0.42);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: #6b7a90;
  font-size: 14px;
}

.hero-trust-label { color: #8a98aa; font-size: 12px; letter-spacing: 1px; }

.hero-scroll {
  display: none;
  position: absolute;
  bottom: 23px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 34px;
  border: 1px solid #b8c8df;
  border-radius: 12px;
  text-decoration: none;
  animation: bounce 2s infinite;
  z-index: 2;
}

.hero-scroll span { display: block; width: 3px; height: 6px; margin: 7px auto 0; border-radius: 2px; background: var(--primary); }

@keyframes bounce {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

/* ========== 通用 Section ========== */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: linear-gradient(160deg, var(--bg-dark) 0%, var(--bg-dark-2) 100%); }

.section-head { text-align: center; max-width: 760px; margin: 0 auto 56px; }

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-dark .section-tag { color: var(--teal); }

.section-title { font-size: clamp(26px, 3.6vw, 38px); font-weight: 800; color: #22314A; margin-bottom: 16px; }
.section-title.light { color: #fff; }

.section-desc { font-size: 16.5px; color: var(--ink-light); }
.section-desc.light { color: rgba(255, 255, 255, 0.72); }

/* ========== 网格 ========== */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ========== 痛点卡片 ========== */
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 28px;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }

.card-icon {
  width: 54px; height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary) 0%, var(--teal) 100%);
  border-radius: 14px;
  margin-bottom: 20px;
}

.card h3 { font-size: 19px; color: #22314A; margin-bottom: 10px; }
.card p { font-size: 15px; color: var(--ink-light); }

/* 对比条 */
.contrast {
  margin-top: 48px;
  display: flex;
  align-items: stretch;
  gap: 20px;
  background: #fff;
  border-radius: var(--radius);
  padding: 30px 32px;
  box-shadow: var(--shadow);
}

.contrast-item { flex: 1; display: flex; gap: 18px; align-items: flex-start; }

.contrast-label {
  flex-shrink: 0;
  font-size: 13px;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 100px;
  margin-top: 3px;
}

.contrast-label.ok { background: #E8F0FA; color: var(--primary-dark); }
.contrast-label.gap { background: #FDEFDF; color: #C05F0E; }

.contrast-item h4 { font-size: 17px; color: #22314A; margin-bottom: 4px; }
.contrast-item p { font-size: 14.5px; color: var(--ink-light); }

.contrast-item.highlight h4 { color: var(--primary); }

.contrast-arrow {
  align-self: center;
  font-size: 26px;
  color: var(--primary);
  font-weight: 700;
}

/* ========== 产品流程 ========== */
.flow {
  display: flex;
  align-items: stretch;
  gap: 12px;
  margin-bottom: 48px;
}

.flow-step {
  flex: 1;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 22px;
  text-align: center;
  position: relative;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

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

.flow-num {
  width: 36px; height: 36px;
  margin: 0 auto 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 16px;
}

.flow-step h4 { font-size: 16.5px; color: #22314A; margin-bottom: 6px; }
.flow-step p { font-size: 13.5px; color: var(--ink-light); }

.flow-arrow {
  align-self: center;
  color: var(--primary);
  font-size: 22px;
  font-weight: 700;
  flex-shrink: 0;
}

.feature {
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 28px 30px;
  box-shadow: var(--shadow);
}

.feature h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  color: #22314A;
  margin-bottom: 10px;
}

.feature-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--teal));
  flex-shrink: 0;
}

.feature p { font-size: 15px; color: var(--ink-light); }

/* ========== 演示视频 ========== */
.video-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

.video-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.video-card:hover { transform: translateY(-4px); box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35); }

.video-card video {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  display: block;
}

.video-card figcaption { padding: 22px 24px; }

.video-card figcaption h3 { font-size: 18px; color: #fff; margin-bottom: 6px; }
.video-card figcaption p { font-size: 14.5px; color: rgba(255, 255, 255, 0.65); }

/* ========== 应用场景 ========== */
.scene-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.scene-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }

.scene-img { aspect-ratio: 4 / 3; overflow: hidden; }

.scene-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.scene-card:hover .scene-img img { transform: scale(1.06); }

.scene-body { padding: 20px 22px; }

.scene-body h3 { font-size: 17.5px; color: #22314A; margin-bottom: 6px; }
.scene-body p { font-size: 13.8px; color: var(--ink-light); }

/* ========== 时间线 ========== */
.timeline {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
  padding-left: 36px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--primary), var(--teal));
  border-radius: 2px;
}

.timeline-item { position: relative; padding: 0 0 44px 24px; }
.timeline-item:last-child { padding-bottom: 0; }

.timeline-node {
  position: absolute;
  left: -36px;
  top: 6px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  border: 4px solid var(--primary);
  box-shadow: 0 0 0 5px rgba(72, 116, 203, 0.15);
}

.timeline-date {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  background: #E8F0FA;
  border-radius: 100px;
  padding: 3px 16px;
  margin-bottom: 10px;
}

.timeline-body {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 26px;
  box-shadow: var(--shadow);
}

.timeline-body h3 { font-size: 18px; color: #22314A; margin-bottom: 6px; }
.timeline-body p { font-size: 15px; color: var(--ink-light); }

/* ========== 团队 ========== */
.member {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 28px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.member:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }

.member-photo {
  width: 130px; height: 130px;
  margin: 0 auto 20px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid #E8F0FA;
  box-shadow: 0 6px 18px rgba(28, 50, 90, 0.12);
}

.member-photo img { width: 100%; height: 100%; object-fit: cover; }

.member-photo.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--teal));
  color: #fff;
  font-size: 52px;
  font-weight: 700;
}

.member h3 { font-size: 19px; color: #22314A; margin-bottom: 12px; }
.member-role {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--primary);
  background: #E8F0FA;
  padding: 2px 12px;
  border-radius: 100px;
  margin-left: 6px;
  vertical-align: 2px;
}

.member p { font-size: 14.5px; color: var(--ink-light); text-align: left; }

/* ========== 合作单位 ========== */
.partners {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  max-width: 620px;
  margin: 0 auto;
}

.partner {
  height: 110px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 1px;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.partner:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: #C7D7F0; }

.partner-logo img { max-height: 56px; max-width: 70%; object-fit: contain; }

/* ========== 页脚 ========== */
.footer {
  background: var(--bg-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 56px 0 28px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  flex-wrap: wrap;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand { display: flex; align-items: center; gap: 16px; }

.footer-brand h3 { color: #fff; font-size: 20px; letter-spacing: 2px; }
.footer-brand p { font-size: 14px; margin-top: 2px; }

.footer-contact h4 { color: #fff; font-size: 15px; margin-bottom: 8px; }
.footer-contact p { font-size: 14.5px; }

.todo-mark { color: var(--orange); font-size: 12.5px; margin-left: 6px; }

.footer-bottom { padding-top: 24px; text-align: center; font-size: 13.5px; color: rgba(255, 255, 255, 0.45); }

/* ========== 滚动渐显 ========== */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ========== 响应式 ========== */
@media (max-width: 960px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: 1fr; }
  .partners { grid-template-columns: repeat(2, 1fr); }
  .flow { flex-wrap: wrap; }
  .flow-step { flex: 1 1 40%; }
  .flow-arrow { display: none; }
  .hero { min-height: 630px; }
  .hero-shell { gap: 34px; }
  .hero-title { font-size: clamp(36px, 5vw, 54px); }
  .hero-sub { font-size: 15.5px; }
}

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 0; right: -280px;
    width: 260px;
    height: 100vh;
    background: #fff;
    flex-direction: column;
    gap: 8px;
    padding: 90px 30px 30px;
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.12);
    transition: right 0.3s ease;
  }
  .nav-links.open { right: 0; }
  .nav-links a { color: var(--ink) !important; font-size: 16px; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .nav-toggle span { transition: transform 0.25s ease, opacity 0.25s ease, background 0.3s ease; }
}

@media (max-width: 680px) {
  .section { padding: 68px 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .contrast { flex-direction: column; gap: 14px; }
  .contrast-arrow { transform: rotate(90deg); align-self: center; }
  .flow-step { flex: 1 1 100%; }
  .hero {
    min-height: auto;
    padding: 106px 20px 28px;
  }
  .hero-shell { grid-template-columns: 1fr; gap: 34px; }
  .hero-content { padding-top: 0; }
  .hero-title { font-size: clamp(38px, 12vw, 52px); }
  .hero-sub { font-size: 15px; line-height: 1.75; }
  .hero-sub br { display: none; }
  .hero-proof { margin-top: 28px; flex-wrap: wrap; gap: 9px; }
  .hero-media-frame { border-width: 5px; border-radius: 13px; }
  .hero-media-caption { display: block; }
  .hero-media-caption span { display: block; margin-top: 3px; }
  .hero-trust { margin-top: 40px; padding-top: 18px; justify-content: flex-start; flex-wrap: wrap; gap: 10px 18px; }
  .hero-trust-label { width: 100%; }
  .hero-scroll { display: none; }
  .nav-inner { padding-left: 20px; padding-right: 20px; }
  .nav-name { font-size: 17px; }
  .footer-top { flex-direction: column; }
}