/* ============ 基础 ============ */
:root {
  --bg: #04060f;
  --bg-2: #070b1a;
  --panel: rgba(13, 20, 40, 0.72);
  --panel-solid: #0b1124;
  --line: rgba(90, 160, 255, 0.16);
  --line-strong: rgba(90, 200, 255, 0.45);
  --cyan: #22d3ee;
  --blue: #3b82f6;
  --purple: #8b5cf6;
  --pink: #ec4899;
  --green: #34d399;
  --amber: #fbbf24;
  --text: #e6f0ff;
  --text-dim: #94a8cc;
  --grad: linear-gradient(100deg, #22d3ee 0%, #3b82f6 45%, #8b5cf6 100%);
  --grad-text: linear-gradient(100deg, #67e8f9, #60a5fa 40%, #c084fc 80%);
  --radius: 18px;
  --shadow: 0 20px 60px rgba(2, 6, 20, 0.6);
  --font-en: "Rajdhani", "Noto Sans SC", sans-serif;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  font-family: "Noto Sans SC", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
img { max-width: 100%; display: block; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 860px; }

/* ============ 背景装饰 ============ */
.bg-grid {
  position: fixed; inset: 0; z-index: -3; pointer-events: none;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 75%);
}

.orb {
  position: fixed; z-index: -2; border-radius: 50%;
  filter: blur(90px); opacity: 0.35; pointer-events: none;
  animation: drift 18s ease-in-out infinite alternate;
}
.orb-1 { width: 520px; height: 520px; top: -120px; left: -140px; background: radial-gradient(circle, var(--blue), transparent 70%); }
.orb-2 { width: 460px; height: 460px; top: 30%; right: -160px; background: radial-gradient(circle, var(--purple), transparent 70%); animation-delay: -6s; }
.orb-3 { width: 420px; height: 420px; bottom: -140px; left: 30%; background: radial-gradient(circle, var(--cyan), transparent 70%); animation-delay: -12s; }

@keyframes drift {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(60px, 40px) scale(1.15); }
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 14px 26px; border-radius: 12px; font-weight: 700; font-size: 15px;
  letter-spacing: 0.02em; transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease, border-color 0.25s;
  position: relative; white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(100deg, #06b6d4, #3b82f6 55%, #7c3aed);
  color: #fff; border: 1px solid rgba(255,255,255,0.18);
  box-shadow: 0 10px 30px rgba(59, 130, 246, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 42px rgba(59, 130, 246, 0.5); }
.btn-outline {
  background: rgba(13, 20, 40, 0.5); color: var(--text);
  border: 1px solid var(--line-strong); backdrop-filter: blur(8px);
}
.btn-outline:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-2px); }
.btn-ghost {
  background: rgba(13, 20, 40, 0.6); color: var(--text); border: 1px solid var(--line);
  padding: 10px 16px; border-radius: 10px; font-size: 14px;
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-lg { padding: 18px 34px; font-size: 17px; }
.btn-num { font-family: var(--font-en); font-weight: 600; letter-spacing: 0.06em; }

/* ============ 导航 ============ */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 16px 0; transition: background 0.35s ease, box-shadow 0.35s ease, padding 0.35s ease;
}
.navbar.scrolled {
  background: rgba(4, 6, 15, 0.82);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
  box-shadow: 0 10px 40px rgba(0,0,0,0.4);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
  font-family: var(--font-en); font-weight: 800; font-size: 22px; letter-spacing: 0.08em;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
  border: 1px solid var(--line-strong); border-radius: 10px; padding: 4px 10px;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.35);
}
.logo-text { display: flex; flex-direction: column; line-height: 1.25; }
.logo-text strong { font-size: 17px; letter-spacing: 0.04em; }
.logo-text small { font-size: 11px; color: var(--text-dim); letter-spacing: 0.08em; }

.nav-links { display: flex; gap: 30px; }
.nav-links a {
  font-size: 15px; color: var(--text-dim); font-weight: 500; position: relative;
  transition: color 0.25s;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 2px;
  background: var(--grad); border-radius: 2px; transition: width 0.3s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: 14px; }
.lang-toggle {
  background: rgba(13, 20, 40, 0.6); color: var(--cyan); border: 1px solid var(--line-strong);
  border-radius: 10px; padding: 8px 14px; font-weight: 700; font-size: 14px; letter-spacing: 0.06em;
  transition: all 0.25s;
}
.lang-toggle:hover { box-shadow: 0 0 18px rgba(34, 211, 238, 0.4); transform: translateY(-1px); }

/* ============ Hero ============ */
.hero {
  position: relative; padding: 180px 0 90px; text-align: center;
}
.hero-tag {
  display: inline-flex; align-items: center; gap: 10px;
  border: 1px solid var(--line-strong); border-radius: 999px;
  padding: 8px 18px; font-size: 14px; color: var(--cyan);
  background: rgba(13, 20, 40, 0.55); backdrop-filter: blur(8px);
  margin-bottom: 28px;
}
.pulse-dot {
  width: 9px; height: 9px; border-radius: 50%; background: var(--green);
  box-shadow: 0 0 12px var(--green); animation: pulse 1.8s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}
.hero-title {
  font-size: clamp(42px, 7vw, 78px); line-height: 1.15; font-weight: 700; margin-bottom: 10px;
}
.grad-text {
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 30px rgba(96, 165, 250, 0.35));
}
.hero-sub {
  display: block; font-size: clamp(22px, 3.4vw, 38px); color: var(--text); font-weight: 600;
  font-family: var(--font-en); letter-spacing: 0.1em; margin-top: 6px;
}
.hero-desc {
  max-width: 720px; margin: 26px auto 40px; color: var(--text-dim); font-size: 17px;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-actions .btn-primary { flex-direction: column; gap: 2px; padding: 16px 34px; }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
  margin-top: 80px;
}
.stat {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 16px; backdrop-filter: blur(10px);
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.stat:hover { transform: translateY(-4px); border-color: var(--line-strong); }
.stat-num {
  display: block; font-family: var(--font-en); font-weight: 700; font-size: 40px; line-height: 1.1;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-label { color: var(--text-dim); font-size: 14px; margin-top: 6px; display: block; }

/* ============ 区块通用 ============ */
.section { padding: 100px 0; position: relative; }
.section-dark { background: linear-gradient(180deg, rgba(7, 11, 26, 0.4), rgba(7, 11, 26, 0.75)); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 60px; }
.section-eyebrow {
  display: inline-block; font-family: var(--font-en); font-weight: 600; letter-spacing: 0.28em;
  font-size: 13px; color: var(--cyan); margin-bottom: 14px;
  border: 1px solid var(--line); border-radius: 999px; padding: 6px 18px;
  background: rgba(13, 20, 40, 0.5);
}
.section-title { font-size: clamp(28px, 4vw, 42px); font-weight: 700; margin-bottom: 16px; }
.section-sub { color: var(--text-dim); font-size: 16px; }

/* ============ 什么是 FDE ============ */
.about-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 50px; align-items: start; }
.about-text p { color: var(--text-dim); margin-bottom: 18px; font-size: 16px; }
.about-points { display: flex; flex-direction: column; gap: 12px; margin-top: 24px; }
.point {
  display: flex; align-items: center; gap: 12px; background: var(--panel);
  border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; font-weight: 500;
}
.point-icon { font-size: 20px; }

.compare-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; backdrop-filter: blur(10px); box-shadow: var(--shadow);
}
.compare-card h3 { margin-bottom: 20px; font-size: 20px; }
.compare-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.compare-table th, .compare-table td { padding: 12px 10px; text-align: left; border-bottom: 1px solid var(--line); }
.compare-table thead th { color: var(--text-dim); font-weight: 600; font-size: 13px; }
.compare-table th.th-fde {
  background: linear-gradient(100deg, rgba(34,211,238,0.14), rgba(139,92,246,0.14));
  color: var(--cyan); border-radius: 8px;
}
.compare-table td:first-child { color: var(--text-dim); white-space: nowrap; }
.compare-table tr:last-child td { border-bottom: none; }

/* ============ 卡片网格 ============ */
.cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature-card {
  position: relative; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 26px; overflow: hidden;
  transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}
.feature-card::before {
  content: ""; position: absolute; inset: 0; opacity: 0; transition: opacity 0.35s;
  background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 0%), rgba(59,130,246,0.12), transparent 60%);
}
.feature-card:hover {
  transform: translateY(-6px); border-color: var(--line-strong);
  box-shadow: 0 18px 50px rgba(2, 6, 20, 0.6);
}
.feature-card:hover::before { opacity: 1; }
.fc-icon {
  width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  font-size: 24px; background: rgba(59,130,246,0.12); border: 1px solid var(--line-strong);
  margin-bottom: 18px;
}
.feature-card h3 { font-size: 19px; margin-bottom: 10px; }
.feature-card p { color: var(--text-dim); font-size: 14px; }
.fc-tag { position: absolute; top: 20px; right: 20px; font-family: var(--font-en); font-weight: 700; color: var(--text-dim); opacity: 0.5; }

/* ============ 案例 Tabs ============ */
.cases-tabs {
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 34px;
}
.case-tab {
  padding: 11px 22px; border-radius: 999px; border: 1px solid var(--line);
  background: rgba(13, 20, 40, 0.5); color: var(--text-dim); font-weight: 600; font-size: 14px;
  transition: all 0.3s ease;
}
.case-tab:hover { border-color: var(--cyan); color: var(--cyan); }
.case-tab.active {
  background: var(--grad); color: #fff; border-color: transparent;
  box-shadow: 0 8px 26px rgba(59, 130, 246, 0.35);
}
.case-panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: 22px;
  padding: 40px; backdrop-filter: blur(10px);
  animation: fadeSlide 0.4s ease;
}
@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}
.case-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 22px; }
.case-industry {
  font-size: 13px; font-weight: 700; color: var(--cyan);
  border: 1px solid var(--line-strong); border-radius: 8px; padding: 4px 12px;
  background: rgba(34,211,238,0.08);
}
.case-cycle { font-family: var(--font-en); color: var(--text-dim); font-size: 14px; margin-left: auto; }
.case-panel h3 { font-size: 24px; margin-bottom: 10px; }
.case-pain { color: var(--amber); font-size: 15px; margin-bottom: 24px; display: flex; gap: 8px; align-items: baseline; }
.case-pain b { font-family: var(--font-en); }
.case-body { display: grid; grid-template-columns: 1.15fr 1fr; gap: 30px; }
.case-solve h4, .case-result h4 {
  font-size: 15px; letter-spacing: 0.06em; color: var(--cyan); margin-bottom: 14px;
  display: flex; align-items: center; gap: 8px;
}
.solve-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.solve-list li {
  position: relative; padding-left: 26px; color: var(--text-dim); font-size: 14.5px;
}
.solve-list li::before {
  content: ""; position: absolute; left: 0; top: 8px; width: 14px; height: 2px;
  background: var(--grad); border-radius: 2px;
}
.result-grid { display: grid; gap: 14px; grid-template-columns: repeat(2, 1fr); }
.result-item {
  background: rgba(13, 20, 40, 0.6); border: 1px solid var(--line); border-radius: 14px;
  padding: 18px; text-align: center;
}
.result-item .r-num {
  font-family: var(--font-en); font-weight: 700; font-size: 30px; color: var(--green);
  display: block; line-height: 1.1;
}
.result-item .r-label { font-size: 13px; color: var(--text-dim); margin-top: 6px; display: block; }

/* ============ 流程时间线 ============ */
.timeline { position: relative; max-width: 900px; margin: 0 auto; }
.timeline::before {
  content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: 2px;
  transform: translateX(-50%); background: linear-gradient(180deg, var(--cyan), var(--purple));
  opacity: 0.35;
}
.tl-item { position: relative; width: 50%; padding: 0 44px 50px; }
.tl-item:nth-child(odd) { left: 0; text-align: right; }
.tl-item:nth-child(even) { left: 50%; text-align: left; }
.tl-dot {
  position: absolute; top: 6px; width: 16px; height: 16px; border-radius: 50%;
  background: var(--bg); border: 3px solid var(--cyan); box-shadow: 0 0 18px rgba(34,211,238,0.7);
}
.tl-item:nth-child(odd) .tl-dot { right: -8px; }
.tl-item:nth-child(even) .tl-dot { left: -8px; }
.tl-step { font-family: var(--font-en); font-weight: 700; color: var(--cyan); font-size: 14px; letter-spacing: 0.14em; }
.tl-item h3 { font-size: 20px; margin: 6px 0 10px; }
.tl-item p { color: var(--text-dim); font-size: 14.5px; }
.tl-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 16px;
  padding: 22px; display: inline-block; text-align: left; backdrop-filter: blur(8px);
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.tl-card:hover { transform: translateY(-4px); border-color: var(--line-strong); }

/* ============ 场景卡片 ============ */
.scenario-card { position: relative; overflow: hidden; }
.scenario-card .fc-icon { background: rgba(139,92,246,0.12); border-color: rgba(139,92,246,0.4); }
.scenario-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.scenario-tags span {
  font-size: 12px; color: var(--text-dim); border: 1px solid var(--line);
  border-radius: 999px; padding: 3px 12px;
}

/* ============ CTA ============ */
.cta { padding: 90px 0 110px; }
.cta-card {
  position: relative; text-align: center; overflow: hidden;
  background: linear-gradient(140deg, rgba(13,20,40,0.9), rgba(8,12,28,0.9));
  border: 1px solid var(--line-strong); border-radius: 26px; padding: 64px 40px;
  box-shadow: var(--shadow);
}
.cta-glow {
  position: absolute; width: 600px; height: 600px; top: -320px; left: 50%;
  transform: translateX(-50%); background: radial-gradient(circle, rgba(59,130,246,0.28), transparent 65%);
  pointer-events: none;
}
.cta-card h2 { font-size: clamp(26px, 4vw, 40px); margin-bottom: 18px; }
.cta-card p { color: var(--text-dim); max-width: 640px; margin: 0 auto 36px; font-size: 16px; }
.cta-actions { display: flex; align-items: center; justify-content: center; gap: 40px; flex-wrap: wrap; }
.cta-phone { display: flex; flex-direction: column; gap: 2px; text-align: left; }
.cta-phone > span:first-child { color: var(--text-dim); font-size: 13px; }
.phone-big {
  font-family: var(--font-en); font-weight: 700; font-size: 36px; letter-spacing: 0.04em;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.cta-phone > span:last-child { color: var(--text-dim); font-size: 12px; }

/* ============ FAQ ============ */
.faq-list { display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  overflow: hidden; transition: border-color 0.3s ease;
}
.faq-item.open { border-color: var(--line-strong); }
.faq-q {
  width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 16px;
  background: none; border: none; color: var(--text); font-size: 16px; font-weight: 600;
  padding: 20px 24px; text-align: left;
}
.faq-arrow { color: var(--cyan); font-size: 18px; transition: transform 0.3s ease; font-weight: 700; }
.faq-item.open .faq-arrow { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-a-inner { padding: 0 24px 22px; color: var(--text-dim); font-size: 14.5px; }

/* ============ 页脚 ============ */
.footer {
  border-top: 1px solid var(--line); background: rgba(4, 6, 15, 0.7);
  padding: 70px 0 30px; position: relative;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 50px; }
.footer-brand p { color: var(--text-dim); font-size: 14px; margin-top: 16px; }
.footer h4 { font-size: 15px; letter-spacing: 0.05em; margin-bottom: 18px; color: var(--text); }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { color: var(--text-dim); font-size: 14px; transition: color 0.25s; }
.footer-links a:hover { color: var(--cyan); }
.kw {
  display: inline-block; font-size: 12px; color: var(--text-dim); border: 1px solid var(--line);
  border-radius: 999px; padding: 3px 12px; margin: 0 6px 8px 0;
}
.footer-contact p { color: var(--text-dim); font-size: 14px; }
.footer-phone {
  font-family: var(--font-en); font-weight: 700; font-size: 26px; letter-spacing: 0.04em;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent;
  display: inline-block; margin: 8px 0;
}
.footer-bottom {
  border-top: 1px solid var(--line); padding-top: 26px; text-align: center;
}
.footer-bottom p { color: var(--text-dim); font-size: 13px; }

/* ============ 悬浮电话 ============ */
.float-phone {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  display: flex; align-items: center; gap: 10px;
  background: linear-gradient(100deg, #06b6d4, #3b82f6 60%, #7c3aed);
  color: #fff; padding: 15px 22px; border-radius: 999px; font-weight: 700;
  box-shadow: 0 12px 36px rgba(59, 130, 246, 0.5);
  animation: float 3.2s ease-in-out infinite;
}
.float-phone-text { font-family: var(--font-en); letter-spacing: 0.05em; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ============ 滚动显示动画 ============ */
.reveal {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .case-body { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 860px) {
  .nav-links { display: none; }
  .hero { padding-top: 150px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .timeline::before { left: 10px; }
  .tl-item, .tl-item:nth-child(even), .tl-item:nth-child(odd) {
    width: 100%; left: 0; text-align: left; padding: 0 0 40px 44px;
  }
  .tl-item:nth-child(odd) .tl-dot { left: 2px; right: auto; }
  .tl-item:nth-child(even) .tl-dot { left: 2px; }
}
@media (max-width: 640px) {
  .cards-grid { grid-template-columns: 1fr; }
  .hero-actions .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; }
  .case-panel { padding: 26px 20px; }
  .result-grid { grid-template-columns: repeat(2, 1fr); }
  .cta-actions { flex-direction: column; gap: 26px; }
  .cta-phone { text-align: center; }
  .float-phone-text { display: none; }
}