/* ═══════════════════════════════════════════════════
   AI开发工作室 · 深色科技风全局样式
   ═══════════════════════════════════════════════════ */

:root {
  --bg-deep: #06060b;
  --bg-primary: #0a0a14;
  --bg-card: #111122;
  --bg-card-hover: #161630;
  --bg-elevated: #1a1a35;
  --border: #1e1e3a;
  --border-light: #2a2a48;
  --accent: #6C5CE7;
  --accent-glow: rgba(108,92,231,0.3);
  --accent2: #00D2FF;
  --accent2-glow: rgba(0,210,255,0.25);
  --text: #e4e4ec;
  --text2: #9090a8;
  --text3: #606078;
  --green: #00E676;
  --orange: #FF9100;
  --red: #FF5252;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px var(--accent-glow);
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --max-width: 1200px;
  --nav-height: 64px;
}

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

html { scroll-behavior:smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC","Microsoft YaHei", sans-serif;
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color:inherit; text-decoration:none; }
img { max-width:100%; display:block; }
ul { list-style:none; }

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

/* ── 按钮 ─────────────────────────────────────── */
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:10px 24px; border-radius:8px; font-size:14px; font-weight:600;
  cursor:pointer; transition:var(--transition); border:none;
  white-space:nowrap; text-decoration:none; letter-spacing:0.3px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #8B7CF6);
  color:#fff; box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover { transform:translateY(-2px); box-shadow: 0 6px 32px var(--accent-glow); }
.btn-outline {
  background:transparent; color:var(--text);
  border:1px solid var(--border-light);
}
.btn-outline:hover { border-color:var(--accent); color:var(--accent); background:rgba(108,92,231,0.06); }
.btn-lg { padding:14px 36px; font-size:16px; border-radius:10px; }
.btn-sm { padding:6px 16px; font-size:12px; border-radius:6px; }
.btn-ghost { background:rgba(108,92,231,0.08); color:var(--accent); }
.btn-ghost:hover { background:rgba(108,92,231,0.15); }

/* ── 导航栏 ───────────────────────────────────── */
.navbar {
  position:fixed; top:0; left:0; right:0; z-index:1000;
  height:var(--nav-height);
  background:rgba(10,10,20,0.85);
  backdrop-filter:blur(16px);
  border-bottom:1px solid transparent;
  transition:var(--transition);
}
.navbar.scrolled { border-bottom-color:var(--border); box-shadow:0 1px 20px rgba(0,0,0,0.5); }
.navbar .container { display:flex; align-items:center; height:100%; }

.nav-logo {
  display:flex; align-items:center; gap:10px; font-size:20px; font-weight:700;
  color:var(--text); flex-shrink:0; letter-spacing:0.5px;
}
.nav-logo .logo-dot {
  width:34px; height:34px; border-radius:10px;
  background:linear-gradient(135deg, var(--accent), var(--accent2));
  display:flex; align-items:center; justify-content:center;
  color:#fff; font-size:16px; font-weight:800;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.nav-links { display:flex; gap:4px; margin-left:40px; }
.nav-links a {
  padding:8px 16px; border-radius:8px; font-size:13.5px; color:var(--text2);
  transition:var(--transition); font-weight:500;
}
.nav-links a:hover, .nav-links a.active { color:var(--text); background:rgba(255,255,255,0.04); }

.nav-actions { margin-left:auto; display:flex; gap:10px; align-items:center; }

.menu-toggle {
  display:none; width:40px; height:40px; border:none; background:none;
  cursor:pointer; flex-direction:column; justify-content:center; gap:5px; padding:8px;
}
.menu-toggle span { display:block; width:22px; height:2px; background:var(--text); border-radius:2px; transition:var(--transition); }

/* ── 区块通用 ─────────────────────────────────── */
.section { padding:88px 0; }
.section-alt { background:var(--bg-primary); }

.section-tag {
  display:inline-block; padding:4px 14px; border-radius:20px;
  font-size:12px; font-weight:600; letter-spacing:1px; text-transform:uppercase;
  background:rgba(108,92,231,0.1); color:var(--accent);
  margin-bottom:16px; border:1px solid rgba(108,92,231,0.2);
}

.section-header { margin-bottom:56px; }
.section-header h2 { font-size:32px; font-weight:800; margin-bottom:12px; letter-spacing:-0.5px; }
.section-header p { font-size:16px; color:var(--text2); max-width:600px; }
.section-header.center { text-align:center; }
.section-header.center p { margin:0 auto; }

/* ── Hero ─────────────────────────────────────── */
.hero {
  position:relative; overflow:hidden;
  padding:140px 0 100px;
  background:var(--bg-deep);
}
.hero::before {
  content:''; position:absolute; top:0; left:50%; transform:translateX(-50%);
  width:800px; height:800px;
  background:radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events:none;
}
.hero .container { position:relative; z-index:1; text-align:center; }
.hero h1 {
  font-size:52px; font-weight:900; line-height:1.15; letter-spacing:-1px;
  background:linear-gradient(135deg, #fff 0%, #b8b8d0 50%, var(--accent2) 100%);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
  background-clip:text;
  max-width:750px; margin:0 auto 20px;
}
.hero .hero-sub {
  font-size:17px; color:var(--text2); max-width:560px; margin:0 auto 36px; line-height:1.7;
}
.hero .btn-group { display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }

/* 几何装饰 */
.hero-mesh {
  position:absolute; bottom:-60px; right:-40px;
  width:300px; height:300px; opacity:0.06;
  border:1px solid var(--accent);
  border-radius:50%;
  animation: float 8s ease-in-out infinite;
}
.hero-mesh2 {
  position:absolute; top:60px; left:-60px;
  width:200px; height:200px; opacity:0.04;
  border:2px solid var(--accent2);
  border-radius:40px; transform:rotate(30deg);
  animation: float 10s ease-in-out infinite reverse;
}
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-20px)} }

/* ── 流程可视化 ───────────────────────────────── */
.process-row {
  display:flex; gap:20px; justify-content:center; flex-wrap:wrap;
}
.process-card {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius-lg); padding:28px 22px;
  text-align:center; flex:1; min-width:200px; max-width:240px;
  position:relative; transition:var(--transition);
}
.process-card:hover {
  transform:translateY(-4px); border-color:var(--accent);
  box-shadow:var(--shadow-glow);
}
.process-card .step-num {
  width:44px; height:44px; border-radius:50%;
  background:linear-gradient(135deg, var(--accent), #8B7CF6);
  display:flex; align-items:center; justify-content:center;
  font-size:18px; font-weight:800; color:#fff;
  margin:0 auto 16px;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.process-card .step-arrow {
  position:absolute; right:-30px; top:50%; transform:translateY(-50%);
  font-size:20px; color:var(--text3);
}
.process-card:last-child .step-arrow { display:none; }
.process-card h4 { font-size:15px; font-weight:700; margin-bottom:6px; }
.process-card p { font-size:12.5px; color:var(--text2); line-height:1.6; }

/* ── 卡片网格 ─────────────────────────────────── */
.card-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(260px, 1fr)); gap:20px; }
.card {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius-lg); padding:28px;
  transition:var(--transition);
}
.card:hover { border-color:var(--accent); transform:translateY(-2px); box-shadow:0 4px 24px rgba(0,0,0,0.3); }
.card .card-icon { font-size:32px; margin-bottom:16px; }
.card h3 { font-size:17px; font-weight:700; margin-bottom:8px; }
.card p { font-size:13.5px; color:var(--text2); line-height:1.7; }

/* ── 对比表 ───────────────────────────────────── */
.compare-table {
  width:100%; border-collapse:collapse; font-size:14px;
  border:1px solid var(--border); border-radius:var(--radius); overflow:hidden;
}
.compare-table th {
  padding:14px 18px; text-align:left; font-weight:600;
  background:var(--bg-elevated); border-bottom:1px solid var(--border);
}
.compare-table th:first-child { width:25%; }
.compare-table td { padding:12px 18px; border-bottom:1px solid var(--border); color:var(--text2); }
.compare-table tr:last-child td { border-bottom:none; }
.compare-table .check { color:var(--green); }
.compare-table .cross { color:var(--red); }
.compare-table .highlight-col { background:rgba(108,92,231,0.04); }

/* ── 代码对比块 ───────────────────────────────── */
.code-compare {
  display:grid; grid-template-columns:1fr 1fr; gap:20px;
}
.code-block {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); overflow:hidden;
}
.code-block .code-header {
  padding:10px 16px; border-bottom:1px solid var(--border);
  display:flex; align-items:center; gap:8px; font-size:12px;
}
.code-block .code-header .dot { width:10px; height:10px; border-radius:50%; }
.code-block .code-header .dot.red { background:var(--red); }
.code-block .code-header .dot.yellow { background:var(--orange); }
.code-block .code-header .dot.green { background:var(--green); }
.code-block .code-header .label { color:var(--text2); margin-left:8px; }
.code-block pre {
  padding:16px; font-family:"JetBrains Mono","Fira Code",monospace;
  font-size:12px; line-height:1.7; color:var(--text2); overflow-x:auto;
}
.code-block pre .keyword { color:var(--accent); }
.code-block pre .string { color:var(--green); }
.code-block pre .comment { color:var(--text3); }
.code-block.good { border-color:rgba(0,230,118,0.2); }
.code-block.good .code-header { background:rgba(0,230,118,0.04); }
.code-block.bad { border-color:rgba(255,82,82,0.2); }
.code-block.bad .code-header { background:rgba(255,82,82,0.04); }

/* ── 服务卡片 ─────────────────────────────────── */
.service-card {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius-lg); padding:32px;
  transition:var(--transition); position:relative; overflow:hidden;
}
.service-card::before {
  content:''; position:absolute; top:0; left:0; right:0; height:2px;
  background:linear-gradient(90deg, var(--accent), var(--accent2));
  opacity:0; transition:var(--transition);
}
.service-card:hover::before { opacity:1; }
.service-card:hover { border-color:var(--border-light); transform:translateY(-2px); }
.service-card .svc-icon { font-size:40px; margin-bottom:16px; }
.service-card h3 { font-size:20px; font-weight:700; margin-bottom:8px; }
.service-card .svc-tag {
  display:inline-block; padding:3px 10px; border-radius:6px;
  font-size:11px; font-weight:600; background:rgba(108,92,231,0.1); color:var(--accent);
  margin-bottom:12px;
}
.service-card .svc-price {
  font-size:24px; font-weight:800; color:var(--accent2);
  margin:16px 0 12px;
}
.service-card .svc-detail { font-size:13px; color:var(--text2); line-height:1.7; }
.service-card .svc-meta { display:flex; gap:20px; margin-top:16px; padding-top:16px; border-top:1px solid var(--border); }
.service-card .svc-meta span { font-size:12px; color:var(--text3); }
.service-card .svc-meta strong { color:var(--text); }

/* ── 案例卡片 ─────────────────────────────────── */
.case-card {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius-lg); overflow:hidden;
  transition:var(--transition);
}
.case-card:hover { border-color:var(--accent); transform:translateY(-3px); }
.case-card .case-thumb {
  height:180px; background:var(--bg-elevated);
  display:flex; align-items:center; justify-content:center;
  font-size:60px; border-bottom:1px solid var(--border);
}
.case-card .case-body { padding:20px; }
.case-card .case-tags { display:flex; gap:6px; flex-wrap:wrap; margin-bottom:10px; }
.case-card .case-tags span {
  padding:2px 8px; border-radius:4px; font-size:11px; font-weight:600;
  background:rgba(108,92,231,0.1); color:var(--accent);
}
.case-card h4 { font-size:16px; font-weight:700; margin-bottom:6px; }
.case-card p { font-size:13px; color:var(--text2); }

/* ── 时间线 ───────────────────────────────────── */
.timeline {
  position:relative; padding-left:40px;
  border-left:2px solid var(--border);
  max-width:700px; margin:0 auto;
}
.timeline-item { margin-bottom:36px; position:relative; }
.timeline-item::before {
  content:attr(data-step);
  position:absolute; left:-52px; top:0;
  width:28px; height:28px; border-radius:50%;
  background:var(--bg-card); border:2px solid var(--accent);
  display:flex; align-items:center; justify-content:center;
  font-size:12px; font-weight:700; color:var(--accent);
}
.timeline-item h4 { font-size:17px; font-weight:700; margin-bottom:4px; }
.timeline-item p { font-size:13px; color:var(--text2); }

/* ── 标语条 ───────────────────────────────────── */
.trust-bar {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:20px 28px;
  display:flex; justify-content:center; gap:40px; flex-wrap:wrap;
}
.trust-bar .trust-item {
  font-size:14px; font-weight:600; color:var(--text);
  display:flex; align-items:center; gap:8px;
}
.trust-bar .trust-item .icon { font-size:18px; }

/* ── 留言表单 ─────────────────────────────────── */
.contact-grid { display:grid; grid-template-columns:1fr 1.2fr; gap:40px; }
.contact-info { display:flex; flex-direction:column; gap:20px; }
.contact-info h3 { font-size:22px; font-weight:700; }
.contact-info p { font-size:14px; color:var(--text2); line-height:1.7; }
.contact-info .info-row { display:flex; gap:12px; align-items:center; font-size:14px; color:var(--text2); }
.contact-info .info-row .icon { font-size:20px; }

.contact-form {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius-lg); padding:32px;
}
.form-group { margin-bottom:16px; }
.form-group label { display:block; font-size:13px; font-weight:600; margin-bottom:6px; color:var(--text2); }
.form-group input, .form-group select, .form-group textarea {
  width:100%; padding:10px 14px;
  background:var(--bg-primary); border:1px solid var(--border);
  border-radius:8px; font-size:14px; color:var(--text);
  outline:none; font-family:inherit; transition:var(--transition);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color:var(--accent); box-shadow:0 0 0 3px var(--accent-glow);
}
.form-group textarea { resize:vertical; min-height:100px; }
.form-submit { width:100%; }

/* ── FAQ ──────────────────────────────────────── */
.faq-item { border-bottom:1px solid var(--border); }
.faq-question {
  padding:16px 0; font-size:15px; font-weight:600; cursor:pointer;
  display:flex; justify-content:space-between; align-items:center;
  user-select:none; transition:var(--transition);
}
.faq-question:hover { color:var(--accent); }
.faq-answer { max-height:0; overflow:hidden; transition:max-height 0.35s ease; }
.faq-item.open .faq-answer { max-height:300px; }
.faq-answer p { padding:0 0 16px; font-size:13.5px; color:var(--text2); line-height:1.7; }

/* ── 页脚 ─────────────────────────────────────── */
.footer {
  background:var(--bg-primary); border-top:1px solid var(--border);
  padding:48px 0 24px;
}
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px; margin-bottom:32px; }
.footer h4 { color:var(--text); font-size:14px; font-weight:600; margin-bottom:14px; }
.footer a { color:var(--text2); font-size:13px; display:block; padding:4px 0; transition:var(--transition); }
.footer a:hover { color:var(--accent); }
.footer .footer-brand { font-size:20px; font-weight:700; color:var(--text); margin-bottom:10px; }
.footer .footer-desc { font-size:13px; color:var(--text2); line-height:1.7; max-width:260px; }
.footer-bottom {
  border-top:1px solid var(--border); padding-top:20px;
  display:flex; justify-content:space-between; font-size:12px; color:var(--text3);
  flex-wrap:wrap; gap:8px;
}

/* ── 弹窗 ─────────────────────────────────────── */
.modal-overlay {
  position:fixed; inset:0; background:rgba(0,0,0,0.7); z-index:1000;
  display:flex; align-items:center; justify-content:center;
}
.modal {
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius-lg);
  width:90%; max-width:500px; overflow:hidden;
}
.modal-header {
  padding:14px 20px; border-bottom:1px solid var(--border);
  display:flex; justify-content:space-between; align-items:center; font-weight:600;
}
.modal-close { background:none; border:none; color:var(--text2); font-size:20px; cursor:pointer; }
.modal-body { padding:20px; }

/* ── 响应式 ───────────────────────────────────── */
@media(max-width:1024px) {
  .code-compare { grid-template-columns:1fr; }
  .contact-grid { grid-template-columns:1fr; }
  .process-row { gap:12px; }
  .process-card { min-width:140px; }
  .process-card .step-arrow { display:none; }
}
@media(max-width:768px) {
  .nav-links { display:none; }
  .nav-links.open {
    display:flex; flex-direction:column; position:absolute;
    top:var(--nav-height); left:0; right:0; background:var(--bg-primary);
    padding:12px; border-bottom:1px solid var(--border); gap:2px; margin-left:0;
    box-shadow:0 8px 32px rgba(0,0,0,0.6);
  }
  .menu-toggle { display:flex; }
  .hero h1 { font-size:30px; }
  .hero .hero-sub { font-size:15px; }
  .section { padding:56px 0; }
  .section-header h2 { font-size:24px; }
  .footer-grid { grid-template-columns:1fr 1fr; }
  .stats-row { flex-direction:column; gap:24px; }
}
@media(max-width:480px) {
  .hero h1 { font-size:24px; }
  .hero .btn-group { flex-direction:column; align-items:center; }
  .footer-grid { grid-template-columns:1fr; }
  .container { padding:0 16px; }
  .trust-bar { gap:16px; }
  .timeline { padding-left:28px; }
  .timeline-item::before { left:-40px; }
}

/* ── 浮动客服 ─────────────────────────────────── */
.chat-widget { position:fixed; top:38.2%; right:24px; z-index:999; transform:translateY(-50%); }
.chat-widget-btn {
  width:64px; height:64px; border-radius:16px; border:none;
  background:linear-gradient(135deg, var(--accent), var(--accent2));
  color:#fff; font-size:22px; cursor:pointer;
  box-shadow:0 4px 24px var(--accent-glow);
  transition:var(--transition); display:flex; flex-direction:column; align-items:center; justify-content:center;
  font-weight:600; line-height:1.1;
}
.chat-widget-btn .chat-label { font-size:10px; font-weight:500; opacity:0.9; }
.chat-widget-btn:hover { transform:scale(1.05); box-shadow:0 6px 32px var(--accent-glow); }

.chat-panel {
  display:none; flex-direction:column;
  position:fixed; top:38.2%; right:100px; z-index:998;
  transform:translateY(-50%);
  width:380px; height:520px; max-height:calc(100vh - 80px);
  background:#f0f2f5; border-radius:14px; overflow:hidden;
  box-shadow:0 8px 48px rgba(0,0,0,0.35);
}
.chat-panel.open { display:flex; }
.chat-panel-head {
  background:linear-gradient(135deg, var(--accent), var(--accent2));
  color:#fff; padding:10px 16px; font-size:14px; font-weight:600;
  display:flex; justify-content:space-between; align-items:center;
  flex-shrink:0;
}
.chat-panel-head button { background:none; border:none; color:#fff; font-size:22px; cursor:pointer; line-height:1; }
.chat-panel-msgs {
  flex:1; overflow-y:auto; padding:12px 14px;
  display:flex; flex-direction:column; gap:8px;
}
.chat-msg { display:flex; max-width:88%; animation:fadeIn .25s; }
@keyframes fadeIn { from{opacity:0;transform:translateY(4px)} to{opacity:1;transform:translateY(0)} }
.chat-msg.bot { align-self:flex-start; }
.chat-msg.user { align-self:flex-end; }
.chat-msg .bubble {
  padding:9px 13px; border-radius:14px; font-size:13px; line-height:1.5; word-break:break-word;
}
.chat-msg.bot .bubble { background:#fff; color:#333; border-bottom-left-radius:4px; }
.chat-msg.user .bubble { background:var(--accent); color:#fff; border-bottom-right-radius:4px; }
.chat-panel-typing {
  padding:6px 16px; font-size:12px; color:#999; display:none; flex-shrink:0;
}
.chat-panel-input {
  padding:10px 14px; background:#fff; border-top:1px solid #e8e8e8;
  display:flex; gap:8px; flex-shrink:0;
}
.chat-panel-input input {
  flex:1; padding:9px 14px; border:1px solid #e0e0e0; border-radius:20px;
  font-size:13px; outline:none; font-family:inherit;
}
.chat-panel-input input:focus { border-color:var(--accent); }
.chat-panel-input button {
  padding:9px 18px; border:none; border-radius:20px;
  background:var(--accent); color:#fff; font-size:13px; font-weight:500;
  cursor:pointer; white-space:nowrap;
}
.chat-panel-input button:disabled { opacity:0.5; }

@media(max-width:480px) {
  .chat-panel { width:calc(100vw - 32px); right:16px; top:auto; bottom:16px; transform:none; height:460px; }
  .chat-widget { top:auto; bottom:16px; right:16px; transform:none; }
}