/* ============================================================
   千目 · 统一智能运维监控平台 — 产品官网
   深色科技风 · 无构建依赖
   ============================================================ */

:root {
  --bg: #0a0f1c;
  --bg-2: #0d1424;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-strong: rgba(255, 255, 255, 0.07);
  --line: rgba(148, 163, 184, 0.16);
  --line-strong: rgba(148, 163, 184, 0.3);
  --text: #e8eef8;
  --text-2: #9fb0c7;
  --text-3: #64748b;
  --accent: #22d3ee;
  --accent-2: #3b82f6;
  --grad: linear-gradient(120deg, #22d3ee 0%, #3b82f6 55%, #8b5cf6 100%);
  --red: #f87171;
  --amber: #fbbf24;
  --green: #34d399;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow: 0 20px 60px rgba(2, 6, 23, 0.55);
  --max: 1180px;
  --font: "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: rgba(34, 211, 238, 0.35); }

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

/* ---------- 通用 ---------- */
.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.35em;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 14px;
}
.section-head { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.section-head h2 { font-size: clamp(26px, 4vw, 40px); font-weight: 700; line-height: 1.3; letter-spacing: 0.01em; }
.section-head p { color: var(--text-2); margin-top: 14px; font-size: 16px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px;
  font-size: 15px; font-weight: 600; cursor: pointer; border: none;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--grad); color: #04121f;
  box-shadow: 0 8px 28px rgba(34, 211, 238, 0.28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(34, 211, 238, 0.4); }
.btn-ghost {
  background: transparent; color: var(--text);
  border: 1px solid var(--line-strong);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn-sm { padding: 8px 18px; font-size: 13.5px; }
.btn-lg { padding: 15px 34px; font-size: 16.5px; }
.btn-block { width: 100%; }

/* ---------- 入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.delay-1 { transition-delay: 0.12s; }
.reveal.delay-2 { transition-delay: 0.24s; }
.reveal.delay-3 { transition-delay: 0.36s; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(10, 15, 28, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
.nav-inner {
  max-width: var(--max); margin: 0 auto; padding: 0 24px;
  height: 66px; display: flex; align-items: center; gap: 28px;
}
.brand { display: flex; align-items: baseline; gap: 9px; flex-shrink: 0; }
.brand-logo {
  width: 34px; height: 34px; border-radius: 9px;
  background: var(--grad);
  display: inline-flex; align-items: center; justify-content: center;
  align-self: center;
  box-shadow: 0 4px 16px rgba(34, 211, 238, 0.35);
}
.brand-logo svg { fill: #04121f; }
.brand-name { font-size: 20px; font-weight: 800; letter-spacing: 0.06em; }
.brand-sub { font-size: 12px; color: var(--text-3); letter-spacing: 0.08em; }
.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a {
  font-size: 14px; color: var(--text-2); font-weight: 500;
  transition: color 0.2s; position: relative; padding: 6px 0;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--grad); border-radius: 2px; transition: width 0.25s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }
.nav-cta { flex-shrink: 0; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; margin-left: auto; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; border-radius: 2px; transition: 0.3s; }

/* ---------- Hero ---------- */
.hero {
  position: relative; padding: 150px 0 90px;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.07) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 30%, transparent 75%);
}
.glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.5; }
.glow-a { width: 560px; height: 560px; top: -180px; left: -120px; background: radial-gradient(circle, rgba(59, 130, 246, 0.5), transparent 70%); }
.glow-b { width: 640px; height: 640px; top: -120px; right: -180px; background: radial-gradient(circle, rgba(34, 211, 238, 0.35), transparent 70%); }
.scanline {
  position: absolute; left: 0; right: 0; top: 0; height: 120px;
  background: linear-gradient(180deg, transparent, rgba(34, 211, 238, 0.05), transparent);
  animation: scan 9s linear infinite;
}
@keyframes scan { 0% { transform: translateY(-120px); } 100% { transform: translateY(110vh); } }

.hero-inner {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center;
  position: relative;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; color: var(--accent);
  border: 1px solid rgba(34, 211, 238, 0.35); border-radius: 999px;
  padding: 6px 14px; background: rgba(34, 211, 238, 0.07);
  margin-bottom: 22px; letter-spacing: 0.04em;
}
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--green); animation: pulse 2s infinite; }
@keyframes pulse { 50% { opacity: 0.4; } }
.hero h1 {
  font-size: clamp(34px, 5.2vw, 58px); font-weight: 800; line-height: 1.18;
  letter-spacing: 0.01em;
}
.hero-lead { margin-top: 22px; font-size: 16.5px; color: var(--text-2); max-width: 560px; }
.hero-lead b { color: var(--text); }
.hero-actions { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
.hero-actions.center { justify-content: center; }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, auto); gap: 8px 34px;
  margin-top: 44px; list-style: none;
}
.hero-stats b { font-size: 30px; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-stats b .unit { font-size: 17px; }
.hero-stats span { display: block; font-size: 12px; color: var(--text-3); line-height: 1.55; margin-top: 4px; }

.hero-visual { position: relative; }
.tilt { transform: perspective(1400px) rotateY(-7deg) rotateX(2deg); transition: transform 0.5s ease; }
.tilt:hover { transform: perspective(1400px) rotateY(-3deg) rotateX(1deg); }

/* 浏览器窗口框 */
.browser-frame {
  border: 1px solid var(--line-strong); border-radius: var(--radius-lg);
  overflow: hidden; background: var(--bg-2);
  box-shadow: var(--shadow);
}
.browser-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 10px 14px; background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid var(--line);
}
.browser-bar span { width: 10px; height: 10px; border-radius: 50%; background: rgba(148, 163, 184, 0.35); }
.browser-bar span:nth-child(1) { background: #f87171; }
.browser-bar span:nth-child(2) { background: #fbbf24; }
.browser-bar span:nth-child(3) { background: #34d399; }
.browser-bar em {
  font-style: normal; font-size: 12px; color: var(--text-3); margin-left: 10px;
  font-family: "SFMono-Regular", Consolas, monospace;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.browser-frame img { width: 100%; }

.float-card {
  position: absolute; display: flex; align-items: center; gap: 11px;
  background: rgba(13, 20, 36, 0.92); backdrop-filter: blur(10px);
  border: 1px solid var(--line-strong); border-radius: 12px;
  padding: 11px 16px; box-shadow: var(--shadow);
  animation: floaty 5s ease-in-out infinite;
}
.float-card b { display: block; font-size: 13px; }
.float-card em { font-style: normal; font-size: 11.5px; color: var(--text-3); }
.float-card-a { top: 14%; left: -9%; }
.float-card-b { bottom: 12%; right: -6%; animation-delay: 2.2s; }
.fc-icon {
  width: 30px; height: 30px; border-radius: 8px; flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 800;
}
.fc-red { background: rgba(248, 113, 113, 0.16); color: var(--red); border: 1px solid rgba(248, 113, 113, 0.4); }
.fc-blue { background: rgba(59, 130, 246, 0.16); color: #7db2ff; border: 1px solid rgba(59, 130, 246, 0.4); }
@keyframes floaty { 50% { transform: translateY(-9px); } }

/* ---------- 痛点 ---------- */
.pains { padding: 90px 0 40px; }
.pains-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.pain-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 22px; transition: transform 0.25s, border-color 0.25s, background 0.25s;
}
.pain-card:hover { transform: translateY(-5px); border-color: rgba(34, 211, 238, 0.4); background: var(--panel-strong); }
.pain-no { font-size: 13px; font-weight: 800; color: var(--accent); letter-spacing: 0.2em; margin-bottom: 12px; }
.pain-card h3 { font-size: 17px; margin-bottom: 9px; }
.pain-card p { font-size: 13.5px; color: var(--text-2); }

/* ---------- 核心能力 ---------- */
.features { padding: 90px 0; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 30px 26px; transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
  position: relative; overflow: hidden;
}
.feature-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--grad); opacity: 0; transition: opacity 0.3s;
}
.feature-card:hover { transform: translateY(-6px); border-color: rgba(34, 211, 238, 0.35); box-shadow: 0 18px 50px rgba(2, 6, 23, 0.5); }
.feature-card:hover::before { opacity: 1; }
.f-icon {
  width: 46px; height: 46px; border-radius: 12px; margin-bottom: 18px;
  background: rgba(34, 211, 238, 0.1); border: 1px solid rgba(34, 211, 238, 0.3);
  display: flex; align-items: center; justify-content: center;
}
.f-icon svg { width: 22px; height: 22px; fill: var(--accent); }
.f-icon svg .stroke { stroke: var(--accent); }
.feature-card h3 { font-size: 18px; margin-bottom: 10px; }
.feature-card p { font-size: 13.8px; color: var(--text-2); }

/* ---------- 产品界面 ---------- */
.screens { padding: 90px 0; background: linear-gradient(180deg, transparent, rgba(13, 20, 36, 0.7) 20%, rgba(13, 20, 36, 0.7) 80%, transparent); }
.shot-hero { display: grid; gap: 22px; margin-bottom: 26px; }
.shot-caption { text-align: center; max-width: 720px; margin: 0 auto 6px; }
.shot-caption h3 { font-size: 22px; margin-bottom: 10px; }
.shot-caption p { font-size: 14.5px; color: var(--text-2); }
.dark-frame { border-color: rgba(34, 211, 238, 0.35); box-shadow: 0 30px 90px rgba(2, 6, 23, 0.7), 0 0 0 1px rgba(34, 211, 238, 0.06); }
.shot-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.shot-grid figure { position: relative; }
.shot-grid figcaption {
  padding: 14px 18px; font-size: 13px; color: var(--text-2);
  border-top: 1px solid var(--line);
}
.shot-grid .browser-frame { transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s; cursor: zoom-in; }
.shot-grid .browser-frame:hover { transform: translateY(-5px); border-color: rgba(34, 211, 238, 0.45); box-shadow: 0 22px 60px rgba(2, 6, 23, 0.65); }

/* ---------- 功能深潜 ---------- */
.deep { padding: 90px 0; }
.deep-row { display: grid; grid-template-columns: 1fr 1.1fr; gap: 52px; align-items: center; margin-bottom: 90px; }
.deep-row:last-child { margin-bottom: 0; }
.deep-row.reverse { grid-template-columns: 1.1fr 1fr; }
.deep-row.reverse .deep-copy { order: 2; }
.deep-row.reverse figure { order: 1; }
.deep-step {
  font-size: 12px; letter-spacing: 0.3em; color: var(--accent); font-weight: 700;
}
.deep-copy h3 { font-size: 26px; margin: 12px 0 16px; }
.deep-copy p { color: var(--text-2); font-size: 15px; }
.check-list { list-style: none; margin-top: 22px; display: grid; gap: 12px; }
.check-list li {
  padding-left: 30px; position: relative; font-size: 14px; color: var(--text-2);
}
.check-list li::before {
  content: "✓"; position: absolute; left: 0; top: 1px;
  width: 20px; height: 20px; border-radius: 6px;
  background: rgba(52, 211, 153, 0.14); color: var(--green);
  font-size: 12px; display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(52, 211, 153, 0.35);
}

/* ---------- 技术架构 ---------- */
.tech { padding: 90px 0; background: linear-gradient(180deg, transparent, rgba(13, 20, 36, 0.7) 25%, rgba(13, 20, 36, 0.7) 75%, transparent); }
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.tech-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 22px; transition: border-color 0.25s, background 0.25s, transform 0.25s;
}
.tech-card:hover { border-color: rgba(139, 92, 246, 0.45); background: var(--panel-strong); transform: translateY(-4px); }
.tech-card h4 { font-size: 16px; margin-bottom: 9px; color: var(--text); }
.tech-card p { font-size: 13.2px; color: var(--text-2); }
.tech-stack {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 42px;
}
.tech-stack span {
  font-size: 13px; font-weight: 600; color: var(--text-2);
  border: 1px solid var(--line-strong); border-radius: 999px; padding: 8px 18px;
  background: var(--panel);
  font-family: "SFMono-Regular", Consolas, monospace;
}

/* ---------- 版本 ---------- */
.editions { padding: 90px 0; }
.edition-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.edition-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 34px 30px; display: flex; flex-direction: column;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
  position: relative;
}
.edition-card:hover { transform: translateY(-6px); }
.edition-hot {
  border-color: rgba(34, 211, 238, 0.5);
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.08), rgba(59, 130, 246, 0.04));
  box-shadow: 0 24px 70px rgba(2, 6, 23, 0.6);
}
.hot-badge {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: var(--grad); color: #04121f; font-size: 12px; font-weight: 700;
  padding: 4px 16px; border-radius: 999px; letter-spacing: 0.1em;
}
.edition-card h3 { font-size: 21px; }
.edition-tag { font-size: 13px; color: var(--text-3); margin-top: 4px; }
.edition-price { font-size: 34px; font-weight: 800; margin: 20px 0 4px; }
.edition-price span { display: block; font-size: 12.5px; font-weight: 500; color: var(--text-3); margin-top: 2px; }
.edition-card ul { list-style: none; margin: 22px 0 28px; display: grid; gap: 11px; flex: 1; }
.edition-card li { font-size: 13.8px; color: var(--text-2); padding-left: 24px; position: relative; }
.edition-card li::before {
  content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700;
}
.edition-note { text-align: center; margin-top: 30px; font-size: 13.5px; color: var(--text-3); }

/* ---------- 部署与安全 ---------- */
.deploy { padding: 90px 0; background: linear-gradient(180deg, transparent, rgba(13, 20, 36, 0.7) 25%, rgba(13, 20, 36, 0.7) 75%, transparent); }
.deploy-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.deploy-copy h2 { font-size: clamp(26px, 3.4vw, 36px); margin-bottom: 16px; }
.deploy-copy > p { color: var(--text-2); font-size: 15px; }
.deploy-steps { margin-top: 30px; display: grid; gap: 16px; }
.d-step { display: flex; gap: 15px; align-items: flex-start; }
.d-step b {
  width: 30px; height: 30px; border-radius: 9px; flex-shrink: 0;
  background: rgba(34, 211, 238, 0.12); border: 1px solid rgba(34, 211, 238, 0.4);
  color: var(--accent); font-size: 14px;
  display: inline-flex; align-items: center; justify-content: center;
}
.d-step em { font-style: normal; font-weight: 700; font-size: 14.5px; display: block; }
.d-step span { font-size: 13px; color: var(--text-3); }

.terminal {
  border: 1px solid var(--line-strong); border-radius: var(--radius-lg);
  overflow: hidden; background: #070b14; box-shadow: var(--shadow);
}
.terminal-bar { display: flex; align-items: center; gap: 7px; padding: 10px 14px; background: rgba(255, 255, 255, 0.04); border-bottom: 1px solid var(--line); }
.terminal-bar span { width: 10px; height: 10px; border-radius: 50%; background: rgba(148, 163, 184, 0.3); }
.terminal-bar span:nth-child(1) { background: #f87171; }
.terminal-bar span:nth-child(2) { background: #fbbf24; }
.terminal-bar span:nth-child(3) { background: #34d399; }
.terminal-bar em { font-style: normal; font-size: 12px; color: var(--text-3); margin-left: 10px; font-family: Consolas, monospace; }
.terminal pre {
  padding: 22px 24px; font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-size: 13.2px; line-height: 1.85; color: #c9d6ea; overflow-x: auto;
}
.c-cm { color: #5b6b84; }
.c-$ { color: var(--accent); font-weight: 700; }
.c-ok { color: var(--green); }
.sec-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.chip {
  font-size: 12.5px; color: var(--text-2); border: 1px solid var(--line-strong);
  border-radius: 999px; padding: 6px 14px; background: var(--panel);
}

/* ---------- CTA ---------- */
.cta { padding: 110px 0; position: relative; overflow: hidden; }
.cta::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 80% at 50% 100%, rgba(59, 130, 246, 0.18), transparent 70%);
  pointer-events: none;
}
.cta-inner { text-align: center; position: relative; }
.cta-grid {
  display: grid; grid-template-columns: 1fr auto; gap: 56px; align-items: center;
}
.cta-copy { text-align: left; }
.cta-copy .hero-actions { margin-top: 30px; }
.cta-copy .cta-mail { text-align: left; }
.cta h2 { font-size: clamp(30px, 4.5vw, 46px); font-weight: 800; }
.cta p { color: var(--text-2); margin-top: 16px; font-size: 16px; }
.cta .hero-actions { margin-top: 34px; }
.cta-mail { margin-top: 26px; font-size: 13.5px; color: var(--text-3); }
.cta-mail a { color: var(--accent); }

/* 演示账号提示 */
.cta .demo-cred {
  margin-top: 20px; font-size: 13px; color: var(--text-3);
  display: inline-flex; align-items: center; gap: 7px;
}
.cta .demo-cred code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px; color: var(--text-2);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line-strong);
  border-radius: 6px; padding: 3px 10px; letter-spacing: 0.3px;
}
.cta .demo-cred .cred-sep { opacity: 0.4; }

/* 微信二维码卡片 */
.qr-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(34, 211, 238, 0.4); border-radius: var(--radius-lg);
  padding: 26px 26px 22px; text-align: center;
  box-shadow: var(--shadow), 0 0 44px rgba(34, 211, 238, 0.18);
}
.qr-img {
  width: 190px; height: 190px; margin: 0 auto 16px;
  background: #fff; border-radius: 14px; padding: 10px;
}
.qr-card b { display: block; font-size: 15.5px; }
.qr-card em { display: block; font-style: normal; font-size: 12px; color: var(--text-3); margin-top: 7px; line-height: 1.6; max-width: 230px; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); padding: 34px 0; background: #070b14; }
.footer-inner { display: flex; align-items: center; gap: 26px; flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: 9px; font-size: 14px; color: var(--text-2); }
.footer-brand b { color: var(--text); }
.footer-brand .brand-logo { width: 28px; height: 28px; border-radius: 7px; }
.footer-links { display: flex; gap: 20px; margin-left: auto; }
.footer-links a { font-size: 13px; color: var(--text-3); transition: color 0.2s; }
.footer-links a:hover { color: var(--accent); }
.footer-copy { width: 100%; font-size: 12.5px; color: var(--text-3); margin-top: 4px; }

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(4, 8, 18, 0.92); backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity 0.25s;
  padding: 4vh 4vw;
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox img {
  max-width: 100%; max-height: 100%; border-radius: 10px;
  border: 1px solid var(--line-strong); box-shadow: var(--shadow);
}
.lb-close {
  position: absolute; top: 22px; right: 30px; z-index: 2;
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--panel-strong); border: 1px solid var(--line-strong);
  color: var(--text); font-size: 24px; cursor: pointer; line-height: 1;
  transition: border-color 0.2s, color 0.2s;
}
.lb-close:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 60px; }
  .hero-visual { max-width: 640px; margin: 0 auto; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 22px; }
  .pains-grid, .feature-grid, .tech-grid, .edition-grid { grid-template-columns: repeat(2, 1fr); }
  .deep-row, .deep-row.reverse { grid-template-columns: 1fr; gap: 30px; margin-bottom: 70px; }
  .deep-row.reverse .deep-copy { order: 1; }
  .deep-row.reverse figure { order: 2; }
  .deploy-grid { grid-template-columns: 1fr; gap: 44px; }
  .cta-grid { grid-template-columns: 1fr; }
  .cta-copy { text-align: center; }
  .cta-copy .hero-actions, .cta-copy .cta-mail { text-align: center; justify-content: center; }
  .nav-links { display: none; }
}
@media (max-width: 640px) {
  .pains-grid, .feature-grid, .tech-grid, .edition-grid, .shot-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 120px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .float-card { display: none; }
  .brand-sub { display: none; }
  .nav-toggle { display: block; }
  .nav-cta { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; gap: 4px;
    position: absolute; top: 66px; left: 0; right: 0;
    background: rgba(10, 15, 28, 0.97); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
    padding: 18px 24px 22px;
  }
  .nav-links.open a { padding: 10px 0; font-size: 15px; }
}