/* ============ Reset & Tokens ============ */
* { margin:0; padding:0; box-sizing:border-box; }
:root {
  --bg: #0a0b14;
  --bg-2: #0e0f1d;
  --surface: rgba(255,255,255,0.04);
  --surface-2: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.09);
  --border-strong: rgba(255,255,255,0.16);
  --text: #eef0f6;
  --text-2: #c0c3d2;
  --text-3: #8e92a6;
  --dev: #ef4444;
  --proto: #3b82f6;
  --brand-1: #6155F5;
  --brand-2: #0088FF;
  --grad: linear-gradient(135deg, #6155F5, #0088FF);
  --grad-text: linear-gradient(100deg, #8b7dff 0%, #2b9bff 100%);
  --font: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --mono: 'SF Mono', 'Fira Code', ui-monospace, Consolas, monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

html { scroll-behavior:smooth; }
body {
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.5;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
a { color:inherit; text-decoration:none; }

/* ============ 流动光晕背景 ============ */
.aurora { position:fixed; inset:0; z-index:-2; overflow:hidden; pointer-events:none; }
.blob { position:absolute; border-radius:50%; filter:blur(90px); opacity:0.55; will-change:transform; }
.blob-1 { width:620px; height:620px; background:radial-gradient(circle, #6155F5, transparent 68%); top:-160px; left:-120px; animation:float1 18s var(--ease) infinite alternate; }
.blob-2 { width:560px; height:560px; background:radial-gradient(circle, #0088FF, transparent 68%); top:8%; right:-160px; animation:float2 22s var(--ease) infinite alternate; }
.blob-3 { width:520px; height:520px; background:radial-gradient(circle, #a855f7, transparent 70%); bottom:-180px; left:30%; animation:float3 20s var(--ease) infinite alternate; }
@keyframes float1 { to { transform:translate(120px,80px) scale(1.15); } }
@keyframes float2 { to { transform:translate(-100px,120px) scale(1.1); } }
@keyframes float3 { to { transform:translate(80px,-90px) scale(1.2); } }

.grid-overlay {
  position:fixed; inset:0; z-index:-1; pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
  background-size:46px 46px;
  mask-image:radial-gradient(ellipse 100% 70% at 50% 30%, #000 40%, transparent 85%);
  -webkit-mask-image:radial-gradient(ellipse 100% 70% at 50% 30%, #000 40%, transparent 85%);
}

/* ============ 通用 ============ */
section { position:relative; }
.section-title {
  font-size:clamp(26px, 3.4vw, 40px); font-weight:800; text-align:center;
  letter-spacing:-0.5px; margin-bottom:48px; line-height:1.2;
}
.grad-text { background:var(--grad-text); -webkit-background-clip:text; background-clip:text; color:transparent; }

/* ============ 按钮 ============ */
.btn {
  display:inline-flex; align-items:center; gap:9px; justify-content:center;
  font-weight:600; border-radius:12px; cursor:pointer; border:none;
  font-family:inherit; transition:transform .25s var(--spring), box-shadow .3s var(--ease), background .25s var(--ease);
  position:relative; white-space:nowrap;
}
.btn-sm { padding:9px 16px; font-size:13.5px; }
.btn-lg { padding:14px 26px; font-size:15.5px; }
.btn-chrome {
  background:var(--grad); color:#fff;
  box-shadow:0 8px 24px -6px rgba(97,85,245,0.6), 0 0 0 1px rgba(255,255,255,0.08) inset;
}
.btn-chrome:hover { transform:translateY(-2px) scale(1.02); box-shadow:0 14px 36px -6px rgba(97,85,245,0.8), 0 0 30px rgba(0,136,255,0.4); }
.btn-chrome:active { transform:translateY(0) scale(0.99); }
.btn-ghost { background:var(--surface); color:var(--text); border:1px solid var(--border); backdrop-filter:blur(12px); }
.btn-ghost:hover { background:var(--surface-2); border-color:var(--border-strong); transform:translateY(-2px); }

/* ============ 导航栏 ============ */
.nav { position:fixed; top:0; left:0; right:0; z-index:100; transition:background .3s var(--ease), border-color .3s var(--ease), backdrop-filter .3s; border-bottom:1px solid transparent; }
.nav.scrolled { background:rgba(10,11,20,0.72); backdrop-filter:blur(20px) saturate(1.4); border-bottom-color:var(--border); }
.nav-inner { max-width:1180px; margin:0 auto; padding:14px 28px; display:flex; align-items:center; gap:24px; }
.brand { display:flex; align-items:center; gap:10px; font-weight:800; font-size:19px; }
.brand-logo { width:30px; height:30px; filter:drop-shadow(0 2px 8px rgba(97,85,245,0.5)); }
.brand-it { color:#2b9bff; }
.nav-links { display:flex; gap:28px; margin-left:auto; font-size:14.5px; color:var(--text-2); }
.nav-links a { position:relative; transition:color .2s; }
.nav-links a::after { content:''; position:absolute; left:0; bottom:-5px; width:0; height:2px; background:var(--grad); border-radius:2px; transition:width .25s var(--ease); }
.nav-links a:hover { color:var(--text); }
.nav-links a:hover::after { width:100%; }

/* ============ HERO ============ */
.hero {
  max-width:1180px; margin:0 auto; padding:70px 28px 80px;
  min-height:100vh; min-height:100dvh;
  display:grid; grid-template-columns:1fr 1.05fr; gap:54px; align-items:center;
}
.eyebrow {
  display:inline-flex; align-items:center; gap:8px; font-size:13px; font-weight:600;
  color:var(--text-2); background:var(--surface); border:1px solid var(--border);
  padding:6px 14px; border-radius:999px; margin-bottom:22px; backdrop-filter:blur(10px);
}
.dot-live { width:8px; height:8px; border-radius:50%; background:#34d399; box-shadow:0 0 0 0 rgba(52,211,153,0.6); animation:livePulse 1.8s infinite; }
@keyframes livePulse { 0%{box-shadow:0 0 0 0 rgba(52,211,153,0.5);} 70%{box-shadow:0 0 0 8px rgba(52,211,153,0);} 100%{box-shadow:0 0 0 0 rgba(52,211,153,0);} }
.hero-title { font-size:clamp(34px, 4.6vw, 56px); font-weight:800; letter-spacing:-1px; line-height:1.1; }
.hero-sub { margin-top:20px; font-size:clamp(15px,1.5vw,18px); color:var(--text-2); line-height:1.7; }
.hero-sub b { color:var(--text); font-weight:700; }
.hero-cta { margin-top:32px; display:flex; gap:14px; flex-wrap:wrap; }
.hero-trust { margin-top:24px; font-size:13.5px; color:var(--text-3); }
.hero-trust b { color:var(--text-2); }

/* ============ DEMO 浏览器 ============ */
.demo-wrap { position:relative; }
.demo-glow { position:absolute; inset:-30px; background:radial-gradient(ellipse at 60% 40%, rgba(97,85,245,0.3), transparent 60%); filter:blur(40px); z-index:-1; }
.browser {
  background:#16172a; border-radius:14px; overflow:hidden;
  box-shadow:0 30px 70px -15px rgba(0,0,0,0.7), 0 0 0 1px rgba(255,255,255,0.08);
}
.browser-bar { height:38px; background:#101126; display:flex; align-items:center; gap:7px; padding:0 14px; border-bottom:1px solid rgba(255,255,255,0.05); }
.tdot { width:11px; height:11px; border-radius:50%; }
.tdot.r{background:#ff5f57;}.tdot.y{background:#febc2e;}.tdot.g{background:#28c840;}
.browser-url { margin-left:8px; flex:1; max-width:280px; height:22px; background:rgba(255,255,255,0.06); border-radius:6px; display:flex; align-items:center; gap:6px; padding:0 10px; font-size:11px; color:var(--text-3); }
.browser-body { position:relative; height:430px; overflow:hidden; background:#f7f7fb; }

/* 模拟网页 */
.mock-page { padding:0; font-size:13px; color:#2a2a35; height:100%; }
.mp-nav { display:flex; align-items:center; justify-content:space-between; padding:14px 22px; border-bottom:1px solid #ececf2; background:#fff; }
.mp-logo { font-weight:800; font-size:16px; color:#1a1a2e; }
.mp-links { display:flex; gap:18px; font-size:12.5px; color:#888; }
.mp-cta { background:#3b82f6; color:#fff; border:none; padding:7px 16px; border-radius:8px; font-size:12.5px; font-weight:600; cursor:default; }
.mp-hero { text-align:center; padding:30px 22px 20px; }
.mp-hero h2 { font-size:26px; font-weight:800; color:#1a1a2e; line-height:1.2; }
.mp-hero p { margin:10px auto 16px; font-size:13px; color:#8a8a8a; max-width:300px; }
.mp-primary { background:#3b82f6; color:#fff; border:none; padding:10px 24px; border-radius:9px; font-size:13px; font-weight:600; cursor:default; }
.mp-cards { display:flex; gap:14px; padding:8px 22px 22px; }
.mp-card { flex:1; padding:16px; background:#f4f5fa; border:1px solid #eaecf3; border-radius:11px; }
.mp-ic { font-size:20px; margin-bottom:8px; }
.mp-card h3 { font-size:13px; color:#1a1a2e; margin-bottom:4px; }
.mp-card p { font-size:11px; color:#999; line-height:1.45; }

/* 可点击元素的 hover 提示（标注模式下） */
.browser.annotating .mock-page [data-el]:hover { cursor:crosshair; outline:2px dashed rgba(99,85,245,0.5); outline-offset:2px; border-radius:4px; }
.browser.annotating.mode-proto .mock-page [data-el]:hover { outline-color:rgba(59,130,246,0.6); }

/* 标注层 */
.anno-layer { position:absolute; inset:0; pointer-events:none; z-index:20; }
.anno-hl {
  position:absolute; border:2px solid var(--dev); background:rgba(239,68,68,0.1);
  border-radius:5px; animation:hlIn .35s cubic-bezier(0.34,1.56,0.64,1);
}
.anno-hl.proto {
  border:2px dashed var(--proto); background:rgba(59,130,246,0.06);
  border-radius:10px;
}
@keyframes hlIn { from{opacity:0; transform:scale(0.92);} to{opacity:1; transform:scale(1);} }
.anno-pin {
  position:absolute; width:26px; height:26px; border-radius:50%; color:#fff;
  font-weight:700; font-size:12px; display:flex; align-items:center; justify-content:center;
  border:2px solid #fff; transform:translate(-50%,-50%); z-index:25;
  cursor:pointer; pointer-events:auto;
  animation:pinDrop .45s cubic-bezier(0.34,1.56,0.64,1);
  transition:transform .25s cubic-bezier(0.34,1.56,0.64,1);
}
.anno-pin:hover { transform:translate(-50%,-50%) scale(1.15); }
.anno-pin.dev { background:var(--dev); box-shadow:0 4px 12px rgba(239,68,68,0.55); }
.anno-pin.proto { background:var(--proto); box-shadow:0 4px 12px rgba(59,130,246,0.55); }
.anno-pin-pulse { position:absolute; inset:0; border-radius:50%; background:inherit; animation:pinPing 1.5s cubic-bezier(0,0,0.2,1) infinite; opacity:0.6; z-index:-1; }
@keyframes pinDrop { from{opacity:0; transform:translate(-50%,-50%) scale(0) translateY(-8px);} to{opacity:1; transform:translate(-50%,-50%) scale(1);} }
@keyframes pinPing { 0%{transform:scale(1); opacity:.6;} 75%,100%{transform:scale(2); opacity:0;} }

/* 原型模式标签卡片 — 匹配产品毛玻璃风格 */
.anno-label {
  position:absolute; color:#fff; padding:14px 16px;
  border-radius:12px; min-width:220px; max-width:280px;
  background:rgba(18,18,22,0.92);
  box-shadow:0 16px 44px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.08), inset 0 1px 0 rgba(255,255,255,0.05);
  border-left:4px solid var(--proto);
  backdrop-filter:blur(16px) saturate(1.2);
  -webkit-backdrop-filter:blur(16px) saturate(1.2);
  pointer-events:auto; z-index:26;
  animation:labelIn .4s cubic-bezier(0.34,1.56,0.64,1);
  font-family:var(--font);
}
@keyframes labelIn { from{opacity:0; transform:translateX(-12px) scale(0.95);} to{opacity:1; transform:translateX(0) scale(1);} }
.anno-label-title { font-weight:700; font-size:13.5px; color:#eeeef0; }
.anno-label-desc { font-size:12px; color:#b0b0b8; margin-top:5px; line-height:1.55; }
.anno-label-close {
  position:absolute; top:8px; right:8px; width:20px; height:20px;
  border-radius:50%; border:1px solid rgba(255,255,255,0.1);
  background:rgba(255,255,255,0.06); color:rgba(255,255,255,0.5);
  display:flex; align-items:center; justify-content:center;
  cursor:pointer; font-size:11px; opacity:0;
  transition:all .2s;
}
.anno-label:hover .anno-label-close { opacity:1; }
.anno-label-close:hover { background:rgba(255,255,255,0.12); color:#fff; }

/* SVG 贝塞尔连线 */
.anno-lines { position:absolute; inset:0; pointer-events:none; z-index:24; overflow:visible; }

/* 拖拽框选 */
.anno-drag-box {
  position:absolute; pointer-events:none; z-index:21;
  border:2px dashed rgba(97,85,245,0.6); background:rgba(97,85,245,0.08);
  border-radius:6px; display:none;
}
.browser.mode-proto .anno-drag-box {
  border-color:rgba(59,130,246,0.6); background:rgba(59,130,246,0.08);
}

/* Pin 点击弹出详情 — 匹配产品 Popover 风格 */
.anno-popover {
  position:absolute; width:260px;
  background:rgba(18,18,22,0.94); border-radius:14px;
  box-shadow:0 20px 50px rgba(0,0,0,0.55), 0 0 0 1px rgba(255,255,255,0.1), inset 0 1px 0 rgba(255,255,255,0.05);
  backdrop-filter:blur(32px) saturate(1.4);
  -webkit-backdrop-filter:blur(32px) saturate(1.4);
  border:1px solid rgba(255,255,255,0.1);
  pointer-events:auto; z-index:28; overflow:hidden;
  font-family:var(--font);
  animation:popoverIn .35s cubic-bezier(0.34,1.56,0.64,1);
}
@keyframes popoverIn { from{opacity:0; transform:translateY(8px) scale(0.96);} to{opacity:1; transform:translateY(0) scale(1);} }
.anno-popover-head {
  padding:10px 14px; display:flex; align-items:center; justify-content:space-between;
  border-bottom:1px solid rgba(255,255,255,0.07);
}
.anno-popover-tag { display:flex; align-items:center; gap:7px; font-size:12.5px; color:#c8c8d0; font-weight:600; }
.anno-popover-tag .idx { width:20px; height:20px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:10px; font-weight:700; color:#fff; border:1.5px solid #fff; }
.anno-popover-tag .idx.dev { background:var(--dev); }
.anno-popover-tag .idx.proto { background:var(--proto); }
.anno-popover-close {
  width:22px; height:22px; border-radius:6px; border:1px solid rgba(255,255,255,0.08);
  background:rgba(255,255,255,0.04); color:rgba(255,255,255,0.4);
  display:flex; align-items:center; justify-content:center; cursor:pointer;
  font-size:13px; transition:all .15s;
}
.anno-popover-close:hover { background:rgba(255,255,255,0.1); color:#fff; }
.anno-popover-body { padding:10px 14px; font-size:12px; color:#b4b7c6; line-height:1.65; }
.anno-popover-body .field { display:flex; gap:6px; margin-bottom:5px; }
.anno-popover-body .field-label { color:var(--text-3); font-weight:600; min-width:50px; }
.anno-popover-body .field-value { color:var(--text-2); font-family:var(--mono); font-size:11px; }
.anno-popover-body .feedback-text { color:#e8e8ee; margin-top:6px; padding-top:6px; border-top:1px solid rgba(255,255,255,0.06); font-size:12.5px; }
.anno-popover-foot {
  padding:8px 14px; display:flex; align-items:center; justify-content:flex-end; gap:6px;
  border-top:1px solid rgba(255,255,255,0.07);
}
.anno-popover-btn {
  padding:5px 11px; font-size:11.5px; font-weight:600; border:none;
  border-radius:7px; cursor:pointer; display:flex; align-items:center; gap:4px;
  transition:all .15s; font-family:inherit;
}
.anno-popover-btn.copy { background:rgba(255,255,255,0.06); color:var(--text-2); border:1px solid rgba(255,255,255,0.08); }
.anno-popover-btn.copy:hover { background:rgba(255,255,255,0.1); color:var(--text); }
.anno-popover-btn.copy.done { background:#22c55e; color:#06210f; border-color:transparent; }
.anno-popover-btn.del { background:rgba(239,68,68,0.1); color:#f87171; border:1px solid rgba(239,68,68,0.15); }
.anno-popover-btn.del:hover { background:rgba(239,68,68,0.2); }

/* 工具栏 — 匹配产品毛玻璃风格 */
.mk-toolbar {
  position:absolute; right:18px; bottom:18px; z-index:30;
  background:rgba(18,18,22,0.82); border-radius:999px; padding:4px;
  display:flex; flex-direction:column; align-items:center; gap:3px;
  box-shadow:0 14px 44px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.12), inset 0 1px 0 rgba(255,255,255,0.05);
  backdrop-filter:blur(32px) saturate(1.4);
  -webkit-backdrop-filter:blur(32px) saturate(1.4);
  border:1px solid rgba(255,255,255,0.12);
}
.mk-modes { background:rgba(255,255,255,0.05); border-radius:999px; padding:3px; display:flex; flex-direction:column; gap:3px; border:1px solid rgba(255,255,255,0.08); }
.mk-mode { width:32px; height:32px; border-radius:50%; border:none; background:transparent; color:rgba(255,255,255,0.4); display:flex; align-items:center; justify-content:center; cursor:pointer; transition:all .25s cubic-bezier(0.34,1.56,0.64,1); }
.mk-mode:hover { background:rgba(255,255,255,0.08); }
.mk-mode.active[data-mode="dev"] { background:var(--dev); color:#fff; box-shadow:0 3px 10px rgba(239,68,68,0.5); }
.mk-mode.active[data-mode="proto"] { background:var(--proto); color:#fff; box-shadow:0 3px 10px rgba(59,130,246,0.5); }
.mk-mode-tooltip {
  position:absolute; right:calc(100% + 8px); top:50%; transform:translateY(-50%);
  background:rgba(18,18,22,0.95); color:#eef0f6; font-size:11px; font-weight:600;
  padding:5px 10px; border-radius:6px; white-space:nowrap; pointer-events:none;
  opacity:0; transition:opacity 0.2s, transform 0.2s cubic-bezier(0.34,1.56,0.64,1);
  box-shadow:0 4px 12px rgba(0,0,0,0.4); border:1px solid rgba(255,255,255,0.1);
  transform:translateY(-50%) translateX(4px);
}
.mk-mode:hover .mk-mode-tooltip { opacity:1; transform:translateY(-50%) translateX(0); }
.mk-sep { width:22px; height:1px; background:rgba(255,255,255,0.08); margin:1px 0; }
.mk-tool { width:32px; height:32px; border-radius:50%; border:none; background:transparent; color:rgba(255,255,255,0.5); display:flex; align-items:center; justify-content:center; cursor:pointer; transition:all .2s; }
.mk-tool:hover { background:rgba(255,255,255,0.08); color:#f87171; }
.mk-tool.hidden-state { color:rgba(255,255,255,0.25); }
.mk-tool.confirm { color:#f87171; background:rgba(239,68,68,0.15); animation:confirmPulse 0.6s ease; }
@keyframes confirmPulse { 0%,100%{transform:scale(1);} 50%{transform:scale(1.15);} }
.mk-trigger {
  width:40px; height:40px; border-radius:50%; background:var(--dev); display:flex; align-items:center; justify-content:center;
  box-shadow:0 8px 20px rgba(239,68,68,0.5), inset 0 1px 0 rgba(255,255,255,0.1);
  border:3px solid rgba(255,255,255,0.2); color:#fff;
  transition:background .3s var(--ease), transform .3s cubic-bezier(0.34,1.56,0.64,1), box-shadow .3s var(--ease);
}
.mk-trigger:hover { transform:scale(1.08); }
.mk-trigger.active { box-shadow:0 8px 20px rgba(239,68,68,0.5), inset 0 1px 0 rgba(255,255,255,0.1), 0 0 0 3px rgba(239,68,68,0.25); }
.mk-toolbar.mode-proto .mk-trigger { background:var(--proto); box-shadow:0 8px 20px rgba(59,130,246,0.5), inset 0 1px 0 rgba(255,255,255,0.1); }
.mk-toolbar.mode-proto .mk-trigger.active { box-shadow:0 8px 20px rgba(59,130,246,0.5), inset 0 1px 0 rgba(255,255,255,0.1), 0 0 0 3px rgba(59,130,246,0.25); }

/* 快捷键提示 */
.demo-shortcut-hint {
  text-align:center; margin-top:16px; font-size:12px; color:var(--text-3);
  display:flex; align-items:center; justify-content:center; gap:4px;
}
.demo-shortcut-hint kbd {
  display:inline-flex; align-items:center; justify-content:center;
  min-width:22px; height:22px; padding:0 5px;
  background:rgba(255,255,255,0.06); border:1px solid rgba(255,255,255,0.1);
  border-radius:5px; font-family:var(--mono); font-size:11px; color:var(--text-2);
  box-shadow:0 1px 2px rgba(0,0,0,0.2);
}
.demo-shortcut-hint span { margin-left:4px; }

/* 输出面板 — 匹配产品毛玻璃风格 */
.output-panel {
  margin-top:18px; background:rgba(18,18,22,0.94); border-radius:14px;
  border:1px solid rgba(255,255,255,0.1); overflow:hidden;
  box-shadow:0 16px 40px -10px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.04);
  backdrop-filter:blur(32px) saturate(1.4);
  -webkit-backdrop-filter:blur(32px) saturate(1.4);
}
.op-head { display:flex; align-items:center; justify-content:space-between; padding:11px 16px; border-bottom:1px solid rgba(255,255,255,0.07); }
.op-title { font-size:12.5px; color:var(--text-2); font-weight:600; display:flex; align-items:center; gap:7px; }
.op-actions { display:flex; align-items:center; gap:8px; }
.op-detail-group { display:flex; gap:2px; background:rgba(255,255,255,0.04); border-radius:6px; padding:2px; border:1px solid rgba(255,255,255,0.06); }
.op-detail-btn { padding:3px 9px; border-radius:4px; border:none; font-size:11px; font-weight:600; cursor:pointer; transition:all .15s; font-family:inherit; background:transparent; color:rgba(255,255,255,0.35); }
.op-detail-btn:hover { color:rgba(255,255,255,0.6); }
.op-detail-btn.active { background:rgba(255,255,255,0.1); color:#eef0f6; }
.op-copy { display:flex; align-items:center; gap:5px; font-size:12px; font-weight:600; padding:5px 12px; border-radius:7px; border:1px solid rgba(255,255,255,0.08); background:rgba(255,255,255,0.04); color:var(--text-2); cursor:pointer; transition:all .2s; font-family:inherit; }
.op-copy:hover { background:rgba(255,255,255,0.08); color:var(--text); }
.op-copy.done { background:#22c55e; color:#06210f; border-color:transparent; }
.op-body { padding:14px 16px; font-family:var(--mono); font-size:11.5px; line-height:1.75; color:#9a9aa8; white-space:pre-wrap; word-break:break-word; min-height:96px; max-height:200px; overflow-y:auto; }
.op-body .k { color:#60a5fa; font-weight:600; }
.op-body .h { color:#a78bfa; font-weight:700; }
.op-body .c { color:#34d399; }
.op-body .n { color:#fbbf24; }
.op-hint { padding:0 16px 14px; font-size:12px; color:var(--text-3); }
.op-hint.hidden { display:none; }

/* ============ 痛点 ============ */
.pain { max-width:900px; margin:0 auto; padding:90px 28px; text-align:center; }
.pain-quote {
  font-size:clamp(20px,2.6vw,30px); font-weight:700; line-height:1.5; color:var(--text);
  position:relative; padding:0 20px;
}
.q-mark { color:var(--brand-1); font-size:1.4em; font-weight:800; opacity:0.7; }
.pain-sub { margin-top:18px; color:var(--text-2); font-size:15px; }
.pain-grid { margin-top:44px; display:grid; grid-template-columns:1fr 1fr; gap:20px; }
.pain-card { background:var(--surface); border:1px solid var(--border); border-radius:16px; padding:28px; text-align:left; backdrop-filter:blur(12px); transition:transform .3s var(--ease), border-color .3s; }
.pain-card:hover { transform:translateY(-4px); border-color:var(--border-strong); }
.pain-ic { font-size:30px; margin-bottom:14px; }
.pain-card h3 { font-size:18px; margin-bottom:8px; }
.pain-card p { color:var(--text-2); font-size:14.5px; line-height:1.6; }

/* ============ 工作流 ============ */
.how { max-width:1100px; margin:0 auto; padding:80px 28px; }
.steps { display:flex; align-items:stretch; gap:18px; justify-content:center; }
.step { flex:1; background:var(--surface); border:1px solid var(--border); border-radius:18px; padding:30px 26px; backdrop-filter:blur(12px); transition:transform .3s var(--ease), border-color .3s, box-shadow .3s; }
.step:hover { transform:translateY(-6px); border-color:var(--border-strong); box-shadow:0 20px 50px -16px rgba(97,85,245,0.4); }
.step-num { font-size:34px; font-weight:800; background:var(--grad-text); -webkit-background-clip:text; background-clip:text; color:transparent; letter-spacing:-1px; }
.step h3 { font-size:19px; margin:12px 0 8px; }
.step p { color:var(--text-2); font-size:14px; line-height:1.6; }
.step-arrow { display:flex; align-items:center; font-size:26px; color:var(--text-3); }

/* ============ 两种模式 ============ */
.modes { max-width:1100px; margin:0 auto; padding:80px 28px; }
.mode-cards { display:grid; grid-template-columns:1fr 1fr; gap:24px; }
.mode-card { position:relative; border-radius:20px; padding:34px; overflow:hidden; border:1px solid var(--border); background:var(--surface); backdrop-filter:blur(12px); transition:transform .3s var(--ease), box-shadow .3s; }
.mode-card::before { content:''; position:absolute; inset:0; opacity:0.08; transition:opacity .3s; }
.mode-card.dev::before { background:radial-gradient(circle at 80% 0%, var(--dev), transparent 60%); }
.mode-card.proto::before { background:radial-gradient(circle at 80% 0%, var(--proto), transparent 60%); }
.mode-card:hover { transform:translateY(-6px); }
.mode-card.dev:hover { box-shadow:0 24px 60px -18px rgba(239,68,68,0.5); }
.mode-card.proto:hover { box-shadow:0 24px 60px -18px rgba(59,130,246,0.5); }
.mode-tag { display:inline-block; font-size:12.5px; font-weight:700; padding:5px 13px; border-radius:999px; margin-bottom:16px; }
.mode-card.dev .mode-tag { background:rgba(239,68,68,0.16); color:#ff8585; }
.mode-card.proto .mode-tag { background:rgba(59,130,246,0.16); color:#7cb0ff; }
.mode-card h3 { font-size:22px; margin-bottom:12px; position:relative; }
.mode-card > p { color:var(--text-2); font-size:14.5px; line-height:1.65; position:relative; }
.mode-list { list-style:none; margin-top:18px; display:flex; flex-direction:column; gap:9px; position:relative; }
.mode-list li { font-size:14px; color:var(--text-2); padding-left:24px; position:relative; }
.mode-list li::before { content:'✓'; position:absolute; left:0; font-weight:700; }
.mode-card.dev .mode-list li::before { color:var(--dev); }
.mode-card.proto .mode-list li::before { color:var(--proto); }

/* ============ 特性 ============ */
.features { max-width:1100px; margin:0 auto; padding:80px 28px; }
.feat-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:18px; }
.feat { background:var(--surface); border:1px solid var(--border); border-radius:16px; padding:26px; backdrop-filter:blur(12px); transition:transform .3s var(--ease), border-color .3s, background .3s; }
.feat:hover { transform:translateY(-5px); border-color:var(--border-strong); background:var(--surface-2); }
.feat-ic { font-size:26px; margin-bottom:12px; }
.feat h3 { font-size:16px; margin-bottom:7px; }
.feat p { color:var(--text-2); font-size:13.5px; line-height:1.55; }

/* ============ 下载 CTA ============ */
.download { max-width:1100px; margin:0 auto; padding:90px 28px 110px; }
.dl-card { position:relative; text-align:center; border-radius:28px; padding:60px 40px; overflow:hidden; border:1px solid var(--border-strong); background:linear-gradient(160deg, rgba(97,85,245,0.12), rgba(0,136,255,0.06)); }
.dl-glow { position:absolute; top:-40%; left:50%; transform:translateX(-50%); width:600px; height:400px; background:radial-gradient(ellipse, rgba(97,85,245,0.35), transparent 65%); filter:blur(50px); pointer-events:none; }
.dl-logo { width:72px; height:72px; position:relative; filter:drop-shadow(0 8px 26px rgba(97,85,245,0.6)); margin-bottom:22px; }
.dl-card h2 { font-size:clamp(26px,3.2vw,38px); font-weight:800; letter-spacing:-0.5px; position:relative; }
.dl-card > p { margin:14px 0 30px; color:var(--text-2); font-size:16px; position:relative; }
.dl-meta { margin-top:18px; font-size:13px; color:var(--text-3); position:relative; }

/* ============ 页脚 ============ */
.footer { max-width:1100px; margin:0 auto; padding:50px 28px 60px; text-align:center; border-top:1px solid var(--border); }
.footer .brand { justify-content:center; margin-bottom:14px; }
.footer .brand-logo { width:26px; height:26px; }
.footer-tagline { color:var(--text-2); font-size:14px; }
.footer-copy { margin-top:8px; color:var(--text-3); font-size:12.5px; }

/* ============ 滚动揭示 ============ */
.reveal { opacity:0; transform:translateY(26px); transition:opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity:1; transform:none; }

/* ============ 响应式 ============ */
@media (max-width:900px) {
  .hero { grid-template-columns:1fr; padding-top:80px; gap:40px; min-height:auto; }
  .nav-links { display:none; }
  .pain-grid, .mode-cards { grid-template-columns:1fr; }
  .feat-grid { grid-template-columns:1fr 1fr; }
  .steps { flex-direction:column; }
  .step-arrow { transform:rotate(90deg); justify-content:center; }
}
@media (max-width:560px) {
  .feat-grid { grid-template-columns:1fr; }
  .browser-body { height:360px; }
}
@media (prefers-reduced-motion: reduce) {
  .blob { animation:none; }
  .reveal { opacity:1; transform:none; }
}