:root {
  --bg-dark: #0b1120;
  --bg-slate: #0f172a;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #475569;
  --emerald: #059669;
  --emerald-bright: #10b981;
  --blue: #2563eb;
  --indigo: #4f46e5;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--surface-alt);
  color: var(--text);
  line-height: 1.6;
}

body[data-lang="en"] [data-lang-only="zh"] {
  display: none !important;
}

body[data-lang="zh"] [data-lang-only="en"] {
  display: none !important;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Navbar */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: #f8fafc;
}

.nav-inner {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 11px;
  color: #ffffff;
  text-decoration: none;
  font-weight: 800;
  font-size: 16px;
}

.nav-brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.nav-links a {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 600;
}

.nav-links a:hover {
  color: #ffffff;
}

.lang-switch {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  border-radius: 999px;
  padding: 5px 13px;
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
}

.lang-switch:hover {
  background: rgba(255, 255, 255, 0.16);
}

/* Hero Section */
.hero {
  background: radial-gradient(circle at 20% 15%, #065f46 0%, #0f172a 58%, #090d16 100%);
  color: #f8fafc;
  padding: 68px 0 76px;
}

.hero-badges {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.pill {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(16, 185, 129, 0.18);
  border: 1px solid rgba(52, 211, 153, 0.45);
  color: #6ee7b7;
}

.pill.indigo {
  background: rgba(79, 70, 229, 0.24);
  border-color: rgba(129, 140, 248, 0.5);
  color: #c7d2fe;
}

.hero h1 {
  font-size: clamp(32px, 4.5vw, 50px);
  font-weight: 900;
  letter-spacing: -0.025em;
  line-height: 1.14;
  margin: 0 0 16px;
  max-width: 860px;
}

.hero-lead {
  font-size: 18px;
  color: #cbd5e1;
  max-width: 760px;
  margin: 0 0 28px;
}

.store-badges {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}

.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 700;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.store-badge:hover {
  transform: translateY(-2px);
}

.store-edge {
  background: #ffffff;
  color: #0f172a;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
}

.store-firefox {
  background: linear-gradient(135deg, #ff7139 0%, #e22850 100%);
  color: #ffffff;
  box-shadow: 0 12px 28px rgba(226, 40, 80, 0.28);
}

.store-pro {
  background: rgba(16, 185, 129, 0.18);
  border: 1.5px solid #34d399;
  color: #ecfdf5;
}

.badge-small {
  display: block;
  font-size: 10.5px;
  font-weight: 700;
  opacity: 0.8;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-main {
  display: block;
  font-size: 15px;
  font-weight: 800;
}

.hero-trust {
  margin-top: 20px;
  font-size: 13px;
  color: #94a3b8;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

/* Interactive Before vs After Playground */
.section {
  padding: 68px 0;
}

.section-alt {
  background: #ffffff;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 34px;
}

.section-header h2 {
  font-size: 31px;
  font-weight: 850;
  margin: 0 0 10px;
  letter-spacing: -0.02em;
}

.section-header p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.playground-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  background: #0f172a;
  color: #f8fafc;
  padding: 12px 18px;
  border-radius: 14px 14px 0 0;
}

.pg-pills {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.pg-btn {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
  color: #e2e8f0;
  border-radius: 999px;
  padding: 6px 13px;
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
}

.pg-btn.active {
  background: var(--emerald-bright);
  border-color: var(--emerald-bright);
  color: #042f2e;
}

.slider-control-inline {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12.5px;
  font-weight: 700;
  color: #93c5fd;
}

.slider-control-inline input[type="range"] {
  width: 150px;
  accent-color: #34d399;
}

/* Split Comparison Viewport */
.compare-stage {
  position: relative;
  height: 470px;
  border: 2px solid #0f172a;
  border-top: none;
  border-radius: 0 0 16px 16px;
  overflow: hidden;
  background: #ffffff;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.12);
}

.compare-layer {
  position: absolute;
  inset: 0;
  padding: 28px 34px;
  overflow: hidden;
}

/* Base Layer: AFTER (CleanPrint Vector Output) */
.layer-after {
  background: #ffffff;
  color: #0f172a;
}

.layer-after.theme-serif {
  font-family: Georgia, "Iowan Old Style", "Times New Roman", serif;
}

.layer-after.theme-swiss {
  font-family: "Helvetica Neue", Helvetica, Inter, Arial, sans-serif;
}

.layer-after.theme-twocol .demo-body-cols {
  column-count: 2;
  column-gap: 28px;
  column-rule: 1px solid #cbd5e1;
}

.after-badge {
  display: inline-block;
  background: #ecfdf5;
  color: #047857;
  border: 1px solid #a7f3d0;
  font-size: 11px;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}

.demo-doc-title {
  font-size: 22px;
  font-weight: 850;
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1.5px solid #cbd5e1;
}

.demo-qa {
  border: 1px solid #cbd5e1;
  border-left: 4px solid #2563eb;
  background: #f8fafc;
  padding: 10px 14px;
  border-radius: 8px;
  margin-bottom: 12px;
  font-size: 13.5px;
}

.demo-qa.ai {
  border-left-color: #059669;
  background: #ffffff;
}

.demo-code {
  border: 1.5px solid #334155;
  border-radius: 8px;
  padding: 10px 14px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.2px;
  background: #1e293b;
  color: #f8fafc;
  margin-top: 8px;
  white-space: pre-wrap;
}

.layer-after.low-ink .demo-qa,
.layer-after.low-ink .demo-code {
  background: #ffffff !important;
  color: #0f172a !important;
}

/* Clipped Top Layer: BEFORE (Raw Messy Dark Chat & Web Clutter) */
.layer-before {
  background: #18181b;
  color: #e4e4e7;
  width: 100%;
  clip-path: inset(0 54% 0 0);
}

.before-badge {
  display: inline-block;
  background: #991b1b;
  color: #fee2e2;
  font-size: 11px;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}

.messy-bar {
  background: #27272a;
  padding: 9px 14px;
  border-radius: 8px;
  font-size: 12px;
  color: #a1a1aa;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
}

.messy-ad-banner {
  background: linear-gradient(90deg, #7c2d12, #b45309);
  color: #fef3c7;
  padding: 13px;
  border-radius: 8px;
  text-align: center;
  font-weight: 800;
  font-size: 12.5px;
  margin-bottom: 12px;
}

.messy-chat-dark {
  background: #09090b;
  border: 1px solid #3f3f46;
  border-radius: 8px;
  padding: 14px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  color: #a1a1aa;
  margin-bottom: 12px;
  white-space: nowrap;
  overflow: hidden;
  border-right: 5px dashed #ef4444;
}

.messy-cookie-modal {
  background: #27272a;
  border: 2px solid #f59e0b;
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 12.5px;
  font-weight: 700;
  color: #fef3c7;
}

.split-divider {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 46%;
  width: 3px;
  background: #10b981;
  pointer-events: none;
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.4);
}

.split-knob {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #10b981;
  color: #042f2e;
  font-weight: 900;
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 2px solid #ffffff;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
  white-space: nowrap;
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.feat-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 24px;
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.03);
}

.feat-icon {
  font-size: 24px;
  margin-bottom: 8px;
}

.feat-card h3 {
  font-size: 17.5px;
  margin: 0 0 6px;
}

.feat-card p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

/* Pricing / Pro Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  align-items: stretch;
}

.price-card {
  background: #ffffff;
  border: 1.5px solid var(--border);
  border-radius: 18px;
  padding: 28px;
  display: flex;
  flex-direction: column;
}

.price-card.featured {
  border: 2.5px solid var(--emerald);
  box-shadow: 0 18px 42px rgba(5, 150, 105, 0.12);
  position: relative;
}

.price-tag {
  font-size: 36px;
  font-weight: 900;
  margin: 8px 0 4px;
}

.price-note {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 16px;
}

.check-list {
  list-style: none;
  padding: 0;
  margin: 0 0 22px;
  flex: 1;
}

.check-list li {
  padding: 6px 0;
  font-size: 14px;
  border-bottom: 1px solid #f1f5f9;
}

.cta-btn {
  display: inline-block;
  text-align: center;
  padding: 12px 18px;
  border-radius: 10px;
  font-weight: 800;
  font-size: 14.5px;
  text-decoration: none;
  cursor: pointer;
  border: none;
}

.cta-emerald {
  background: var(--emerald);
  color: #ffffff;
}

.cta-emerald:hover {
  background: #047857;
}

.cta-outline {
  background: #f1f5f9;
  color: var(--text);
}

.verifier-box {
  margin-top: 28px;
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  border-radius: 14px;
  padding: 20px 24px;
}

.verifier-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.verifier-row input {
  flex: 1;
  min-width: 240px;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #94a3b8;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13.5px;
  text-transform: uppercase;
}

.verify-result {
  margin-top: 8px;
  font-size: 13.5px;
  font-weight: 700;
}

.verify-result.ok {
  color: var(--emerald);
}

.verify-result.err {
  color: #dc2626;
}

/* Privacy Policy Section */
.privacy-box {
  background: #ffffff;
  border: 1.5px solid #cbd5e1;
  border-radius: 16px;
  padding: 30px 34px;
}

.perm-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

.perm-table th,
.perm-table td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
}

.perm-table th {
  background: #f8fafc;
  font-weight: 800;
}

.site-footer {
  background: var(--bg-dark);
  color: #94a3b8;
  padding: 36px 0;
  font-size: 13.5px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-inner a {
  color: #cbd5e1;
  text-decoration: none;
}

.footer-inner a:hover {
  color: #ffffff;
}

@media (max-width: 720px) {
  .compare-stage {
    height: 530px;
  }
}