:root {
  --navy: #11243c;
  --navy-soft: #1c3654;
  --orange: #e8713b;
  --orange-dark: #bd4c23;
  --cream: #f8f4ec;
  --paper: #fffdf9;
  --ink: #1b2633;
  --muted: #6e7884;
  --line: #e5e0d7;
  --success: #2f725a;
  --danger: #b54534;
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --shadow: 0 20px 50px rgba(17, 36, 60, 0.1);
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--cream);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

button, input { font: inherit; }
button { cursor: pointer; }
img { display: block; max-width: 100%; }

.skip-link {
  position: absolute;
  z-index: 20;
  top: -5rem;
  left: 1rem;
  padding: 0.65rem 1rem;
  color: var(--paper);
  background: var(--navy);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}
.skip-link:focus { top: 0; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible { outline: 3px solid #f6aa70; outline-offset: 3px; }

.site-footer {
  max-width: 1180px;
  padding: 2rem 1.25rem 5rem;
  margin: 0 auto;
  color: var(--muted);
  font-size: 0.8rem;
}

.page-shell { max-width: 1180px; padding: 1rem 1.25rem 2rem; margin: 0 auto; }
.topbar { display: flex; align-items: center; justify-content: space-between; min-height: 3rem; }
.brand { display: inline-flex; gap: 0.6rem; align-items: center; color: var(--navy); font-weight: 800; text-decoration: none; letter-spacing: 0.03em; }
.brand-mark { display: grid; width: 2rem; height: 2rem; place-items: center; color: var(--paper); background: var(--orange); border-radius: 10px 10px 10px 3px; font-weight: 900; }
.topbar-note { color: var(--muted); font-size: 0.78rem; }

.hero {
  position: relative;
  display: grid;
  gap: var(--space-5);
  padding: 2rem 0 3rem;
  overflow: hidden;
}
.hero::after { position: absolute; right: -5rem; bottom: 0; width: 15rem; height: 15rem; content: ""; border: 1px solid rgba(232, 113, 59, 0.2); border-radius: 50%; box-shadow: 0 0 0 2rem rgba(232, 113, 59, 0.05), 0 0 0 4rem rgba(232, 113, 59, 0.03); pointer-events: none; }
.eyebrow { margin: 0 0 0.65rem; color: var(--orange-dark); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.16em; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 13ch; margin-bottom: 1rem; color: var(--navy); font-size: clamp(2.5rem, 13vw, 5.8rem); line-height: 1.08; letter-spacing: -0.07em; }
.hero-copy { max-width: 35rem; color: var(--muted); font-size: 1.05rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.5rem; }
.hero-visual { position: relative; min-height: 20rem; padding: 1rem; background: var(--navy); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); }
.hero-visual::before, .hero-visual::after { position: absolute; content: ""; border: 1px solid rgba(255,255,255,0.22); border-radius: 999px; }
.hero-visual::before { inset: 18% 10%; }
.hero-visual::after { inset: 29% 20%; }
.building { position: absolute; right: 12%; bottom: 0; left: 12%; height: 78%; background: linear-gradient(100deg, #27496b, #18334f); border-radius: 8px 8px 0 0; }
.building::before { position: absolute; inset: 8% 12%; content: ""; background: repeating-linear-gradient(90deg, transparent 0 1.4rem, rgba(255,255,255,0.14) 1.4rem 1.52rem), repeating-linear-gradient(0deg, transparent 0 1.35rem, rgba(255,255,255,0.12) 1.35rem 1.47rem); }
.lift-door { position: absolute; right: 36%; bottom: 0; left: 36%; height: 56%; background: linear-gradient(90deg, #e8d5c5 0 48%, #caa892 48% 52%, #e8d5c5 52%); border-radius: 0.5rem 0.5rem 0 0; box-shadow: inset 0 0 0 0.5rem rgba(17,36,60,0.25); }
.visual-label { position: absolute; right: 1.25rem; bottom: 1.1rem; left: 1.25rem; display: flex; justify-content: space-between; color: rgba(255,255,255,0.72); font-size: 0.75rem; }

.section { padding: 2rem 0; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 1.25rem; }
.section h2 { margin-bottom: 0.25rem; color: var(--navy); font-size: clamp(1.6rem, 6vw, 2.5rem); line-height: 1.15; letter-spacing: -0.04em; }
.section-intro { max-width: 34rem; margin-bottom: 0; color: var(--muted); font-size: 0.95rem; }
.scheme-grid, .case-grid { display: grid; gap: 1rem; }
.scheme-card, .case-card, .detail-card, .form-card, .success-card, .qr-panel { background: var(--paper); border: 1px solid rgba(17,36,60,0.06); border-radius: var(--radius-md); box-shadow: 0 10px 30px rgba(17,36,60,0.05); }
.scheme-card { overflow: hidden; }
.scheme-card img, .case-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; background: #d8e0e4; }
.image-fallback { display: grid; width: 100%; min-height: 10rem; place-items: center; padding: 1rem; color: var(--navy); background: linear-gradient(135deg, #e6dfd2, #d2dce0); font-size: 0.8rem; font-weight: 700; text-align: center; }
.detail-card .image-fallback { min-height: 34rem; }
.card-body { padding: 1.25rem; }
.card-kicker { margin-bottom: 0.25rem; color: var(--orange-dark); font-size: 0.76rem; font-weight: 800; }
.scheme-card h3, .case-card h3 { margin-bottom: 0.4rem; color: var(--navy); font-size: 1.25rem; }
.card-summary { min-height: 3.2rem; margin-bottom: 1rem; color: var(--muted); font-size: 0.9rem; }
.tags { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-bottom: 1.15rem; }
.tag { padding: 0.28rem 0.55rem; color: var(--navy-soft); background: #eef2f3; border-radius: 999px; font-size: 0.74rem; }
.button { display: inline-flex; min-height: 2.75rem; align-items: center; justify-content: center; gap: 0.4rem; padding: 0.7rem 1rem; border: 1px solid transparent; border-radius: 999px; font-weight: 750; text-decoration: none; transition: transform 180ms ease, background 180ms ease, border-color 180ms ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--paper); background: var(--orange); }
.button-primary:hover { background: var(--orange-dark); }
.button-secondary { color: var(--navy); background: transparent; border-color: rgba(17,36,60,0.2); }
.button-secondary:hover { background: #f0ece4; }
.button-light { color: var(--navy); background: var(--paper); }
.button-block { width: 100%; }
.button[disabled] { cursor: wait; opacity: 0.65; transform: none; }

.comparison { display: grid; gap: 1rem; padding: 1rem; color: var(--paper); background: var(--navy); border-radius: var(--radius-md); }
.comparison-panel { position: relative; min-height: 11rem; padding: 1rem; overflow: hidden; border-radius: var(--radius-sm); }
.comparison-panel::before { position: absolute; inset: 0; content: ""; opacity: 0.75; }
.before-panel::before { background: linear-gradient(140deg, #4b5560, #1f2d3b); }
.after-panel::before { background: linear-gradient(140deg, #f0c49b, #d87744); }
.comparison-panel > * { position: relative; }
.comparison-label { display: inline-block; padding: 0.28rem 0.55rem; color: var(--navy); background: rgba(255,255,255,0.8); border-radius: 999px; font-size: 0.73rem; font-weight: 800; }
.comparison-panel p { max-width: 12rem; margin-top: 4rem; margin-bottom: 0; font-weight: 700; }

.case-card { overflow: hidden; }
.case-card .card-body { padding: 1rem; }
.case-card h3 { font-size: 1rem; }
.case-card p { margin-bottom: 0; color: var(--muted); font-size: 0.82rem; }
.qr-panel { display: grid; gap: 1rem; align-items: center; padding: 1rem; }
.qr-image { width: 8.5rem; height: 8.5rem; padding: 0.5rem; background: white; border-radius: var(--radius-sm); }
.qr-panel h3 { margin-bottom: 0.35rem; color: var(--navy); }
.qr-panel p { margin-bottom: 0; color: var(--muted); font-size: 0.82rem; overflow-wrap: anywhere; }

.inner-page { padding-top: 1.25rem; }
.back-link { display: inline-flex; margin-bottom: 1.25rem; color: var(--navy); font-size: 0.88rem; font-weight: 700; text-decoration: none; }
.detail-card { overflow: hidden; }
.detail-media { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: #d8e0e4; }
.detail-content { padding: 1.25rem; }
.detail-content h1 { max-width: none; margin-bottom: 0.75rem; font-size: clamp(2rem, 10vw, 4.2rem); }
.detail-content h2 { margin-top: 1.6rem; color: var(--navy); font-size: 1.15rem; }
.detail-content p { color: var(--muted); }
.highlight-list { display: grid; gap: 0.65rem; padding: 0; margin: 0; list-style: none; }
.highlight-list li { display: flex; gap: 0.65rem; align-items: start; }
.highlight-list li::before { flex: 0 0 auto; width: 1.3rem; height: 1.3rem; content: "✓"; color: var(--paper); background: var(--orange); border-radius: 50%; font-size: 0.8rem; font-weight: 900; line-height: 1.3rem; text-align: center; }
.detail-meta { display: grid; gap: 0.8rem; padding: 1rem; margin: 1.25rem 0; background: var(--cream); border-radius: var(--radius-sm); }
.detail-meta strong { display: block; color: var(--navy); font-size: 0.82rem; }
.detail-meta span { color: var(--muted); font-size: 0.88rem; }

.form-wrap { max-width: 42rem; margin: 0 auto; }
.form-card { padding: 1.25rem; }
.form-card h1 { max-width: none; margin-bottom: 0.5rem; font-size: clamp(2rem, 9vw, 3.8rem); }
.form-note { margin-bottom: 1.5rem; color: var(--muted); }
.selected-scheme { padding: 0.85rem 1rem; margin-bottom: 1.25rem; color: var(--navy); background: #edf1f0; border-left: 4px solid var(--orange); border-radius: var(--radius-sm); font-size: 0.88rem; }
.field { margin-bottom: 1rem; }
.field label { display: block; margin-bottom: 0.4rem; color: var(--navy); font-size: 0.88rem; font-weight: 750; }
.field input { width: 100%; min-height: 3rem; padding: 0.75rem 0.9rem; color: var(--ink); background: var(--paper); border: 1px solid #cfd3d1; border-radius: var(--radius-sm); }
.field input:focus { border-color: var(--orange); outline: 3px solid rgba(232,113,59,0.17); }
.field input[aria-invalid="true"] { border-color: var(--danger); }
.field-error { min-height: 1.25rem; margin: 0.35rem 0 0; color: var(--danger); font-size: 0.78rem; }
.form-submit-note { min-height: 1.4rem; margin: 0.8rem 0 0; color: var(--muted); font-size: 0.8rem; }

.success-wrap { max-width: 42rem; margin: 0 auto; }
.success-card { padding: 1.5rem; text-align: center; }
.success-icon { display: grid; width: 4rem; height: 4rem; place-items: center; margin: 0 auto 1rem; color: var(--paper); background: var(--success); border-radius: 50%; font-size: 2rem; }
.success-card h1 { max-width: none; margin-bottom: 0.7rem; font-size: clamp(2rem, 9vw, 3.5rem); }
.success-card > p { color: var(--muted); }
.success-detail { padding: 1rem; margin: 1.25rem 0; color: var(--navy); background: var(--cream); border-radius: var(--radius-sm); text-align: left; }
.success-detail p { margin: 0.25rem 0; color: var(--muted); font-size: 0.88rem; }
.success-detail strong { color: var(--navy); }
.success-actions { display: grid; gap: 0.7rem; }
.demo-disclaimer { padding: 0.9rem; color: #6f563d; background: #fbf2df; border-radius: var(--radius-sm); font-size: 0.78rem; text-align: left; }

.sticky-cta { position: sticky; bottom: 0; z-index: 5; padding: 0.75rem 1rem; margin: 1rem -1.25rem -2rem; background: rgba(248,244,236,0.92); border-top: 1px solid var(--line); backdrop-filter: blur(12px); }
.empty-state { padding: 2rem 1rem; color: var(--muted); text-align: center; }

@media (min-width: 680px) {
  .page-shell { padding-right: 2rem; padding-left: 2rem; }
  .hero { grid-template-columns: 1fr 0.9fr; align-items: center; min-height: 36rem; }
  .hero-visual { min-height: 28rem; }
  .scheme-grid { grid-template-columns: repeat(3, 1fr); }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .comparison { grid-template-columns: repeat(2, 1fr); padding: 1.25rem; }
  .qr-panel { grid-template-columns: auto 1fr; padding: 1.25rem; }
  .detail-card { display: grid; grid-template-columns: 0.95fr 1.05fr; }
  .detail-media { height: 100%; min-height: 34rem; aspect-ratio: auto; }
  .detail-content { padding: 2rem; }
  .detail-meta { grid-template-columns: 1fr 1fr; }
  .form-card, .success-card { padding: 2rem; }
  .success-actions { grid-template-columns: 1fr 1fr; }
  .sticky-cta { position: static; padding: 0; margin: 1.5rem 0 0; background: transparent; border: 0; backdrop-filter: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}