:root {
  --color-surface: oklch(97% 0.018 85);
  --color-paper: oklch(99% 0.012 86);
  --color-text: oklch(27% 0.025 55);
  --color-muted: oklch(56% 0.03 58);
  --color-accent: oklch(52% 0.16 30);
  --color-accent-soft: oklch(93% 0.055 42);
  --color-line: oklch(88% 0.035 80);
  --color-shadow: oklch(45% 0.045 60 / 0.13);
  --space-section: clamp(5rem, 9vw, 9rem);
  --space-shell: min(7vw, 5rem);
  --radius-large: 2rem;
  --radius-small: 0.9rem;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", system-ui, sans-serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { cursor: pointer; }
.site-header, footer, .content-section, .hero { padding-inline: var(--space-shell); }
.site-header { padding-block: 1.25rem; }
.nav-shell, footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.65rem; font-weight: 700; letter-spacing: 0.12em; }
.brand-mark {
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  background: var(--color-text);
  color: var(--color-paper);
  border-radius: 50%;
  font-family: var(--font-display);
}
.nav-link { color: var(--color-muted); font-size: 0.92rem; }
.hero {
  display: grid;
  min-height: 44rem;
  grid-template-columns: minmax(0, 0.95fr) minmax(24rem, 1.05fr);
  align-items: center;
  gap: 4vw;
  padding-block: 4rem 6rem;
}
.eyebrow, .section-index, .note-label {
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
h1, h2, h3, p { margin-top: 0; }
h1, h2 { font-family: var(--font-display); font-weight: 700; letter-spacing: -0.06em; line-height: 1.12; }
h1 { max-width: 9em; margin-bottom: 1.5rem; font-size: clamp(3.6rem, 7vw, 7.2rem); }
h1 span { color: var(--color-accent); }
h2 { font-size: clamp(2.5rem, 4.5vw, 4.8rem); }
h3 { font-size: 1.2rem; }
.hero-lead { max-width: 34rem; color: var(--color-muted); font-size: 1.12rem; }
.hero-actions, .form-row { display: flex; flex-wrap: wrap; gap: 0.9rem; align-items: center; }
.cta-primary, .cta-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.3rem;
  padding: 0.8rem 1.3rem;
  border-radius: 999px;
  border: 1px solid var(--color-accent);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease), background 180ms var(--ease);
}
.cta-primary { background: var(--color-accent); color: var(--color-paper); font-weight: 800; }
.cta-secondary { color: var(--color-accent); }
.cta-primary:hover, .cta-secondary:hover { transform: translateY(-2px); box-shadow: 0 0.7rem 1.2rem var(--color-shadow); }
.cta-note { margin-top: 0.8rem; color: var(--color-muted); font-size: 0.82rem; }
.hero-stage { animation: float-in 850ms var(--ease) both; }
.desk-card {
  position: relative;
  min-height: 34rem;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-large);
  background: var(--color-paper);
  box-shadow: 0 1.4rem 3rem var(--color-shadow);
}
.camera-pill {
  position: absolute;
  top: 1.4rem;
  left: 1.4rem;
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-muted);
  font-size: 0.78rem;
}
.camera-dot { display: inline-block; width: 0.55rem; height: 0.55rem; margin-right: 0.35rem; border-radius: 50%; background: var(--color-accent); animation: pulse 1.8s ease-in-out infinite; }
.paper-sheet {
  position: absolute;
  top: 7rem;
  right: 4rem;
  width: 15rem;
  height: 19rem;
  border: 1px solid var(--color-line);
  background: var(--color-surface);
  box-shadow: 0 1rem 2rem var(--color-shadow);
  transform: rotate(-4deg);
}
.paper-sheet::before, .paper-sheet::after { content: ""; position: absolute; background: var(--color-line); }
.paper-sheet::before { left: 50%; top: 0; bottom: 0; width: 1px; }
.paper-sheet::after { top: 50%; left: 0; right: 0; height: 1px; }
.ink { position: absolute; z-index: 1; font-family: var(--font-display); font-size: 7rem; line-height: 1; }
.ink-one { top: 1.5rem; left: 1.4rem; }
.ink-two { right: 1.4rem; bottom: 1.1rem; opacity: 0.6; }
.phone-frame {
  position: absolute;
  left: 2.6rem;
  bottom: 3.2rem;
  width: 10rem;
  height: 16rem;
  padding: 0.5rem;
  border: 0.35rem solid var(--color-text);
  border-radius: 1.3rem;
  background: var(--color-paper);
  transform: rotate(7deg);
}
.phone-screen { position: relative; height: 100%; overflow: hidden; border-radius: 0.6rem; background: var(--color-accent-soft); }
.scan-line { position: absolute; left: 0; right: 0; top: 30%; height: 1px; background: var(--color-accent); animation: scan 3s ease-in-out infinite; }
.posture-dot { position: absolute; width: 0.8rem; height: 0.8rem; border: 2px solid var(--color-accent); border-radius: 50%; }
.dot-head { top: 26%; left: 58%; }
.dot-wrist { top: 62%; left: 31%; }
.coach-note {
  position: absolute;
  right: 1.5rem;
  bottom: 1.5rem;
  display: grid;
  gap: 0.3rem;
  width: 15rem;
  padding: 1.1rem;
  border-left: 0.25rem solid var(--color-accent);
  background: var(--color-surface);
  box-shadow: 0 0.8rem 1.6rem var(--color-shadow);
}
.coach-note span:last-child { color: var(--color-muted); font-size: 0.88rem; }
.trust-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  gap: 1rem;
  padding: 1.2rem var(--space-shell);
  border-block: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 0.9rem;
}
.trust-strip p { margin: 0; }
.content-section { padding-block: var(--space-section); }
.split-section, .pricing-section, .faq-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(20rem, 1.1fr);
  gap: 8vw;
}
.copy-stack { padding-top: 2rem; color: var(--color-muted); font-size: 1.12rem; }
.section-heading { max-width: 42rem; }
.section-heading > p:last-child { color: var(--color-muted); }
.steps { display: grid; gap: 1rem; margin: 3rem 0 0; padding: 0; list-style: none; }
.steps li {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 1rem;
  padding: 1.5rem;
  border-top: 1px solid var(--color-line);
  background: var(--color-paper);
}
.steps p { margin-bottom: 0; color: var(--color-muted); }
.step-no { color: var(--color-accent); font-family: var(--font-display); font-size: 2rem; }
.promise-section { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 2rem; background: var(--color-text); color: var(--color-paper); }
.promise-card { max-width: 55rem; }
.promise-card p:last-child { max-width: 48rem; color: var(--color-line); }
.red-stamp { padding: 1.4rem; border: 0.2rem solid var(--color-accent); color: var(--color-accent); font-family: var(--font-display); font-size: 2rem; line-height: 1.1; transform: rotate(-7deg); }
.price-panel { padding: 2rem; border: 1px solid var(--color-line); border-radius: var(--radius-large); background: var(--color-paper); box-shadow: 0 1.3rem 2.5rem var(--color-shadow); }
.price { margin-bottom: 0.5rem; color: var(--color-accent); font-family: var(--font-display); font-size: 5rem; line-height: 1; }
.price span { font-size: 2rem; }
.price small { color: var(--color-muted); font-family: var(--font-body); font-size: 1rem; }
.price-panel > p:not(.price) { color: var(--color-muted); }
.cta-wide { width: 100%; }
.faq-list details { padding: 1rem 0; border-top: 1px solid var(--color-line); }
.faq-list summary { cursor: pointer; font-weight: 700; }
.faq-list p { padding-right: 2rem; color: var(--color-muted); }
footer { padding-block: 2.5rem; border-top: 1px solid var(--color-line); color: var(--color-muted); font-size: 0.9rem; }
footer p { margin: 0; }
.fakedoor[hidden] { display: none; }
.fakedoor { position: fixed; z-index: 20; inset: 0; display: grid; place-items: center; padding: 1rem; }
.modal-backdrop { position: absolute; inset: 0; background: oklch(20% 0.02 55 / 0.55); }
.modal-card { position: relative; width: min(35rem, 100%); padding: 2rem; border-radius: var(--radius-large); background: var(--color-paper); box-shadow: 0 1.5rem 4rem oklch(20% 0.02 55 / 0.25); animation: modal-in 280ms var(--ease) both; }
.modal-close { position: absolute; top: 1rem; right: 1rem; border: 0; background: transparent; color: var(--color-muted); font-size: 1.6rem; }
label { display: block; margin-bottom: 0.5rem; font-size: 0.85rem; font-weight: 800; }
input { min-width: 0; flex: 1; min-height: 3.3rem; padding: 0.8rem 1rem; border: 1px solid var(--color-line); border-radius: 999px; background: var(--color-surface); color: var(--color-text); }
.form-status { margin: 0.8rem 0 0; color: var(--color-accent); font-size: 0.86rem; }
@keyframes float-in { from { opacity: 0; transform: translateY(1.5rem); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 50% { opacity: 0.35; transform: scale(0.78); } }
@keyframes scan { 0%, 100% { transform: translateY(-1.5rem); opacity: 0.3; } 50% { transform: translateY(8rem); opacity: 1; } }
@keyframes modal-in { from { opacity: 0; transform: translateY(1rem) scale(0.98); } to { opacity: 1; transform: translateY(0) scale(1); } }
@media (max-width: 820px) {
  .hero, .split-section, .pricing-section, .faq-section { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 2rem; }
  .hero-stage { order: -1; }
  .desk-card { min-height: 27rem; }
  .paper-sheet { right: 2rem; width: 11rem; height: 14rem; }
  .ink { font-size: 5rem; }
  .phone-frame { left: 1.4rem; bottom: 2rem; width: 7rem; height: 12rem; }
  .coach-note { width: 12rem; }
  .promise-section { grid-template-columns: 1fr; }
  footer { align-items: flex-start; flex-direction: column; }
}