:root {
  --ink: #15131b;
  --ink-soft: #211d2a;
  --paper: #f7f2ea;
  --paper-soft: #eee7dd;
  --mist: #d8d0e6;
  --accent: #a697d8;
  --accent-strong: #c4b7f2;
  --focus: #f6d981;
  --line: rgba(247, 242, 234, 0.2);
  --content-width: 1120px;
  --reading-width: 720px;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--paper);
  background: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

button,
a { font: inherit; }

a { color: inherit; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 20;
  padding: 0.55rem 0.75rem;
  color: var(--ink);
  background: var(--focus);
  transform: translateY(-200%);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 4.5rem;
  padding: 0.75rem max(1.25rem, calc((100vw - var(--content-width)) / 2));
  border-bottom: 1px solid rgba(247, 242, 234, 0.12);
  background: color-mix(in srgb, var(--ink) 90%, transparent);
  backdrop-filter: blur(18px);
}

.brand {
  flex: 0 0 auto;
  color: var(--paper);
  font-size: 0.92rem;
  font-weight: 720;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: clamp(0.75rem, 2vw, 1.5rem);
  align-items: center;
  min-width: 0;
  font-size: 0.86rem;
  white-space: nowrap;
}

.site-nav a {
  color: rgba(247, 242, 234, 0.75);
  text-decoration: none;
}

.site-nav a:hover { color: var(--paper); }

.section { padding: clamp(4.75rem, 12vw, 10rem) 1.25rem; }

.content-wrap { width: min(100%, var(--content-width)); margin: 0 auto; }

.narrow-copy { width: min(100%, var(--reading-width)); margin: 0 auto; }

.hero-section {
  display: grid;
  min-height: min(780px, calc(100svh - 4.5rem));
  align-items: end;
  padding-bottom: clamp(5rem, 12vw, 9rem);
  background:
    radial-gradient(circle at 80% 18%, rgba(166, 151, 216, 0.27), transparent 35rem),
    radial-gradient(circle at 12% 88%, rgba(196, 183, 242, 0.12), transparent 28rem),
    var(--ink);
}

.hero-content { max-width: 920px; }

.eyebrow {
  margin: 0 0 1.25rem;
  color: var(--accent-strong);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
p { margin-top: 0; }

h1,
h2 { font-weight: 650; letter-spacing: -0.04em; line-height: 1.12; }

h1 { max-width: 14ch; margin-bottom: 1.5rem; font-size: clamp(3.15rem, 9vw, 7.15rem); }

h2 { margin-bottom: 1.5rem; font-size: clamp(2.2rem, 5.6vw, 4.6rem); }

.hero-lead,
.body-copy { max-width: 42rem; color: rgba(247, 242, 234, 0.78); font-size: clamp(1.05rem, 2vw, 1.3rem); }

.hero-actions,
.contact-actions { display: flex; flex-wrap: wrap; gap: 0.85rem; align-items: center; margin-top: 2.5rem; }

.button,
.text-button,
.text-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.68rem 1.05rem;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 650;
  text-decoration: none;
}

.button-primary { color: var(--ink); background: var(--paper); }
.button-primary:hover { background: #fffaf1; }
.button-secondary { color: var(--paper); border-color: rgba(247, 242, 234, 0.48); background: transparent; }
.button-secondary:hover { border-color: var(--paper); background: rgba(247, 242, 234, 0.08); }
.text-action,
.text-button { padding-right: 0; padding-left: 0; color: var(--accent-strong); background: transparent; }
.text-action::after,
.text-button::after { margin-left: 0.5rem; content: '↗'; }
.text-button { border: 0; }

.statement-section { padding-top: clamp(4rem, 8vw, 7rem); padding-bottom: clamp(4rem, 8vw, 7rem); background: var(--paper); color: var(--ink); }
.statement { margin: 0; font-size: clamp(1.8rem, 4.8vw, 3.8rem); font-weight: 560; letter-spacing: -0.045em; line-height: 1.22; }

.ai-native-section { background: linear-gradient(132deg, #292337, #1d1b25 58%, #3b3151); }
.ai-native-section h2 { max-width: none; }

.section-line { border-top: 1px solid var(--line); }
.section-tint { color: var(--ink); background: var(--paper-soft); }
.section-tint .eyebrow { color: #64558e; }
.section-tint .body-copy { color: rgba(21, 19, 27, 0.78); }
.section-tint .text-button { color: #5d4f86; }

.story-layout { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(2.5rem, 8vw, 8rem); }
.vertical-story { display: grid; grid-template-columns: 1fr; gap: clamp(2.5rem, 8vw, 8rem); }
.vertical-story .body-copy { max-width: 44rem; }
.supporting-copy { margin-bottom: 0; color: var(--accent-strong); }

.practice-section { background: linear-gradient(132deg, #292337, #1d1b25 58%, #3b3151); }
.practice-section h2 { max-width: 14ch; }

.contact-section { padding-top: clamp(5rem, 14vw, 11rem); padding-bottom: clamp(5rem, 14vw, 11rem); }
.contact-content { max-width: 800px; }
.contact-content h2 { max-width: 12ch; }

.site-footer { padding: 1.5rem 1.25rem; border-top: 1px solid var(--line); color: rgba(247, 242, 234, 0.63); font-size: 0.82rem; }
.footer-content { display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.footer-brand { color: var(--paper); }

dialog {
  width: min(calc(100% - 2.5rem), 34rem);
  padding: 0;
  border: 1px solid rgba(247, 242, 234, 0.22);
  border-radius: 1.25rem;
  color: var(--paper);
  background: #24202e;
  box-shadow: 0 1.75rem 5rem rgba(0, 0, 0, 0.48);
}

dialog::backdrop { background: rgba(9, 8, 13, 0.72); backdrop-filter: blur(6px); }
.dialog-content { padding: clamp(1.5rem, 6vw, 3rem); }
.dialog-content h2 { margin-bottom: 1rem; font-size: clamp(2rem, 7vw, 3.2rem); }
.dialog-content .button { margin-top: 1rem; }
.experience-copy { color: rgba(247, 242, 234, 0.78); }
.experience-qr { display: block; width: min(100%, 17rem); margin: 1.5rem 0; border-radius: 0.75rem; background: var(--paper); }

@media (max-width: 720px) {
  .site-header { display: block; padding-top: 0.9rem; padding-bottom: 0.85rem; }
  .site-nav { margin-top: 0.72rem; overflow-x: auto; padding-bottom: 0.18rem; }
  .section { padding-right: 1.25rem; padding-left: 1.25rem; }
  .hero-section { min-height: min(700px, calc(100svh - 5.6rem)); }
  .vertical-story { grid-template-columns: 1fr; gap: 1.5rem; }
  .story-layout { grid-template-columns: 1fr; gap: 1.5rem; }
  .footer-content { align-items: flex-start; flex-direction: column; }
}

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