/* MER3Y — Claude / Anthropic 暖色编辑风 */

:root {
  --primary: #cc785c;
  --primary-active: #a9583e;
  --canvas: #faf9f5;
  --surface-soft: #f5f0e8;
  --surface-card: #efe9de;
  --surface-cream-strong: #e8e0d2;
  --surface-dark: #181715;
  --surface-dark-soft: #1f1e1b;
  --surface-dark-elevated: #252320;
  --ink: #141413;
  --body: #3d3d3a;
  --body-strong: #252523;
  --muted: #6c6a64;
  --muted-soft: #8e8b82;
  --on-primary: #ffffff;
  --on-dark: #faf9f5;
  --on-dark-soft: #a09d96;
  --hairline: #e6dfd8;
  --hairline-soft: #ebe6df;
  --accent-teal: #5db8a6;

  --font-display: 'Cormorant Garamond', Garamond, 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-code: 'JetBrains Mono', ui-monospace, monospace;

  --maxw: 1200px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--body);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--ink);
  margin: 0;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 16px;
}
.eyebrow.on-dark { color: var(--accent-teal); }

/* ---- Navigation ---- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 249, 245, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.site-nav.scrolled {
  border-bottom-color: var(--hairline);
  box-shadow: 0 1px 3px rgba(20, 20, 19, 0.05);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  height: 64px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.brand-mark { color: var(--primary); font-size: 18px; line-height: 1; }
.brand-word {
  font-family: var(--font-display);
  font-size: 24px;
  letter-spacing: -0.5px;
  color: var(--ink);
}
.brand-word.on-dark { color: var(--on-dark); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links .nav-cta {
  color: var(--on-primary);
  background: var(--primary);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  transition: background 0.2s ease;
}
.nav-links .nav-cta:hover { color: var(--on-primary); background: var(--primary-active); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 22px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.btn-primary { background: var(--primary); color: var(--on-primary); }
.btn-primary:hover { background: var(--primary-active); }
.btn-secondary { background: var(--canvas); color: var(--ink); border: 1px solid var(--hairline); }
.btn-secondary:hover { border-color: var(--muted-soft); }
.btn-on-coral { background: var(--canvas); color: var(--ink); }
.btn-on-coral:hover { background: #fff; }

/* ---- Hero ---- */
.hero { padding: 88px 24px 96px; }
.hero-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-title {
  font-size: clamp(72px, 12vw, 128px);
  line-height: 0.95;
  letter-spacing: -3px;
  margin: 8px 0 24px;
}
.hero-lead {
  font-size: 19px;
  line-height: 1.6;
  color: var(--body-strong);
  max-width: 34ch;
  margin: 0 0 32px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  margin-bottom: 36px;
}
.meta-item { display: flex; flex-direction: column; gap: 4px; }
.meta-label {
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
}
.meta-value { font-size: 16px; font-weight: 500; color: var(--ink); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }

.hero-card {
  background: var(--surface-card);
  border-radius: var(--radius-xl);
  padding: 32px;
}
.card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--hairline);
}
.card-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent-teal); }
.card-title { font-size: 13px; font-weight: 500; letter-spacing: 0.5px; color: var(--muted); text-transform: uppercase; }
.stack-list { list-style: none; margin: 0; padding: 0; }
.stack-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--hairline-soft);
  font-size: 15px;
}
.stack-list li:last-child { border-bottom: none; }
.stack-key { color: var(--muted); }
.stack-val { color: var(--ink); font-weight: 500; text-align: right; }

/* ---- Sections ---- */
.section { padding: 96px 24px; }
.section-inner { max-width: var(--maxw); margin: 0 auto; }
.section-head { margin-bottom: 48px; }
.section-title { font-size: clamp(34px, 5vw, 48px); letter-spacing: -1px; line-height: 1.1; }
.section-title.on-dark { color: var(--on-dark); }
.section-lead { font-size: 17px; line-height: 1.7; color: var(--body-strong); max-width: 60ch; margin: 18px 0 0; }

/* ---- Architecture (main line) ---- */
.architecture { background: var(--canvas); }
.arch-stack {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  max-width: 760px;
  margin: 0 auto;
}
.arch-layer {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 20px 26px;
}
.arch-layer.arch-highlight {
  background: var(--primary);
  border-color: var(--primary);
}
.arch-tier {
  flex: 0 0 84px;
  font-family: var(--font-code);
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
}
.arch-highlight .arch-tier { color: rgba(255, 255, 255, 0.8); }
.arch-body { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.arch-name { font-size: 17px; font-weight: 500; color: var(--ink); }
.arch-note { font-size: 13px; color: var(--muted); overflow-wrap: break-word; }
.arch-highlight .arch-name { color: var(--on-primary); }
.arch-highlight .arch-note { color: rgba(255, 255, 255, 0.82); }
.arch-flow {
  text-align: center;
  color: var(--muted-soft);
  font-size: 18px;
  line-height: 1;
  padding: 8px 0;
}

/* ---- Projects (cream cards) ---- */
.projects { background: var(--surface-soft); }
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.project-card {
  position: relative;
  background: var(--surface-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid transparent;
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.project-card:hover { transform: translateY(-4px); border-color: var(--hairline); }
.project-card.feature { grid-column: span 2; }
.project-index {
  font-family: var(--font-code);
  font-size: 13px;
  color: var(--primary);
  letter-spacing: 1px;
}
.project-name { font-size: 28px; letter-spacing: -0.5px; margin: 8px 0 6px; }
.project-tagline { font-size: 15px; color: var(--muted); margin: 0 0 18px; }
.project-points { margin: 0 0 20px; padding-left: 18px; color: var(--body); }
.project-points li { margin-bottom: 8px; line-height: 1.6; overflow-wrap: break-word; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-family: var(--font-code);
  font-size: 12px;
  color: var(--body);
  background: var(--canvas);
  border: 1px solid var(--hairline);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}

/* ---- Community (cream, coral-accented) ---- */
.community { background: var(--canvas); }
.community-card {
  background: var(--surface-card);
  border-radius: var(--radius-lg);
  border-left: 3px solid var(--primary);
  padding: 40px;
}
.community-role { margin-bottom: 22px; }
.community-name { font-size: 26px; letter-spacing: -0.5px; margin-bottom: 6px; }
.community-sub { font-family: var(--font-code); font-size: 13px; color: var(--primary); margin: 0; }
.community-points { margin: 0 0 22px; padding-left: 18px; color: var(--body); }
.community-points li { margin-bottom: 12px; line-height: 1.7; overflow-wrap: break-word; }
.community-points strong { color: var(--body-strong); font-weight: 600; }

/* ---- Capability (dark surface) ---- */
.capability { background: var(--surface-dark); }
.capability-layout {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: start;
}
.capability-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.cap-item {
  background: var(--surface-dark-elevated);
  border-radius: var(--radius-lg);
  padding: 26px;
}
.cap-name { color: var(--on-dark); font-size: 22px; letter-spacing: -0.3px; margin-bottom: 10px; }
.cap-desc { color: var(--on-dark-soft); font-size: 14px; line-height: 1.6; margin: 0; }

.code-window {
  background: var(--surface-dark-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.06);
}
.code-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  background: var(--surface-dark-elevated);
}
.code-dot { width: 11px; height: 11px; border-radius: 50%; background: #3a3833; }
.code-dot:nth-child(1) { background: #cc785c; }
.code-file {
  margin-left: 10px;
  font-family: var(--font-code);
  font-size: 12px;
  color: var(--on-dark-soft);
}
.code-body {
  margin: 0;
  padding: 22px 24px;
  font-family: var(--font-code);
  font-size: 14px;
  line-height: 1.7;
  color: var(--on-dark);
  overflow-x: auto;
}
.c-key { color: #cc785c; }
.c-fn { color: #5db8a6; }
.c-str { color: #e8a55a; }

/* ---- Studio ---- */
.studio { background: var(--canvas); }
.studio-card {
  background: var(--surface-card);
  border-radius: var(--radius-lg);
  padding: 40px;
}
.studio-desc { font-size: 17px; line-height: 1.7; color: var(--body-strong); max-width: 62ch; margin: 0 0 24px; }

/* ---- Live showcase ---- */
.showcase-head { margin: 48px 0 24px; }
.showcase-label {
  display: inline-block;
  font-family: var(--font-code);
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 10px;
}
.showcase-note { font-size: 15px; line-height: 1.7; color: var(--muted); max-width: 60ch; margin: 0; }
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.showcase-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 26px 26px 22px;
  text-decoration: none;
  box-shadow: 0 1px 2px rgba(20, 20, 19, 0.04);
  overflow: hidden;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.showcase-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.showcase-card:hover {
  transform: translateY(-6px);
  border-color: var(--hairline);
  box-shadow: 0 14px 30px rgba(20, 20, 19, 0.1);
}
.showcase-card:hover::before { transform: scaleX(1); }
.showcase-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.showcase-index {
  font-family: var(--font-code);
  font-size: 22px;
  font-weight: 500;
  color: var(--primary);
  letter-spacing: 1px;
  line-height: 1;
}
.showcase-name {
  font-family: var(--font-display);
  font-size: 26px;
  letter-spacing: -0.5px;
  color: var(--ink);
  margin: 0 0 10px;
}
.showcase-arrow {
  color: var(--muted-soft);
  font-size: 20px;
  line-height: 1;
  transition: transform 0.25s ease, color 0.25s ease;
}
.showcase-card:hover .showcase-arrow {
  color: var(--primary);
  transform: translate(3px, -3px);
}
.showcase-desc { font-size: 14px; line-height: 1.65; color: var(--body); margin: 0 0 18px; overflow-wrap: break-word; }
.showcase-card .tag-row { margin-bottom: 18px; }
.showcase-host {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--hairline-soft);
  font-family: var(--font-code);
  font-size: 13px;
  letter-spacing: 0.3px;
  color: var(--muted);
  transition: color 0.25s ease;
}
.showcase-card:hover .showcase-host { color: var(--primary); }

/* ---- Coral CTA ---- */
.cta-wrap { background: var(--surface-soft); padding: 96px 0; }
.cta-card {
  margin-top: 64px;
  background: var(--primary);
  color: var(--on-primary);
  border-radius: var(--radius-lg);
  padding: 64px 48px;
  text-align: center;
}
.cta-title { color: var(--on-primary); font-size: clamp(30px, 4.5vw, 44px); letter-spacing: -0.5px; margin-bottom: 14px; }
.cta-sub { font-size: 17px; color: rgba(255, 255, 255, 0.85); margin: 0 0 28px; }

/* ---- Footer ---- */
.site-footer { background: var(--surface-dark); color: var(--on-dark-soft); padding: 64px 24px 40px; }
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 40px;
  align-items: start;
}
.footer-brand { display: flex; align-items: center; gap: 10px; }
.contact-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.contact-list li { display: flex; flex-direction: column; gap: 6px; }
.contact-key { font-size: 12px; letter-spacing: 1px; text-transform: uppercase; color: var(--muted-soft); }
.contact-list a, .contact-val { color: var(--on-dark); font-size: 15px; text-decoration: none; overflow-wrap: break-word; }
.contact-list a { border-bottom: 1px solid rgba(255, 255, 255, 0.2); width: fit-content; transition: border-color 0.2s ease; }
.contact-list a:hover { border-bottom-color: var(--primary); }
.footer-base {
  max-width: var(--maxw);
  margin: 48px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--muted-soft);
}
.footer-stack { font-family: var(--font-code); }

/* ---- Reveal animation ---- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .capability-layout { grid-template-columns: 1fr; gap: 32px; }
  .footer-inner { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .section { padding: 72px 20px; }
  .hero { padding: 56px 20px 72px; }
  .project-grid { grid-template-columns: 1fr; }
  .project-card.feature { grid-column: span 1; }
  .showcase-grid { grid-template-columns: 1fr; }
  .capability-grid { grid-template-columns: 1fr; }
  .contact-list { grid-template-columns: 1fr; }
  /* 窄屏隐藏文字锚点，只留品牌 + 联系按钮，避免换行砸到 Logo */
  .nav-links { gap: 12px; }
  .nav-links a:not(.nav-cta) { display: none; }
  .hero-meta { gap: 16px 24px; }
  .cta-card {
  margin-top: 64px; padding: 48px 24px; }
  .studio-card { padding: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .project-card, .site-nav { transition: none; }
}