@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --canvas: #f7f7f4;
  --canvas-soft: #fafaf7;
  --surface-card: #ffffff;
  --surface-strong: #e6e5e0;
  --hairline: #e6e5e0;
  --hairline-soft: #efeee8;
  --hairline-strong: #cfcdc4;
  --ink: #26251e;
  --body: #5a5852;
  --muted: #807d72;
  --muted-soft: #a09c92;
  --primary: #f54e00;
  --primary-active: #d04200;
  --on-primary: #ffffff;
  --success: #1f8a65;
  --error: #cf2d56;
  --font-sans: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Mono', monospace;
}

html { font-size: 16px; scroll-behavior: smooth; }
body { background: var(--canvas); color: var(--body); font-family: var(--font-sans); font-size: 16px; line-height: 1.5; }

a { color: var(--ink); text-decoration: none; }
a:hover { color: var(--primary); }

img { max-width: 100%; height: auto; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.site-header {
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  height: 64px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-logo {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.02em;
}
.site-logo span { color: var(--primary); }

.site-nav { display: flex; align-items: center; gap: 32px; }
.site-nav a { font-size: 14px; font-weight: 500; color: var(--body); transition: color 0.15s; }
.site-nav a:hover { color: var(--ink); }
.site-nav a.active { color: var(--ink); }

.nav-hamburger { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-hamburger span { display: block; width: 20px; height: 2px; background: var(--ink); margin: 4px 0; }

.site-footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding: 48px 0 32px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand { max-width: 260px; }
.footer-brand .site-logo { margin-bottom: 12px; }
.footer-brand p { font-size: 14px; color: var(--body); line-height: 1.5; }

.footer-col h4 { font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--ink); margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: var(--body); margin-bottom: 8px; }
.footer-col a:hover { color: var(--ink); }

.footer-bottom { border-top: 1px solid var(--hairline-soft); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; }
.footer-bottom p { font-size: 14px; color: var(--muted); }

.hero-band { padding: 80px 0; }
.hero-band h1 { font-size: 72px; font-weight: 400; line-height: 1.1; letter-spacing: -2.16px; color: var(--ink); margin-bottom: 24px; max-width: 800px; }
.hero-band p.hero-sub { font-size: 16px; color: var(--body); max-width: 560px; line-height: 1.5; margin-bottom: 40px; }

.badge-pill {
  display: inline-block;
  background: var(--surface-strong);
  color: var(--ink);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  border-radius: 9999px;
  padding: 4px 10px;
  margin-bottom: 20px;
}

.section { padding: 80px 0; }
.section-label { font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; }
.section-title { font-size: 36px; font-weight: 400; line-height: 1.2; letter-spacing: -0.72px; color: var(--ink); margin-bottom: 16px; }
.section-sub { font-size: 16px; color: var(--body); max-width: 560px; margin-bottom: 48px; }

.card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 24px;
}

.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }

.card h3 { font-size: 18px; font-weight: 600; color: var(--ink); margin-bottom: 10px; line-height: 1.4; }
.card p { font-size: 14px; color: var(--body); line-height: 1.5; }
.card .card-tag { display: inline-block; background: var(--surface-strong); border-radius: 4px; font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); padding: 2px 8px; margin-bottom: 12px; }
.card .card-meta { font-size: 13px; color: var(--muted); margin-top: 12px; }

.article-card { display: flex; flex-direction: column; }
.article-card img { border-radius: 8px; margin-bottom: 16px; width: 100%; height: 180px; object-fit: cover; }
.article-card h3 { font-size: 18px; font-weight: 600; color: var(--ink); margin-bottom: 8px; line-height: 1.4; }
.article-card h3 a { color: var(--ink); }
.article-card h3 a:hover { color: var(--primary); }

.code-block {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
  overflow-x: auto;
  line-height: 1.5;
}

pre, code { font-family: var(--font-mono); font-size: 13px; }
pre { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: 12px; padding: 20px; overflow-x: auto; line-height: 1.5; color: var(--ink); }
code { background: var(--surface-strong); border-radius: 4px; padding: 1px 5px; color: var(--ink); }
pre code { background: none; padding: 0; }

.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: var(--on-primary);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 18px;
  height: 40px;
  line-height: 20px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-primary:hover { background: var(--primary-active); color: var(--on-primary); }

.btn-secondary {
  display: inline-block;
  background: var(--surface-card);
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 18px;
  height: 40px;
  line-height: 20px;
  border-radius: 8px;
  border: 1px solid var(--hairline-strong);
  cursor: pointer;
  transition: border-color 0.15s;
}
.btn-secondary:hover { border-color: var(--ink); }

.divider { border: none; border-top: 1px solid var(--hairline); margin: 48px 0; }

.text-input {
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: 8px;
  padding: 12px 16px;
  height: 44px;
  font-size: 16px;
  font-family: var(--font-sans);
  color: var(--ink);
  width: 100%;
  outline: none;
  transition: border-color 0.15s;
}
.text-input:focus { border-color: var(--ink); }

textarea.text-input { height: auto; resize: vertical; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; color: var(--ink); margin-bottom: 6px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.alert { border-radius: 8px; padding: 16px; font-size: 14px; }
.alert-success { background: #e8f5f1; color: var(--success); border: 1px solid #b8dfd3; }
.alert-error { background: #fdedf1; color: var(--error); border: 1px solid #f1b8c6; }

.article-header { padding: 60px 0 40px; border-bottom: 1px solid var(--hairline); margin-bottom: 40px; }
.article-header h1 { font-size: 48px; font-weight: 400; line-height: 1.15; letter-spacing: -1.2px; color: var(--ink); margin-bottom: 16px; }
.article-header .article-meta { font-size: 14px; color: var(--muted); display: flex; gap: 16px; flex-wrap: wrap; }

.article-body { max-width: 760px; }
.article-body h2 { font-size: 26px; font-weight: 400; letter-spacing: -0.325px; color: var(--ink); margin: 40px 0 16px; }
.article-body h3 { font-size: 22px; font-weight: 400; letter-spacing: -0.11px; color: var(--ink); margin: 28px 0 12px; }
.article-body p { font-size: 16px; color: var(--body); margin-bottom: 20px; line-height: 1.6; }
.article-body ul, .article-body ol { margin: 0 0 20px 24px; color: var(--body); line-height: 1.6; }
.article-body li { margin-bottom: 8px; }
.article-body a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.article-body a:hover { color: var(--primary); }

.article-layout { display: grid; grid-template-columns: 1fr 300px; gap: 60px; align-items: start; }
.article-sidebar { position: sticky; top: 84px; }
.article-sidebar .card { margin-bottom: 16px; }
.article-sidebar h4 { font-size: 13px; font-weight: 600; color: var(--ink); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 0.88px; }
.article-sidebar a { display: block; font-size: 14px; color: var(--body); padding: 6px 0; border-bottom: 1px solid var(--hairline-soft); }
.article-sidebar a:last-child { border-bottom: none; }
.article-sidebar a:hover { color: var(--ink); }

.page-hero { padding: 60px 0; border-bottom: 1px solid var(--hairline); margin-bottom: 60px; }
.page-hero h1 { font-size: 48px; font-weight: 400; letter-spacing: -1.2px; color: var(--ink); margin-bottom: 16px; }
.page-hero p { font-size: 16px; color: var(--body); max-width: 640px; }

.prose h2 { font-size: 26px; font-weight: 400; letter-spacing: -0.325px; color: var(--ink); margin: 40px 0 16px; }
.prose h3 { font-size: 20px; font-weight: 600; color: var(--ink); margin: 28px 0 12px; }
.prose p { font-size: 16px; color: var(--body); margin-bottom: 20px; line-height: 1.6; }
.prose ul, .prose ol { margin: 0 0 20px 24px; color: var(--body); line-height: 1.6; }
.prose li { margin-bottom: 8px; }
.prose a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.prose a:hover { color: var(--primary); }

.tech-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.tech-item { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: 12px; padding: 20px 16px; text-align: center; }
.tech-item img { width: 48px; height: 48px; object-fit: contain; margin: 0 auto 12px; }
.tech-item span { font-size: 13px; font-weight: 500; color: var(--ink); display: block; }

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface-card);
  border-top: 1px solid var(--hairline);
  padding: 20px 24px;
  z-index: 200;
  display: none;
}
.cookie-banner.visible { display: block; }
.cookie-inner { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.cookie-inner p { font-size: 14px; color: var(--body); flex: 1; min-width: 280px; }
.cookie-inner p a { color: var(--ink); text-decoration: underline; }
.cookie-actions { display: flex; gap: 12px; flex-shrink: 0; }

.loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--on-primary);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hero-img-wrap { margin-top: 48px; border-radius: 12px; overflow: hidden; border: 1px solid var(--hairline); }
.hero-img-wrap img { width: 100%; height: 400px; object-fit: cover; }

@media (max-width: 1024px) {
  .hero-band h1 { font-size: 56px; letter-spacing: -1.5px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .tech-grid { grid-template-columns: repeat(3, 1fr); }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .site-nav { display: none; }
  .site-nav.open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--canvas); border-bottom: 1px solid var(--hairline); padding: 16px 24px; gap: 16px; }
  .nav-hamburger { display: block; }
  .hero-band h1 { font-size: 32px; letter-spacing: -0.72px; }
  .section-title { font-size: 28px; }
  .card-grid { grid-template-columns: 1fr; }
  .card-grid-2 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .article-header h1 { font-size: 32px; }
  .page-hero h1 { font-size: 36px; }
}