:root {
  --canvas: #f7f7f4;
  --canvas-soft: #fafaf7;
  --card: #ffffff;
  --surface-strong: #e6e5e0;
  --ink: #26251e;
  --body: #5a5852;
  --body-strong: #26251e;
  --muted: #807d72;
  --muted-soft: #a09c92;
  --primary: #f54e00;
  --primary-active: #d04200;
  --on-primary: #ffffff;
  --hairline: #e6e5e0;
  --hairline-soft: #efeee8;
  --hairline-strong: #cfcdc4;
  --success: #1f8a65;
  --error: #cf2d56;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--canvas);
  color: var(--body);
  font-family: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }

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

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo { display: flex; flex-direction: column; gap: 2px; }
.nav-logo-name { font-size: 16px; font-weight: 600; color: var(--ink); letter-spacing: -0.2px; }
.nav-logo-name span { color: var(--primary); }
.nav-logo-sub { font-size: 11px; color: var(--muted); letter-spacing: 0.5px; text-transform: uppercase; }

.nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--body); transition: color 0.15s; }
.nav-links a:hover, .nav-links a.active { color: var(--ink); }

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}
.nav-hamburger span { display: block; width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: all 0.2s; }

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

.hero { padding: 80px 0; border-bottom: 1px solid var(--hairline); }
.hero-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 72px;
  font-weight: 400;
  letter-spacing: -2.16px;
  line-height: 1.1;
  color: var(--ink);
  max-width: 820px;
  margin-bottom: 24px;
}
.hero-sub { font-size: 16px; color: var(--body); max-width: 560px; line-height: 1.5; margin-bottom: 40px; }
.hero-img { margin-top: 48px; border-radius: 12px; border: 1px solid var(--hairline); overflow: hidden; background: var(--card); }
.hero-img img { width: 100%; max-height: 440px; object-fit: cover; }

.section { padding: 80px 0; }
.section + .section { border-top: 1px solid var(--hairline); }

.section-label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 20px;
}
.section-title { font-size: 36px; font-weight: 400; letter-spacing: -0.72px; color: var(--ink); margin-bottom: 16px; }
.section-sub { font-size: 16px; color: var(--body); max-width: 560px; line-height: 1.5; margin-bottom: 48px; }

.articles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.article-card { background: var(--card); border: 1px solid var(--hairline); border-radius: 12px; overflow: hidden; transition: border-color 0.15s; }
.article-card:hover { border-color: var(--hairline-strong); }
.article-card-img { width: 100%; height: 200px; object-fit: cover; background: var(--canvas-soft); }
.article-card-body { padding: 24px; }

.article-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  background: var(--surface-strong);
  color: var(--ink);
  border-radius: 9999px;
  padding: 4px 10px;
  margin-bottom: 12px;
}

.article-card h3 { font-size: 18px; font-weight: 600; color: var(--ink); line-height: 1.4; margin-bottom: 10px; }
.article-card p { font-size: 14px; color: var(--body); line-height: 1.5; margin-bottom: 20px; }
.article-meta { font-size: 13px; color: var(--muted); }
.article-read-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  border-bottom: 1px solid var(--hairline-strong);
  padding-bottom: 2px;
  margin-top: 16px;
  transition: border-color 0.15s, color 0.15s;
}
.article-read-link:hover { color: var(--primary); border-color: var(--primary); }

.article-header { padding: 60px 0 40px; border-bottom: 1px solid var(--hairline); }
.article-header h1 {
  font-size: 48px;
  font-weight: 400;
  letter-spacing: -1.5px;
  line-height: 1.15;
  color: var(--ink);
  max-width: 800px;
  margin-bottom: 20px;
}
.article-header .article-meta { font-size: 14px; color: var(--muted); margin-top: 8px; }
.article-hero-img { margin: 40px 0; border-radius: 12px; border: 1px solid var(--hairline); overflow: hidden; }
.article-hero-img img { width: 100%; max-height: 480px; object-fit: cover; }
.article-body { padding: 0 0 80px; }

.article-content { max-width: 720px; }
.article-content h2 { font-size: 26px; font-weight: 400; letter-spacing: -0.325px; color: var(--ink); margin: 40px 0 16px; }
.article-content h3 { font-size: 18px; font-weight: 600; color: var(--ink); margin: 28px 0 12px; }
.article-content p { font-size: 16px; color: var(--body); line-height: 1.7; margin-bottom: 18px; }
.article-content ul, .article-content ol { padding-left: 24px; margin-bottom: 18px; }
.article-content li { font-size: 16px; color: var(--body); line-height: 1.7; margin-bottom: 6px; }
.article-content a { color: var(--ink); border-bottom: 1px solid var(--hairline-strong); transition: color 0.15s; }
.article-content a:hover { color: var(--primary); }

.info-box { background: var(--card); border: 1px solid var(--hairline); border-radius: 12px; padding: 24px; margin: 32px 0; }
.info-box-label { display: block; font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.info-box h4 { font-size: 16px; font-weight: 600; color: var(--ink); margin-bottom: 8px; }
.info-box p { font-size: 14px; color: var(--body); line-height: 1.6; margin-bottom: 0; }

.code-block {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 20px;
  margin: 24px 0;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 13px;
  color: var(--ink);
  overflow-x: auto;
  line-height: 1.6;
}

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

.related-articles { border-top: 1px solid var(--hairline); padding: 48px 0 80px; }
.related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 32px; }

.contact-form { background: var(--card); border: 1px solid var(--hairline); border-radius: 12px; padding: 32px; max-width: 560px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; color: var(--ink); margin-bottom: 8px; }
.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--card);
  border: 1px solid var(--hairline-strong);
  border-radius: 8px;
  padding: 12px 16px;
  height: 44px;
  font-size: 16px;
  color: var(--ink);
  font-family: inherit;
  transition: border-color 0.15s;
  outline: none;
}
.form-group textarea { height: auto; min-height: 120px; resize: vertical; }
.form-group input:focus, .form-group textarea:focus { border-color: var(--ink); }
.form-group input.error, .form-group textarea.error { border-color: var(--error); }

.form-error-msg { font-size: 13px; color: var(--error); margin-top: 4px; display: none; }
.form-error-msg.visible { display: block; }

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  height: 40px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
  display: inline-flex;
  align-items: center;
}
.btn-primary:hover { background: var(--primary-active); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.form-success { display: none; background: var(--card); border: 1px solid var(--hairline); border-radius: 12px; padding: 24px; text-align: center; }
.form-success.visible { display: block; }
.form-success p { font-size: 16px; color: var(--body); line-height: 1.6; }
.form-success strong { color: var(--success); }

.page-header { padding: 60px 0; border-bottom: 1px solid var(--hairline); }
.page-header h1 { font-size: 48px; font-weight: 400; letter-spacing: -1.5px; color: var(--ink); margin-bottom: 16px; }
.page-header p { font-size: 16px; color: var(--body); max-width: 560px; }

.page-content { padding: 60px 0 80px; }
.page-content h2 { font-size: 26px; font-weight: 400; letter-spacing: -0.325px; color: var(--ink); margin: 40px 0 16px; }
.page-content h3 { font-size: 18px; font-weight: 600; color: var(--ink); margin: 24px 0 12px; }
.page-content p { font-size: 16px; color: var(--body); line-height: 1.7; margin-bottom: 18px; max-width: 720px; }
.page-content ul { padding-left: 24px; margin-bottom: 18px; max-width: 720px; }
.page-content li { font-size: 16px; color: var(--body); line-height: 1.7; margin-bottom: 6px; }
.page-content a { color: var(--ink); border-bottom: 1px solid var(--hairline-strong); }
.page-content a:hover { color: var(--primary); }

.site-footer { background: var(--canvas); border-top: 1px solid var(--hairline); padding: 48px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
.footer-brand p { font-size: 14px; color: var(--body); line-height: 1.6; margin-top: 12px; max-width: 260px; }
.footer-col h4 { font-size: 11px; font-weight: 600; color: var(--ink); letter-spacing: 0.88px; text-transform: uppercase; margin-bottom: 16px; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 14px; color: var(--body); transition: color 0.15s; }
.footer-col a:hover { color: var(--ink); }
.footer-bottom { border-top: 1px solid var(--hairline); padding-top: 24px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-bottom p { font-size: 14px; color: var(--muted); }
.footer-disclaimer { font-size: 13px; color: var(--muted-soft); margin-top: 16px; line-height: 1.6; max-width: 800px; }

#cookie-banner {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  border-radius: 12px;
  padding: 20px 24px;
  max-width: 600px;
  width: calc(100% - 48px);
  z-index: 9999;
  display: none;
  align-items: flex-start;
  gap: 20px;
}
#cookie-banner.visible { display: flex; }
#cookie-banner p { font-size: 14px; color: var(--canvas-soft); line-height: 1.5; flex: 1; }
#cookie-banner p a { color: var(--canvas); border-bottom: 1px solid rgba(247,247,244,0.3); }
.cookie-actions { display: flex; gap: 8px; flex-shrink: 0; padding-top: 2px; }
.cookie-accept {
  background: var(--primary);
  color: var(--on-primary);
  border: none;
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
}
.cookie-reject {
  background: transparent;
  color: var(--canvas-soft);
  border: 1px solid rgba(247,247,244,0.3);
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
}

.info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 32px 0; }
.info-card { background: var(--card); border: 1px solid var(--hairline); border-radius: 12px; padding: 24px; }
.info-card-icon { width: 40px; height: 40px; background: var(--surface-strong); border-radius: 8px; display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.info-card h3 { font-size: 16px; font-weight: 600; color: var(--ink); margin-bottom: 8px; }
.info-card p { font-size: 14px; color: var(--body); line-height: 1.6; }

.breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 16px; }
.breadcrumb a { color: var(--muted); border-bottom: 1px solid var(--hairline); }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb span { margin: 0 6px; }

@media (max-width: 1024px) {
  .hero h1 { font-size: 56px; letter-spacing: -1.5px; }
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .info-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.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: 0;
  }
  .nav-links.open li a { display: block; padding: 12px 0; font-size: 16px; border-bottom: 1px solid var(--hairline-soft); }
  .nav-hamburger { display: flex; }
  .hero h1 { font-size: 36px; letter-spacing: -1px; }
  .hero { padding: 48px 0; }
  .section { padding: 48px 0; }
  .section-title { font-size: 26px; }
  .articles-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .article-header h1 { font-size: 32px; letter-spacing: -0.5px; }
  .page-header h1 { font-size: 32px; letter-spacing: -0.5px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .info-grid { grid-template-columns: 1fr; }
  #cookie-banner { flex-direction: column; }
  .cookie-actions { align-self: flex-end; }
}

@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .hero h1 { font-size: 28px; }
  .contact-form { padding: 20px 16px; }
  .article-header h1 { font-size: 26px; }
}