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

:root {
  --canvas: #f7f7f4;
  --canvas-soft: #fafaf7;
  --surface-card: #ffffff;
  --surface-strong: #e6e5e0;
  --primary: #f54e00;
  --primary-active: #d04200;
  --ink: #26251e;
  --body: #5a5852;
  --body-strong: #26251e;
  --muted: #807d72;
  --muted-soft: #a09c92;
  --on-primary: #ffffff;
  --hairline: #e6e5e0;
  --hairline-soft: #efeee8;
  --hairline-strong: #cfcdc4;
  --semantic-success: #1f8a65;
  --semantic-error: #cf2d56;
  --font-sans: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--body);
  background: var(--canvas);
}

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

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.nav-brand:hover { color: var(--primary); }

.nav-menu {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-menu a {
  font-size: 14px;
  font-weight: 500;
  color: var(--body);
  line-height: 1.4;
  transition: color 0.15s;
}

.nav-menu a:hover { color: var(--ink); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: all 0.2s;
}

.hero {
  background: var(--canvas);
  padding: 80px 0;
  border-bottom: 1px solid var(--hairline);
}

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

.hero-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--surface-strong);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 72px;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -2.16px;
  color: var(--ink);
  max-width: 780px;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 16px;
  color: var(--body);
  line-height: 1.5;
  max-width: 560px;
  margin-bottom: 16px;
}

.hero-meta {
  font-size: 13px;
  color: var(--muted);
}

.section { padding: 80px 0; }

.section-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

.section-heading {
  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;
  line-height: 1.5;
  margin-bottom: 48px;
}

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

.article-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  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;
}

.article-card-body { padding: 24px; }

.article-card-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

.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-card-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  border-bottom: 1px solid var(--hairline-strong);
  padding-bottom: 1px;
  transition: color 0.15s, border-color 0.15s;
}

.article-card-link:hover { color: var(--primary); border-color: var(--primary); }

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

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

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

.feature-card-icon {
  width: 40px;
  height: 40px;
  background: var(--surface-strong);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 18px;
}

.feature-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--body);
  line-height: 1.5;
}

.contact-section {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-info h2 {
  font-size: 36px;
  font-weight: 400;
  letter-spacing: -0.72px;
  color: var(--ink);
  margin-bottom: 16px;
}

.contact-info p {
  font-size: 16px;
  color: var(--body);
  line-height: 1.5;
  margin-bottom: 24px;
}

.contact-detail {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 6px;
}

.contact-form { display: flex; flex-direction: column; gap: 16px; }

.form-group { display: flex; flex-direction: column; gap: 6px; }

.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.1px;
}

.form-group input,
.form-group textarea {
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 16px;
  font-family: var(--font-sans);
  color: var(--ink);
  height: 44px;
  transition: border-color 0.15s;
  outline: none;
}

.form-group textarea {
  height: auto;
  resize: vertical;
  min-height: 100px;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--ink);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--muted-soft);
}

.form-error {
  font-size: 12px;
  color: var(--semantic-error);
  display: none;
}

.form-error.visible { display: block; }

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-sans);
  padding: 10px 18px;
  height: 40px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-primary:hover { background: var(--primary-active); }

.btn-secondary {
  background: var(--surface-card);
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-sans);
  padding: 10px 18px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hairline-strong);
  cursor: pointer;
  transition: background 0.15s;
}

.btn-secondary:hover { background: var(--surface-strong); }

.form-status {
  font-size: 14px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  display: none;
}

.form-status.success {
  display: block;
  background: #e8f5f0;
  color: var(--semantic-success);
  border: 1px solid #b6e0d0;
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: var(--on-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: none;
}

.spinner.visible { display: inline-block; }

@keyframes spin { to { transform: rotate(360deg); } }

.article-hero {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--hairline);
}

.article-breadcrumb {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 24px;
}

.article-breadcrumb a { color: var(--muted); }
.article-breadcrumb a:hover { color: var(--ink); }
.article-breadcrumb span { margin: 0 6px; }

.article-hero h1 {
  font-size: 48px;
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -1.2px;
  color: var(--ink);
  max-width: 760px;
  margin-bottom: 20px;
}

.article-hero-meta {
  font-size: 13px;
  color: var(--muted);
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 64px;
  padding: 48px 0 80px;
  align-items: start;
}

.article-body h2 {
  font-size: 26px;
  font-weight: 400;
  letter-spacing: -0.325px;
  color: var(--ink);
  margin: 40px 0 16px;
  line-height: 1.25;
}

.article-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin: 28px 0 12px;
}

.article-body p {
  font-size: 16px;
  color: var(--body);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  padding-left: 20px;
  margin-bottom: 20px;
}

.article-body li {
  font-size: 16px;
  color: var(--body);
  line-height: 1.6;
  margin-bottom: 6px;
}

.article-body a { color: var(--ink); border-bottom: 1px solid var(--hairline-strong); }
.article-body a:hover { color: var(--primary); border-color: var(--primary); }

.article-body img {
  width: 100%;
  border-radius: var(--radius-lg);
  margin: 32px 0;
  border: 1px solid var(--hairline);
}

.article-body figcaption {
  font-size: 13px;
  color: var(--muted);
  margin-top: -24px;
  margin-bottom: 32px;
  padding: 0 8px;
}

.article-body .tip-box {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 28px 0;
}

.article-body .tip-box strong {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}

.article-body .tip-box p { margin-bottom: 0; }

.article-sidebar { position: sticky; top: 88px; }

.sidebar-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
}

.sidebar-card h4 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

.sidebar-card ul { list-style: none; }

.sidebar-card li {
  font-size: 14px;
  color: var(--body);
  padding: 8px 0;
  border-bottom: 1px solid var(--hairline-soft);
}

.sidebar-card li:last-child { border-bottom: none; }

.sidebar-card li a { color: var(--body); font-size: 14px; }
.sidebar-card li a:hover { color: var(--ink); }

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

.page-hero {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--hairline);
}

.page-hero h1 {
  font-size: 48px;
  font-weight: 400;
  letter-spacing: -1.2px;
  color: var(--ink);
  line-height: 1.15;
  margin-bottom: 16px;
}

.page-hero p {
  font-size: 16px;
  color: var(--body);
  max-width: 560px;
}

.page-content {
  max-width: 720px;
  padding: 48px 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 10px;
}

.page-content p {
  font-size: 16px;
  color: var(--body);
  line-height: 1.6;
  margin-bottom: 18px;
}

.page-content ul, .page-content ol {
  padding-left: 20px;
  margin-bottom: 18px;
}

.page-content li {
  font-size: 16px;
  color: var(--body);
  line-height: 1.6;
  margin-bottom: 6px;
}

.page-content a { color: var(--ink); border-bottom: 1px solid var(--hairline-strong); }
.page-content a:hover { color: var(--primary); }

.page-updated {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 32px;
}

.site-footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding: 64px 0 0;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-logo {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  display: block;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.5;
}

.footer-col strong {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 16px;
}

.footer-col ul { list-style: none; }

.footer-col li { margin-bottom: 8px; }

.footer-col a {
  font-size: 14px;
  color: var(--body);
}

.footer-col a:hover { color: var(--ink); }

.footer-bottom {
  border-top: 1px solid var(--hairline);
  padding: 20px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--muted);
}

.footer-bottom a { color: var(--muted); }
.footer-bottom a:hover { color: var(--ink); }

.cookie-banner {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--canvas);
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  max-width: 540px;
  width: calc(100% - 48px);
  z-index: 200;
  display: none;
  box-shadow: 0 4px 24px rgba(38,37,30,0.18);
}

.cookie-banner.visible { display: block; }

.cookie-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.cookie-inner p {
  font-size: 14px;
  color: var(--canvas);
  flex: 1;
  min-width: 200px;
}

.cookie-inner a { color: var(--canvas-soft); border-bottom: 1px solid rgba(250,250,247,0.4); }

.cookie-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.cookie-actions .btn-primary {
  height: 36px;
  padding: 8px 16px;
  font-size: 13px;
}

.cookie-actions .btn-secondary {
  height: 36px;
  padding: 8px 16px;
  font-size: 13px;
  background: transparent;
  border-color: rgba(230,229,224,0.4);
  color: var(--canvas);
}

.cookie-actions .btn-secondary:hover {
  background: rgba(255,255,255,0.08);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
  padding: 48px 0 80px;
}

.about-text h2 {
  font-size: 26px;
  font-weight: 400;
  letter-spacing: -0.325px;
  color: var(--ink);
  margin: 32px 0 14px;
}

.about-text p {
  font-size: 16px;
  color: var(--body);
  line-height: 1.6;
  margin-bottom: 18px;
}

.about-image img {
  border-radius: var(--radius-lg);
  border: 1px solid var(--hairline);
  width: 100%;
}

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

@media (max-width: 1024px) {
  .hero h1 { font-size: 56px; letter-spacing: -1.5px; }
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; gap: 32px; }
  .article-sidebar { position: static; }
  .related-articles-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    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-menu.open { display: flex; }
  .nav-menu li { border-bottom: 1px solid var(--hairline-soft); }
  .nav-menu li:last-child { border-bottom: none; }
  .nav-menu a { display: block; padding: 12px 0; font-size: 16px; }
  .nav-toggle { display: flex; }
  .site-nav { position: relative; }

  .hero { padding: 48px 0; }
  .hero h1 { font-size: 36px; letter-spacing: -0.72px; }
  .section { padding: 48px 0; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .articles-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .related-articles-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .article-hero h1 { font-size: 32px; }
  .page-hero h1 { font-size: 36px; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 28px; letter-spacing: -0.5px; }
}