: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;
  --success: #1f8a65;
  --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;
}

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

html { scroll-behavior: smooth; }

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

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

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

ul, ol { list-style: none; }

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

.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; align-items: center; gap: 8px; }

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

.nav-logo-text span { color: var(--primary); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--body);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background 0.15s;
}

.nav-link:hover { color: var(--ink); background: var(--surface-strong); }
.nav-link.active { color: var(--ink); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

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

.hero-band {
  padding: 80px 24px;
  background: var(--canvas);
}

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

.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-title {
  font-size: 56px;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -1.5px;
  color: var(--ink);
  max-width: 800px;
  margin-bottom: 24px;
}

.hero-title em { font-style: normal; color: var(--primary); }

.hero-subtitle {
  font-size: 18px;
  color: var(--body);
  max-width: 560px;
  line-height: 1.6;
  margin-bottom: 40px;
}

.hero-image-wrap {
  margin-top: 56px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface-card);
  max-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
}

.hero-image-wrap img {
  max-height: 316px;
  width: auto;
  object-fit: contain;
}

.section { padding: 80px 0; }
.section-alt { background: var(--canvas-soft); }

.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;
  letter-spacing: -0.72px;
  color: var(--ink);
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--body);
  max-width: 560px;
  line-height: 1.6;
  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-image {
  height: 180px;
  overflow: hidden;
  background: var(--canvas-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.article-card-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

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

.article-card-category {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

.article-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.3;
  margin-bottom: 12px;
}

.article-card-excerpt {
  font-size: 14px;
  color: var(--body);
  line-height: 1.5;
  margin-bottom: 20px;
}

.article-card-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

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

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

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

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

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

.contact-section { padding: 80px 0; }

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

.contact-info-title {
  font-size: 26px;
  font-weight: 400;
  letter-spacing: -0.325px;
  color: var(--ink);
  margin-bottom: 16px;
}

.contact-info-text {
  font-size: 16px;
  color: var(--body);
  line-height: 1.6;
  margin-bottom: 32px;
}

.contact-detail {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-detail-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 14px;
  color: var(--body);
}

.contact-detail-item strong { color: var(--ink); font-weight: 600; }

.contact-form { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: 32px; }

.form-group { margin-bottom: 20px; }

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

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

.form-input:focus { border-color: var(--ink); }
.form-input.error { border-color: var(--error); }

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

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary);
  color: var(--on-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 18px;
  height: 40px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background 0.15s;
  text-decoration: none;
}

.btn-primary:hover { background: var(--primary-active); color: var(--on-primary); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-card);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 18px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hairline-strong);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  text-decoration: none;
}

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

.form-submit { width: 100%; height: 44px; font-size: 15px; margin-top: 8px; }

.form-notice {
  display: none;
  padding: 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  margin-top: 16px;
  text-align: center;
}

.form-notice.success { display: block; background: #d4f0e6; color: var(--success); border: 1px solid #a3dcc7; }
.form-notice.error-state { display: block; background: #fde8ed; color: var(--error); border: 1px solid #f4aabf; }

.article-page { padding: 48px 0 80px; }

.article-breadcrumb {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-breadcrumb a { color: var(--muted); }
.article-breadcrumb a:hover { color: var(--ink); }
.article-breadcrumb span { color: var(--muted-soft); }

.article-header { margin-bottom: 40px; }

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.article-category {
  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);
}

.article-date { font-size: 13px; color: var(--muted); }

.article-title {
  font-size: 40px;
  font-weight: 400;
  letter-spacing: -1px;
  color: var(--ink);
  line-height: 1.15;
  margin-bottom: 20px;
  max-width: 800px;
}

.article-lead {
  font-size: 18px;
  color: var(--body);
  line-height: 1.6;
  max-width: 700px;
  margin-bottom: 32px;
}

.article-image-main {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface-card);
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 48px;
  max-height: 400px;
}

.article-image-main img {
  max-height: 336px;
  width: auto;
  object-fit: contain;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 64px;
  align-items: start;
}

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

.article-content h2:first-child { margin-top: 0; }

.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
  margin: 28px 0 12px;
}

.article-content p {
  font-size: 16px;
  color: var(--body);
  line-height: 1.65;
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 20px;
}

.article-content ol { list-style: decimal; }

.article-content li {
  font-size: 16px;
  color: var(--body);
  line-height: 1.65;
  margin-bottom: 8px;
}

.article-content strong { color: var(--ink); font-weight: 600; }

.article-content a { color: var(--primary); text-decoration: underline; }
.article-content a:hover { color: var(--primary-active); }

.article-content code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  color: var(--ink);
}

.article-content pre {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 20px;
  overflow-x: auto;
  margin-bottom: 24px;
}

.article-content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 13px;
  line-height: 1.5;
}

.info-box {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin: 24px 0;
}

.info-box p { margin-bottom: 0; }

.article-sidebar { position: sticky; top: 80px; }

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

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

.toc-list { display: flex; flex-direction: column; gap: 8px; }

.toc-list a {
  font-size: 14px;
  color: var(--body);
  line-height: 1.4;
  transition: color 0.15s;
}

.toc-list a:hover { color: var(--ink); }

.related-list { display: flex; flex-direction: column; gap: 12px; }

.related-item a {
  font-size: 14px;
  color: var(--body);
  line-height: 1.4;
}

.related-item a:hover { color: var(--ink); }

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

.page-title {
  font-size: 40px;
  font-weight: 400;
  letter-spacing: -1px;
  color: var(--ink);
  margin-bottom: 16px;
}

.page-lead {
  font-size: 18px;
  color: var(--body);
  max-width: 600px;
  line-height: 1.6;
}

.page-content { padding: 48px 0 80px; max-width: 760px; }

.page-content h2 {
  font-size: 26px;
  font-weight: 400;
  letter-spacing: -0.325px;
  color: var(--ink);
  margin: 40px 0 16px;
}

.page-content h2:first-child { margin-top: 0; }
.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: 1.65;
  margin-bottom: 20px;
}

.page-content ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 20px;
}

.page-content li { font-size: 16px; color: var(--body); line-height: 1.65; margin-bottom: 6px; }

.page-updated {
  font-size: 13px;
  color: var(--muted);
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline-soft);
}

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

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-logo {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.02em;
  display: block;
  margin-bottom: 12px;
}

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

.footer-heading {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.footer-links { display: flex; flex-direction: column; gap: 10px; }

.footer-links a {
  font-size: 14px;
  color: var(--body);
  transition: color 0.15s;
}

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--hairline-soft);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-copy, .footer-disclaimer { font-size: 13px; color: var(--muted); }

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--ink);
  color: var(--canvas);
  padding: 20px 24px;
  z-index: 200;
  display: none;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.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-text strong {
  font-size: 14px;
  font-weight: 600;
  color: var(--canvas);
  display: block;
  margin-bottom: 4px;
}

.cookie-text p { font-size: 13px; color: var(--muted-soft); }
.cookie-text a { color: var(--canvas); text-decoration: underline; }

.cookie-actions { display: flex; gap: 12px; flex-shrink: 0; }

.cookie-banner .btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  height: 36px;
  font-size: 13px;
}

.cookie-banner .btn-secondary {
  background: transparent;
  color: var(--canvas);
  border-color: rgba(255,255,255,0.3);
  height: 36px;
  font-size: 13px;
}

.cookie-banner .btn-secondary:hover {
  background: rgba(255,255,255,0.08);
  color: var(--canvas);
}

@media (max-width: 1024px) {
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 44px; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 2px;
  }
  .nav-menu.open { display: flex; }
  .nav-link { padding: 10px 12px; }
  .site-nav { position: relative; }
  .hero-band { padding: 48px 24px; }
  .hero-title { font-size: 32px; letter-spacing: -0.8px; }
  .hero-subtitle { font-size: 16px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 28px; }
  .articles-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 8px; }
  .article-title { font-size: 28px; }
  .page-title { font-size: 28px; }
  .cookie-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  .hero-title { font-size: 28px; }
  .contact-form { padding: 20px; }
}