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

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

  --font-sans: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --rounded-none: 0px;
  --rounded-xs: 4px;
  --rounded-sm: 6px;
  --rounded-md: 8px;
  --rounded-lg: 12px;
  --rounded-xl: 16px;
  --rounded-pill: 9999px;

  --sp-xxs: 4px;
  --sp-xs: 8px;
  --sp-sm: 12px;
  --sp-base: 16px;
  --sp-md: 20px;
  --sp-lg: 24px;
  --sp-xl: 32px;
  --sp-xxl: 48px;
  --sp-section: 80px;
}

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

html { scroll-behavior: smooth; }

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

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--sp-lg);
}

.section {
  padding: var(--sp-section) 0;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-ink);
  font-weight: 400;
  line-height: 1.2;
}

h1 { font-size: 2.25rem; letter-spacing: -0.045em; }
h2 { font-size: 2rem; letter-spacing: -0.02em; }
h3 { font-size: 1.625rem; letter-spacing: -0.013em; }
h4 { font-size: 1.375rem; letter-spacing: -0.007em; }
h5 { font-size: 1.125rem; font-weight: 600; }
h6 { font-size: 1rem; font-weight: 600; }

p { margin-bottom: var(--sp-base); color: var(--color-body); }
p:last-child { margin-bottom: 0; }

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

.top-nav .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-xl);
  list-style: none;
}

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

.nav-links a:hover { color: var(--color-ink); text-decoration: none; }

.nav-links a.active { color: var(--color-ink); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--sp-xs);
  background: none;
  border: none;
}

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

.hero-band {
  padding: var(--sp-section) 0 60px;
  background: var(--color-canvas);
}

.hero-band h1 {
  font-size: clamp(2rem, 5vw, 4.5rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--color-ink);
  margin-bottom: var(--sp-lg);
  max-width: 800px;
}

.hero-band .hero-sub {
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-body);
  max-width: 560px;
  margin-bottom: var(--sp-xl);
}

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

.hero-image {
  margin-top: var(--sp-xxl);
  border-radius: var(--rounded-lg);
  overflow: hidden;
  border: 1px solid var(--color-hairline);
}

.hero-image img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-lg);
}

.article-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-lg);
  overflow: hidden;
  transition: border-color 0.15s;
}

.article-card:hover { border-color: var(--color-hairline-strong); text-decoration: none; }

.article-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.article-card-body {
  padding: var(--sp-lg);
}

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

.article-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--sp-xs);
  line-height: 1.35;
}

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

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

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-lg);
}

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

.feature-card h5 {
  color: var(--color-ink);
  margin-bottom: var(--sp-xs);
}

.feature-card p { font-size: 14px; margin-bottom: 0; }

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

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin-bottom: var(--sp-md);
}

.section-sub {
  font-size: 16px;
  color: var(--color-body);
  max-width: 560px;
  margin-bottom: var(--sp-xxl);
}

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

.band-soft {
  background: var(--color-canvas-soft);
  border-top: 1px solid var(--color-hairline-soft);
  border-bottom: 1px solid var(--color-hairline-soft);
}

.contact-form {
  background: var(--color-surface-card);
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-lg);
  padding: var(--sp-xxl);
  max-width: 560px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--sp-lg);
}

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

.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--color-surface-card);
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--rounded-md);
  padding: 12px 16px;
  font-size: 16px;
  font-family: var(--font-sans);
  color: var(--color-ink);
  height: 44px;
  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(--color-ink);
}

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

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

.btn-primary:hover { background: var(--color-primary-active); text-decoration: none; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-card);
  color: var(--color-ink);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 18px;
  height: 40px;
  border-radius: var(--rounded-md);
  border: 1px solid var(--color-hairline-strong);
  cursor: pointer;
  transition: border-color 0.15s;
}

.btn-secondary:hover { border-color: var(--color-ink); text-decoration: none; }

.form-status {
  display: none;
  padding: var(--sp-sm) var(--sp-base);
  border-radius: var(--rounded-md);
  font-size: 14px;
  margin-top: var(--sp-sm);
}

.form-status.success {
  background: #edf7f3;
  color: var(--color-success);
  border: 1px solid #b3dece;
  display: block;
}

.form-status.loading {
  background: var(--color-canvas-soft);
  color: var(--color-muted);
  border: 1px solid var(--color-hairline);
  display: block;
}

.site-footer {
  background: var(--color-canvas);
  border-top: 1px solid var(--color-hairline);
  padding: 64px 0 48px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: var(--sp-xl);
  margin-bottom: var(--sp-xxl);
}

.footer-brand p {
  font-size: 14px;
  color: var(--color-muted);
  margin-top: var(--sp-sm);
  max-width: 240px;
}

.footer-col h6 {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--sp-sm);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: var(--sp-xs); }
.footer-col ul li a { font-size: 14px; color: var(--color-body); transition: color 0.15s; }
.footer-col ul li a:hover { color: var(--color-ink); text-decoration: none; }

.footer-bottom {
  border-top: 1px solid var(--color-hairline);
  padding-top: var(--sp-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-bottom p { font-size: 13px; color: var(--color-muted); margin: 0; }

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-surface-card);
  border-top: 1px solid var(--color-hairline-strong);
  padding: var(--sp-lg) var(--sp-lg);
  z-index: 200;
  display: none;
}

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

.cookie-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--sp-xl);
  flex-wrap: wrap;
}

.cookie-text { font-size: 14px; color: var(--color-body); flex: 1; min-width: 240px; }
.cookie-text a { color: var(--color-ink); text-decoration: underline; }

.cookie-actions { display: flex; gap: var(--sp-sm); flex-shrink: 0; }

.article-page-header {
  padding: var(--sp-xxl) 0 var(--sp-xl);
  border-bottom: 1px solid var(--color-hairline);
  margin-bottom: var(--sp-xxl);
}

.article-page-header .badge-pill { margin-bottom: var(--sp-md); }

.article-page-header h1 {
  font-size: clamp(1.75rem, 4vw, 3rem);
  letter-spacing: -0.025em;
  max-width: 720px;
  margin-bottom: var(--sp-md);
}

.article-page-header .article-meta {
  font-size: 14px;
  color: var(--color-muted);
  display: flex;
  gap: var(--sp-md);
  flex-wrap: wrap;
}

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

.article-content h2 {
  font-size: 1.5rem;
  letter-spacing: -0.015em;
  margin-top: var(--sp-xxl);
  margin-bottom: var(--sp-md);
  color: var(--color-ink);
}

.article-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: var(--sp-xl);
  margin-bottom: var(--sp-sm);
  color: var(--color-ink);
}

.article-content p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-body);
  margin-bottom: var(--sp-lg);
}

.article-content ul, .article-content ol {
  padding-left: var(--sp-xl);
  margin-bottom: var(--sp-lg);
  color: var(--color-body);
}

.article-content li { margin-bottom: var(--sp-xs); line-height: 1.65; }

.article-content img {
  border-radius: var(--rounded-lg);
  border: 1px solid var(--color-hairline);
  margin: var(--sp-xl) 0;
}

.article-content figcaption {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: var(--sp-xs);
}

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

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

.sidebar-card h6 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: var(--sp-sm);
}

.sidebar-card ul { list-style: none; }
.sidebar-card ul li { margin-bottom: var(--sp-xs); }
.sidebar-card ul li a { font-size: 14px; color: var(--color-body); }
.sidebar-card ul li a:hover { color: var(--color-ink); text-decoration: none; }

.page-header {
  padding: var(--sp-xxl) 0;
  border-bottom: 1px solid var(--color-hairline);
  margin-bottom: var(--sp-xxl);
}

.page-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  letter-spacing: -0.02em;
}

.page-header p { font-size: 16px; color: var(--color-muted); margin-top: var(--sp-sm); margin-bottom: 0; }

.prose h2 {
  font-size: 1.375rem;
  letter-spacing: -0.01em;
  color: var(--color-ink);
  margin-top: var(--sp-xxl);
  margin-bottom: var(--sp-md);
}

.prose p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-body);
  margin-bottom: var(--sp-lg);
}

.prose ul, .prose ol {
  padding-left: var(--sp-xl);
  margin-bottom: var(--sp-lg);
  color: var(--color-body);
}

.prose li { margin-bottom: var(--sp-xs); line-height: 1.65; }

.prose a { color: var(--color-ink); text-decoration: underline; }

.info-box {
  background: var(--color-canvas-soft);
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-lg);
  padding: var(--sp-lg);
  margin: var(--sp-xl) 0;
}

.info-box p { margin: 0; font-size: 14px; }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-lg);
  margin: var(--sp-xxl) 0;
}

.stat-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-lg);
  padding: var(--sp-lg);
  text-align: center;
}

.stat-card .stat-num {
  font-size: 2rem;
  font-weight: 400;
  color: var(--color-ink);
  letter-spacing: -0.025em;
  display: block;
}

.stat-card .stat-label { font-size: 13px; color: var(--color-muted); margin: 0; }

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--sp-xs);
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: var(--sp-lg);
  flex-wrap: wrap;
}

.breadcrumb a { color: var(--color-muted); }
.breadcrumb a:hover { color: var(--color-ink); text-decoration: none; }
.breadcrumb .sep { color: var(--color-hairline-strong); }

@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    gap: var(--sp-md);
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-canvas);
    border-bottom: 1px solid var(--color-hairline);
    padding: var(--sp-lg) var(--sp-lg);
  }
  .nav-toggle { display: flex; }
  .top-nav { position: relative; }
  .article-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; gap: var(--sp-sm); text-align: center; }
  .contact-form { padding: var(--sp-lg); }
  .cookie-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; }
}