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

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

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--canvas);
  color: var(--body);
  font-family: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-weight: 400;
  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; }

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

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

h1, h2, h3, h4 {
  color: var(--ink);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h1 { font-size: 48px; letter-spacing: -0.045em; }
h2 { font-size: 36px; letter-spacing: -0.02em; }
h3 { font-size: 26px; letter-spacing: -0.0125em; }
h4 { font-size: 22px; letter-spacing: -0.005em; }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

.text-muted { color: var(--muted); }
.text-body { color: var(--body); }

.label-upper {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.088em;
  text-transform: uppercase;
  color: var(--muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  padding: 10px 18px;
  height: 40px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease;
  text-decoration: none;
}

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

.btn-secondary {
  background: var(--card);
  color: var(--ink);
  border: 1px solid var(--hairline-strong);
}
.btn-secondary:hover { background: var(--canvas); color: var(--ink); }

.btn-ink {
  background: var(--ink);
  color: var(--canvas);
  padding: 12px 20px;
  height: 44px;
}
.btn-ink:hover { background: #3a3930; color: var(--canvas); }

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

.badge {
  display: inline-block;
  background: var(--surface-strong);
  color: var(--ink);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.088em;
  text-transform: uppercase;
  border-radius: 9999px;
  padding: 4px 10px;
}

.divider {
  border: none;
  border-top: 1px solid var(--hairline);
  margin: 40px 0;
}

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

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

.nav-brand {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.02em;
  text-decoration: none;
}

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

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

.hero-inner {
  max-width: 720px;
}

.hero h1 {
  font-size: 56px;
  margin-bottom: 20px;
  line-height: 1.1;
}

.hero p {
  font-size: 18px;
  color: var(--body);
  margin-bottom: 32px;
  line-height: 1.6;
}

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

.article-card {
  background: var(--card);
  border-radius: 12px;
  border: 1px solid var(--hairline);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s;
}

.article-card:hover { border-color: var(--hairline-strong); }

.article-card-img {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--surface-strong);
}

.article-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.article-card:hover .article-card-img img { transform: scale(1.03); }

.article-card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-card-body .badge { margin-bottom: 12px; }

.article-card-body h3 {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--ink);
}

.article-card-body p {
  font-size: 14px;
  color: var(--body);
  line-height: 1.55;
  flex: 1;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--hairline-soft);
}

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

.article-card-meta a {
  font-size: 13px;
  font-weight: 500;
  color: var(--primary);
}

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

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

.feature-card {
  background: var(--card);
  border-radius: 12px;
  border: 1px solid var(--hairline);
  padding: 28px;
}

.feature-card-icon {
  width: 44px;
  height: 44px;
  background: var(--canvas);
  border-radius: 10px;
  border: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 22px;
}

.feature-card h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--ink);
}

.feature-card p {
  font-size: 15px;
  color: var(--body);
  margin: 0;
}

.article-hero {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--hairline);
}

.article-hero .label-upper { margin-bottom: 16px; }

.article-hero h1 {
  font-size: 44px;
  max-width: 780px;
  margin-bottom: 20px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
  color: var(--muted);
  flex-wrap: wrap;
}

.article-meta span { display: flex; align-items: center; gap: 6px; }

.article-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 56px;
  align-items: start;
  padding: 56px 0 80px;
}

.article-content h2 {
  font-size: 28px;
  margin: 40px 0 16px;
  color: var(--ink);
}

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

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

.article-content p {
  font-size: 16px;
  color: var(--body);
  line-height: 1.7;
  margin-bottom: 1.2rem;
}

.article-content ul, .article-content ol {
  margin: 0 0 1.2rem 1.4rem;
  color: var(--body);
  font-size: 16px;
  line-height: 1.7;
}

.article-content li { margin-bottom: 6px; }

.article-content .info-box {
  background: var(--card);
  border-radius: 12px;
  border: 1px solid var(--hairline);
  padding: 24px 28px;
  margin: 32px 0;
}

.article-content .info-box .label-upper { margin-bottom: 10px; }

.article-content .info-box p { margin: 0; font-size: 15px; }

.article-img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--hairline);
  overflow: hidden;
  margin: 32px 0;
}

.article-img img { width: 100%; display: block; }

.article-img figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--muted);
  border-top: 1px solid var(--hairline-soft);
  background: var(--card);
}

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

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

.sidebar-card h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--ink);
}

.toc-list { list-style: none; padding: 0; }

.toc-list li { padding: 6px 0; border-bottom: 1px solid var(--hairline-soft); }
.toc-list li:last-child { border-bottom: none; }
.toc-list a { font-size: 14px; color: var(--body); }
.toc-list a:hover { color: var(--primary); }

.related-list { list-style: none; padding: 0; }
.related-list li { padding: 8px 0; border-bottom: 1px solid var(--hairline-soft); }
.related-list li:last-child { border-bottom: none; }
.related-list a { font-size: 14px; color: var(--body); line-height: 1.4; }
.related-list a:hover { color: var(--primary); }

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

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.contact-info h2 { margin-bottom: 16px; }
.contact-info p { font-size: 16px; color: var(--body); margin-bottom: 24px; }

.contact-detail {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.contact-detail-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 18px;
  background: var(--card);
  border-radius: 10px;
  border: 1px solid var(--hairline);
}

.contact-detail-item strong {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.contact-detail-item span { font-size: 15px; color: var(--body); }

.form-card {
  background: var(--card);
  border-radius: 12px;
  border: 1px solid var(--hairline);
  padding: 32px;
}

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

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

.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--canvas);
  border: 1px solid var(--hairline-strong);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 15px;
  color: var(--ink);
  font-family: inherit;
  transition: border-color 0.15s;
  outline: none;
  height: 44px;
}

.form-group textarea {
  height: auto;
  min-height: 110px;
  resize: vertical;
}

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

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

.form-error {
  font-size: 12px;
  color: var(--error);
  margin-top: 4px;
}

.form-success {
  display: none;
  background: #f0faf6;
  border: 1px solid #9fc9a2;
  border-radius: 8px;
  padding: 16px 20px;
  font-size: 15px;
  color: var(--success);
  margin-top: 16px;
}

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

.site-footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding: 56px 0 40px;
}

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

.footer-brand h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.footer-brand h3 span { color: var(--primary); }

.footer-brand p {
  font-size: 14px;
  color: var(--body);
  line-height: 1.6;
  margin: 0;
  max-width: 260px;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 14px;
}

.footer-col ul { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 8px; }

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

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

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

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

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

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

.page-hero {
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--hairline);
}

.page-hero .label-upper { margin-bottom: 16px; }

.page-hero h1 { font-size: 44px; max-width: 700px; margin-bottom: 16px; }

.page-hero p { font-size: 18px; color: var(--body); max-width: 620px; }

.page-content {
  padding: 56px 0 80px;
  max-width: 780px;
}

.page-content h2 { font-size: 26px; margin: 36px 0 14px; }
.page-content h2:first-child { margin-top: 0; }
.page-content h3 { font-size: 20px; margin: 24px 0 10px; }
.page-content p { font-size: 16px; color: var(--body); line-height: 1.7; }
.page-content ul, .page-content ol { margin: 0 0 1.2rem 1.5rem; color: var(--body); font-size: 16px; line-height: 1.7; }
.page-content li { margin-bottom: 6px; }

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
  padding: 18px 0;
  flex-wrap: wrap;
}

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

.cookie-banner {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 48px);
  max-width: 740px;
  background: var(--ink);
  color: var(--canvas);
  border-radius: 12px;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  z-index: 9999;
  box-shadow: 0 4px 24px rgba(38, 37, 30, 0.18);
  flex-wrap: wrap;
}

.cookie-banner p {
  font-size: 14px;
  color: #d4d3cc;
  margin: 0;
  flex: 1;
  min-width: 200px;
  line-height: 1.5;
}

.cookie-banner p a { color: var(--canvas); text-decoration: underline; }

.cookie-banner-actions { display: flex; gap: 10px; flex-shrink: 0; }

.cookie-btn {
  font-size: 13px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
}

.cookie-btn-accept {
  background: var(--primary);
  color: #fff;
}

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

.cookie-btn-reject {
  background: rgba(255,255,255,0.1);
  color: var(--canvas);
  border: 1px solid rgba(255,255,255,0.2);
}

.cookie-btn-reject:hover { background: rgba(255,255,255,0.18); }

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

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

.about-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 56px;
  align-items: start;
}

.about-facts {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about-fact {
  background: var(--card);
  border-radius: 12px;
  border: 1px solid var(--hairline);
  padding: 20px 24px;
}

.about-fact strong {
  display: block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  margin-bottom: 4px;
}

.about-fact p { font-size: 15px; color: var(--body); margin: 0; }

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0 32px;
  font-size: 15px;
}

.comparison-table th {
  text-align: left;
  padding: 12px 16px;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  border-bottom: 2px solid var(--hairline);
}

.comparison-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--hairline-soft);
  color: var(--body);
  vertical-align: top;
}

.comparison-table tr:last-child td { border-bottom: none; }

.comparison-table td:first-child { font-weight: 500; color: var(--ink); }

@media (max-width: 1024px) {
  h1 { font-size: 40px; }
  h2 { font-size: 30px; }
  .article-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; gap: 40px; }
  .sidebar { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: span 3; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-grid { grid-template-columns: 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 20px;
    gap: 16px;
  }
  .nav-toggle { display: flex; }
  .site-nav { position: relative; }
  .hero h1 { font-size: 36px; }
  .article-hero h1 { font-size: 32px; }
  .page-hero h1 { font-size: 32px; }
  .article-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: span 2; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  .section-pad { padding: 56px 0; }
  .hero { padding: 56px 0; }
  h1 { font-size: 32px; }
  h2 { font-size: 26px; }
  h3 { font-size: 22px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: span 1; }
  .cookie-banner { bottom: 16px; width: calc(100% - 32px); }
  .comparison-table { display: block; overflow-x: auto; }
  .form-card { padding: 24px 20px; }
}