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

*, *::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;
  --muted: #807d72;
  --muted-soft: #a09c92;
  --on-primary: #ffffff;
  --hairline: #e6e5e0;
  --hairline-soft: #efeee8;
  --hairline-strong: #cfcdc4;
  --success: #1f8a65;
  --error: #cf2d56;
}

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; }
a { color: inherit; text-decoration: none; }
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; height: 64px; display: flex; align-items: center; }
.site-nav .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.nav-logo { font-size: 18px; font-weight: 600; color: var(--ink); letter-spacing: -0.02em; }
.nav-logo span { color: var(--primary); }
.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--body); line-height: 1.4; 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); transition: 0.3s; }
.nav-mobile { display: none; position: fixed; top: 64px; left: 0; right: 0; bottom: 0; background: var(--canvas); z-index: 99; padding: 32px 24px; overflow-y: auto; }
.nav-mobile.open { display: block; }
.nav-mobile ul { list-style: none; }
.nav-mobile ul li { border-bottom: 1px solid var(--hairline); }
.nav-mobile ul a { display: block; padding: 16px 0; font-size: 18px; font-weight: 500; color: var(--ink); }

.hero { padding: 80px 0; }
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.hero-badge { display: inline-block; background: var(--surface-strong); color: var(--ink); font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; padding: 4px 10px; border-radius: 9999px; margin-bottom: 20px; }
.hero h1 { font-size: 52px; font-weight: 400; line-height: 1.1; letter-spacing: -1.5px; color: var(--ink); margin-bottom: 20px; }
.hero-desc { font-size: 16px; color: var(--body); line-height: 1.6; margin-bottom: 24px; max-width: 480px; }
.hero-meta { font-size: 13px; color: var(--muted); }
.hero-image { border-radius: 12px; overflow: hidden; border: 1px solid var(--hairline); background: var(--surface-card); }
.hero-image img { width: 100%; height: 340px; object-fit: cover; }

.section { padding: 80px 0; }
.section + .section { padding-top: 0; }
.section-label { display: inline-block; font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); margin-bottom: 12px; }
.section-title { font-size: 36px; font-weight: 400; letter-spacing: -0.72px; color: var(--ink); line-height: 1.2; margin-bottom: 16px; }
.section-desc { font-size: 16px; color: var(--body); max-width: 600px; line-height: 1.6; }
.section-header { margin-bottom: 48px; }

.cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: 12px; overflow: hidden; transition: border-color 0.15s; display: flex; flex-direction: column; }
.card:hover { border-color: var(--hairline-strong); }
.card-img { width: 100%; height: 200px; object-fit: cover; }
.card-body { padding: 24px; flex: 1; }
.card-tag { display: inline-block; font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.card-title { font-size: 18px; font-weight: 600; color: var(--ink); line-height: 1.35; margin-bottom: 10px; }
.card-excerpt { font-size: 14px; color: var(--body); line-height: 1.6; }
.card-footer { padding: 16px 24px; border-top: 1px solid var(--hairline-soft); display: flex; align-items: center; }
.card-date { font-size: 13px; color: var(--muted); }
.card-link { font-size: 13px; color: var(--primary); font-weight: 500; margin-left: auto; }
.card-link:hover { color: var(--primary-active); }

.article-header { padding: 64px 0 48px; }
.article-tag-pill { font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; display: block; }
.article-header h1 { font-size: 48px; font-weight: 400; letter-spacing: -1.2px; color: var(--ink); line-height: 1.1; margin-bottom: 20px; max-width: 820px; }
.article-meta { font-size: 14px; color: var(--muted); display: flex; gap: 20px; flex-wrap: wrap; }
.article-hero-img { border-radius: 12px; overflow: hidden; border: 1px solid var(--hairline); margin-bottom: 48px; }
.article-hero-img img { width: 100%; height: 400px; object-fit: cover; }
.article-layout { display: grid; grid-template-columns: 1fr 280px; gap: 48px; align-items: start; padding-bottom: 80px; }
.article-body h2 { font-size: 28px; font-weight: 400; letter-spacing: -0.5px; color: var(--ink); margin: 40px 0 16px; }
.article-body h3 { font-size: 20px; font-weight: 600; color: var(--ink); margin: 28px 0 12px; }
.article-body p { font-size: 16px; color: var(--body); line-height: 1.7; margin-bottom: 20px; }
.article-body ul, .article-body ol { padding-left: 24px; margin-bottom: 20px; }
.article-body li { font-size: 16px; color: var(--body); line-height: 1.7; margin-bottom: 8px; }
.article-body a { color: var(--primary); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.article-body a:hover { color: var(--primary-active); }
.article-body figure { margin: 32px 0; }
.article-body figure img { border-radius: 12px; border: 1px solid var(--hairline); width: 100%; max-height: 420px; object-fit: contain; background: var(--surface-card); padding: 20px; }
.article-body figcaption { font-size: 13px; color: var(--muted); margin-top: 10px; text-align: center; font-style: italic; }
.article-body blockquote { border-left: 3px solid var(--primary); margin: 32px 0; padding: 20px 24px; background: var(--surface-card); border-radius: 0 8px 8px 0; border-top: 1px solid var(--hairline); border-right: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.article-body blockquote p { font-size: 17px; color: var(--ink); margin: 0; font-style: italic; line-height: 1.6; }
.info-box { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: 12px; padding: 24px; margin: 32px 0; }
.info-box h4 { font-size: 13px; font-weight: 600; color: var(--ink); text-transform: uppercase; letter-spacing: 0.6px; margin-bottom: 14px; }
.info-box ul { padding-left: 18px; }
.info-box li { font-size: 14px; color: var(--body); line-height: 1.6; margin-bottom: 6px; }
.info-box p { font-size: 14px; color: var(--body); line-height: 1.6; margin-bottom: 8px; }

.article-sidebar { position: sticky; top: 88px; }
.sidebar-widget { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: 12px; padding: 24px; margin-bottom: 24px; }
.sidebar-widget h3 { font-size: 13px; font-weight: 600; color: var(--ink); text-transform: uppercase; letter-spacing: 0.6px; margin-bottom: 16px; }
.toc-list { list-style: none; }
.toc-list li { margin-bottom: 8px; }
.toc-list a { font-size: 14px; color: var(--body); padding: 4px 0; display: block; transition: color 0.15s; border-left: 2px solid transparent; padding-left: 10px; }
.toc-list a:hover { color: var(--ink); border-left-color: var(--primary); }
.related-list { list-style: none; }
.related-list li { padding: 10px 0; border-bottom: 1px solid var(--hairline-soft); }
.related-list li:last-child { border-bottom: none; padding-bottom: 0; }
.related-list a { font-size: 14px; color: var(--body); line-height: 1.5; display: block; transition: color 0.15s; }
.related-list a:hover { color: var(--ink); }

.contact-section { background: var(--surface-card); padding: 80px 0; border-top: 1px solid var(--hairline); border-bottom: 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); line-height: 1.2; margin-bottom: 16px; }
.contact-info p { font-size: 16px; color: var(--body); line-height: 1.6; margin-bottom: 24px; }
.contact-detail { font-size: 14px; color: var(--muted); display: flex; flex-direction: column; gap: 10px; }
.contact-detail strong { color: var(--body); font-weight: 500; }
.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(--canvas); color: var(--ink); border: 1px solid var(--hairline-strong); border-radius: 8px; padding: 12px 16px; font-size: 16px; font-family: inherit; height: 44px; transition: border-color 0.15s; outline: none; }
.form-group textarea { height: auto; min-height: 110px; resize: vertical; }
.form-group input:focus, .form-group textarea:focus { border-color: var(--ink); }
.form-group input.error-field { border-color: var(--error); }
.field-error { font-size: 12px; color: var(--error); margin-top: 5px; display: none; }
.field-error.show { display: block; }
.btn-submit { background: var(--primary); color: var(--on-primary); border: none; border-radius: 8px; padding: 10px 24px; font-size: 14px; font-weight: 500; cursor: pointer; height: 44px; transition: background 0.15s; display: inline-flex; align-items: center; gap: 8px; }
.btn-submit:hover { background: var(--primary-active); }
.btn-submit:disabled { opacity: 0.65; cursor: not-allowed; }
.form-success { display: none; background: #eaf5ee; color: var(--success); border: 1px solid #a8d8bb; border-radius: 8px; padding: 16px 20px; font-size: 14px; font-weight: 500; margin-top: 16px; }
.form-success.show { display: block; }
.spinner { width: 16px; height: 16px; border: 2px solid rgba(255,255,255,0.35); border-top-color: #fff; border-radius: 50%; animation: spin 0.6s linear infinite; flex-shrink: 0; }
@keyframes spin { to { transform: rotate(360deg); } }

.cookie-banner { position: fixed; bottom: 0; left: 0; right: 0; background: var(--ink); z-index: 1000; padding: 20px 0; transform: translateY(100%); transition: transform 0.3s ease; }
.cookie-banner.visible { transform: translateY(0); }
.cookie-inner { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.cookie-text { font-size: 14px; color: rgba(247,247,244,0.82); flex: 1; min-width: 220px; line-height: 1.55; }
.cookie-text a { color: var(--canvas); text-decoration: underline; }
.cookie-btns { display: flex; gap: 10px; flex-shrink: 0; }
.btn-cookie-accept { background: var(--primary); color: var(--on-primary); border: none; border-radius: 8px; padding: 8px 18px; font-size: 14px; font-weight: 500; cursor: pointer; font-family: inherit; }
.btn-cookie-accept:hover { background: var(--primary-active); }
.btn-cookie-reject { background: transparent; color: rgba(247,247,244,0.7); border: 1px solid rgba(247,247,244,0.3); border-radius: 8px; padding: 8px 18px; font-size: 14px; font-weight: 500; cursor: pointer; font-family: inherit; }

.site-footer { background: var(--canvas); border-top: 1px solid var(--hairline); padding: 64px 0 48px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-logo { font-size: 18px; font-weight: 600; color: var(--ink); letter-spacing: -0.02em; margin-bottom: 12px; }
.footer-logo span { color: var(--primary); }
.footer-brand-desc { font-size: 14px; color: var(--body); line-height: 1.6; max-width: 260px; }
.footer-col h4 { font-size: 13px; font-weight: 600; color: var(--ink); text-transform: uppercase; letter-spacing: 0.55px; margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { font-size: 14px; color: var(--body); transition: color 0.15s; }
.footer-col a:hover { color: var(--ink); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; padding-top: 24px; border-top: 1px solid var(--hairline); flex-wrap: wrap; gap: 12px; }
.footer-copy { font-size: 13px; color: var(--muted); }
.footer-updated { font-size: 13px; color: var(--muted-soft); }

.page-header { padding: 64px 0 48px; border-bottom: 1px solid var(--hairline); margin-bottom: 64px; }
.page-header h1 { font-size: 48px; font-weight: 400; letter-spacing: -1.2px; color: var(--ink); line-height: 1.1; margin-bottom: 16px; }
.page-header p { font-size: 16px; color: var(--body); max-width: 580px; line-height: 1.65; }
.page-content { max-width: 740px; padding-bottom: 80px; }
.page-content h2 { font-size: 26px; font-weight: 400; letter-spacing: -0.4px; color: var(--ink); margin: 40px 0 14px; line-height: 1.3; }
.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: 1.7; margin-bottom: 16px; }
.page-content ul, .page-content ol { padding-left: 24px; margin-bottom: 16px; }
.page-content li { font-size: 16px; color: var(--body); line-height: 1.7; margin-bottom: 8px; }
.page-content a { color: var(--primary); text-decoration: underline; text-decoration-thickness: 1px; }
.page-content a:hover { color: var(--primary-active); }

.about-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin: 48px 0; }
.stat-card { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: 12px; padding: 28px 24px; }
.stat-value { font-size: 32px; font-weight: 400; color: var(--ink); letter-spacing: -0.8px; margin-bottom: 8px; }
.stat-label { font-size: 14px; color: var(--muted); line-height: 1.5; }

@media (max-width: 1024px) {
  .hero h1 { font-size: 42px; }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-image { display: none; }
  .hero h1 { font-size: 32px; letter-spacing: -0.5px; }
  .section-title { font-size: 28px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .article-header h1 { font-size: 32px; letter-spacing: -0.5px; }
  .page-header h1 { font-size: 36px; }
  .about-stats { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .cards-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .cookie-inner { flex-direction: column; align-items: flex-start; }
  .hero { padding: 48px 0; }
  .section { padding: 56px 0; }
}