@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;
    --ink: #26251e;
    --body: #5a5852;
    --muted: #807d72;
    --muted-soft: #a09c92;
    --primary: #f54e00;
    --primary-active: #d04200;
    --on-primary: #ffffff;
    --surface-card: #ffffff;
    --surface-strong: #e6e5e0;
    --hairline: #e6e5e0;
    --hairline-soft: #efeee8;
    --hairline-strong: #cfcdc4;
    --success: #1f8a65;
    --error: #cf2d56;
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-pill: 9999px;
    --section: 80px;
    --max-width: 1200px;
}

html { scroll-behavior: smooth; }
body { background: var(--canvas); color: var(--body); font-family: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; font-weight: 400; line-height: 1.5; }
a { color: var(--ink); text-decoration: none; }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
code, pre { font-family: 'JetBrains Mono', monospace; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* NAV */
.site-nav { background: var(--canvas); border-bottom: 1px solid var(--hairline); height: 64px; position: sticky; top: 0; z-index: 100; }
.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: -0.3px; }
.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); line-height: 1.4; transition: color 0.15s; }
.nav-links a:hover { color: var(--ink); }
.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: all 0.2s; }
.nav-mobile { display: none; background: var(--canvas); border-bottom: 1px solid var(--hairline); }
.nav-mobile.open { display: block; }
.nav-mobile ul { list-style: none; padding: 16px 24px; display: flex; flex-direction: column; gap: 0; }
.nav-mobile ul li a { display: block; padding: 12px 0; font-size: 15px; font-weight: 500; color: var(--body); border-bottom: 1px solid var(--hairline-soft); }
.nav-mobile ul li:last-child a { border-bottom: none; }

/* HERO */
.hero { padding: var(--section) 0; background: var(--canvas); }
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.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: 20px; }
.hero h1 { font-size: 48px; font-weight: 400; line-height: 1.1; letter-spacing: -1.5px; color: var(--ink); margin-bottom: 20px; }
.hero-desc { font-size: 17px; font-weight: 400; line-height: 1.6; color: var(--body); margin-bottom: 0; }
.hero-image { position: relative; border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--hairline); aspect-ratio: 4/3; }
.hero-image img { width: 100%; height: 100%; object-fit: cover; }
.hero-image-caption { position: absolute; bottom: 0; left: 0; right: 0; background: rgba(38,37,30,0.6); color: #fff; font-size: 12px; padding: 8px 12px; }

/* SECTIONS */
section { padding: var(--section) 0; }
.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; line-height: 1.2; letter-spacing: -0.72px; color: var(--ink); margin-bottom: 16px; }
.section-desc { font-size: 16px; color: var(--body); max-width: 600px; }
.section-header { margin-bottom: 48px; }

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

/* ARTICLE CARDS */
.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 0.2s; }
.article-card:hover { border-color: var(--hairline-strong); }
.article-card-img { aspect-ratio: 16/9; overflow: hidden; }
.article-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s; }
.article-card:hover .article-card-img img { transform: scale(1.02); }
.article-card-body { padding: 24px; }
.article-card-tag { font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; display: block; }
.article-card-title { font-size: 18px; font-weight: 500; line-height: 1.35; color: var(--ink); margin-bottom: 10px; }
.article-card-title a { color: inherit; }
.article-card-title a:hover { color: var(--primary); }
.article-card-excerpt { font-size: 14px; color: var(--body); line-height: 1.5; margin-bottom: 16px; }
.article-card-meta { font-size: 13px; color: var(--muted); display: flex; gap: 16px; }

/* TOPIC OVERVIEW */
.overview-section { background: var(--surface-card); border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.overview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.overview-item { padding: 32px 0; }
.overview-item h3 { font-size: 16px; font-weight: 600; color: var(--ink); margin-bottom: 10px; }
.overview-item p { font-size: 14px; color: var(--body); line-height: 1.6; }
.overview-divider { border-left: 1px solid var(--hairline); }

/* CONTACT FORM */
.contact-section { background: var(--canvas); }
.contact-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; 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: 1.6; margin-bottom: 24px; }
.contact-detail { font-size: 14px; color: var(--muted); line-height: 1.8; }
.contact-detail a { color: var(--body); }

.contact-form { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: 40px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 13px; font-weight: 500; color: var(--ink); margin-bottom: 6px; }
.form-group input,
.form-group textarea,
.form-group select { width: 100%; background: var(--canvas); border: 1px solid var(--hairline-strong); border-radius: var(--radius-md); padding: 12px 16px; font-size: 15px; font-family: inherit; color: var(--ink); transition: border-color 0.15s; outline: none; height: 44px; }
.form-group textarea { height: auto; min-height: 120px; resize: vertical; }
.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-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.btn-primary { display: inline-block; background: var(--primary); color: var(--on-primary); font-size: 14px; font-weight: 500; padding: 10px 24px; height: 40px; border-radius: var(--radius-md); border: none; cursor: pointer; font-family: inherit; transition: background 0.15s; line-height: 1; }
.btn-primary:hover { background: var(--primary-active); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }
.form-status { margin-top: 16px; padding: 12px 16px; border-radius: var(--radius-md); font-size: 14px; display: none; }
.form-status.success { background: #e8f7f2; color: var(--success); border: 1px solid #b8e4d5; display: block; }
.form-status.error { background: #fef0f3; color: var(--error); border: 1px solid #f5b8c4; display: block; }
.form-status.loading { background: var(--surface-strong); color: var(--muted); border: 1px solid var(--hairline); display: block; }

/* ARTICLE PAGE */
.article-page { padding: var(--section) 0; }
.article-layout { display: grid; grid-template-columns: 1fr 300px; gap: 64px; align-items: start; }
.article-header { margin-bottom: 40px; }
.article-tag { font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); display: block; margin-bottom: 14px; }
.article-title { font-size: 42px; font-weight: 400; line-height: 1.15; letter-spacing: -1px; color: var(--ink); margin-bottom: 20px; }
.article-meta { font-size: 13px; color: var(--muted); display: flex; gap: 20px; flex-wrap: wrap; padding-bottom: 24px; border-bottom: 1px solid var(--hairline); }
.article-hero { border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--hairline); margin-bottom: 40px; }
.article-hero img { width: 100%; height: 400px; object-fit: cover; }
.article-hero figcaption { padding: 10px 16px; font-size: 12px; color: var(--muted); background: var(--surface-strong); }
.article-body { font-size: 16px; line-height: 1.75; color: var(--body); }
.article-body h2 { font-size: 26px; font-weight: 400; letter-spacing: -0.325px; color: var(--ink); margin: 40px 0 16px; }
.article-body h3 { font-size: 20px; font-weight: 500; color: var(--ink); margin: 28px 0 12px; }
.article-body p { margin-bottom: 20px; }
.article-body ul, .article-body ol { padding-left: 20px; margin-bottom: 20px; }
.article-body li { margin-bottom: 8px; }
.article-body a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.article-body a:hover { color: var(--primary); }
.article-body blockquote { border-left: 3px solid var(--hairline-strong); padding: 12px 20px; margin: 28px 0; font-style: italic; color: var(--muted); }
.article-body .highlight-box { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: 24px; margin: 28px 0; }
.article-body .highlight-box h4 { font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.5px; }

.article-sidebar { position: sticky; top: 88px; }
.sidebar-widget { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: 24px; margin-bottom: 24px; }
.sidebar-widget h4 { font-size: 13px; font-weight: 600; letter-spacing: 0.5px; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; }
.sidebar-toc { list-style: none; }
.sidebar-toc li { padding: 6px 0; border-bottom: 1px solid var(--hairline-soft); }
.sidebar-toc li:last-child { border-bottom: none; }
.sidebar-toc a { font-size: 13px; color: var(--body); }
.sidebar-toc a:hover { color: var(--ink); }
.sidebar-related li { padding: 8px 0; border-bottom: 1px solid var(--hairline-soft); list-style: none; }
.sidebar-related li:last-child { border-bottom: none; }
.sidebar-related a { font-size: 13px; color: var(--body); line-height: 1.4; }
.sidebar-related a:hover { color: var(--ink); }

/* INTERIOR PAGE */
.page-header { padding: 60px 0 40px; border-bottom: 1px solid var(--hairline); margin-bottom: 60px; }
.page-header .section-label { margin-bottom: 12px; }
.page-header h1 { font-size: 42px; font-weight: 400; letter-spacing: -1px; color: var(--ink); }
.page-body { max-width: 760px; }
.page-body h2 { font-size: 24px; font-weight: 500; color: var(--ink); margin: 36px 0 12px; }
.page-body h3 { font-size: 18px; font-weight: 500; color: var(--ink); margin: 24px 0 8px; }
.page-body p { font-size: 16px; line-height: 1.75; color: var(--body); margin-bottom: 16px; }
.page-body ul, .page-body ol { padding-left: 20px; margin-bottom: 16px; }
.page-body li { font-size: 16px; color: var(--body); line-height: 1.6; margin-bottom: 6px; }
.page-body a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }

/* FOOTER */
.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-brand h3 { font-size: 18px; font-weight: 600; color: var(--ink); margin-bottom: 12px; }
.footer-brand h3 span { color: var(--primary); }
.footer-brand p { font-size: 14px; color: var(--body); line-height: 1.6; max-width: 280px; }
.footer-col h4 { font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 14px; color: var(--body); }
.footer-col ul li a:hover { color: var(--ink); }
.footer-bottom { border-top: 1px solid var(--hairline); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.footer-bottom p { font-size: 13px; color: var(--muted); }
.footer-bottom a { font-size: 13px; color: var(--muted); }
.footer-bottom a:hover { color: var(--body); }

/* COOKIE BANNER */
.cookie-banner { position: fixed; bottom: 0; left: 0; right: 0; background: var(--ink); color: var(--canvas); padding: 20px 24px; z-index: 999; display: none; }
.cookie-banner.visible { display: block; }
.cookie-inner { max-width: var(--max-width); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.cookie-text { font-size: 14px; line-height: 1.5; color: var(--canvas); flex: 1; }
.cookie-text a { color: var(--canvas); text-decoration: underline; text-underline-offset: 2px; }
.cookie-actions { display: flex; gap: 10px; flex-shrink: 0; }
.btn-cookie-accept { background: var(--primary); color: var(--on-primary); border: none; padding: 8px 18px; border-radius: var(--radius-md); font-size: 13px; font-weight: 500; cursor: pointer; font-family: inherit; transition: background 0.15s; }
.btn-cookie-accept:hover { background: var(--primary-active); }
.btn-cookie-reject { background: transparent; color: var(--canvas); border: 1px solid rgba(255,255,255,0.3); padding: 8px 18px; border-radius: var(--radius-md); font-size: 13px; font-weight: 500; cursor: pointer; font-family: inherit; transition: border-color 0.15s; }
.btn-cookie-reject:hover { border-color: rgba(255,255,255,0.6); }

/* BREADCRUMB */
.breadcrumb { padding: 16px 0; }
.breadcrumb ol { list-style: none; display: flex; gap: 8px; font-size: 13px; color: var(--muted); }
.breadcrumb ol li::after { content: '/'; margin-left: 8px; }
.breadcrumb ol li:last-child::after { content: ''; }
.breadcrumb ol li a { color: var(--muted); }
.breadcrumb ol li a:hover { color: var(--body); }

/* ABOUT INTRO */
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; margin-bottom: 60px; }
.about-intro img { border-radius: var(--radius-lg); border: 1px solid var(--hairline); width: 100%; }

/* RESPONSIVE */
@media (max-width: 1024px) {
    .articles-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .hero-inner { gap: 40px; }
    .hero h1 { font-size: 38px; }
    .article-layout { grid-template-columns: 1fr; }
    .article-sidebar { position: static; }
}
@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-hamburger { display: flex; }
    .hero-inner { grid-template-columns: 1fr; }
    .hero { padding: 48px 0; }
    .hero h1 { font-size: 32px; letter-spacing: -1px; }
    .articles-grid { grid-template-columns: 1fr; }
    .overview-grid { grid-template-columns: 1fr; }
    .overview-divider { border-left: none; border-top: 1px solid var(--hairline); }
    .overview-item { padding: 24px 0; }
    .contact-wrap { grid-template-columns: 1fr; gap: 40px; }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; align-items: flex-start; }
    .section-title { font-size: 28px; }
    .contact-form { padding: 24px; }
    .about-intro { grid-template-columns: 1fr; gap: 32px; }
    .page-header h1 { font-size: 32px; }
    .article-title { font-size: 28px; }
}
@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero h1 { font-size: 28px; }
    .cookie-inner { flex-direction: column; align-items: flex-start; }
}