@import url('https://fonts.googleapis.com/css2?family=Inter:ital,wght@0,400;0,500;0,600;1,400&family=JetBrains+Mono:wght@400&display=swap');

:root {
    --canvas: #f7f7f4;
    --canvas-soft: #fafaf7;
    --surface-card: #ffffff;
    --surface-strong: #e6e5e0;
    --ink: #26251e;
    --body: #5a5852;
    --muted: #807d72;
    --muted-soft: #a09c92;
    --primary: #f54e00;
    --primary-active: #d04200;
    --on-primary: #ffffff;
    --hairline: #e6e5e0;
    --hairline-soft: #efeee8;
    --hairline-strong: #cfcdc4;
    --success: #1f8a65;
    --error: #cf2d56;
    --r-xs: 4px;
    --r-sm: 6px;
    --r-md: 8px;
    --r-lg: 12px;
    --r-xl: 16px;
    --r-pill: 9999px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: var(--canvas);
    color: var(--body);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

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

/* ── NAVIGATION ── */

.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: 16px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.2px;
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.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-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--ink);
}

.nav-toggle svg {
    width: 20px;
    height: 20px;
    display: block;
}

.nav-mobile {
    display: none;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    padding: 16px 24px;
}

.nav-mobile a {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--body);
    padding: 10px 0;
    border-bottom: 1px solid var(--hairline-soft);
}

.nav-mobile a:last-child { border-bottom: none; }
.nav-mobile a.active { color: var(--ink); }
.nav-mobile.open { display: block; }

/* ── HERO BAND ── */

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

.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);
    border-radius: var(--r-pill);
    padding: 4px 10px;
    margin-bottom: 24px;
}

.hero-band h1 {
    font-size: 72px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -2.16px;
    color: var(--ink);
    max-width: 800px;
    margin-bottom: 20px;
}

.hero-band p {
    font-size: 16px;
    line-height: 1.5;
    color: var(--body);
    max-width: 560px;
    margin-bottom: 0;
}

/* ── SECTION ── */

.section {
    padding: 80px 0;
}

.section-label {
    display: inline-block;
    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: 12px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--body);
    max-width: 560px;
    margin-bottom: 48px;
}

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

/* ── ARTICLE CARDS GRID ── */

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.article-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--r-lg);
    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-tag {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 10px;
}

.article-card-title {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.35;
    color: var(--ink);
    margin-bottom: 10px;
}

.article-card-excerpt {
    font-size: 14px;
    color: var(--body);
    line-height: 1.5;
    flex: 1;
    margin-bottom: 16px;
}

.article-card-meta {
    font-size: 13px;
    color: var(--muted);
    border-top: 1px solid var(--hairline-soft);
    padding-top: 12px;
    margin-top: auto;
}

/* ── FEATURED / INTRO BAND ── */

.intro-band {
    padding: 80px 0;
    background: var(--surface-card);
    border-top: 1px solid var(--hairline);
    border-bottom: 1px solid var(--hairline);
}

.intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.intro-grid-text h2 {
    font-size: 36px;
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.72px;
    color: var(--ink);
    margin-bottom: 16px;
}

.intro-grid-text p {
    font-size: 16px;
    color: var(--body);
    line-height: 1.6;
    margin-bottom: 12px;
}

.intro-grid-img {
    border-radius: var(--r-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
    aspect-ratio: 4/3;
}

.intro-grid-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ── TOPIC OVERVIEW BOX ── */

.topic-boxes {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 48px;
}

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

.topic-box-icon {
    font-size: 22px;
    margin-bottom: 12px;
}

.topic-box h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 8px;
}

.topic-box p {
    font-size: 14px;
    color: var(--body);
    line-height: 1.5;
}

/* ── ARTICLE PAGE ── */

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

.article-header-inner {
    max-width: 720px;
}

.article-breadcrumb {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 16px;
    display: flex;
    gap: 8px;
    align-items: center;
}

.article-breadcrumb a {
    color: var(--muted);
    transition: color 0.15s;
}

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

.article-breadcrumb-sep {
    color: var(--hairline-strong);
}

.article-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    background: var(--surface-strong);
    border-radius: var(--r-pill);
    padding: 4px 10px;
    margin-bottom: 16px;
}

.article-header h1 {
    font-size: 48px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -1.2px;
    color: var(--ink);
    margin-bottom: 16px;
}

.article-header-lead {
    font-size: 18px;
    color: var(--body);
    line-height: 1.55;
    margin-bottom: 24px;
}

.article-meta {
    display: flex;
    gap: 20px;
    font-size: 13px;
    color: var(--muted);
    align-items: center;
    flex-wrap: wrap;
}

.article-meta-sep {
    width: 3px;
    height: 3px;
    background: var(--muted-soft);
    border-radius: 50%;
}

.article-body-wrap {
    display: grid;
    grid-template-columns: minmax(0, 720px) 280px;
    gap: 64px;
    padding: 64px 0 80px;
    align-items: start;
}

.article-body h2 {
    font-size: 26px;
    font-weight: 400;
    line-height: 1.25;
    letter-spacing: -0.325px;
    color: var(--ink);
    margin-top: 48px;
    margin-bottom: 16px;
}

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

.article-body h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    margin-top: 32px;
    margin-bottom: 10px;
}

.article-body p {
    font-size: 16px;
    line-height: 1.6;
    color: var(--body);
    margin-bottom: 16px;
}

.article-body ul,
.article-body ol {
    padding-left: 20px;
    margin-bottom: 16px;
}

.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }

.article-body li {
    font-size: 16px;
    line-height: 1.6;
    color: var(--body);
    margin-bottom: 6px;
    padding-left: 4px;
}

.article-body a {
    color: var(--ink);
    text-decoration: underline;
    text-underline-offset: 2px;
    text-decoration-color: var(--hairline-strong);
}

.article-body a:hover {
    text-decoration-color: var(--ink);
}

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

.article-body figure {
    margin: 32px 0;
    border-radius: var(--r-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
}

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

.article-body figcaption {
    font-size: 13px;
    color: var(--muted);
    line-height: 1.4;
    padding: 10px 16px;
    background: var(--canvas-soft);
    border-top: 1px solid var(--hairline-soft);
}

.info-box {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-left: 3px solid var(--ink);
    border-radius: var(--r-md);
    padding: 20px 24px;
    margin: 24px 0;
}

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

.info-box p {
    font-size: 14px;
    color: var(--body);
    margin-bottom: 0;
}

.data-table-wrap {
    overflow-x: auto;
    margin: 24px 0;
    border: 1px solid var(--hairline);
    border-radius: var(--r-lg);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.data-table th {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    background: var(--canvas-soft);
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--hairline);
}

.data-table td {
    padding: 12px 16px;
    color: var(--body);
    border-bottom: 1px solid var(--hairline-soft);
}

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

.data-table tbody tr:hover td {
    background: var(--canvas-soft);
}

.code-block {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--r-lg);
    padding: 20px;
    margin: 24px 0;
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 13px;
    color: var(--ink);
    overflow-x: auto;
    line-height: 1.5;
}

/* ── ARTICLE SIDEBAR ── */

.article-sidebar {
    position: sticky;
    top: 84px;
}

.sidebar-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--r-lg);
    padding: 20px;
    margin-bottom: 16px;
}

.sidebar-card-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 14px;
}

.sidebar-toc {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sidebar-toc a {
    font-size: 13px;
    color: var(--body);
    line-height: 1.4;
    padding: 4px 0;
    border-left: 2px solid transparent;
    padding-left: 10px;
    transition: all 0.15s;
}

.sidebar-toc a:hover {
    color: var(--ink);
    border-left-color: var(--ink);
}

.sidebar-toc a.active {
    color: var(--ink);
    border-left-color: var(--primary);
    font-weight: 500;
}

.sidebar-related a {
    display: block;
    font-size: 13px;
    color: var(--body);
    padding: 8px 0;
    border-bottom: 1px solid var(--hairline-soft);
    line-height: 1.4;
    transition: color 0.15s;
}

.sidebar-related a:last-child { border-bottom: none; }
.sidebar-related a:hover { color: var(--ink); }

/* ── CONTACT FORM ── */

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

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

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

.contact-detail-row strong {
    color: var(--ink);
    font-weight: 600;
    min-width: 60px;
}

.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--ink);
    margin-bottom: 6px;
}

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

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

.form-textarea {
    height: auto;
    min-height: 120px;
    resize: vertical;
}

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

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

.form-error {
    font-size: 12px;
    color: var(--error);
    margin-top: 4px;
    display: none;
}

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

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

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

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.form-success {
    background: var(--canvas-soft);
    border: 1px solid var(--hairline);
    border-left: 3px solid var(--success);
    border-radius: var(--r-md);
    padding: 16px 20px;
    font-size: 14px;
    color: var(--body);
    display: none;
}

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

/* ── ABOUT PAGE ── */

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

.page-header h1 {
    font-size: 48px;
    font-weight: 400;
    letter-spacing: -1.2px;
    color: var(--ink);
    margin-bottom: 12px;
}

.page-header p {
    font-size: 18px;
    color: var(--body);
    max-width: 560px;
}

.page-body {
    padding: 64px 0 80px;
    max-width: 720px;
}

.page-body h2 {
    font-size: 26px;
    font-weight: 400;
    letter-spacing: -0.325px;
    color: var(--ink);
    margin-top: 48px;
    margin-bottom: 14px;
}

.page-body h2:first-child { margin-top: 0; }

.page-body p {
    font-size: 16px;
    color: var(--body);
    line-height: 1.6;
    margin-bottom: 14px;
}

.page-body ul {
    list-style: disc;
    padding-left: 20px;
    margin-bottom: 14px;
}

.page-body li {
    font-size: 16px;
    color: var(--body);
    line-height: 1.6;
    margin-bottom: 6px;
}

/* ── 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 1fr;
    gap: 40px;
    margin-bottom: 48px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--body);
    line-height: 1.5;
    margin-top: 10px;
    max-width: 240px;
}

.footer-brand .brand-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--ink);
}

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

.footer-col-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: var(--body);
    line-height: 1.4;
    margin-bottom: 10px;
    transition: color 0.15s;
}

.footer-col 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-text {
    font-size: 13px;
    color: var(--muted);
}

.footer-disclaimer {
    font-size: 12px;
    color: var(--muted-soft);
    margin-top: 8px;
    max-width: 600px;
}

/* ── 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: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.cookie-banner.hidden { display: none; }

.cookie-text {
    font-size: 14px;
    color: var(--canvas-soft);
    line-height: 1.5;
    flex: 1;
    min-width: 240px;
}

.cookie-text a {
    color: var(--canvas);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.cookie-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.cookie-accept {
    background: var(--primary);
    color: var(--on-primary);
    border: none;
    border-radius: var(--r-md);
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.15s;
}

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

.cookie-reject {
    background: transparent;
    color: var(--muted-soft);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--r-md);
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.15s;
}

.cookie-reject:hover {
    color: var(--canvas);
    border-color: rgba(255,255,255,0.35);
}

/* ── RESPONSIVE ── */

@media (max-width: 1024px) {
    .hero-band h1 { font-size: 56px; letter-spacing: -1.5px; }
    .articles-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
    .article-body-wrap { grid-template-columns: 1fr; }
    .article-sidebar { position: static; }
    .intro-grid { gap: 40px; }
    .contact-grid { gap: 48px; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-toggle { display: flex; }
    .hero-band { padding: 48px 0; }
    .hero-band h1 { font-size: 38px; letter-spacing: -1px; }
    .section { padding: 48px 0; }
    .articles-grid { grid-template-columns: 1fr; }
    .intro-grid { grid-template-columns: 1fr; }
    .intro-grid-img { order: -1; }
    .topic-boxes { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .article-header h1 { font-size: 34px; letter-spacing: -0.7px; }
    .article-header-lead { font-size: 16px; }
    .page-header h1 { font-size: 36px; }
    .section-title { font-size: 28px; }
    .cookie-banner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-band h1 { font-size: 30px; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; align-items: flex-start; }
}