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

    --rounded-xs: 4px;
    --rounded-sm: 6px;
    --rounded-md: 8px;
    --rounded-lg: 12px;
    --rounded-xl: 16px;
    --rounded-pill: 9999px;

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

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

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

html { scroll-behavior: smooth; }

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

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

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

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

ul { list-style: none; }

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

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

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-xl);
}

.nav-brand {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: -0.2px;
    white-space: nowrap;
}

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-base);
}

.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-body);
    padding: var(--space-xs) var(--space-xs);
    border-radius: var(--rounded-sm);
    transition: color 0.15s;
}

.nav-link:hover,
.nav-link--active { color: var(--color-ink); }

.nav-link--active { font-weight: 600; }

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

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

.hero {
    padding: var(--space-section) 0;
    background-color: var(--color-canvas);
}

.hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xxl);
    align-items: center;
}

.hero-label {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--color-muted);
    background-color: var(--color-surface-strong);
    border-radius: var(--rounded-pill);
    padding: var(--space-xxs) var(--space-sm);
    margin-bottom: var(--space-lg);
}

.hero-title {
    font-size: 56px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -1.5px;
    color: var(--color-ink);
    margin-bottom: var(--space-lg);
}

.hero-desc {
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-body);
    max-width: 480px;
    margin-bottom: var(--space-xl);
}

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

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

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

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

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

.section-title {
    font-size: 36px;
    font-weight: 400;
    letter-spacing: -0.72px;
    line-height: 1.2;
    color: var(--color-ink);
    margin-bottom: var(--space-base);
}

.section-desc {
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-body);
    max-width: 560px;
    margin-bottom: var(--space-xxl);
}

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

.card-grid--2 {
    grid-template-columns: repeat(2, 1fr);
}

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

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

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

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

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

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    line-height: 1.3;
    margin-bottom: var(--space-sm);
}

.card-title a { color: inherit; }
.card-title a:hover { color: var(--color-primary); }

.card-excerpt {
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-body);
    margin-bottom: var(--space-base);
}

.card-meta {
    font-size: 13px;
    color: var(--color-muted);
    display: flex;
    gap: var(--space-base);
    align-items: center;
}

.badge-pill {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--color-ink);
    background-color: var(--color-surface-strong);
    border-radius: var(--rounded-pill);
    padding: var(--space-xxs) var(--space-sm);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 500;
    line-height: 1;
    border-radius: var(--rounded-md);
    padding: 10px 18px;
    height: 40px;
    cursor: pointer;
    border: none;
    transition: background-color 0.15s, color 0.15s;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-on-primary);
}

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

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

.btn-secondary:hover { background-color: var(--color-surface-strong); color: var(--color-ink); }

.article-hero {
    padding: var(--space-section) 0 0;
    background-color: var(--color-canvas);
}

.article-hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.article-meta {
    display: flex;
    gap: var(--space-base);
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-lg);
}

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

.article-title {
    font-size: 48px;
    font-weight: 400;
    letter-spacing: -1.2px;
    line-height: 1.1;
    color: var(--color-ink);
    margin-bottom: var(--space-lg);
    max-width: 800px;
}

.article-intro {
    font-size: 18px;
    line-height: 1.6;
    color: var(--color-body);
    max-width: 680px;
    margin-bottom: var(--space-xxl);
}

.article-cover {
    width: 100%;
    height: 480px;
    object-fit: cover;
    border-radius: var(--rounded-lg);
    border: 1px solid var(--color-hairline);
}

.article-layout {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-xxl) var(--space-xl);
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--space-xxl);
    align-items: start;
}

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

.article-content h3 {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-ink);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-sm);
}

.article-content p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-body);
    margin-bottom: var(--space-base);
    letter-spacing: 0.08px;
}

.article-content ul,
.article-content ol {
    list-style: disc;
    padding-left: var(--space-xl);
    margin-bottom: var(--space-base);
}

.article-content ol { list-style: decimal; }

.article-content li {
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-body);
    margin-bottom: var(--space-xs);
}

.article-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

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

.article-content .info-box {
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--rounded-lg);
    padding: var(--space-lg);
    margin: var(--space-xl) 0;
}

.article-content .info-box p { margin-bottom: 0; }

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-xl) 0;
    font-size: 14px;
    background-color: var(--color-surface-card);
    border-radius: var(--rounded-lg);
    overflow: hidden;
    border: 1px solid var(--color-hairline);
}

.article-content th {
    background-color: var(--color-surface-strong);
    color: var(--color-ink);
    font-weight: 600;
    padding: var(--space-sm) var(--space-base);
    text-align: left;
    font-size: 13px;
    letter-spacing: 0.2px;
}

.article-content td {
    padding: var(--space-sm) var(--space-base);
    color: var(--color-body);
    border-top: 1px solid var(--color-hairline-soft);
}

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

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

.sidebar-card h3 {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: var(--space-base);
}

.sidebar-toc {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.sidebar-toc a {
    font-size: 14px;
    color: var(--color-body);
    padding: var(--space-xxs) 0;
    border-bottom: 1px solid transparent;
    transition: color 0.15s;
}

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

.sidebar-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.sidebar-links a {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.4;
}

.sidebar-links a:hover { color: var(--color-primary); }

.page-hero {
    padding: var(--space-section) 0 var(--space-xxl);
    border-bottom: 1px solid var(--color-hairline);
}

.page-hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.page-title {
    font-size: 48px;
    font-weight: 400;
    letter-spacing: -1.2px;
    line-height: 1.1;
    color: var(--color-ink);
    margin-bottom: var(--space-base);
}

.page-desc {
    font-size: 18px;
    line-height: 1.6;
    color: var(--color-body);
    max-width: 600px;
}

.page-content {
    max-width: 760px;
    margin: 0 auto;
    padding: var(--space-section) var(--space-xl);
}

.page-content h2 {
    font-size: 26px;
    font-weight: 400;
    letter-spacing: -0.325px;
    color: var(--color-ink);
    margin-top: var(--space-xxl);
    margin-bottom: var(--space-base);
}

.page-content h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-sm);
}

.page-content p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-body);
    margin-bottom: var(--space-base);
}

.page-content ul,
.page-content ol {
    list-style: disc;
    padding-left: var(--space-xl);
    margin-bottom: var(--space-base);
}

.page-content li {
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-body);
    margin-bottom: var(--space-xs);
}

.page-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.contact-form-wrap {
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
    padding: var(--space-xxl);
    margin-top: var(--space-xl);
}

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

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

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

.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);
}

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

.form-message--success {
    background-color: #edf7f3;
    color: var(--color-semantic-success);
    border: 1px solid #b3e0d0;
}

.form-message--error {
    background-color: #fdeef2;
    color: var(--color-semantic-error);
    border: 1px solid #f5c0ce;
}

.features-band {
    padding: var(--space-section) 0;
}

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

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

.feature-icon {
    font-size: 28px;
    margin-bottom: var(--space-base);
}

.feature-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--space-sm);
}

.feature-desc {
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-body);
}

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

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

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--space-xxl);
    margin-bottom: var(--space-xxl);
}

.footer-logo {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    display: inline-block;
    margin-bottom: var(--space-base);
}

.footer-tagline {
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-muted);
    max-width: 280px;
}

.footer-cols {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.footer-heading {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: var(--space-base);
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-col a,
.footer-col li {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.4;
    transition: color 0.15s;
}

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

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-xl);
    border-top: 1px solid var(--color-hairline);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-base);
}

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

.footer-disclaimer {
    font-size: 12px;
    color: var(--color-muted-soft);
}

.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--color-ink);
    color: var(--color-canvas);
    padding: var(--space-base) var(--space-xl);
    z-index: 9999;
    display: none;
}

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

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

.cookie-inner p { font-size: 14px; line-height: 1.5; }
.cookie-inner a { color: var(--color-canvas); text-decoration: underline; }

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

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

.updated-label {
    font-size: 13px;
    color: var(--color-muted);
    margin-bottom: var(--space-section);
    display: block;
}

@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; }
    .hero-title { font-size: 42px; }
    .article-layout { grid-template-columns: 1fr; }
    .article-sidebar { position: static; }
    .card-grid { grid-template-columns: repeat(2, 1fr); }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-container { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .container { padding: 0 var(--space-base); }
    .nav-container { padding: 0 var(--space-base); }

    .nav-menu {
        display: none;
        flex-direction: column;
        gap: 0;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background-color: var(--color-canvas);
        border-bottom: 1px solid var(--color-hairline);
        padding: var(--space-base) 0;
    }

    .nav-menu.is-open { display: flex; }
    .nav-menu li { width: 100%; }
    .nav-link { display: block; padding: var(--space-sm) var(--space-xl); border-radius: 0; }

    .nav-toggle { display: flex; }

    .hero { padding: var(--space-xxl) 0; }
    .hero-title { font-size: 32px; letter-spacing: -0.8px; }
    .hero-inner { padding: 0 var(--space-base); }

    .section { padding: var(--space-xxl) 0; }
    .section-title { font-size: 26px; }

    .card-grid { grid-template-columns: 1fr; padding: 0 var(--space-base); }
    .card-grid--2 { grid-template-columns: 1fr; }

    .feature-grid { grid-template-columns: 1fr; }

    .article-title { font-size: 30px; letter-spacing: -0.5px; }
    .article-hero-inner,
    .article-layout { padding: 0 var(--space-base); }
    .article-layout { padding-top: var(--space-xl); padding-bottom: var(--space-xl); }
    .article-cover { height: 240px; }

    .page-title { font-size: 30px; }
    .page-hero-inner,
    .page-content { padding: var(--space-xl) var(--space-base); }

    .footer-cols { grid-template-columns: repeat(2, 1fr); }
    .footer-container { padding: 0 var(--space-base); }
    .footer-bottom { padding: var(--space-lg) var(--space-base); flex-direction: column; align-items: flex-start; }

    .contact-form-wrap { padding: var(--space-xl) var(--space-base); }

    .cookie-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
    .footer-cols { grid-template-columns: 1fr; }
    .article-meta { gap: var(--space-sm); }
}