:root {
    --canvas: #f7f7f4;
    --canvas-soft: #fafaf7;
    --surface-card: #ffffff;
    --surface-strong: #e6e5e0;
    --primary: #f54e00;
    --primary-active: #d04200;
    --ink: #26251e;
    --body: #5a5852;
    --body-strong: #26251e;
    --muted: #807d72;
    --muted-soft: #a09c92;
    --on-primary: #ffffff;
    --hairline: #e6e5e0;
    --hairline-soft: #efeee8;
    --hairline-strong: #cfcdc4;
    --semantic-success: #1f8a65;
    --semantic-error: #cf2d56;
    --rounded-xs: 4px;
    --rounded-sm: 6px;
    --rounded-md: 8px;
    --rounded-lg: 12px;
    --rounded-xl: 16px;
    --rounded-pill: 9999px;
    --spacing-xxs: 4px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-base: 16px;
    --spacing-md: 20px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --spacing-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 { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background-color: var(--canvas);
    color: var(--body);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--primary); }

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

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

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

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.nav-logo {
    text-decoration: none;
    flex-shrink: 0;
}

.logo-text {
    font-family: var(--font-sans);
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.3px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-menu a {
    font-size: 14px;
    font-weight: 500;
    color: var(--body);
    text-decoration: none;
    line-height: 1.4;
    transition: color 0.15s;
}

.nav-menu a:hover,
.nav-menu a[aria-current="page"] {
    color: var(--ink);
}

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

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

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

.hero-inner {
    max-width: 760px;
}

.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(--rounded-pill);
    padding: 4px 10px;
    margin-bottom: var(--spacing-lg);
}

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

.hero-lead {
    font-size: 18px;
    font-weight: 400;
    line-height: 1.6;
    color: var(--body);
    max-width: 560px;
    margin-bottom: var(--spacing-xxl);
}

.hero-updated {
    font-size: 13px;
    color: var(--muted);
    margin-top: var(--spacing-lg);
}

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

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

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

.section-title-sm {
    font-size: 26px;
    font-weight: 400;
    letter-spacing: -0.325px;
    line-height: 1.25;
    color: var(--ink);
    margin-bottom: var(--spacing-lg);
}

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

.article-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.15s;
}

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

.article-card-img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.article-card-body {
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

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

.article-card-title {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--ink);
}

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

.article-card-date {
    font-size: 13px;
    color: var(--muted);
    margin-top: var(--spacing-sm);
}

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

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

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

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--ink);
    margin-bottom: var(--spacing-xs);
}

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

.article-page {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-xl);
    align-items: start;
}

.article-main {}

.article-header {
    margin-bottom: var(--spacing-xl);
}

.article-header h1 {
    font-size: 42px;
    font-weight: 400;
    letter-spacing: -0.84px;
    line-height: 1.15;
    color: var(--ink);
    margin-bottom: var(--spacing-md);
}

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

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

.article-hero-img {
    width: 100%;
    aspect-ratio: 16/7;
    object-fit: cover;
    border-radius: var(--rounded-lg);
    margin-bottom: var(--spacing-xl);
}

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

.article-content h2 {
    font-size: 26px;
    font-weight: 400;
    letter-spacing: -0.325px;
    color: var(--ink);
    margin: var(--spacing-xxl) 0 var(--spacing-base);
}

.article-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--ink);
    margin: var(--spacing-xl) 0 var(--spacing-sm);
}

.article-content p {
    margin-bottom: var(--spacing-base);
}

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

.article-content li {
    margin-bottom: var(--spacing-xs);
}

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

.article-content blockquote {
    border-left: 3px solid var(--hairline-strong);
    padding-left: var(--spacing-base);
    margin: var(--spacing-xl) 0;
    color: var(--muted);
    font-size: 17px;
    font-style: italic;
}

.info-box {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.info-box-title {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: var(--spacing-sm);
}

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

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

.sidebar-widget h3 {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: var(--spacing-base);
}

.sidebar-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.sidebar-links a {
    font-size: 14px;
    color: var(--body);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

.toc {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.toc a {
    font-size: 14px;
    color: var(--body);
    text-decoration: none;
}

.toc a:hover { color: var(--ink); text-decoration: underline; }

.page-header {
    padding: var(--spacing-section) 0 var(--spacing-xl);
    border-bottom: 1px solid var(--hairline);
    margin-bottom: var(--spacing-xl);
}

.page-header h1 {
    font-size: 42px;
    font-weight: 400;
    letter-spacing: -0.84px;
    color: var(--ink);
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    font-size: 16px;
    color: var(--body);
}

.page-content {
    max-width: 760px;
    font-size: 16px;
    line-height: 1.7;
    color: var(--body);
    padding-bottom: var(--spacing-section);
}

.page-content h2 {
    font-size: 22px;
    font-weight: 600;
    color: var(--ink);
    margin: var(--spacing-xxl) 0 var(--spacing-sm);
}

.page-content p { margin-bottom: var(--spacing-base); }
.page-content ul { padding-left: var(--spacing-xl); margin-bottom: var(--spacing-base); }
.page-content li { margin-bottom: var(--spacing-xs); }
.page-content a { color: var(--primary); }

.contact-form-wrap {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    max-width: 560px;
}

.contact-form-wrap h2 {
    font-size: 22px;
    font-weight: 400;
    letter-spacing: -0.325px;
    color: var(--ink);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-base);
}

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

.form-group input,
.form-group textarea {
    background: var(--surface-card);
    border: 1px solid var(--hairline-strong);
    border-radius: var(--rounded-md);
    padding: 12px var(--spacing-base);
    font-family: var(--font-sans);
    font-size: 16px;
    color: var(--ink);
    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(--ink);
}

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

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

.btn-secondary {
    background: var(--surface-card);
    color: var(--ink);
    border: 1px solid var(--hairline-strong);
    border-radius: var(--rounded-md);
    padding: 10px 18px;
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 500;
    height: 40px;
    cursor: pointer;
    transition: border-color 0.15s;
    display: inline-flex;
    align-items: center;
}

.btn-secondary:hover {
    border-color: var(--ink);
}

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

.form-status.success {
    background: #e8f5f0;
    color: var(--semantic-success);
    border: 1px solid #c3e6d8;
    display: block;
}

.form-status.loading {
    background: var(--surface-strong);
    color: var(--muted);
    border: 1px solid var(--hairline);
    display: block;
}

.cookie-banner {
    display: none;
    position: fixed;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    width: min(560px, calc(100vw - 2 * var(--spacing-lg)));
    background: var(--surface-card);
    border: 1px solid var(--hairline-strong);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-lg);
    z-index: 999;
    box-shadow: none;
}

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

.cookie-inner p {
    font-size: 14px;
    color: var(--body);
    margin-bottom: var(--spacing-base);
    line-height: 1.5;
}

.cookie-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.site-footer {
    background: var(--canvas);
    border-top: 1px solid var(--hairline);
    padding: 64px var(--spacing-lg) 48px;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    font-size: 16px;
    font-weight: 600;
    color: var(--ink);
    display: block;
    margin-bottom: var(--spacing-sm);
}

.footer-tagline {
    font-size: 14px;
    color: var(--body);
    line-height: 1.5;
}

.footer-col h3 {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: var(--spacing-base);
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-col a {
    font-size: 14px;
    color: var(--body);
    text-decoration: none;
}

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

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

.footer-bottom p {
    font-size: 14px;
    color: var(--muted);
}

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

.breadcrumb {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
    flex-wrap: wrap;
}

.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb-sep { color: var(--hairline-strong); }

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
    margin-bottom: var(--spacing-section);
}

.about-img {
    width: 100%;
    border-radius: var(--rounded-lg);
    aspect-ratio: 4/3;
    object-fit: cover;
}

@media (max-width: 1024px) {
    .hero h1 { font-size: 56px; letter-spacing: -1.5px; }
    .article-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: 1fr 1fr; gap: var(--spacing-xl); }
    .article-page { grid-template-columns: 1fr; }
    .article-sidebar { position: static; }
    .about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .nav-hamburger { display: flex; }
    .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--canvas);
        border-bottom: 1px solid var(--hairline);
        flex-direction: column;
        padding: var(--spacing-base) var(--spacing-lg);
        gap: var(--spacing-sm);
    }
    .nav-menu.is-open { display: flex; }
    .hero h1 { font-size: 36px; letter-spacing: -0.9px; }
    .hero-lead { font-size: 16px; }
    .section-title { font-size: 28px; }
    .article-header h1 { font-size: 30px; }
    .article-grid { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr 1fr; }
}

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