@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 {
    --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-success: #1f8a65;
    --color-error: #cf2d56;

    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-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;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-body);
    background-color: var(--color-canvas);
    -webkit-font-smoothing: antialiased;
}

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

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

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

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

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.site-logo {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: -0.3px;
    line-height: 1.2;
}

.site-logo span {
    color: var(--color-primary);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    list-style: none;
}

.main-nav a {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-body);
    line-height: 1.4;
    transition: color 0.15s;
}

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

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

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

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

.hero-band h1 {
    font-size: 72px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -2.16px;
    color: var(--color-ink);
    max-width: 760px;
    margin-bottom: var(--space-lg);
}

.hero-band p {
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-body);
    max-width: 560px;
    margin-bottom: var(--space-xxl);
}

.badge-pill {
    display: inline-flex;
    align-items: center;
    background-color: var(--color-surface-strong);
    color: var(--color-ink);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    border-radius: var(--radius-pill);
    padding: 4px 10px;
    margin-bottom: var(--space-md);
}

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

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

.section-title {
    font-size: 36px;
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.72px;
    color: var(--color-ink);
    margin-bottom: var(--space-lg);
    max-width: 640px;
}

.section-body {
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-body);
    max-width: 640px;
    margin-bottom: var(--space-xl);
}

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

.card-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

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

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

.feature-card p {
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-body);
}

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

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

.article-card-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

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

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

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

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

.article-link {
    display: inline-block;
    margin-top: var(--space-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-primary);
}

.article-link:hover {
    color: var(--color-primary-active);
}

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

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

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

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

.form-input {
    display: block;
    width: 100%;
    height: 44px;
    padding: 0 var(--space-base);
    font-family: inherit;
    font-size: 16px;
    font-weight: 400;
    color: var(--color-ink);
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline-strong);
    border-radius: var(--radius-md);
    outline: none;
    transition: border-color 0.15s;
}

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

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

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    padding: 0 18px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-on-primary);
    background-color: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color 0.15s;
}

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

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    padding: 0 18px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-ink);
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline-strong);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: border-color 0.15s;
}

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

.form-success {
    display: none;
    padding: var(--space-base);
    background-color: #e8f5f0;
    border: 1px solid #9fd4be;
    border-radius: var(--radius-md);
    color: var(--color-success);
    font-size: 14px;
    font-weight: 500;
    margin-top: var(--space-base);
}

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

.form-loading {
    display: none;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-muted);
    font-size: 14px;
    margin-top: var(--space-base);
}

.form-loading.visible {
    display: flex;
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--color-hairline);
    border-top-color: var(--color-ink);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.site-footer {
    background-color: var(--color-canvas);
    border-top: 1px solid var(--color-hairline);
    padding: 64px 0 48px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: var(--space-xxl);
    margin-bottom: var(--space-xxl);
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-body);
    margin-top: var(--space-sm);
    max-width: 260px;
}

.footer-col h4 {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--color-ink);
    margin-bottom: var(--space-base);
}

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

.footer-links a {
    font-size: 14px;
    font-weight: 400;
    color: var(--color-body);
    transition: color 0.15s;
}

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

.footer-bottom {
    border-top: 1px solid var(--color-hairline);
    padding-top: var(--space-lg);
    font-size: 13px;
    color: var(--color-muted);
}

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

.page-hero h1 {
    font-size: 48px;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -1.2px;
    color: var(--color-ink);
    margin-bottom: var(--space-base);
    max-width: 640px;
}

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

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

.article-hero h1 {
    font-size: 48px;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -1.2px;
    color: var(--color-ink);
    margin-bottom: var(--space-base);
    max-width: 800px;
}

.article-meta {
    font-size: 13px;
    color: var(--color-muted);
    margin-top: var(--space-sm);
}

.article-content {
    max-width: 720px;
    margin: 0 auto;
}

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

.article-content h3 {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-ink);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-xs);
}

.article-content p {
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-body);
    margin-bottom: var(--space-base);
}

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

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

.article-content figure {
    margin: var(--space-xxl) 0;
}

.article-content figure img {
    width: 100%;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-hairline);
}

.article-content figcaption {
    font-size: 13px;
    color: var(--color-muted);
    margin-top: var(--space-xs);
    line-height: 1.4;
}

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

.article-content .info-box h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--space-xs);
}

.article-content .info-box p,
.article-content .info-box li {
    font-size: 14px;
    color: var(--color-body);
}

.article-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.article-content a:hover {
    color: var(--color-primary-active);
}

.breadcrumb {
    font-size: 13px;
    color: var(--color-muted);
    margin-bottom: var(--space-md);
}

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

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

.breadcrumb span {
    margin: 0 6px;
}

.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--color-surface-card);
    border-top: 1px solid var(--color-hairline);
    padding: var(--space-base) var(--space-lg);
    z-index: 999;
    display: none;
}

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

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

.cookie-inner p {
    flex: 1;
    font-size: 14px;
    color: var(--color-body);
    min-width: 200px;
}

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

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

.prose-page {
    max-width: 720px;
}

.prose-page 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);
}

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

.prose-page p {
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-body);
    margin-bottom: var(--space-base);
}

.prose-page ul {
    padding-left: var(--space-lg);
    margin-bottom: var(--space-base);
}

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

.prose-page a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.updated-date {
    font-size: 13px;
    color: var(--color-muted);
    margin-top: var(--space-xs);
}

.related-articles {
    border-top: 1px solid var(--color-hairline);
    padding-top: var(--space-xl);
    margin-top: var(--space-section);
}

.related-articles h3 {
    font-size: 22px;
    font-weight: 400;
    letter-spacing: -0.11px;
    color: var(--color-ink);
    margin-bottom: var(--space-lg);
}

@media (max-width: 1024px) {
    .hero-band h1 {
        font-size: 56px;
        letter-spacing: -1.4px;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr 1fr;
    }
    .footer-brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background-color: var(--color-canvas);
        border-bottom: 1px solid var(--color-hairline);
        flex-direction: column;
        padding: var(--space-base) var(--space-lg);
        gap: var(--space-base);
        align-items: flex-start;
    }
    .main-nav.open {
        display: flex;
    }
    .nav-toggle {
        display: flex;
    }
    .hero-band h1 {
        font-size: 36px;
        letter-spacing: -0.9px;
    }
    .card-grid {
        grid-template-columns: 1fr;
    }
    .card-grid-2 {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .page-hero h1, .article-hero h1 {
        font-size: 32px;
        letter-spacing: -0.5px;
    }
    .section-title {
        font-size: 28px;
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--space-base);
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .cookie-inner {
        flex-direction: column;
        align-items: flex-start;
    }
}