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

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

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

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

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

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

.nav-brand {
    display: flex;
    flex-direction: column;
    gap: 1px;
    text-decoration: none;
}

.brand-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: -0.11px;
    line-height: 1.2;
}

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

.brand-tagline {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-muted);
    letter-spacing: 0.88px;
    text-transform: uppercase;
    line-height: 1.4;
}

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

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

.nav-link:hover { color: var(--color-ink); }
.nav-link--active { color: var(--color-ink); border-bottom: 2px solid var(--color-primary); padding-bottom: 2px; }

.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(--color-ink);
    border-radius: 2px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.is-open span:nth-child(2) { opacity: 0; }
.nav-hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

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

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

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

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

.hero-subtitle {
    font-size: 18px;
    font-weight: 400;
    color: var(--color-body);
    line-height: 1.5;
    margin-bottom: var(--spacing-xl);
    max-width: 480px;
}

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

.hero-image-wrap img {
    width: 100%;
    height: 380px;
    object-fit: cover;
    display: block;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.0;
    border-radius: var(--rounded-md);
    border: none;
    cursor: pointer;
    transition: background-color 0.15s ease, color 0.15s ease;
    text-decoration: none;
    padding: 10px 18px;
    height: 40px;
}

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

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

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

.btn--secondary:hover { background: var(--color-canvas-soft); }

.btn--ink {
    background: var(--color-ink);
    color: var(--color-canvas);
    padding: 12px 20px;
    height: 44px;
}

.btn--ink:hover { background: #3a3930; }

.section {
    padding: var(--spacing-section) 0;
    border-bottom: 1px solid var(--color-hairline);
}

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

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

.section-subtitle {
    font-size: 16px;
    color: var(--color-body);
    max-width: 600px;
    line-height: 1.5;
    margin-bottom: var(--spacing-xxl);
}

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

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

.card {
    background: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
}

.card-img-wrap {
    border-radius: var(--rounded-md);
    overflow: hidden;
    margin-bottom: var(--spacing-base);
    background: var(--color-canvas-soft);
}

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

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

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

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

.card-date {
    font-size: 13px;
    color: var(--color-muted);
    margin-bottom: var(--spacing-base);
}

.card-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-primary);
    text-decoration: none;
    margin-top: auto;
}

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

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

.article-header {
    padding: var(--spacing-xxl) 0;
    border-bottom: 1px solid var(--color-hairline);
    background: var(--color-canvas);
}

.article-header-inner {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

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

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

.article-intro {
    font-size: 18px;
    color: var(--color-body);
    line-height: 1.5;
}

.article-hero-img {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.article-hero-img img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: var(--rounded-lg);
    border: 1px solid var(--color-hairline);
}

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

.article-body {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xxl) var(--spacing-lg);
}

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

.article-body h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-ink);
    line-height: 1.4;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
}

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

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

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

.article-body li {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.5;
    margin-bottom: var(--spacing-xs);
}

.article-body a {
    color: var(--color-primary);
    text-decoration: underline;
    text-decoration-color: transparent;
    transition: text-decoration-color 0.15s ease;
}

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

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

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

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

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

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

.example-table td {
    padding: var(--spacing-sm) var(--spacing-base);
    color: var(--color-body);
    border-bottom: 1px solid var(--color-hairline-soft);
}

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

.related-articles {
    background: var(--color-canvas-soft);
    border-top: 1px solid var(--color-hairline);
    padding: var(--spacing-xxl) 0;
}

.related-inner {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

.related-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-base);
}

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

.contact-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: start;
}

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

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

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

.form-input, .form-textarea {
    width: 100%;
    background: var(--color-surface-card);
    color: var(--color-ink);
    border: 1px solid var(--color-hairline-strong);
    border-radius: var(--rounded-md);
    padding: 12px 16px;
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.5;
    height: 44px;
    transition: border-color 0.15s ease;
    outline: none;
}

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

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

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

.form-error {
    font-size: 13px;
    color: var(--color-error);
    margin-top: var(--spacing-xxs);
    display: none;
}

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

.form-submit-wrap { margin-top: var(--spacing-lg); }

.form-success {
    display: none;
    background: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-left: 3px solid var(--color-success);
    border-radius: var(--rounded-md);
    padding: var(--spacing-base) var(--spacing-lg);
    margin-top: var(--spacing-base);
    font-size: 14px;
    color: var(--color-success);
}

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

.site-footer {
    background: var(--color-canvas);
    border-top: 1px solid var(--color-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);
    padding-bottom: var(--spacing-xxl);
    border-bottom: 1px solid var(--color-hairline);
}

.footer-brand {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: -0.11px;
    display: block;
    margin-bottom: var(--spacing-sm);
}

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

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

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

.footer-link {
    font-size: 14px;
    color: var(--color-body);
    text-decoration: none;
    transition: color 0.15s ease;
}

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

.footer-address p { font-size: 14px; color: var(--color-body); line-height: 1.6; }

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

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

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

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

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

.page-subtitle {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.5;
}

.page-body {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xxl) var(--spacing-lg);
}

.page-body h2 {
    font-size: 22px;
    font-weight: 400;
    color: var(--color-ink);
    letter-spacing: -0.11px;
    margin-top: var(--spacing-xxl);
    margin-bottom: var(--spacing-sm);
}

.page-body p, .page-body li {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.5;
    margin-bottom: var(--spacing-sm);
}

.page-body ul { list-style: disc; padding-left: var(--spacing-lg); }
.page-body a { color: var(--color-primary); }
.page-body a:hover { text-decoration: underline; }

.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-ink);
    color: var(--color-canvas);
    padding: var(--spacing-base) var(--spacing-lg);
    z-index: 1000;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.cookie-banner.is-visible { transform: translateY(0); }

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

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

.cookie-link { color: var(--color-primary); text-decoration: underline; }

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

.breadcrumb {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-base) var(--spacing-lg) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.breadcrumb-item {
    font-size: 13px;
    color: var(--color-muted);
}

.breadcrumb-item a { color: var(--color-muted); }
.breadcrumb-item a:hover { color: var(--color-ink); }
.breadcrumb-sep { color: var(--color-muted-soft); font-size: 13px; }

.disclaimer {
    background: var(--color-canvas-soft);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-md);
    padding: var(--spacing-base) var(--spacing-lg);
    margin: var(--spacing-xxl) 0 0;
    font-size: 13px;
    color: var(--color-muted);
    line-height: 1.5;
}

@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; }
    .hero-title { font-size: 40px; }
    .hero-image-wrap { display: none; }
    .card-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: 1fr 1fr; }
    .contact-inner { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-canvas);
        border-bottom: 1px solid var(--color-hairline);
        flex-direction: column;
        gap: 0;
        padding: var(--spacing-sm) 0;
    }
    .nav-menu.is-open { display: flex; }
    .nav-menu li { width: 100%; }
    .nav-link {
        display: block;
        padding: var(--spacing-sm) var(--spacing-lg);
        border-bottom: none;
    }
    .nav-link--active { border-bottom: none; border-left: 2px solid var(--color-primary); padding-left: calc(var(--spacing-lg) - 2px); }
    .nav-hamburger { display: flex; }
    .site-nav { position: relative; }
    .hero-title { font-size: 32px; letter-spacing: -1px; }
    .section-title { font-size: 28px; }
    .article-title { font-size: 28px; }
    .card-grid { grid-template-columns: 1fr; }
    .card-grid--2up { grid-template-columns: 1fr; }
    .related-grid { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; align-items: flex-start; }
    .cookie-inner { flex-direction: column; }
    .section { padding: 48px 0; }
    .hero { padding: 48px 0; }
}

@media (max-width: 640px) {
    .hero-title { font-size: 28px; }
    .article-hero-img img { height: 240px; }
}