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

:root {
    --color-canvas: #f7f7f4;
    --color-canvas-soft: #fafaf7;
    --color-surface-card: #ffffff;
    --color-surface-strong: #e6e5e0;
    --color-ink: #26251e;
    --color-body: #5a5852;
    --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;
    --font-display: '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 {
    background-color: var(--color-canvas);
    color: var(--color-body);
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-ink);
    text-decoration: none;
}

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

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

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

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

.nav-brand {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: -0.3px;
    text-decoration: none;
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

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

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

.nav-hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-direction: column;
    gap: 5px;
}

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

.hero-band {
    padding: 80px 0;
    background: var(--color-canvas);
}

.hero-badge {
    display: inline-block;
    background: var(--color-surface-strong);
    color: var(--color-ink);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    margin-bottom: 24px;
}

.hero-title {
    font-size: 56px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -1.5px;
    color: var(--color-ink);
    max-width: 700px;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 16px;
    color: var(--color-body);
    max-width: 560px;
    line-height: 1.6;
    margin-bottom: 40px;
}

.hero-image-wrap {
    margin-top: 48px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-hairline);
    max-height: 460px;
}

.hero-image-wrap img {
    width: 100%;
    height: 460px;
    object-fit: cover;
}

.hero-image-caption {
    font-size: 13px;
    color: var(--color-muted);
    margin-top: 12px;
}

.section {
    padding: 80px 0;
}

.section-alt {
    background: 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: 16px;
}

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

.section-desc {
    font-size: 16px;
    color: var(--color-body);
    max-width: 560px;
    line-height: 1.6;
    margin-bottom: 48px;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

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

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

.article-card-body {
    padding: 24px;
}

.article-card-tag {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: 10px;
    display: block;
}

.article-card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    line-height: 1.4;
    margin-bottom: 10px;
}

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

.article-card-meta {
    font-size: 13px;
    color: var(--color-muted);
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--color-hairline-soft);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

.info-card-icon {
    font-size: 24px;
    margin-bottom: 16px;
    display: block;
}

.info-card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 8px;
}

.info-card-text {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.6;
}

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

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

.page-header-title {
    font-size: 48px;
    font-weight: 400;
    letter-spacing: -1.2px;
    color: var(--color-ink);
    line-height: 1.15;
    max-width: 680px;
    margin-bottom: 20px;
}

.page-header-desc {
    font-size: 16px;
    color: var(--color-body);
    max-width: 560px;
    line-height: 1.6;
}

.article-content {
    padding: 48px 0 80px;
}

.article-body {
    max-width: 720px;
}

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

.article-body h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-ink);
    margin-top: 32px;
    margin-bottom: 12px;
}

.article-body p {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.7;
    margin-bottom: 20px;
    letter-spacing: 0.08px;
}

.article-body ul,
.article-body ol {
    margin: 0 0 20px 24px;
    color: var(--color-body);
}

.article-body li {
    font-size: 16px;
    line-height: 1.7;
    margin-bottom: 8px;
}

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

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

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

.article-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.article-image-caption {
    padding: 12px 16px;
    font-size: 13px;
    color: var(--color-muted);
    background: var(--color-canvas-soft);
    border-top: 1px solid var(--color-hairline-soft);
}

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

.info-box p {
    margin-bottom: 0 !important;
    font-size: 15px;
}

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

.toc-card {
    background: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
}

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

.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-list li {
    margin-bottom: 8px;
}

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

.toc-list a:hover {
    color: var(--color-primary);
}

.related-articles-card {
    background: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    padding: 24px;
}

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

.related-item {
    padding: 12px 0;
    border-bottom: 1px solid var(--color-hairline-soft);
}

.related-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.related-item a {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-ink);
    text-decoration: none;
    line-height: 1.4;
    display: block;
}

.related-item a:hover {
    color: var(--color-primary);
}

.related-item-date {
    font-size: 12px;
    color: var(--color-muted);
    margin-top: 4px;
}

.form-section {
    background: var(--color-canvas-soft);
    padding: 80px 0;
    border-top: 1px solid var(--color-hairline-soft);
}

.contact-form {
    max-width: 560px;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-ink);
    margin-bottom: 6px;
}

.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(--radius-md);
    padding: 12px 16px;
    height: 44px;
    font-family: var(--font-display);
    font-size: 16px;
    outline: none;
    transition: border-color 0.15s ease;
}

.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: 4px;
    display: none;
}

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

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

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

.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(--radius-md);
    padding: 16px 20px;
    font-size: 15px;
    color: var(--color-success);
    margin-top: 16px;
}

.site-footer {
    background: 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;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: -0.3px;
    margin-bottom: 12px;
}

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

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

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

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 10px;
}

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

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

.footer-bottom {
    border-top: 1px solid var(--color-hairline-soft);
    padding-top: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.footer-bottom-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.footer-bottom-links a {
    font-size: 14px;
    color: var(--color-muted);
    text-decoration: none;
}

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

.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-ink);
    color: var(--color-canvas);
    padding: 20px 24px;
    z-index: 1000;
    display: none;
}

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

.cookie-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.cookie-text {
    font-size: 14px;
    color: #cfcdc4;
    line-height: 1.5;
    flex: 1;
    min-width: 200px;
}

.cookie-text a {
    color: var(--color-canvas);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.cookie-actions {
    display: flex;
    gap: 12px;
    flex-shrink: 0;
}

.btn-cookie-accept {
    background: var(--color-primary);
    color: var(--color-on-primary);
    border: none;
    border-radius: var(--radius-md);
    padding: 10px 18px;
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
}

.btn-cookie-reject {
    background: transparent;
    color: var(--color-canvas);
    border: 1px solid #807d72;
    border-radius: var(--radius-md);
    padding: 10px 18px;
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
}

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

.btn-cookie-reject:hover {
    border-color: var(--color-canvas);
}

.breadcrumb {
    font-size: 13px;
    color: var(--color-muted);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--color-muted);
    text-decoration: none;
}

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

.breadcrumb-sep {
    color: var(--color-muted-soft);
}

.prose-page {
    max-width: 760px;
    margin: 0 auto;
    padding: 48px 0 80px;
}

.prose-page h1 {
    font-size: 36px;
    font-weight: 400;
    letter-spacing: -0.72px;
    color: var(--color-ink);
    margin-bottom: 12px;
}

.prose-page .updated {
    font-size: 13px;
    color: var(--color-muted);
    margin-bottom: 40px;
    border-bottom: 1px solid var(--color-hairline-soft);
    padding-bottom: 24px;
}

.prose-page h2 {
    font-size: 22px;
    font-weight: 400;
    letter-spacing: -0.11px;
    color: var(--color-ink);
    margin-top: 40px;
    margin-bottom: 12px;
}

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

.prose-page ul {
    margin: 0 0 16px 24px;
}

.prose-page li {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.7;
    margin-bottom: 6px;
}

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

.article-two-col {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 48px;
    align-items: start;
}

.article-meta-bar {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 16px 0;
    margin-bottom: 32px;
    border-bottom: 1px solid var(--color-hairline-soft);
}

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

.divider {
    border: none;
    border-top: 1px solid var(--color-hairline);
    margin: 48px 0;
}

@media (max-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .article-two-col {
        grid-template-columns: 1fr;
    }

    .article-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
        letter-spacing: -0.9px;
    }

    .section-title {
        font-size: 28px;
    }

    .page-header-title {
        font-size: 32px;
        letter-spacing: -0.8px;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-canvas);
        border-bottom: 1px solid var(--color-hairline);
        flex-direction: column;
        padding: 16px 24px 24px;
        gap: 16px;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-hamburger {
        display: flex;
    }

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

@media (max-width: 640px) {
    .articles-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }

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

    .hero-band {
        padding: 48px 0;
    }

    .section {
        padding: 48px 0;
    }
}