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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

a {
    color: var(--color-ink);
    text-decoration: none;
    transition: color 0.15s ease;
}

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

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

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

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

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

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

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

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

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

.nav-links a:hover {
    color: var(--color-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-color: var(--color-ink);
    transition: all 0.2s ease;
}

.nav-mobile {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-canvas);
    border-bottom: 1px solid var(--color-hairline);
    padding: var(--spacing-lg) var(--spacing-xl);
    z-index: 99;
}

.nav-mobile.open {
    display: block;
}

.nav-mobile ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-base);
}

.nav-mobile a {
    font-size: 16px;
    font-weight: 500;
    color: var(--color-ink);
}

/* Hero */
.hero-band {
    padding: var(--spacing-section) 0;
    background-color: var(--color-canvas);
}

.hero-band h1 {
    font-size: 72px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -2.16px;
    color: var(--color-ink);
    max-width: 800px;
    margin-bottom: var(--spacing-lg);
}

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

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

/* Section headings */
.section-label {
    font-size: 11px;
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: var(--spacing-base);
}

h2.display-lg {
    font-size: 36px;
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.72px;
    color: var(--color-ink);
    margin-bottom: var(--spacing-lg);
}

h3.display-md {
    font-size: 26px;
    font-weight: 400;
    line-height: 1.25;
    letter-spacing: -0.325px;
    color: var(--color-ink);
    margin-bottom: var(--spacing-base);
}

h4.display-sm {
    font-size: 22px;
    font-weight: 400;
    line-height: 1.3;
    letter-spacing: -0.11px;
    color: var(--color-ink);
    margin-bottom: var(--spacing-sm);
}

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

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

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

.card-grid {
    display: grid;
    gap: var(--spacing-base);
}

.card-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

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

.article-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 ease;
}

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

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

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

.article-card-body .section-label {
    margin-bottom: var(--spacing-xs);
}

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

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

.article-card-body .read-more {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-primary);
}

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

.section-alt {
    padding: var(--spacing-section) 0;
    background-color: var(--color-canvas-soft);
}

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

/* Article page */
.article-layout {
    padding: var(--spacing-section) 0;
}

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

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

.article-header h1 {
    font-size: 48px;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -1.2px;
    color: var(--color-ink);
    margin-bottom: var(--spacing-lg);
    margin-top: var(--spacing-base);
}

.article-header .article-lead {
    font-size: 18px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-body);
    margin-bottom: var(--spacing-base);
}

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

.article-content {
    color: var(--color-body);
}

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

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

.article-content p {
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-body);
    margin-bottom: var(--spacing-base);
}

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

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

.article-content img {
    width: 100%;
    border-radius: var(--rounded-lg);
    margin: var(--spacing-xl) 0;
    border: 1px solid var(--color-hairline);
}

.article-content .image-caption {
    font-size: 13px;
    color: var(--color-muted);
    margin-top: calc(-1 * var(--spacing-base));
    margin-bottom: var(--spacing-xl);
    line-height: 1.4;
}

.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-md);
    padding: var(--spacing-base) var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

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

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-xl) 0;
    font-size: 14px;
}

.article-content th {
    text-align: left;
    padding: var(--spacing-sm) var(--spacing-base);
    background-color: var(--color-surface-strong);
    color: var(--color-ink);
    font-weight: 600;
    border-bottom: 1px solid var(--color-hairline-strong);
}

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

.article-content tr:last-child td {
    border-bottom: none;
}

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

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

.article-toc .title-md {
    margin-bottom: var(--spacing-base);
}

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

.article-toc li {
    border-top: 1px solid var(--color-hairline-soft);
}

.article-toc a {
    display: block;
    padding: var(--spacing-xs) 0;
    font-size: 14px;
    font-weight: 400;
    color: var(--color-body);
}

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

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

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

.related-card img {
    width: 100%;
    height: 140px;
    object-fit: cover;
}

.related-card-body {
    padding: var(--spacing-base);
}

.related-card-body h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-ink);
    line-height: 1.4;
    margin-bottom: var(--spacing-xs);
}

.related-card-body p {
    font-size: 13px;
    color: var(--color-muted);
}

/* Badge */
.badge {
    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(--rounded-pill);
    padding: 4px 10px;
}

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

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

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

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

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

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

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

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

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

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

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

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

.form-error-msg.show {
    display: block;
}

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

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

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

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

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

.form-status.success {
    display: block;
    background-color: #e8f5f0;
    color: var(--color-success);
    border: 1px solid #b8ddd2;
}

.form-status.loading {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background-color: var(--color-surface-strong);
    color: var(--color-muted);
    border: 1px solid var(--color-hairline);
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--color-hairline-strong);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

/* Cookie Banner */
.cookie-banner {
    position: fixed;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-ink);
    color: var(--color-canvas);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-base) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    max-width: 680px;
    width: calc(100% - var(--spacing-xl));
    z-index: 200;
    box-shadow: none;
    border: 1px solid rgba(255,255,255,0.1);
}

.cookie-banner p {
    font-size: 14px;
    line-height: 1.4;
    flex: 1;
    color: var(--color-canvas);
}

.cookie-banner p a {
    color: var(--color-canvas);
    text-decoration: underline;
}

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

.cookie-accept {
    background-color: var(--color-primary);
    color: var(--color-on-primary);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--rounded-md);
    border: none;
    cursor: pointer;
}

.cookie-reject {
    background-color: transparent;
    color: var(--color-canvas);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--rounded-md);
    border: 1px solid rgba(255,255,255,0.3);
    cursor: pointer;
}

.cookie-banner.hidden {
    display: none;
}

/* Footer */
.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(--spacing-xxl);
    margin-bottom: var(--spacing-xxl);
}

.footer-brand .nav-logo {
    font-size: 16px;
    margin-bottom: var(--spacing-base);
    display: block;
}

.footer-brand p {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.5;
    max-width: 240px;
}

.footer-col h5 {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--spacing-base);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: var(--spacing-xs);
}

.footer-col a {
    font-size: 14px;
    color: var(--color-body);
}

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

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

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

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

/* Page header band */
.page-header {
    background-color: var(--color-canvas);
    border-bottom: 1px solid var(--color-hairline);
    padding: var(--spacing-xxl) 0;
}

.page-header h1 {
    font-size: 36px;
    font-weight: 400;
    letter-spacing: -0.72px;
    line-height: 1.2;
    color: var(--color-ink);
    margin-bottom: var(--spacing-sm);
}

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

/* Prose (static pages) */
.prose {
    max-width: 720px;
    padding: var(--spacing-section) 0;
}

.prose h2 {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-ink);
    margin-top: var(--spacing-xxl);
    margin-bottom: var(--spacing-base);
    line-height: 1.3;
}

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

.prose p {
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-body);
    margin-bottom: var(--spacing-base);
}

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

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

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

/* Tips grid */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-base);
    margin: var(--spacing-xl) 0;
}

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

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

.tip-card h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--spacing-xs);
}

.tip-card p {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.5;
    margin-bottom: 0;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-band h1 {
        font-size: 56px;
        letter-spacing: -1.5px;
    }

    .card-grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .article-sidebar {
        position: static;
    }

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-hamburger {
        display: flex;
    }

    .hero-band h1 {
        font-size: 36px;
        letter-spacing: -0.9px;
    }

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

    .article-header h1 {
        font-size: 32px;
        letter-spacing: -0.5px;
    }

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

    .card-grid-3,
    .card-grid-2 {
        grid-template-columns: 1fr;
    }

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

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

    .footer-brand {
        grid-column: 1 / -1;
    }

    .cookie-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-base);
    }

    h2.display-lg {
        font-size: 28px;
    }

    h3.display-md {
        font-size: 22px;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }

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