@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;

    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-pill: 9999px;

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

    --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 {
    font-family: var(--font-sans);
    background-color: var(--color-canvas);
    color: var(--color-body);
    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 var(--spacing-xl);
}

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

.site-nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-brand {
    font-family: var(--font-sans);
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: -0.5px;
}

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

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

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

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

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

.nav-hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
    background: none;
    border: none;
}

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

.nav-mobile {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-canvas);
    border-bottom: 1px solid var(--color-hairline);
    padding: var(--spacing-base) 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-sm);
}

.nav-mobile a {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-body);
    display: block;
    padding: 6px 0;
}

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

.hero-inner {
    max-width: 720px;
}

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

.hero h1 {
    font-size: 56px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -1.5px;
    color: var(--color-ink);
    margin-bottom: var(--spacing-lg);
}

.hero p {
    font-size: 18px;
    line-height: 1.5;
    color: var(--color-body);
    max-width: 560px;
    margin-bottom: var(--spacing-xxl);
}

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

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

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

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

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

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

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

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

.card-icon {
    width: 40px;
    height: 40px;
    background-color: var(--color-surface-strong);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-base);
    font-size: 20px;
}

/* ARTICLE CARDS */
.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: 200px;
    object-fit: cover;
}

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

.article-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--color-muted);
    background-color: var(--color-surface-strong);
    padding: 3px 8px;
    border-radius: var(--radius-pill);
    margin-bottom: var(--spacing-sm);
}

.article-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--spacing-xs);
    line-height: 1.35;
}

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

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

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

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

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

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

.article-header h1 {
    font-size: 42px;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -1px;
    color: var(--color-ink);
    max-width: 720px;
    margin-bottom: var(--spacing-lg);
}

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

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

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

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

.article-content li {
    margin-bottom: 6px;
}

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

.article-content blockquote {
    border-left: 3px solid var(--color-hairline-strong);
    padding-left: var(--spacing-base);
    margin: var(--spacing-xl) 0;
    font-size: 18px;
    font-style: italic;
    color: var(--color-muted);
    line-height: 1.6;
}

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

.article-content .info-box h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-content .info-box p {
    font-size: 14px;
    color: var(--color-body);
    margin-bottom: 0;
}

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

.article-image img {
    width: 100%;
    height: 360px;
    object-fit: cover;
}

.article-image figcaption {
    padding: var(--spacing-xs) var(--spacing-base);
    font-size: 13px;
    color: var(--color-muted);
    background-color: var(--color-surface-card);
    border-top: 1px solid var(--color-hairline);
}

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

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

.toc-box h4 {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: var(--spacing-sm);
}

.toc-box ol {
    list-style: none;
    padding: 0;
    counter-reset: toc;
}

.toc-box li {
    counter-increment: toc;
    margin-bottom: 8px;
}

.toc-box li::before {
    content: counter(toc) ". ";
    color: var(--color-muted-soft);
    font-size: 13px;
}

.toc-box a {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.4;
}

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

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

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

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

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

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

/* 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;
    gap: var(--spacing-section);
    margin-bottom: var(--spacing-xxl);
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-body);
    margin-top: var(--spacing-sm);
    max-width: 280px;
}

.footer-col h4 {
    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: 8px;
}

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

.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;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-base);
}

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

.footer-disclaimer {
    margin-top: var(--spacing-xxl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-hairline-soft);
}

.footer-disclaimer p {
    font-size: 13px;
    color: var(--color-muted);
    line-height: 1.5;
}

/* CONTACT FORM */
.form-section {
    background-color: var(--color-canvas);
    padding: var(--spacing-section) 0;
}

.form-card {
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xxl);
    max-width: 600px;
}

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

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

.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(--radius-md);
    padding: 12px 16px;
    font-family: var(--font-sans);
    font-size: 14px;
    height: 44px;
    transition: border-color 0.15s;
    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: 4px;
    display: none;
}

.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;
    padding: 10px 18px;
    height: 40px;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: background-color 0.15s;
    text-decoration: none;
}

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

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

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

.form-success {
    display: none;
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
}

.form-success p {
    font-size: 16px;
    color: var(--color-success);
    font-weight: 500;
}

/* COOKIE BANNER */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--color-ink);
    color: var(--color-canvas);
    padding: var(--spacing-base) var(--spacing-xl);
    z-index: 200;
    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: var(--spacing-base);
    flex-wrap: wrap;
}

.cookie-inner p {
    font-size: 14px;
    color: var(--color-canvas);
    line-height: 1.5;
    max-width: 700px;
}

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

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

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

.btn-cookie-reject {
    background-color: transparent;
    color: var(--color-canvas);
    border: 1px solid rgba(247, 247, 244, 0.3);
    border-radius: var(--radius-md);
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
}

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

.btn-cookie-reject:hover {
    border-color: rgba(247, 247, 244, 0.6);
}

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

.page-header h1 {
    font-size: 42px;
    font-weight: 400;
    letter-spacing: -1px;
    color: var(--color-ink);
    margin-bottom: var(--spacing-base);
}

.page-header p {
    font-size: 18px;
    color: var(--color-body);
    max-width: 560px;
}

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

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

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

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

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

.page-content ul, .page-content ol {
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-body);
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-base);
}

.page-content li {
    margin-bottom: 6px;
}

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

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

/* ABOUT PAGE */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

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

.about-image img {
    width: 100%;
    height: 320px;
    object-fit: cover;
}

/* STATS ROW */
.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin: var(--spacing-section) 0;
}

.stat-item {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
}

.stat-item .stat-number {
    font-size: 36px;
    font-weight: 400;
    color: var(--color-ink);
    letter-spacing: -1px;
    display: block;
    margin-bottom: 4px;
}

.stat-item .stat-label {
    font-size: 14px;
    color: var(--color-muted);
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 44px;
    }

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

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-xl);
    }

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

    .article-sidebar {
        position: static;
        display: none;
    }

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

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

    .nav-hamburger {
        display: flex;
    }

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

    .hero p {
        font-size: 16px;
    }

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

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

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

    .stats-row {
        grid-template-columns: 1fr;
    }

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

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

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

    .article-header h1 {
        font-size: 28px;
    }

    .page-header h1 {
        font-size: 28px;
    }

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

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

@media (max-width: 640px) {
    .hero {
        padding: 48px 0;
    }

    .section {
        padding: 48px 0;
    }

    .hero h1 {
        font-size: 28px;
    }
}