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

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

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

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

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

a { color: inherit; text-decoration: none; }
a:hover { color: var(--ink); }
img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 {
    color: var(--ink);
    font-weight: 400;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

h1 { font-size: 48px; letter-spacing: -1.5px; }
h2 { font-size: 36px; letter-spacing: -0.72px; }
h3 { font-size: 26px; letter-spacing: -0.325px; }
h4 { font-size: 22px; letter-spacing: -0.11px; }

p { margin-bottom: var(--spacing-base); color: var(--body); }

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

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

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

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

.site-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--body);
    transition: color 0.15s;
}

.nav-link:hover, .nav-link--active { color: var(--ink); }

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

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

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

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

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

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

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

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

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

.hero h1 {
    font-size: 64px;
    max-width: 820px;
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
    letter-spacing: -2px;
}

.hero-desc {
    font-size: 18px;
    color: var(--body);
    max-width: 560px;
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

.hero-img {
    margin-top: var(--spacing-section);
    border-radius: var(--rounded-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
}

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

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

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

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

.section-desc {
    font-size: 16px;
    color: var(--body);
    max-width: 600px;
    line-height: 1.6;
    margin-bottom: var(--spacing-xxl);
}

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

.card {
    background-color: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-lg);
    transition: border-color 0.15s;
}

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

.card-img {
    border-radius: var(--rounded-md);
    overflow: hidden;
    margin-bottom: var(--spacing-base);
    height: 200px;
}

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

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

.card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.2px;
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
}

.card p {
    font-size: 14px;
    color: var(--body);
    line-height: 1.6;
    margin-bottom: var(--spacing-base);
}

.card-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary);
}

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

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

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

.intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.intro-text h2 {
    margin-bottom: var(--spacing-base);
}

.intro-text p {
    font-size: 16px;
    line-height: 1.7;
    margin-bottom: var(--spacing-base);
}

.intro-img {
    border-radius: var(--rounded-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
}

.intro-img img {
    width: 100%;
    height: 380px;
    object-fit: cover;
}

.facts-band {
    padding: var(--spacing-section) 0;
    background-color: var(--surface-card);
    border-top: 1px solid var(--hairline);
    border-bottom: 1px solid var(--hairline);
}

.facts-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.fact-item {
    padding: var(--spacing-lg);
    border-right: 1px solid var(--hairline);
}

.fact-item:last-child { border-right: none; }

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

.fact-value {
    font-size: 26px;
    font-weight: 400;
    color: var(--ink);
    letter-spacing: -0.3px;
    margin-bottom: var(--spacing-xxs);
}

.fact-desc {
    font-size: 13px;
    color: var(--muted);
    line-height: 1.5;
}

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

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

.article-meta .card-tag { margin-bottom: 0; }

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

.article-header h1 {
    font-size: 52px;
    max-width: 860px;
    margin-bottom: var(--spacing-md);
    letter-spacing: -1.8px;
}

.article-lead {
    font-size: 18px;
    color: var(--body);
    max-width: 680px;
    line-height: 1.7;
}

.article-hero-img {
    margin-top: var(--spacing-xxl);
    border-radius: var(--rounded-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
}

.article-hero-img img {
    width: 100%;
    height: 480px;
    object-fit: cover;
}

.img-caption {
    font-size: 13px;
    color: var(--muted);
    margin-top: var(--spacing-xs);
    font-style: italic;
}

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

.article-content {
    max-width: 740px;
}

.article-content h2 {
    font-size: 28px;
    margin-top: var(--spacing-xxl);
    margin-bottom: var(--spacing-base);
    letter-spacing: -0.4px;
}

.article-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.1px;
}

.article-content p {
    font-size: 16px;
    line-height: 1.75;
    color: var(--body);
    margin-bottom: var(--spacing-base);
}

.article-content ul, .article-content ol {
    margin: var(--spacing-base) 0;
    padding-left: var(--spacing-xl);
}

.article-content li {
    font-size: 16px;
    line-height: 1.75;
    color: var(--body);
    margin-bottom: var(--spacing-xs);
}

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

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

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

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

.info-box-title {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.steps-list {
    counter-reset: steps;
    list-style: none;
    padding: 0;
}

.steps-list li {
    counter-increment: steps;
    display: flex;
    gap: var(--spacing-base);
    margin-bottom: var(--spacing-lg);
    align-items: flex-start;
}

.steps-list li::before {
    content: counter(steps);
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    background-color: var(--surface-strong);
    color: var(--ink);
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--rounded-pill);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 2px;
}

.article-sidebar {
    position: sticky;
    top: 84px;
}

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

.sidebar-title {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: var(--spacing-base);
}

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

.toc-list li { margin-bottom: var(--spacing-xs); }

.toc-list a {
    font-size: 14px;
    color: var(--body);
    transition: color 0.15s;
}

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

.article-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: var(--spacing-xxl);
}

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

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

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

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

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

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

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

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

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

.form-success {
    background-color: var(--surface-card);
    border: 1px solid var(--hairline);
    border-left: 3px solid var(--semantic-success);
    border-radius: var(--rounded-md);
    padding: var(--spacing-lg);
    font-size: 15px;
    color: var(--semantic-success);
    display: none;
    margin-top: var(--spacing-base);
}

.btn-loading {
    opacity: 0.7;
    pointer-events: none;
}

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

.page-header h1 {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    letter-spacing: -1.5px;
}

.page-header p {
    font-size: 18px;
    color: var(--body);
    max-width: 560px;
    line-height: 1.6;
    margin-bottom: 0;
}

.page-content {
    padding: var(--spacing-section) 0;
    max-width: 740px;
}

.page-content h2 {
    font-size: 24px;
    font-weight: 600;
    margin-top: var(--spacing-xxl);
    margin-bottom: var(--spacing-base);
    color: var(--ink);
}

.page-content p, .page-content li {
    font-size: 16px;
    line-height: 1.75;
    color: var(--body);
    margin-bottom: var(--spacing-base);
}

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

.related-articles {
    padding: var(--spacing-section) 0;
    border-top: 1px solid var(--hairline);
}

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

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
}

.footer-brand {
    font-size: 16px;
    font-weight: 600;
    color: var(--ink);
    display: block;
    margin-bottom: var(--spacing-base);
}

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

.footer-tagline {
    font-size: 14px;
    color: var(--body);
    line-height: 1.6;
    margin-bottom: 0;
}

.footer-heading {
    display: block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: var(--spacing-base);
}

.footer-link {
    display: block;
    font-size: 14px;
    color: var(--body);
    margin-bottom: var(--spacing-xs);
    transition: color 0.15s;
}

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

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

.footer-bottom .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--muted);
}

.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--surface-card);
    border-top: 1px solid var(--hairline);
    z-index: 200;
    padding: var(--spacing-base) 0;
}

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

.cookie-inner p {
    font-size: 14px;
    color: var(--body);
    margin-bottom: 0;
    max-width: 680px;
    line-height: 1.5;
}

.cookie-inner a { color: var(--primary); }

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

@media (max-width: 1024px) {
    .cards-grid { grid-template-columns: repeat(2, 1fr); }
    .facts-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: 1fr 1fr 1fr; gap: var(--spacing-xl) var(--spacing-xl); }
    .article-layout { grid-template-columns: 1fr; }
    .article-sidebar { position: static; }
    .intro-grid { grid-template-columns: 1fr; }
    .intro-img { order: -1; }
}

@media (max-width: 768px) {
    h1 { font-size: 36px; }
    .hero h1 { font-size: 36px; letter-spacing: -1px; }
    .article-header h1 { font-size: 32px; letter-spacing: -0.8px; }
    .nav-toggle { display: flex; }
    .site-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background-color: var(--canvas);
        border-bottom: 1px solid var(--hairline);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-base) var(--spacing-xl);
        gap: var(--spacing-base);
    }
    .site-nav.open { display: flex; }
    .site-header { position: relative; }
    .cards-grid { grid-template-columns: 1fr; }
    .facts-grid { grid-template-columns: 1fr 1fr; }
    .footer-inner { grid-template-columns: 1fr 1fr; }
    .cookie-inner { flex-direction: column; align-items: flex-start; }
    .footer-bottom .container { flex-direction: column; gap: var(--spacing-xs); align-items: flex-start; }
}

@media (max-width: 480px) {
    .container { padding: 0 var(--spacing-base); }
    .facts-grid { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr; }
    .fact-item { border-right: none; border-bottom: 1px solid var(--hairline); padding-bottom: var(--spacing-base); }
    .fact-item:last-child { border-bottom: none; }
}