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

:root {
    --canvas: #f7f7f4;
    --canvas-soft: #fafaf7;
    --surface-card: #ffffff;
    --surface-strong: #e6e5e0;
    --primary: #f54e00;
    --primary-active: #d04200;
    --ink: #26251e;
    --body: #5a5852;
    --body-strong: #26251e;
    --muted: #807d72;
    --muted-soft: #a09c92;
    --on-primary: #ffffff;
    --hairline: #e6e5e0;
    --hairline-soft: #efeee8;
    --hairline-strong: #cfcdc4;
    --semantic-success: #1f8a65;
    --semantic-error: #cf2d56;
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-pill: 9999px;
}

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

body {
    background: var(--canvas);
    color: var(--body);
    font-family: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-weight: 400;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

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

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

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

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

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.nav-logo {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.3px;
    flex-shrink: 0;
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
    align-items: center;
}

.nav-links a {
    font-size: 14px;
    font-weight: 500;
    color: var(--body);
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    transition: color 0.15s, background 0.15s;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--ink);
    background: var(--surface-strong);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}

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

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

.hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

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

.hero h1 {
    font-size: 48px;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -1.2px;
    color: var(--ink);
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 16px;
    color: var(--body);
    line-height: 1.6;
    max-width: 480px;
    margin-bottom: 32px;
}

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

.hero-img {
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
    aspect-ratio: 4/3;
}

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

.section {
    padding: 80px 0;
}

.section--alt {
    background: var(--canvas-soft);
    border-top: 1px solid var(--hairline-soft);
    border-bottom: 1px solid var(--hairline-soft);
}

.section-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 12px;
    display: block;
}

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

.section-lead {
    font-size: 16px;
    color: var(--body);
    max-width: 600px;
    line-height: 1.6;
    margin-bottom: 48px;
}

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

.article-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color 0.2s;
}

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

.article-card-img {
    aspect-ratio: 16/9;
    overflow: hidden;
}

.article-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.article-card:hover .article-card-img img { transform: scale(1.03); }

.article-card-body {
    padding: 20px 24px 24px;
}

.article-card-tag {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 8px;
}

.article-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    line-height: 1.3;
    margin-bottom: 10px;
}

.article-card p {
    font-size: 14px;
    color: var(--body);
    line-height: 1.55;
    margin-bottom: 16px;
}

.article-card-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--ink);
    border-bottom: 1px solid var(--hairline-strong);
    padding-bottom: 1px;
    transition: color 0.15s, border-color 0.15s;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

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

.feature-icon {
    width: 40px;
    height: 40px;
    background: var(--surface-strong);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 20px;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--body);
    line-height: 1.55;
}

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

.page-hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.breadcrumb {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 16px;
    display: flex;
    gap: 8px;
    align-items: center;
}

.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb-sep { color: var(--hairline-strong); }

.page-hero h1 {
    font-size: 42px;
    font-weight: 400;
    letter-spacing: -0.9px;
    color: var(--ink);
    line-height: 1.15;
    margin-bottom: 16px;
    max-width: 700px;
}

.page-hero-meta {
    font-size: 13px;
    color: var(--muted);
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.article-layout {
    max-width: 1200px;
    margin: 0 auto;
    padding: 48px 24px 80px;
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 48px;
    align-items: start;
}

.article-body { min-width: 0; }

.article-img-main {
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
    margin-bottom: 32px;
    aspect-ratio: 16/7;
}

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

.article-content h2 {
    font-size: 26px;
    font-weight: 400;
    letter-spacing: -0.325px;
    color: var(--ink);
    line-height: 1.25;
    margin-top: 40px;
    margin-bottom: 14px;
}

.article-content h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    margin-top: 28px;
    margin-bottom: 10px;
}

.article-content p {
    font-size: 16px;
    color: var(--body);
    line-height: 1.65;
    margin-bottom: 16px;
}

.article-content ul, .article-content ol {
    margin: 0 0 16px 20px;
}

.article-content li {
    font-size: 16px;
    color: var(--body);
    line-height: 1.6;
    margin-bottom: 6px;
}

.article-content strong { color: var(--ink); font-weight: 600; }

.article-content .tip-box {
    background: var(--canvas-soft);
    border: 1px solid var(--hairline);
    border-left: 3px solid var(--primary);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin: 24px 0;
}

.article-content .tip-box p { margin: 0; font-size: 14px; }

.article-content .step-list {
    counter-reset: step-counter;
    list-style: none;
    margin: 0 0 16px 0;
}

.article-content .step-list li {
    counter-increment: step-counter;
    padding: 12px 16px 12px 48px;
    position: relative;
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-md);
    margin-bottom: 8px;
}

.article-content .step-list li::before {
    content: counter(step-counter);
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 22px;
    height: 22px;
    background: var(--ink);
    color: var(--canvas);
    font-size: 12px;
    font-weight: 600;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    text-align: center;
    padding-top: 2px;
}

.article-img-inline {
    margin: 28px 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
}

.article-img-inline img { width: 100%; }

.img-caption {
    font-size: 13px;
    color: var(--muted);
    padding: 8px 12px;
    background: var(--canvas-soft);
    border-top: 1px solid var(--hairline-soft);
}

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

.sidebar-card {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 20px;
}

.sidebar-card h4 {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 14px;
}

.sidebar-card ul { list-style: none; }
.sidebar-card li { border-bottom: 1px solid var(--hairline-soft); }
.sidebar-card li:last-child { border-bottom: none; }
.sidebar-card li a {
    display: block;
    font-size: 14px;
    color: var(--body);
    padding: 8px 0;
    line-height: 1.4;
}
.sidebar-card li a:hover { color: var(--ink); }

.toc-list { list-style: none; }
.toc-list li { padding: 4px 0; }
.toc-list a { font-size: 14px; color: var(--body); }
.toc-list a:hover { color: var(--ink); }

.references {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--hairline);
}

.references h3 { font-size: 14px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 12px; }
.references ol { margin-left: 18px; }
.references li { font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.references a { color: var(--muted); text-decoration: underline; }
.references a:hover { color: var(--ink); }

.page-content-inner {
    max-width: 800px;
    margin: 0 auto;
    padding: 48px 24px 80px;
}

.page-content-inner h2 {
    font-size: 26px;
    font-weight: 400;
    letter-spacing: -0.325px;
    color: var(--ink);
    margin-top: 40px;
    margin-bottom: 14px;
}

.page-content-inner h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    margin-top: 28px;
    margin-bottom: 10px;
}

.page-content-inner p {
    font-size: 16px;
    color: var(--body);
    line-height: 1.65;
    margin-bottom: 16px;
}

.page-content-inner ul {
    margin: 0 0 16px 20px;
}

.page-content-inner li {
    font-size: 16px;
    color: var(--body);
    line-height: 1.6;
    margin-bottom: 6px;
}

.page-content-inner strong { color: var(--ink); font-weight: 600; }

.contact-form-wrap {
    background: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-top: 48px;
}

.contact-form-wrap h2 {
    margin-top: 0;
    margin-bottom: 24px;
}

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

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

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

.form-group textarea { height: auto; min-height: 100px; resize: vertical; }

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

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

.form-group .field-error {
    font-size: 13px;
    color: var(--semantic-error);
    margin-top: 4px;
    display: none;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    padding: 0 18px;
    background: var(--primary);
    color: var(--on-primary);
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background 0.15s;
    font-family: inherit;
}

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

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

.form-message {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    display: none;
}

.form-message.success {
    background: #e8f5ef;
    color: var(--semantic-success);
    border: 1px solid #b2d8c7;
}

.disclaimer {
    background: var(--canvas-soft);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-md);
    padding: 14px 18px;
    margin: 24px 0;
}

.disclaimer p {
    font-size: 13px;
    color: var(--muted);
    margin: 0;
    line-height: 1.5;
}

.updated-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    background: var(--surface-strong);
    color: var(--muted);
    border-radius: var(--radius-pill);
    padding: 3px 10px;
    margin-bottom: 12px;
}

.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--ink);
    color: var(--canvas);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    z-index: 999;
    flex-wrap: wrap;
}

.cookie-banner p {
    font-size: 14px;
    color: var(--canvas-soft);
    margin: 0;
    flex: 1;
    min-width: 200px;
}

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

.cookie-banner-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.cookie-btn-accept {
    height: 36px;
    padding: 0 16px;
    background: var(--primary);
    color: var(--on-primary);
    font-size: 13px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: inherit;
}

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

.cookie-btn-reject {
    height: 36px;
    padding: 0 16px;
    background: transparent;
    color: var(--canvas-soft);
    font-size: 13px;
    font-weight: 500;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: inherit;
}

.cookie-btn-reject:hover { border-color: rgba(255,255,255,0.6); }

.site-footer {
    background: var(--canvas);
    border-top: 1px solid var(--hairline);
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 48px 24px 32px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 32px;
}

.footer-brand {
    font-size: 16px;
    font-weight: 600;
    color: var(--ink);
    display: block;
    margin-bottom: 10px;
}

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

.footer-heading {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--muted);
    display: block;
    margin-bottom: 14px;
}

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { font-size: 14px; color: var(--body); }
.footer-col a:hover { color: var(--ink); }

.footer-contact { font-size: 14px; color: var(--body); margin-bottom: 6px; }

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 24px 32px;
    border-top: 1px solid var(--hairline-soft);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

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

.footer-legal { display: flex; gap: 20px; }
.footer-legal a { font-size: 13px; color: var(--muted); }
.footer-legal a:hover { color: var(--ink); }

@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; gap: 32px; }
    .hero h1 { font-size: 38px; }
    .articles-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: 1fr 1fr; }
    .article-layout { grid-template-columns: 1fr; }
    .article-sidebar { position: static; }
}

@media (max-width: 768px) {
    .hero { padding: 48px 0; }
    .hero h1 { font-size: 32px; letter-spacing: -0.6px; }
    .section { padding: 48px 0; }
    .section-title { font-size: 28px; }
    .articles-grid { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr 1fr; gap: 24px; }
    .nav-links { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--canvas); border-bottom: 1px solid var(--hairline); padding: 16px; gap: 4px; }
    .nav-links.open { display: flex; }
    .nav-toggle { display: flex; }
    .page-hero h1 { font-size: 30px; }
    .article-layout { padding: 32px 24px 60px; }
}

@media (max-width: 480px) {
    .footer-inner { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; align-items: flex-start; }
    .cookie-banner { flex-direction: column; align-items: flex-start; }
}