@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-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;
}

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

body {
    background-color: var(--color-canvas);
    color: var(--color-body);
    font-family: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-ink);
    text-decoration: underline;
    text-underline-offset: 2px;
}

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

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

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

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

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

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

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

.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;
    line-height: 1.4;
    transition: color 0.15s ease;
}

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

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

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

.mobile-nav {
    display: none;
    background-color: var(--color-canvas);
    border-bottom: 1px solid var(--color-hairline);
    padding: 16px 0;
}

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

.mobile-nav ul {
    list-style: none;
    padding: 0 24px;
}

.mobile-nav ul li a {
    display: block;
    padding: 10px 0;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-body);
    text-decoration: none;
    border-bottom: 1px solid var(--color-hairline-soft);
}

/* HERO */
.hero {
    padding: 80px 0 64px;
    background-color: var(--color-canvas);
}

.hero-label {
    display: inline-block;
    background-color: 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(--rounded-pill);
    margin-bottom: 20px;
}

.hero h1 {
    font-size: 72px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -2.16px;
    color: var(--color-ink);
    max-width: 760px;
    margin-bottom: 20px;
}

.hero-sub {
    font-size: 18px;
    color: var(--color-body);
    max-width: 580px;
    line-height: 1.5;
    margin-bottom: 32px;
}

.hero-meta {
    font-size: 13px;
    color: var(--color-muted);
    margin-bottom: 40px;
}

.hero-image-wrap {
    margin-top: 48px;
    border-radius: var(--rounded-lg);
    overflow: hidden;
    border: 1px solid var(--color-hairline);
    max-height: 440px;
}

.hero-image-wrap img {
    width: 100%;
    height: 440px;
    object-fit: cover;
}

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

/* CHECKLIST SECTION */
.checklist-section {
    padding: 80px 0;
    border-top: 1px solid var(--color-hairline);
}

.checklist-section h2 {
    font-size: 36px;
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.72px;
    color: var(--color-ink);
    margin-bottom: 16px;
}

.checklist-section .section-intro {
    font-size: 16px;
    color: var(--color-body);
    max-width: 640px;
    margin-bottom: 48px;
}

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

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

.checklist-card-icon {
    font-size: 24px;
    margin-bottom: 16px;
}

.checklist-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 12px;
    line-height: 1.3;
}

.checklist-card p {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.5;
    margin-bottom: 16px;
}

.checklist-items {
    list-style: none;
    padding: 0;
}

.checklist-items li {
    font-size: 13px;
    color: var(--color-body);
    padding: 6px 0;
    border-bottom: 1px solid var(--color-hairline-soft);
    display: flex;
    align-items: flex-start;
    gap: 8px;
    line-height: 1.4;
}

.checklist-items li:last-child {
    border-bottom: none;
}

.checklist-items li::before {
    content: '→';
    color: var(--color-muted);
    flex-shrink: 0;
    font-size: 12px;
    margin-top: 1px;
}

/* ARTICLES SECTION */
.articles-section {
    padding: 80px 0;
    border-top: 1px solid var(--color-hairline);
}

.articles-section h2 {
    font-size: 36px;
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.72px;
    color: var(--color-ink);
    margin-bottom: 40px;
}

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

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

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

.article-card-image {
    height: 180px;
    overflow: hidden;
}

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

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

.article-card-body {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

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

.article-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    line-height: 1.35;
    margin-bottom: 8px;
}

.article-card p {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.5;
    flex: 1;
}

.article-card-date {
    font-size: 13px;
    color: var(--color-muted);
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--color-hairline-soft);
}

/* CONTACT FORM SECTION */
.contact-section {
    padding: 80px 0;
    border-top: 1px solid var(--color-hairline);
}

.contact-section h2 {
    font-size: 36px;
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.72px;
    color: var(--color-ink);
    margin-bottom: 12px;
}

.contact-intro {
    font-size: 16px;
    color: var(--color-body);
    max-width: 520px;
    margin-bottom: 40px;
}

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

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

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

.form-group input,
.form-group textarea {
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline-strong);
    border-radius: var(--rounded-md);
    padding: 12px 16px;
    font-size: 15px;
    font-family: inherit;
    color: var(--color-ink);
    outline: none;
    transition: border-color 0.15s ease;
    height: 44px;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-muted-soft);
}

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

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

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

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

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

.form-message {
    display: none;
    padding: 12px 16px;
    border-radius: var(--rounded-md);
    font-size: 14px;
    font-weight: 500;
}

.form-message.success {
    display: block;
    background-color: #e8f5f0;
    color: var(--color-success);
    border: 1px solid #b8dfd3;
}

.form-message.error {
    display: block;
    background-color: #fde8ec;
    color: var(--color-error);
    border: 1px solid #f5c0cb;
}

.contact-info {
    padding-top: 8px;
}

.contact-info h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 16px;
}

.contact-info p {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.6;
    margin-bottom: 12px;
}

.contact-disclaimer {
    font-size: 12px;
    color: var(--color-muted);
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--color-hairline-soft);
    line-height: 1.5;
}

/* FOOTER */
.site-footer {
    background-color: var(--color-canvas);
    border-top: 1px solid var(--color-hairline);
    padding: 48px 0 32px;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.6;
    margin-top: 10px;
    max-width: 280px;
}

.footer-col h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: 0.3px;
    margin-bottom: 14px;
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 0.88px;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-col ul li a {
    font-size: 14px;
    color: var(--color-body);
    text-decoration: none;
    transition: color 0.15s ease;
}

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

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 24px;
    border-top: 1px solid var(--color-hairline);
    font-size: 13px;
    color: var(--color-muted);
}

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

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

/* COOKIE BANNER */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--color-ink);
    color: var(--color-canvas);
    padding: 16px 24px;
    z-index: 999;
    display: none;
}

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

.cookie-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.cookie-inner p {
    flex: 1;
    font-size: 14px;
    color: var(--color-canvas-soft);
    line-height: 1.5;
    min-width: 240px;
}

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

.cookie-buttons {
    display: flex;
    gap: 10px;
    flex-shrink: 0;
}

.btn-cookie-accept {
    background-color: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--rounded-md);
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
}

.btn-cookie-reject {
    background-color: transparent;
    color: var(--color-canvas-soft);
    border: 1px solid rgba(255,255,255,0.25);
    border-radius: var(--rounded-md);
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
}

.btn-cookie-reject:hover {
    border-color: rgba(255,255,255,0.5);
}

/* ARTICLE PAGE */
.article-hero {
    padding: 48px 0 0;
}

.article-hero-image {
    margin-top: 32px;
    border-radius: var(--rounded-lg);
    overflow: hidden;
    border: 1px solid var(--color-hairline);
    max-height: 400px;
}

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

.article-breadcrumb {
    font-size: 13px;
    color: var(--color-muted);
    margin-bottom: 20px;
}

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

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

.article-breadcrumb span {
    margin: 0 6px;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.article-meta .meta-tag {
    display: inline-block;
    background-color: 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(--rounded-pill);
}

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

.article-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 48px;
    padding: 48px 0 80px;
    align-items: start;
}

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

.article-content h1 {
    font-size: 40px;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.72px;
    color: var(--color-ink);
    margin-bottom: 20px;
}

.article-content h2 {
    font-size: 26px;
    font-weight: 400;
    line-height: 1.25;
    letter-spacing: -0.325px;
    color: var(--color-ink);
    margin: 36px 0 14px;
}

.article-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-ink);
    margin: 28px 0 10px;
}

.article-content p {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.65;
    margin-bottom: 18px;
}

.article-content ul,
.article-content ol {
    margin: 0 0 18px 20px;
}

.article-content ul li,
.article-content ol li {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.65;
    margin-bottom: 6px;
}

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

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

.tip-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: 16px 20px;
    margin: 24px 0;
}

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

.tip-box strong {
    color: var(--color-ink);
}

.info-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    margin: 24px 0;
}

.info-table th {
    background-color: var(--color-surface-card);
    color: var(--color-ink);
    font-weight: 600;
    padding: 10px 14px;
    text-align: left;
    border: 1px solid var(--color-hairline);
}

.info-table td {
    padding: 10px 14px;
    border: 1px solid var(--color-hairline);
    color: var(--color-body);
    vertical-align: top;
}

.info-table tr:nth-child(even) td {
    background-color: var(--color-canvas-soft);
}

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

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

.sidebar-widget h4 {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: 14px;
}

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

.toc-list li {
    padding: 6px 0;
    border-bottom: 1px solid var(--color-hairline-soft);
}

.toc-list li:last-child {
    border-bottom: none;
}

.toc-list a {
    font-size: 14px;
    color: var(--color-body);
    text-decoration: none;
    display: block;
    line-height: 1.4;
}

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

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

.related-links li {
    padding: 6px 0;
    border-bottom: 1px solid var(--color-hairline-soft);
}

.related-links li:last-child {
    border-bottom: none;
}

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

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

/* PAGE */
.page-hero {
    padding: 56px 0 40px;
}

.page-hero h1 {
    font-size: 48px;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.72px;
    color: var(--color-ink);
    margin-bottom: 16px;
}

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

.page-content {
    padding: 0 0 80px;
}

.page-content h2 {
    font-size: 26px;
    font-weight: 400;
    letter-spacing: -0.325px;
    color: var(--color-ink);
    margin: 36px 0 12px;
}

.page-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-ink);
    margin: 24px 0 8px;
}

.page-content p {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.65;
    margin-bottom: 16px;
    max-width: 720px;
}

.page-content ul, .page-content ol {
    margin: 0 0 16px 20px;
    max-width: 720px;
}

.page-content li {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.65;
    margin-bottom: 6px;
}

.page-divider {
    border: none;
    border-top: 1px solid var(--color-hairline);
    margin: 40px 0;
}

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

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

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

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

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

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

    .article-sidebar {
        position: static;
    }
}

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

    .nav-hamburger {
        display: flex;
    }

    .hero h1 {
        font-size: 36px;
        letter-spacing: -0.8px;
    }

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

    .hero-image-wrap img {
        height: 240px;
    }

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

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

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }

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

    .article-content h2 {
        font-size: 22px;
    }

    .page-hero h1 {
        font-size: 32px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 48px 0 40px;
    }

    .hero h1 {
        font-size: 30px;
    }

    .checklist-section,
    .articles-section,
    .contact-section {
        padding: 56px 0;
    }
}