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

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

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

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

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

body {
    background-color: var(--color-canvas);
    color: var(--color-body);
    font-family: var(--font-main);
    font-size: 16px;
    font-weight: 400;
    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 NAV */
.top-nav {
    background: 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-brand {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

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

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

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

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

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

/* HERO */
.hero-band {
    padding: var(--spacing-section) 0;
    background: 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;
    color: var(--color-body);
    line-height: 1.5;
    max-width: 560px;
    margin-bottom: var(--spacing-xxl);
}

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

.badge-pill {
    display: inline-flex;
    align-items: center;
    background: var(--color-surface-strong);
    color: var(--color-ink);
    font-size: 11px;
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    border-radius: var(--rounded-pill);
    padding: 4px 10px;
}

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

.section + .section {
    border-top: 1px solid var(--color-hairline-soft);
}

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

.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-sub {
    font-size: 16px;
    color: var(--color-body);
    max-width: 560px;
    margin-bottom: var(--spacing-xxl);
}

/* CARDS */
.card-grid {
    display: grid;
    gap: var(--spacing-lg);
}

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

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

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

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

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

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

/* ARTICLE CARDS */
.article-card {
    background: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
    overflow: hidden;
    transition: border-color 0.15s;
    display: flex;
    flex-direction: column;
}

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

.article-card-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.article-card-body {
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
}

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

.article-card-meta .badge-pill {
    font-size: 10px;
}

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

.article-card h3 {
    font-size: 22px;
    font-weight: 400;
    line-height: 1.25;
    letter-spacing: -0.11px;
    color: var(--color-ink);
    margin-bottom: var(--spacing-sm);
}

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

.article-card-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-ink);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xxs);
    margin-top: auto;
    border-bottom: 1px solid var(--color-hairline);
    padding-bottom: 2px;
    transition: border-color 0.15s, color 0.15s;
    width: fit-content;
}

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

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

.article-hero-inner {
    max-width: 780px;
}

.article-hero h1 {
    font-size: 52px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -1.5px;
    color: var(--color-ink);
    margin-bottom: var(--spacing-lg);
}

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

.article-hero-img {
    margin-top: var(--spacing-xl);
    width: 100%;
    max-height: 480px;
    object-fit: cover;
    border-radius: var(--rounded-lg) var(--rounded-lg) 0 0;
}

.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: 18px;
    font-weight: 600;
    color: var(--color-ink);
    line-height: 1.4;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
}

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

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

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

.article-content a {
    color: var(--color-ink);
    border-bottom: 1px solid var(--color-hairline);
    transition: border-color 0.15s, color 0.15s;
}

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

.article-figure {
    margin: var(--spacing-xxl) 0;
    background: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
    overflow: hidden;
}

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

.article-figure figcaption {
    font-size: 13px;
    color: var(--color-muted);
    padding: var(--spacing-sm) var(--spacing-base);
    border-top: 1px solid var(--color-hairline-soft);
}

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

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

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

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

.data-table td {
    padding: var(--spacing-sm) var(--spacing-base);
    border-bottom: 1px solid var(--color-hairline-soft);
    color: var(--color-body);
    vertical-align: top;
}

.data-table tr:last-child td {
    border-bottom: none;
}

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

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

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

.sidebar-box ul {
    list-style: none;
}

.sidebar-box ul li {
    border-bottom: 1px solid var(--color-hairline-soft);
    padding: var(--spacing-sm) 0;
}

.sidebar-box ul li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.sidebar-box ul li a {
    font-size: 14px;
    color: var(--color-body);
}

.sidebar-box ul li a:hover {
    color: var(--color-ink);
}

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

/* CONTACT FORM */
.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: 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-size: 16px;
    font-family: var(--font-main);
    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(--color-ink);
}

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

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

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

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

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

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

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

.form-message.success {
    background: #f0faf5;
    color: var(--color-success);
    border: 1px solid #b8e8d4;
    display: block;
}

.form-message.loading {
    background: var(--color-surface-strong);
    color: var(--color-muted);
    border: 1px solid var(--color-hairline);
    display: block;
}

/* FOOTER */
.site-footer {
    background: 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-xl);
    margin-bottom: var(--spacing-xxl);
}

.footer-brand p {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.5;
    margin-top: var(--spacing-sm);
    max-width: 260px;
}

.footer-col h5 {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: var(--spacing-base);
}

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

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

.footer-col ul li a {
    font-size: 14px;
    color: var(--color-body);
    transition: color 0.15s;
}

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

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

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

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

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

.cookie-banner p {
    font-size: 14px;
    color: var(--color-canvas);
    line-height: 1.5;
    flex: 1;
}

.cookie-banner p a {
    color: var(--color-canvas);
    border-bottom: 1px solid rgba(247,247,244,0.4);
}

.cookie-banner-btns {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.cookie-btn-accept {
    background: var(--color-primary);
    color: var(--color-on-primary);
    border: none;
    border-radius: var(--rounded-md);
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    font-family: var(--font-main);
    cursor: pointer;
    transition: background 0.15s;
}

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

.cookie-btn-reject {
    background: transparent;
    color: var(--color-canvas);
    border: 1px solid rgba(247,247,244,0.3);
    border-radius: var(--rounded-md);
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    font-family: var(--font-main);
    cursor: pointer;
    transition: border-color 0.15s;
}

.cookie-btn-reject:hover {
    border-color: rgba(247,247,244,0.7);
}

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

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

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

.page-content {
    padding: var(--spacing-section) 0;
    max-width: 720px;
}

.page-content h2 {
    font-size: 22px;
    font-weight: 400;
    line-height: 1.25;
    letter-spacing: -0.11px;
    color: var(--color-ink);
    margin-top: var(--spacing-xxl);
    margin-bottom: var(--spacing-sm);
}

.page-content h2:first-child {
    margin-top: 0;
}

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

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

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

.update-date {
    font-size: 13px;
    color: var(--color-muted);
    margin-top: var(--spacing-xxl);
    padding-top: var(--spacing-base);
    border-top: 1px solid var(--color-hairline-soft);
}

/* BREADCRUMB */
.breadcrumb {
    padding: var(--spacing-base) 0;
    border-bottom: 1px solid var(--color-hairline-soft);
}

.breadcrumb ol {
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.breadcrumb li {
    font-size: 13px;
    color: var(--color-muted);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

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

.breadcrumb li:not(:last-child)::after {
    content: '/';
    color: var(--color-hairline-strong);
}

/* RELATED ARTICLES */
.related-section {
    padding: var(--spacing-section) 0;
    border-top: 1px solid var(--color-hairline);
}

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

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

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

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

    .article-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-canvas);
        border-bottom: 1px solid var(--color-hairline);
        flex-direction: column;
        padding: var(--spacing-base) var(--spacing-xl);
        gap: var(--spacing-base);
    }

    .nav-menu.open {
        display: flex;
    }

    .nav-hamburger {
        display: flex;
    }

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

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

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

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

    .article-hero h1 {
        font-size: 32px;
        letter-spacing: -0.8px;
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--spacing-base);
    }

    .hero-band {
        padding: var(--spacing-xxl) 0;
    }

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

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

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