@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;
    --font-sans: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --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 {
    font-family: var(--font-sans);
    background-color: var(--color-canvas);
    color: var(--color-body);
    font-size: 16px;
    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 24px;
}

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

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

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

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

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

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

/* HERO */
.hero {
    padding: 80px 0;
    background-color: var(--color-canvas);
    border-bottom: 1px solid var(--color-hairline-soft);
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.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);
    border-radius: var(--radius-pill);
    padding: 4px 10px;
    margin-bottom: 20px;
}

.hero h1 {
    font-size: 48px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -1.2px;
    color: var(--color-ink);
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.6;
    margin-bottom: 32px;
    max-width: 460px;
}

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

.hero-image img {
    width: 100%;
    height: 340px;
    object-fit: cover;
}

/* SECTION */
.section {
    padding: 80px 0;
}

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

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

.section-sub {
    font-size: 16px;
    color: var(--color-body);
    max-width: 580px;
    line-height: 1.6;
}

.section-header {
    margin-bottom: 48px;
}

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

/* CARDS GRID */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

.card {
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: border-color 0.15s ease;
}

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

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.card-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);
    border-radius: var(--radius-pill);
    padding: 3px 8px;
    margin-bottom: 12px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    line-height: 1.4;
    margin-bottom: 10px;
}

.card-title a {
    color: var(--color-ink);
}

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

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

.card-meta {
    font-size: 13px;
    color: var(--color-muted);
    display: flex;
    align-items: center;
    gap: 12px;
}

.card-meta-dot {
    width: 3px;
    height: 3px;
    background-color: var(--color-muted-soft);
    border-radius: 50%;
}

/* ARTICLE LINK */
.article-link {
    display: flex;
    gap: 24px;
    padding: 24px 0;
    border-bottom: 1px solid var(--color-hairline-soft);
    align-items: flex-start;
}

.article-link:last-child {
    border-bottom: none;
}

.article-link-image {
    width: 160px;
    height: 110px;
    object-fit: cover;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.article-link-body {
    flex: 1;
}

.article-link-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);
    border-radius: var(--radius-pill);
    padding: 3px 8px;
    margin-bottom: 8px;
}

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

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

.article-link-title a:hover {
    color: var(--color-primary);
}

.article-link-excerpt {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.5;
    margin-bottom: 10px;
}

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

/* ARTICLE PAGE */
.article-header {
    padding: 64px 0 48px;
    border-bottom: 1px solid var(--color-hairline-soft);
    margin-bottom: 48px;
}

.article-header .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);
    border-radius: var(--radius-pill);
    padding: 4px 10px;
    margin-bottom: 20px;
}

.article-header h1 {
    font-size: 40px;
    font-weight: 400;
    letter-spacing: -0.8px;
    color: var(--color-ink);
    line-height: 1.2;
    margin-bottom: 20px;
    max-width: 780px;
}

.article-header .article-meta {
    font-size: 14px;
    color: var(--color-muted);
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.article-hero-image {
    width: 100%;
    max-height: 460px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    margin-bottom: 48px;
    border: 1px solid var(--color-hairline);
}

.article-body {
    max-width: 760px;
}

.article-body h2 {
    font-size: 26px;
    font-weight: 400;
    letter-spacing: -0.325px;
    color: var(--color-ink);
    line-height: 1.25;
    margin: 40px 0 16px;
}

.article-body h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-ink);
    line-height: 1.3;
    margin: 28px 0 12px;
}

.article-body p {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.7;
    margin-bottom: 20px;
}

.article-body ul, .article-body ol {
    margin: 0 0 20px 24px;
}

.article-body li {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.7;
    margin-bottom: 6px;
}

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

.article-body a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.article-body blockquote {
    border-left: 3px solid var(--color-primary);
    padding: 12px 20px;
    margin: 24px 0;
    background-color: var(--color-surface-card);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.article-body blockquote p {
    color: var(--color-body-strong);
    font-style: italic;
    margin-bottom: 0;
}

.article-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 64px;
    align-items: flex-start;
}

.article-sidebar {
    position: sticky;
    top: 88px;
}

.sidebar-block {
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
}

.sidebar-block-title {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: 16px;
}

.sidebar-links {
    list-style: none;
}

.sidebar-links li {
    padding: 8px 0;
    border-bottom: 1px solid var(--color-hairline-soft);
}

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

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

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

/* INFO BOX */
.info-box {
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin: 32px 0;
}

.info-box-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-box ul {
    margin: 0;
    padding-left: 20px;
}

.info-box li {
    font-size: 15px;
    color: var(--color-body);
    line-height: 1.6;
    margin-bottom: 4px;
}

/* FORM */
.contact-form-wrap {
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    padding: 40px;
    max-width: 600px;
}

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

.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);
    border: 1px solid var(--color-hairline-strong);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    font-size: 16px;
    font-family: var(--font-sans);
    color: var(--color-ink);
    height: 44px;
    transition: border-color 0.15s ease;
    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.error,
.form-group textarea.error {
    border-color: var(--color-error);
}

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

.form-error.visible {
    display: block;
}

.btn-submit {
    background-color: var(--color-ink);
    color: var(--color-canvas);
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    padding: 12px 24px;
    height: 44px;
    cursor: pointer;
    transition: opacity 0.15s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-submit:hover {
    opacity: 0.88;
}

.btn-submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.form-success {
    display: none;
    background-color: #e8f5f1;
    border: 1px solid #b3ddd1;
    border-radius: var(--radius-md);
    padding: 16px 20px;
    font-size: 15px;
    color: var(--color-success);
    margin-top: 16px;
}

.form-success.visible {
    display: block;
}

/* DIVIDER */
.divider {
    border: none;
    border-top: 1px solid var(--color-hairline);
    margin: 48px 0;
}

/* BREADCRUMB */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--color-muted);
    margin-bottom: 24px;
}

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

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

.breadcrumb-sep {
    color: var(--color-muted-soft);
}

/* 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 1fr;
    gap: 40px;
    margin-bottom: 48px;
}

.footer-brand {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 12px;
}

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

.footer-tagline {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.6;
    max-width: 240px;
    margin-bottom: 20px;
}

.footer-col-title {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: 16px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

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

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

.footer-bottom {
    border-top: 1px solid var(--color-hairline-soft);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

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

.footer-legal {
    display: flex;
    gap: 20px;
}

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

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

/* COOKIE BANNER */
#cookie-banner {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 48px);
    max-width: 640px;
    background-color: var(--color-ink);
    color: var(--color-canvas);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    z-index: 999;
    box-shadow: 0 4px 24px rgba(38,37,30,0.18);
}

#cookie-banner.hidden {
    display: none;
}

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

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

.cookie-buttons {
    display: flex;
    gap: 10px;
    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-soft);
    border: 1px solid rgba(255,255,255,0.25);
    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(255,255,255,0.5);
}

/* PAGE HEADER */
.page-header {
    padding: 64px 0 48px;
    border-bottom: 1px solid var(--color-hairline-soft);
    margin-bottom: 48px;
}

.page-header h1 {
    font-size: 40px;
    font-weight: 400;
    letter-spacing: -0.8px;
    color: var(--color-ink);
    line-height: 1.2;
    margin-bottom: 12px;
}

.page-header p {
    font-size: 16px;
    color: var(--color-body);
    max-width: 560px;
    line-height: 1.6;
}

.page-updated {
    font-size: 13px;
    color: var(--color-muted);
    margin-top: 10px;
}

/* PROSE */
.prose h2 {
    font-size: 24px;
    font-weight: 400;
    letter-spacing: -0.3px;
    color: var(--color-ink);
    margin: 40px 0 14px;
}

.prose h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    margin: 28px 0 10px;
}

.prose p {
    font-size: 16px;
    color: var(--color-body);
    line-height: 1.7;
    margin-bottom: 18px;
}

.prose ul, .prose ol {
    margin: 0 0 18px 24px;
}

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

.prose a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

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

/* TOPIC BAND */
.topics-band {
    background-color: var(--color-surface-card);
    border-top: 1px solid var(--color-hairline-soft);
    border-bottom: 1px solid var(--color-hairline-soft);
    padding: 48px 0;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.topic-card {
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
}

.topic-icon {
    font-size: 24px;
    margin-bottom: 12px;
}

.topic-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 6px;
}

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

/* REFERENCE SECTION */
.references {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--color-hairline);
}

.references-title {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: 16px;
}

.references ol {
    padding-left: 20px;
}

.references li {
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.6;
    margin-bottom: 8px;
}

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

/* SPINNER */
.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(247,247,244,0.3);
    border-top-color: var(--color-canvas);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    display: inline-block;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .hero h1 { font-size: 40px; }
    .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
    .footer-grid > div:first-child { grid-column: 1 / -1; }
    .article-layout { grid-template-columns: 1fr; }
    .article-sidebar { position: static; }
    .topics-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .hero-inner { grid-template-columns: 1fr; gap: 40px; }
    .hero h1 { font-size: 34px; }
    .section-title { font-size: 28px; }
    .cards-grid { grid-template-columns: 1fr; }
    .cards-grid--2 { grid-template-columns: 1fr; }
    .nav-menu { display: none; }
    .nav-menu.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background-color: var(--color-canvas);
        border-bottom: 1px solid var(--color-hairline);
        padding: 20px 24px;
        gap: 0;
    }
    .nav-menu.open li {
        border-bottom: 1px solid var(--color-hairline-soft);
    }
    .nav-menu.open a {
        display: block;
        padding: 12px 0;
    }
    .nav-hamburger { display: flex; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .footer-grid > div:first-child { grid-column: 1 / -1; }
    .article-link { flex-direction: column; }
    .article-link-image { width: 100%; height: 180px; }
    .topics-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-form-wrap { padding: 24px; }
    #cookie-banner { flex-direction: column; align-items: flex-start; gap: 16px; }
    .footer-bottom { flex-direction: column; align-items: flex-start; }
    .article-header h1 { font-size: 30px; }
    .page-header h1 { font-size: 30px; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 28px; }
    .footer-grid { grid-template-columns: 1fr; }
    .topics-grid { grid-template-columns: 1fr; }
}