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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-body);
    background-color: var(--color-canvas);
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

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);
    position: sticky;
    top: 0;
    z-index: 100;
    height: 64px;
}

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

.top-nav__logo {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.3px;
    color: var(--color-ink);
    line-height: 1;
}

.top-nav__logo span {
    color: var(--color-primary);
}

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

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

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

.top-nav__menu a.active {
    color: var(--color-ink);
}

.top-nav__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}

.top-nav__hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-ink);
    border-radius: 1px;
    transition: all 0.2s ease;
}

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

.hero__badge {
    display: inline-flex;
    align-items: center;
    background-color: var(--color-surface-strong);
    color: var(--color-ink);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    border-radius: var(--rounded-pill);
    padding: 4px 10px;
    margin-bottom: 24px;
}

.hero__title {
    font-size: 56px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -1.5px;
    color: var(--color-ink);
    max-width: 760px;
    margin-bottom: 20px;
}

.hero__subtitle {
    font-size: 18px;
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-body);
    max-width: 580px;
    margin-bottom: 40px;
}

.hero__image {
    margin-top: 48px;
    border-radius: var(--rounded-lg);
    overflow: hidden;
    border: 1px solid var(--color-hairline);
    max-height: 480px;
}

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

/* SECTIONS */
.section {
    padding: 80px 0;
    border-bottom: 1px solid var(--color-hairline);
}

.section--alt {
    background-color: var(--color-canvas-soft);
}

.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;
    line-height: 1.2;
    letter-spacing: -0.72px;
    color: var(--color-ink);
    margin-bottom: 16px;
}

.section__desc {
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-body);
    max-width: 600px;
}

/* CARDS */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 48px;
}

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

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

.feature-card__icon {
    font-size: 24px;
    margin-bottom: 16px;
    display: block;
}

.feature-card__title {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-ink);
    margin-bottom: 8px;
}

.feature-card__text {
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-body);
}

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

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

.article-card__image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-card__body {
    padding: 20px 24px 24px;
}

.article-card__tag {
    display: inline-flex;
    align-items: center;
    background-color: var(--color-surface-strong);
    color: var(--color-muted);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    border-radius: var(--rounded-pill);
    padding: 3px 8px;
    margin-bottom: 12px;
}

.article-card__title {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-ink);
    margin-bottom: 8px;
}

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

.article-card__excerpt {
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-body);
    margin-bottom: 16px;
}

.article-card__meta {
    font-size: 13px;
    color: var(--color-muted);
    display: flex;
    align-items: center;
    gap: 8px;
}

.article-card__meta::before {
    content: '';
    display: block;
    width: 16px;
    height: 1px;
    background-color: var(--color-hairline-strong);
}

/* TYPOGRAPHY */
h1, h2, h3, h4 {
    color: var(--color-ink);
    font-weight: 400;
}

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

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

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

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

.article-hero__breadcrumb {
    font-size: 13px;
    color: var(--color-muted);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.article-hero__breadcrumb a {
    color: var(--color-muted);
    transition: color 0.15s;
}

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

.article-hero__breadcrumb span {
    color: var(--color-hairline-strong);
}

.article-hero__tag {
    display: inline-flex;
    background-color: var(--color-surface-strong);
    color: var(--color-muted);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    border-radius: var(--rounded-pill);
    padding: 3px 8px;
    margin-bottom: 16px;
}

.article-hero__title {
    font-size: 42px;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.8px;
    color: var(--color-ink);
    margin-bottom: 20px;
}

.article-hero__desc {
    font-size: 18px;
    line-height: 1.6;
    color: var(--color-body);
    margin-bottom: 32px;
}

.article-hero__meta {
    display: flex;
    align-items: center;
    gap: 24px;
    font-size: 13px;
    color: var(--color-muted);
    padding: 16px 0;
    border-top: 1px solid var(--color-hairline);
}

.article-hero__cover {
    margin-top: 48px;
    border-radius: var(--rounded-lg) var(--rounded-lg) 0 0;
    overflow: hidden;
    border: 1px solid var(--color-hairline);
    border-bottom: none;
}

.article-hero__cover img {
    width: 100%;
    height: 420px;
    object-fit: cover;
}

.article-content {
    padding: 64px 0 80px;
}

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

.article-body h2 {
    font-size: 26px;
    font-weight: 400;
    line-height: 1.25;
    letter-spacing: -0.325px;
    color: var(--color-ink);
    margin: 48px 0 16px;
}

.article-body h2:first-child {
    margin-top: 0;
}

.article-body h3 {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-ink);
    margin: 32px 0 12px;
}

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

.article-body ul, .article-body ol {
    padding-left: 24px;
    margin-bottom: 20px;
}

.article-body li {
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-body);
    margin-bottom: 8px;
}

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

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

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

.article-body .info-box {
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-left: 3px solid var(--color-primary);
    border-radius: 0 var(--rounded-md) var(--rounded-md) 0;
    padding: 16px 20px;
    margin: 24px 0;
}

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

.article-body figure {
    margin: 32px 0;
}

.article-body figure img {
    border-radius: var(--rounded-md);
    border: 1px solid var(--color-hairline);
    width: 100%;
}

.article-body figcaption {
    font-size: 13px;
    color: var(--color-muted);
    margin-top: 8px;
    line-height: 1.4;
}

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

.sidebar-box {
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
    padding: 24px;
    margin-bottom: 16px;
}

.sidebar-box__title {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: 16px;
}

.sidebar-toc {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

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

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

.sidebar-toc li.active a {
    color: var(--color-primary);
    font-weight: 500;
}

.related-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.related-links a {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-ink);
    display: flex;
    align-items: flex-start;
    gap: 8px;
    transition: color 0.15s;
}

.related-links a::before {
    content: '→';
    color: var(--color-muted-soft);
    flex-shrink: 0;
    margin-top: 1px;
}

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

/* CONTACT FORM */
.contact-section {
    padding: 80px 0;
}

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

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

.contact-info__text {
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-body);
    margin-bottom: 32px;
}

.contact-detail {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-detail__item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--color-body);
}

.contact-detail__label {
    font-weight: 500;
    color: var(--color-ink);
    min-width: 80px;
}

.form-card {
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
    padding: 32px;
}

.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,
.form-group select {
    width: 100%;
    background-color: var(--color-surface-card);
    color: var(--color-ink);
    border: 1px solid var(--color-hairline-strong);
    border-radius: var(--rounded-md);
    padding: 12px 16px;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.5;
    height: 44px;
    transition: border-color 0.15s ease;
    outline: none;
}

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

.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-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background-color: var(--color-primary);
    color: var(--color-on-primary);
    font-size: 14px;
    font-weight: 500;
    line-height: 1;
    padding: 10px 18px;
    height: 40px;
    border-radius: var(--rounded-md);
    border: none;
    cursor: pointer;
    transition: background-color 0.15s ease;
    font-family: var(--font-sans);
}

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

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

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-surface-card);
    color: var(--color-ink);
    font-size: 14px;
    font-weight: 500;
    line-height: 1;
    padding: 10px 18px;
    height: 40px;
    border-radius: var(--rounded-md);
    border: 1px solid var(--color-hairline-strong);
    cursor: pointer;
    transition: border-color 0.15s ease;
    font-family: var(--font-sans);
    text-decoration: none;
}

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

.form-success {
    display: none;
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-left: 3px solid var(--color-success);
    border-radius: 0 var(--rounded-md) var(--rounded-md) 0;
    padding: 16px 20px;
    margin-top: 20px;
}

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

.form-success p {
    font-size: 14px;
    color: var(--color-success);
    font-weight: 500;
    margin: 0;
}

/* COOKIE BANNER */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--color-ink);
    color: var(--color-canvas);
    padding: 20px 24px;
    z-index: 200;
    display: none;
    border-top: 1px solid rgba(255,255,255,0.1);
}

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

.cookie-banner__inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.cookie-banner__text {
    font-size: 14px;
    line-height: 1.5;
    color: #c8c6be;
    flex: 1;
    min-width: 280px;
}

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

.cookie-banner__actions {
    display: flex;
    gap: 12px;
    flex-shrink: 0;
}

.btn-cookie-accept {
    background-color: var(--color-primary);
    color: var(--color-on-primary);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    height: 36px;
    border-radius: var(--rounded-md);
    border: none;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: background-color 0.15s;
}

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

.btn-cookie-reject {
    background-color: transparent;
    color: #c8c6be;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    height: 36px;
    border-radius: var(--rounded-md);
    border: 1px solid rgba(255,255,255,0.2);
    cursor: pointer;
    font-family: var(--font-sans);
    transition: border-color 0.15s, color 0.15s;
}

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

/* FOOTER */
.footer {
    background-color: var(--color-canvas);
    border-top: 1px solid var(--color-hairline);
    padding: 64px 0 48px;
}

.footer__inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
}

.footer__brand {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer__logo {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-ink);
}

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

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

.footer__disclaimer {
    font-size: 12px;
    color: var(--color-muted-soft);
    line-height: 1.5;
    margin-top: 8px;
}

.footer__col-title {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.88px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: 16px;
}

.footer__links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

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

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

.footer__bottom {
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--color-hairline);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

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

.footer__bottom-links {
    display: flex;
    gap: 20px;
}

.footer__bottom-links a {
    font-size: 13px;
    color: var(--color-muted);
    transition: color 0.15s;
}

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

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

.page-hero__title {
    font-size: 42px;
    font-weight: 400;
    letter-spacing: -0.8px;
    color: var(--color-ink);
    line-height: 1.15;
    margin-bottom: 16px;
    max-width: 640px;
}

.page-hero__desc {
    font-size: 18px;
    line-height: 1.6;
    color: var(--color-body);
    max-width: 560px;
}

.page-content {
    padding: 64px 0 80px;
}

.prose h2 {
    font-size: 26px;
    font-weight: 400;
    line-height: 1.25;
    letter-spacing: -0.325px;
    color: var(--color-ink);
    margin: 48px 0 16px;
}

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

.prose h3 {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-ink);
    margin: 32px 0 12px;
}

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

.prose ul, .prose ol {
    padding-left: 24px;
    margin-bottom: 20px;
}

.prose li {
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-body);
    margin-bottom: 8px;
}

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

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

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

.prose .updated-date {
    font-size: 13px;
    color: var(--color-muted);
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* DIVIDER */
.divider {
    height: 1px;
    background-color: var(--color-hairline);
    margin: 40px 0;
}

/* BREADCRUMB */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--color-muted);
    padding: 16px 0;
    border-bottom: 1px solid var(--color-hairline);
}

.breadcrumb a {
    color: var(--color-muted);
    transition: color 0.15s;
}

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

.breadcrumb__sep {
    color: var(--color-hairline-strong);
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .hero__title {
        font-size: 46px;
    }

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

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

    .article-content__layout {
        grid-template-columns: 1fr 240px;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .top-nav__menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background-color: var(--color-canvas);
        border-bottom: 1px solid var(--color-hairline);
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 24px;
        gap: 16px;
    }

    .top-nav__menu.open {
        display: flex;
    }

    .top-nav__hamburger {
        display: flex;
    }

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

    .hero__subtitle {
        font-size: 16px;
    }

    .hero__image img {
        height: 280px;
    }

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

    .cards-grid--2col {
        grid-template-columns: 1fr;
    }

    .section__title {
        font-size: 28px;
    }

    .contact-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .footer__brand {
        grid-column: 1 / -1;
    }

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

    .article-sidebar {
        position: static;
    }

    .article-hero__title {
        font-size: 30px;
    }

    .page-hero__title {
        font-size: 30px;
    }
}

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

    .hero {
        padding: 48px 0;
    }

    .section {
        padding: 48px 0;
    }

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

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