@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-semantic-success: #1f8a65;
    --color-semantic-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;
}

*, *::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: '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: inherit;
    text-decoration: none;
}

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-color: var(--color-canvas);
    border-bottom: 1px solid var(--color-hairline);
    height: 64px;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

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

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

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

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

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

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

.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: var(--spacing-section) 0;
    border-bottom: 1px solid var(--color-hairline);
}

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

.hero__title {
    font-size: 72px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -2.16px;
    color: var(--color-ink);
    max-width: 840px;
    margin-bottom: var(--spacing-lg);
}

.hero__desc {
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-body);
    max-width: 560px;
    margin-bottom: var(--spacing-xl);
}

.hero__image {
    margin-top: var(--spacing-section);
    border-radius: var(--rounded-lg);
    border: 1px solid var(--color-hairline);
    overflow: hidden;
    max-height: 480px;
    width: 100%;
    object-fit: cover;
}

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

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

.section__title {
    font-size: 36px;
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.72px;
    color: var(--color-ink);
    margin-bottom: var(--spacing-lg);
    max-width: 680px;
}

.section__subtitle {
    font-size: 26px;
    font-weight: 400;
    line-height: 1.25;
    letter-spacing: -0.325px;
    color: var(--color-ink);
    margin-bottom: var(--spacing-base);
}

/* ARTICLE CARDS GRID */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.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: var(--spacing-lg);
}

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

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

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

.article-card__link {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-primary);
    border-bottom: 1px solid transparent;
    transition: border-color 0.15s ease;
}

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

/* MATERIAL FEATURES */
.materials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

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

.material-card__icon {
    font-size: 28px;
    margin-bottom: var(--spacing-sm);
}

.material-card__title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--spacing-xs);
}

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

/* ARTICLE SINGLE */
.article-single {
    padding: var(--spacing-section) 0;
}

.article-single__header {
    max-width: 760px;
    margin-bottom: var(--spacing-xxl);
}

.article-single__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);
    padding: 4px 10px;
    border-radius: var(--rounded-pill);
    margin-bottom: var(--spacing-base);
}

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

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

.article-single__image {
    width: 100%;
    max-height: 500px;
    object-fit: cover;
    border-radius: var(--rounded-lg);
    border: 1px solid var(--color-hairline);
    margin-bottom: var(--spacing-xxl);
}

.article-body {
    max-width: 720px;
}

.article-body 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-body h3 {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-ink);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
}

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

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

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

.article-body a {
    color: var(--color-primary);
    border-bottom: 1px solid transparent;
    transition: border-color 0.15s ease;
}

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

.article-body blockquote {
    border-left: 3px solid var(--color-hairline-strong);
    padding-left: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    color: var(--color-muted);
    font-size: 18px;
    line-height: 1.6;
    font-style: italic;
}

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

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

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

.contact-form {
    max-width: 560px;
}

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

.form-group textarea {
    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-block;
    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;
    font-family: inherit;
    transition: background-color 0.15s ease;
    line-height: 1;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

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

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

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

.form-message.success {
    background-color: #e8f5f0;
    color: var(--color-semantic-success);
    border: 1px solid #b8e0d2;
    display: block;
}

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

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

.page-header__title {
    font-size: 48px;
    font-weight: 400;
    letter-spacing: -1.2px;
    color: var(--color-ink);
    margin-bottom: var(--spacing-sm);
}

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

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

.page-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);
}

.page-content h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
}

.page-content p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-body);
    margin-bottom: var(--spacing-base);
}

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

.page-content li {
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-body);
    margin-bottom: var(--spacing-xs);
}

.page-content a {
    color: var(--color-primary);
    border-bottom: 1px solid transparent;
    transition: border-color 0.15s ease;
}

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

/* COOKIE BANNER */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: 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__text {
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-muted-soft);
    flex: 1;
    min-width: 240px;
}

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

.cookie-banner__actions {
    display: flex;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.cookie-btn {
    font-size: 13px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--rounded-md);
    border: none;
    cursor: pointer;
    font-family: inherit;
    transition: opacity 0.15s ease;
}

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

.cookie-btn--reject {
    background-color: transparent;
    color: var(--color-canvas);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.cookie-btn:hover {
    opacity: 0.85;
}

/* 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: var(--spacing-xxl);
    margin-bottom: var(--spacing-xxl);
}

.footer-brand__logo {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
    text-decoration: none;
    letter-spacing: -0.3px;
    display: block;
    margin-bottom: var(--spacing-sm);
}

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

.footer-brand__desc {
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-body);
    max-width: 260px;
}

.footer-col__title {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--spacing-base);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-col__links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

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

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

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

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

.footer-bottom__links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.footer-bottom__links a {
    font-size: 13px;
    color: var(--color-muted);
    transition: color 0.15s ease;
}

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

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

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

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

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

/* DISCLAIMER */
.disclaimer-box {
    background-color: var(--color-surface-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-md);
    padding: var(--spacing-base);
    font-size: 13px;
    color: var(--color-muted);
    line-height: 1.5;
    margin-top: var(--spacing-xxl);
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .hero__title {
        font-size: 56px;
        letter-spacing: -1.4px;
    }

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

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

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-base);
    }

    .top-nav__links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background-color: var(--color-canvas);
        border-bottom: 1px solid var(--color-hairline);
        padding: var(--spacing-base);
        gap: var(--spacing-base);
    }

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

    .top-nav {
        position: relative;
    }

    .top-nav__hamburger {
        display: flex;
    }

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

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

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

    .article-single__title {
        font-size: 32px;
        letter-spacing: -0.5px;
    }

    .page-header__title {
        font-size: 32px;
    }
}

@media (max-width: 640px) {
    .hero__title {
        font-size: 32px;
        letter-spacing: -0.5px;
    }

    .section__title {
        font-size: 26px;
        letter-spacing: -0.3px;
    }

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

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