/* ============================================
   ENTANGLEUP - Components
   Header, Footer, Navigation, Cards, Tabs, etc.
   ============================================ */

/* ── Header ── */
header {
    background: var(--md-sys-color-surface);
    padding: 16px 0;
    border-bottom: 1px solid var(--md-sys-color-surface-variant);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

/* ── Logo ── */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--md-sys-color-on-surface);
    flex-shrink: 0;
}

.logo-svg {
    display: block;
    width: auto;
    height: 48px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    font-family: 'Inter', system-ui, sans-serif;
    color: #1c1b1f;
}

.logo-text span {
    color: var(--md-sys-color-primary);
}

.header-tagline {
    font-size: 0.75rem;
    color: var(--md-sys-color-on-surface-variant);
    font-weight: 300;
    display: block;
    margin-top: -2px;
}

/* ── Main Navigation ── */
.main-nav ul {
    display: flex;
    gap: 24px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.main-nav a {
    color: var(--md-sys-color-on-surface);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 8px 4px;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s, color 0.2s;
}

.main-nav a:hover,
.main-nav a:focus {
    border-bottom-color: var(--md-sys-color-primary);
}

.main-nav a[aria-current="page"] {
    color: var(--md-sys-color-primary);
    border-bottom-color: var(--md-sys-color-primary);
}

/* ── Breadcrumb ── */
.breadcrumb {
    padding: 8px 0 16px 0;
    margin-bottom: 8px;
}

.breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 0;
    margin: 0;
    list-style: none;
    counter-reset: none;
}

.breadcrumb li {
    display: inline;
    list-style: none;
}

.breadcrumb li::before {
    content: none;
    display: none;
}

.breadcrumb li + li::before {
    content: "/";
    margin-right: 8px;
    color: var(--md-sys-color-on-surface-variant);
    display: inline;
}

.breadcrumb a {
    color: var(--md-sys-color-primary);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
    color: var(--md-sys-color-on-surface-variant);
    font-weight: 500;
}

/* ── Tabs ── */
.tabs-container {
    background: var(--md-sys-color-surface);
    border-radius: var(--md-sys-shape-corner-large);
    box-shadow: var(--md-sys-elevation-level1);
    padding: 8px;
    margin-bottom: 32px;
    display: flex;
    gap: 8px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border: 1px solid var(--md-sys-color-surface-variant);
}

.tab {
    padding: 12px 20px;
    border-radius: var(--md-sys-shape-corner-medium);
    border: none;
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'Inter', system-ui, sans-serif;
}

.tab:hover {
    background: var(--md-sys-color-surface-variant);
}

.tab.active {
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
}

.tab .material-icons {
    font-size: 1.125rem;
}

/* ── Cards ── */
.card {
    background: var(--md-sys-color-surface);
    border-radius: var(--md-sys-shape-corner-large);
    padding: 28px 24px;
    box-shadow: var(--md-sys-elevation-level1);
    border: 1px solid var(--md-sys-color-surface-variant);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--md-sys-elevation-level2);
    border-color: var(--md-sys-color-primary);
}

.card-icon {
    font-size: 2.2rem;
    color: var(--md-sys-color-primary);
    margin-bottom: 12px;
}

.card-icon .material-icons {
    font-size: 2.2rem;
}

.card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.card p {
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.95rem;
    flex-grow: 1;
    margin-bottom: 16px;
}

.card .meta {
    font-size: 0.75rem;
    color: var(--md-sys-color-primary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.card .meta .material-icons {
    font-size: 0.9rem;
}

/* ── Cards Grid ── */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

/* ── Category Badge ── */
.category-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: var(--md-sys-shape-corner-extra-small);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
    align-self: flex-start;
}

.category-data-engineering {
    background: #e8f5e9;
    color: #2e7d32;
}

.category-ai {
    background: #f3e5f5;
    color: #7b1fa2;
}

.category-bi {
    background: #e3f2fd;
    color: #1565c0;
}

.category-coding {
    background: #fff3e0;
    color: #e65100;
}

/* ── Code Block ── */
.code-block {
    background: #0f172a;
    border-radius: 12px;
    padding: 24px;
    overflow-x: auto;
    margin: 24px 0 8px;
    border: 1px solid #1e293b;
}

.code-block pre {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
    color: #93c5fd;
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-word;
}

.code-block .comment {
    color: #6b7b8d;
}
.code-block .keyword {
    color: #c084fc;
}
.code-block .string {
    color: #6ee7b7;
}
.code-block .func {
    color: #fcd34d;
}
.code-block .class {
    color: #67e8f9;
}

/* ── Footer ── */
footer {
    background: var(--md-sys-color-surface);
    border-top: 1px solid var(--md-sys-color-surface-variant);
    padding: 32px 0;
    margin-top: 48px;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 16px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 32px;
    flex-wrap: wrap;
}

.footer-left {
    flex: 1;
    min-width: 200px;
}

.footer-logo-link {
    text-decoration: none;
    color: inherit;
    display: inline-block;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo .logo-svg {
    height: 32px;
}

.footer-logo .logo-text {
    font-size: 1.25rem;
}

.footer-tagline {
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.875rem;
    font-weight: 300;
    margin-bottom: 12px;
}

.footer-disclaimer-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--md-sys-color-primary);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    padding: 4px 8px;
    border-radius: var(--md-sys-shape-corner-small);
    background: transparent;
    border: none;
    font-family: 'Inter', system-ui, sans-serif;
}

.footer-disclaimer-link:hover {
    background: var(--md-sys-color-surface-variant);
}

.footer-disclaimer-link .material-icons {
    font-size: 0.9rem;
}

.footer-right {
    text-align: right;
    min-width: 180px;
}

.footer-creator {
    font-size: 0.875rem;
    color: var(--md-sys-color-on-surface);
    font-weight: 500;
    margin-bottom: 8px;
}

.footer-copyright {
    font-size: 0.8125rem;
    color: var(--md-sys-color-on-surface-variant);
    line-height: 1.5;
}

.footer-portfolio {
    margin-top: 12px;
}

.footer-portfolio a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--md-sys-color-primary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    padding: 6px 12px;
    border-radius: var(--md-sys-shape-corner-small);
}

.footer-portfolio a:hover {
    background: var(--md-sys-color-surface-variant);
}

.footer-portfolio .material-icons {
    font-size: 1rem;
}

/* ── Responsive Components ── */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .logo {
        flex-direction: column;
    }

    .logo-svg {
        height: 40px;
    }

    .main-nav ul {
        gap: 16px;
        justify-content: center;
        flex-wrap: wrap;
    }

    .footer-content {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }

    .footer-left {
        text-align: center;
    }

    .footer-logo {
        justify-content: center;
    }

    .footer-right {
        text-align: center;
    }

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

@media (max-width: 480px) {
    .main-nav ul {
        gap: 12px;
    }

    .main-nav a {
        font-size: 0.8rem;
        padding: 6px 2px;
    }

    .tab {
        padding: 10px 16px;
        font-size: 0.8rem;
    }
}