/* ============================================
   ultrabyte.dk front page (static).
   Tokens, navbar and project cards are copied from UltraProject's app.css — keep them in step.
   ============================================ */

:root {
    --nav-bg: linear-gradient(90deg, #1a1a2e 0%, #16213e 100%);
    --brand: #FFC107;
    --accent: #4a90d9;
    --accent-hover: #3a7bc8;
    --accent-light: rgba(74, 144, 217, 0.1);

    --body-bg: #f4f6f9;
    --content-bg: #ffffff;
    --text-primary: #2d3436;
    --text-secondary: #636e72;
    --border-color: #e3e5ec;

    --success: #27ae60;
    --warning: #f39c12;
    --danger: #e74c3c;

    --border-radius: 8px;
    --border-radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);

    --bs-primary: #4a90d9;
    --bs-primary-rgb: 74, 144, 217;
    --bs-link-color: #3a7bc8;
    --bs-link-color-rgb: 58, 123, 200;
    --bs-link-hover-color: #2b65a8;
    --bs-body-bg: var(--body-bg);
    --bs-body-color: var(--text-primary);
    --bs-border-color: var(--border-color);
}

[data-bs-theme="dark"] {
    --body-bg: #1a1a2e;
    --content-bg: #242440;
    --text-primary: #e4e4ec;
    --text-secondary: #a8a8b8;
    --border-color: #3a3a52;
    --accent-light: rgba(74, 144, 217, 0.16);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);

    --bs-body-bg: var(--body-bg);
    --bs-body-color: var(--text-primary);
    --bs-secondary-color: var(--text-secondary);
    --bs-border-color: var(--border-color);
    --bs-tertiary-bg: #2a2a48;
    --bs-secondary-bg: #2a2a48;
    --bs-link-color: #7fb3ea;
    --bs-link-color-rgb: 127, 179, 234;
    --bs-link-hover-color: #a5caf1;
}

[data-bs-theme="dark"] .form-control,
[data-bs-theme="dark"] .form-select,
[data-bs-theme="dark"] .input-group-text {
    background-color: #2a2a48;
    border-color: var(--border-color);
    color: var(--text-primary);
}
[data-bs-theme="dark"] .dropdown-menu { --bs-dropdown-bg: #2a2a48; --bs-dropdown-border-color: var(--border-color); }
[data-bs-theme="dark"] .list-group { --bs-list-group-bg: transparent; --bs-list-group-border-color: var(--border-color); }
[data-bs-theme="dark"] .text-secondary { color: var(--text-secondary) !important; }

html, body {
    background: var(--body-bg);
    color: var(--text-primary);
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
}

.btn-primary {
    --bs-btn-bg: var(--accent);
    --bs-btn-border-color: var(--accent);
    --bs-btn-hover-bg: var(--accent-hover);
    --bs-btn-hover-border-color: var(--accent-hover);
    --bs-btn-active-bg: var(--accent-hover);
    --bs-btn-active-border-color: var(--accent-hover);
    --bs-btn-disabled-bg: var(--accent);
    --bs-btn-disabled-border-color: var(--accent);
}
.btn-outline-primary {
    --bs-btn-color: var(--accent);
    --bs-btn-border-color: var(--accent);
    --bs-btn-hover-bg: var(--accent);
    --bs-btn-hover-border-color: var(--accent);
    --bs-btn-active-bg: var(--accent);
}
.nav-pills { --bs-nav-pills-link-active-bg: var(--accent); }

.min-w-0 { min-width: 0; }

/* --- Layout --- */
body { min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1 0 auto; }
.site-main { flex: 1 0 auto; }

.site-nav {
    background: var(--nav-bg);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1020;
}
.site-nav .navbar-brand { font-weight: 400; letter-spacing: .02em; }
.site-nav .nav-link { color: #c8c8d4; }
.site-nav .nav-link:hover, .site-nav .nav-link.active { color: #fff; }
.site-nav .theme-toggle { text-decoration: none; }
.brand-glyph { color: var(--brand); }

.site-footer {
    border-top: 1px solid var(--border-color);
    padding: 1.25rem 0;
    font-size: .875rem;
    color: var(--text-secondary);
}
.site-footer a { color: inherit; }

/* --- Front page --- */
.hero {
    padding: 4.5rem 0 3.5rem;
    background:
        radial-gradient(1200px 400px at 10% -10%, rgba(74, 144, 217, .18), transparent 60%),
        radial-gradient(800px 300px at 100% 0%, rgba(255, 193, 7, .10), transparent 60%);
}
.hero-kicker {
    display: inline-block;
    font-size: .8rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: .75rem;
}
.hero-title { font-size: clamp(2.2rem, 5vw, 3.4rem); font-weight: 700; letter-spacing: -.02em; margin-bottom: 1rem; }
.hero-lead { font-size: 1.15rem; color: var(--text-secondary); max-width: 38rem; margin-bottom: 1.75rem; }
.hero-art { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; max-width: 360px; margin-left: auto; }
.hero-tile {
    aspect-ratio: 1;
    border-radius: var(--border-radius-lg);
    background: var(--content-bg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    color: var(--accent);
}
.hero-tile:nth-child(even) { color: var(--brand); }

.section-title { font-size: 1.35rem; font-weight: 650; margin-bottom: 1.25rem; }

.area-card {
    background: var(--content-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
}
.area-icon {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 10px;
    background: var(--accent-light);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: .75rem;
}

.cta-card {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.75rem;
    border-radius: var(--border-radius-lg);
    background: var(--nav-bg);
    color: #e4e4ec;
    text-decoration: none;
    box-shadow: var(--shadow-lg);
    transition: transform .15s ease, box-shadow .15s ease;
}
.cta-card:hover { transform: translateY(-2px); color: #fff; box-shadow: 0 12px 32px rgba(0, 0, 0, .25); }
.cta-card p { color: #c8c8d4; }
.cta-icon {
    flex: 0 0 auto;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 14px;
    background: rgba(255, 193, 7, .15);
    color: var(--brand);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}
.cta-arrow { font-size: 2rem; color: var(--brand); }

@media (max-width: 768px) {
    .hero { padding: 2.5rem 0 2rem; }
    .cta-card { flex-direction: column; align-items: flex-start; }
    .cta-arrow { display: none; }
}

/* --- Project card --- */
.project-card {
    display: flex;
    flex-direction: column;
    background: var(--content-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    text-decoration: none;
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.project-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--accent); color: var(--text-primary); }
.project-card-cover { position: relative; aspect-ratio: 16 / 10; background: var(--accent-light); overflow: hidden; }
.project-card-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s ease; }
.project-card:hover .project-card-cover img { transform: scale(1.04); }
.project-card-placeholder { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; font-size: 3rem; color: var(--accent); }
.project-card-status { position: absolute; top: .6rem; left: .6rem; }
.project-card-body { padding: 1rem 1rem .5rem; flex: 1; }
.project-card-title { font-size: 1.05rem; font-weight: 650; margin-bottom: .35rem; }
.project-card-summary {
    font-size: .875rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: .6rem;
}
.project-card-cats { display: flex; flex-wrap: wrap; gap: .3rem; }
.project-card-footer {
    display: flex;
    justify-content: space-between;
    padding: .65rem 1rem;
    border-top: 1px solid var(--border-color);
    font-size: .8rem;
    color: var(--text-secondary);
}

.cat-chip {
    display: inline-flex;
    align-items: center;
    gap: .3rem;
    font-size: .75rem;
    padding: .15rem .55rem;
    border-radius: 999px;
    background: var(--accent-light);
    color: var(--accent);
    text-decoration: none;
    white-space: nowrap;
}
[data-bs-theme="dark"] .cat-chip { color: #8fbdee; }
a.cat-chip:hover { background: var(--accent); color: #fff; }

.difficulty { font-weight: 600; }
.difficulty-beginner { color: var(--success); }
.difficulty-intermediate { color: var(--warning); }
.difficulty-advanced { color: var(--danger); }