/* ===========================================
   CodeVault BD — Premium Navy/Violet/Cyan Theme
   =========================================== */

:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #0f1729;
    --bg-card: #131b2e;
    --bg-card-hover: #182339;
    --border-color: #232f4a;

    --accent-violet: #8b5cf6;
    --accent-violet-light: #a78bfa;
    --accent-cyan: #22d3ee;
    --accent-cyan-light: #67e8f9;

    --text-primary: #e8ecf7;
    --text-secondary: #9aa5c0;
    --text-muted: #5c6584;

    --gradient-brand: linear-gradient(135deg, var(--accent-violet) 0%, var(--accent-cyan) 100%);
    --shadow-glow: 0 8px 32px rgba(139, 92, 246, 0.15);
    --radius: 14px;
}

[data-theme="light"] {
    --bg-primary: #f4f6fb;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #eef1fa;
    --border-color: #e2e6f2;
    --text-primary: #0f1729;
    --text-secondary: #4a5578;
    --text-muted: #8890ab;
    --shadow-glow: 0 8px 32px rgba(139, 92, 246, 0.10);
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

html { scroll-behavior: smooth; }

body {
    font-family: 'Segoe UI', 'Hind Siliguri', system-ui, -apple-system, sans-serif;
    background:
        radial-gradient(circle at 15% 0%, rgba(139, 92, 246, 0.10), transparent 40%),
        radial-gradient(circle at 85% 20%, rgba(34, 211, 238, 0.08), transparent 40%),
        var(--bg-primary);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    transition: background 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; display: block; }

button, input, select, textarea { font-family: inherit; }

::selection { background: var(--accent-violet); color: #fff; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}
[data-theme="light"] .site-header { background: rgba(255, 255, 255, 0.85); }

.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 16px 0; }

.brand {
    font-size: 22px;
    font-weight: 800;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

.theme-toggle {
    width: 42px; height: 42px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    font-size: 18px;
    transition: transform 0.2s ease, border-color 0.2s ease;
}
.theme-toggle:hover { transform: scale(1.08); border-color: var(--accent-violet); }

/* Hero */
.hero { text-align: center; padding: 64px 20px 40px; }
.hero h1 { font-size: 38px; font-weight: 800; margin-bottom: 14px; }
.hero .highlight {
    background: var(--gradient-brand);
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p { color: var(--text-secondary); font-size: 16px; max-width: 560px; margin: 0 auto; }

/* Search & filter */
.search-bar {
    display: flex; gap: 10px; max-width: 640px; margin: 32px auto 0; flex-wrap: wrap;
}
.search-bar input, .search-bar select {
    flex: 1; min-width: 160px;
    padding: 13px 18px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 14px;
}
.search-bar input:focus, .search-bar select:focus { outline: none; border-color: var(--accent-violet); }
.search-bar button {
    padding: 13px 26px;
    border-radius: 10px;
    border: none;
    background: var(--gradient-brand);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    font-size: 14px;
}

/* Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 22px;
    padding: 48px 0 80px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    will-change: transform;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-glow); border-color: var(--accent-violet); }
.card:active { transform: translateY(-1px); }

.card-thumb {
    height: 160px;
    background: linear-gradient(135deg, rgba(139,92,246,0.18), rgba(34,211,238,0.18));
    display: flex; align-items: center; justify-content: center;
    font-size: 40px;
    color: var(--accent-violet-light);
    overflow: hidden;
}
.card-thumb img { width: 100%; height: 100%; object-fit: cover; }

.card-body { padding: 18px 20px; }
.card-category {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--accent-cyan);
    background: rgba(34, 211, 238, 0.1);
    padding: 4px 10px;
    border-radius: 20px;
    margin-bottom: 10px;
}
.card h3 { font-size: 17px; margin-bottom: 8px; }
.card p { font-size: 13.5px; color: var(--text-secondary); margin-bottom: 14px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.card-meta { display: flex; justify-content: space-between; align-items: center; font-size: 12.5px; color: var(--text-muted); }
.card-meta .stats { display: flex; gap: 12px; }

.btn {
    display: inline-block;
    padding: 12px 22px;
    min-height: 44px;
    border-radius: 8px;
    background: var(--gradient-brand);
    color: #fff;
    font-weight: 600;
    font-size: 14px;
    border: none;
    cursor: pointer;
    text-align: center;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.25);
    transition: filter 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
}
.btn:hover { filter: brightness(1.1); box-shadow: 0 6px 22px rgba(139, 92, 246, 0.35); }
.btn:active { transform: scale(0.98); }
.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    box-shadow: none;
}
.btn-outline:hover { border-color: var(--accent-violet); box-shadow: none; }
.btn-block { width: 100%; }

.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }

/* Template detail page */
.detail-wrap { display: grid; grid-template-columns: 1.3fr 1fr; gap: 30px; padding: 40px 0 80px; align-items: start; }
@media (max-width: 900px) { .detail-wrap { grid-template-columns: 1fr; } }

.preview-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
}
.preview-box .preview-header {
    padding: 12px 18px;
    border-bottom: 1px solid var(--border-color);
    font-size: 13px;
    color: var(--text-muted);
    display: flex; gap: 6px; align-items: center;
}
.preview-box iframe { width: 100%; height: 420px; border: none; background: #fff; }

.form-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 26px;
}
.form-panel h2 { font-size: 20px; margin-bottom: 6px; }
.form-panel .sub { color: var(--text-secondary); font-size: 13.5px; margin-bottom: 20px; }

.field-group { margin-bottom: 16px; }
.field-group label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 6px; }
.field-group .req { color: var(--accent-cyan); }
.field-group input, .field-group textarea, .field-group select {
    width: 100%;
    padding: 11px 14px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
}
.field-group input:focus, .field-group textarea:focus { outline: none; border-color: var(--accent-violet); }
.field-group textarea { min-height: 90px; resize: vertical; }

/* Footer */
.site-footer { border-top: 1px solid var(--border-color); padding: 28px 0; text-align: center; color: var(--text-muted); font-size: 13px; }

/* ===========================================
   Lab BD Promotion — Top Strip
   =========================================== */
.promo-strip {
    background: var(--gradient-brand);
    position: relative;
    z-index: 90;
}
.promo-strip-inner {
    display: flex; align-items: center; justify-content: center; gap: 16px;
    padding: 10px 44px 10px 20px;
    flex-wrap: wrap;
    position: relative;
}
.promo-strip-text { color: #fff; font-size: 13.5px; font-weight: 500; text-align: center; }
.promo-strip-btn {
    background: rgba(255,255,255,0.22);
    color: #fff;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 700;
    white-space: nowrap;
    transition: background 0.2s ease;
}
.promo-strip-btn:hover { background: rgba(255,255,255,0.35); }
.promo-strip-close {
    position: absolute; right: 14px; top: 50%; transform: translateY(-50%);
    background: none; border: none; color: rgba(255,255,255,0.8);
    font-size: 14px; cursor: pointer; padding: 6px;
}
.promo-strip-close:hover { color: #fff; }
.promo-strip.hidden { display: none; }

/* ===========================================
   Lab BD Promotion — Featured Card
   =========================================== */
.promo-card {
    background: linear-gradient(160deg, rgba(139,92,246,0.10), rgba(34,211,238,0.06)), var(--bg-card);
    border: 1px solid var(--accent-violet);
    border-radius: var(--radius);
    padding: 32px;
    margin-top: 24px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.promo-card::before {
    content: '';
    position: absolute; top: -60px; right: -60px; width: 180px; height: 180px;
    background: var(--gradient-brand); opacity: 0.15; border-radius: 50%; filter: blur(10px);
}
.promo-card-badge {
    display: inline-block;
    background: rgba(139, 92, 246, 0.15);
    color: var(--accent-violet-light);
    font-size: 12px; font-weight: 700;
    padding: 5px 14px; border-radius: 20px;
    margin-bottom: 14px;
}
.promo-card-title { font-size: 22px; font-weight: 800; margin-bottom: 10px; position: relative; }
.promo-card-title .highlight {
    background: var(--gradient-brand); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.promo-card-sub { color: var(--text-secondary); font-size: 14.5px; max-width: 560px; margin: 0 auto 20px; position: relative; }

.promo-card-checklist {
    display: flex; flex-wrap: wrap; justify-content: center; gap: 10px 20px;
    margin-bottom: 22px; position: relative;
}
.promo-card-checklist span { font-size: 13px; color: var(--text-secondary); font-weight: 500; }

.promo-card-actions { display: flex; flex-direction: column; align-items: center; gap: 10px; max-width: 340px; margin: 0 auto; position: relative; }
.promo-card-actions .btn { width: 100%; }
.promo-card-link { color: var(--accent-cyan); font-size: 13.5px; font-weight: 600; }
.promo-card-link:hover { text-decoration: underline; }

/* ===========================================
   Download landing page
   =========================================== */
.download-page-wrap { max-width: 620px; margin: 0 auto; padding: 48px 0 80px; }

.download-status-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 40px 30px;
    text-align: center;
    margin-bottom: 24px;
}
.download-status-box h1 { font-size: 21px; margin-bottom: 8px; }
.download-status-box .sub { color: var(--text-secondary); font-size: 14px; margin-bottom: 22px; }

.download-spinner {
    width: 48px; height: 48px; margin: 0 auto 20px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-violet);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Admin */
.admin-layout { display: flex; min-height: 100vh; }
.admin-sidebar {
    width: 230px; background: var(--bg-secondary); border-right: 1px solid var(--border-color);
    padding: 24px 0; flex-shrink: 0;
}
.admin-sidebar .brand { padding: 0 24px 24px; display: block; }
.admin-sidebar a {
    display: block; padding: 12px 24px; color: var(--text-secondary); font-size: 14px; font-weight: 500;
}
.admin-sidebar a:hover, .admin-sidebar a.active { color: var(--text-primary); background: var(--bg-card); border-right: 3px solid var(--accent-violet); }
.admin-main { flex: 1; padding: 32px 40px; max-width: 1000px; min-width: 0; }

@media (max-width: 780px) {
    .admin-layout { flex-direction: column; }
    .admin-sidebar {
        width: 100%; display: flex; align-items: center; overflow-x: auto;
        padding: 12px 8px; border-right: none; border-bottom: 1px solid var(--border-color);
        -webkit-overflow-scrolling: touch;
    }
    .admin-sidebar .brand { padding: 0 14px; margin-right: 6px; white-space: nowrap; }
    .admin-sidebar a {
        white-space: nowrap; padding: 10px 16px; border-radius: 8px;
    }
    .admin-sidebar a:hover, .admin-sidebar a.active { border-right: none; background: var(--bg-card); }
    .admin-main { padding: 20px 16px 60px; }
}

.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.login-box {
    width: 100%; max-width: 380px; background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: var(--radius); padding: 36px;
}
.login-box h1 { text-align: center; margin-bottom: 24px; font-size: 20px; }

.alert { padding: 12px 16px; border-radius: 8px; font-size: 13.5px; margin-bottom: 18px; }
.alert-error { background: rgba(239,68,68,0.12); color: #f87171; border: 1px solid rgba(239,68,68,0.3); }
.alert-success { background: rgba(34,197,94,0.12); color: #4ade80; border: 1px solid rgba(34,197,94,0.3); }

.table-wrap { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius); overflow-x: auto; margin-top: 20px; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; min-width: 620px; }
th, td { padding: 13px 16px; text-align: left; font-size: 13.5px; border-bottom: 1px solid var(--border-color); white-space: nowrap; }
th { color: var(--text-muted); font-weight: 600; text-transform: uppercase; font-size: 11.5px; letter-spacing: 0.4px; }
tr:last-child td { border-bottom: none; }

.page-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; flex-wrap: wrap; gap: 10px; }
.page-head h1 { font-size: 24px; }

.dyn-field-row {
    display: grid; grid-template-columns: 1fr 1fr 120px 90px 36px; gap: 8px; margin-bottom: 10px; align-items: center;
}
@media (max-width: 700px) { .dyn-field-row { grid-template-columns: 1fr; } }
.dyn-field-row input, .dyn-field-row select { padding: 9px 10px; font-size: 13px; border-radius: 6px; border: 1px solid var(--border-color); background: var(--bg-primary); color: var(--text-primary); }
.remove-field-btn { background: rgba(239,68,68,0.12); color: #f87171; border: none; border-radius: 6px; height: 34px; cursor: pointer; }

.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); gap: 16px; margin: 20px 0; }
.stat-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 20px; }
.stat-card .num { font-size: 28px; font-weight: 800; background: var(--gradient-brand); -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent; }
.stat-card .label { color: var(--text-muted); font-size: 13px; margin-top: 4px; }

.badge { padding: 3px 10px; border-radius: 20px; font-size: 11.5px; font-weight: 600; }
.badge-active { background: rgba(34,197,94,0.12); color: #4ade80; }
.badge-inactive { background: rgba(239,68,68,0.12); color: #f87171; }

.action-links a { font-size: 12.5px; margin-right: 10px; color: var(--accent-cyan-light); }
.action-links a.danger { color: #f87171; }

/* ===========================================
   Mobile Responsive Breakpoints
   =========================================== */

@media (max-width: 640px) {
    .container { padding: 0 16px; }

    .header-inner { padding: 12px 0; }
    .brand { font-size: 19px; }
    .theme-toggle { width: 38px; height: 38px; font-size: 16px; }

    .hero { padding: 40px 16px 28px; }
    .hero h1 { font-size: 26px; line-height: 1.3; }
    .hero p { font-size: 14.5px; }

    .search-bar { flex-direction: column; margin-top: 24px; }
    .search-bar input, .search-bar select, .search-bar button { width: 100%; min-width: 0; }
    .search-bar button { padding: 13px; }

    .grid { grid-template-columns: 1fr; gap: 16px; padding: 32px 0 56px; }
    .card-thumb { height: 140px; }

    .detail-wrap { padding: 24px 0 56px; gap: 18px; }
    .preview-box iframe { height: 280px; }
    .form-panel { padding: 20px; }
    .form-panel h2 { font-size: 18px; }

    .login-box { padding: 26px 22px; margin: 0 16px; }

    .page-head { flex-direction: column; align-items: stretch; }
    .page-head h1 { font-size: 20px; }
    .page-head .btn { text-align: center; }

    .stat-cards { grid-template-columns: repeat(3, 1fr); gap: 10px; }
    .stat-card { padding: 14px 10px; }
    .stat-card .num { font-size: 20px; }
    .stat-card .label { font-size: 11px; }

    .action-links { display: flex; flex-wrap: wrap; gap: 6px; }
    .action-links a { margin-right: 0; }

    .promo-strip-inner { padding: 10px 40px 10px 14px; gap: 8px; }
    .promo-strip-text { font-size: 12.5px; text-align: left; }
    .promo-strip-btn { padding: 5px 12px; font-size: 12px; }

    .promo-card { padding: 22px 18px; }
    .promo-card-title { font-size: 18px; }
    .promo-card-checklist { flex-direction: column; gap: 8px; }

    .download-status-box { padding: 30px 20px; }
}

@media (max-width: 380px) {
    .hero h1 { font-size: 22px; }
    .stat-cards { grid-template-columns: 1fr 1fr; }
    .stat-cards .stat-card:last-child { grid-column: span 2; }
}

/* বড় টাচ টার্গেট - মোবাইলে ফর্ম ফিল্ড এবং বাটন সহজে ট্যাপ করার জন্য */
@media (hover: none) and (pointer: coarse) {
    .field-group input, .field-group textarea, .field-group select { min-height: 46px; }
    .btn, .theme-toggle, .action-links a { min-height: 40px; display: inline-flex; align-items: center; justify-content: center; }
    .action-links a { padding: 6px 4px; }
}