/* ============================================================
   DARK THEME DESIGN SYSTEM
   Shared across all quiz pages
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg:           #0F0F1A;
    --bg-card:      #1A1A2E;
    --bg-card2:     #22223A;
    --border:       rgba(255,255,255,0.08);
    --border2:      rgba(255,255,255,0.14);
    --text:         #F0EFFF;
    --text-muted:   #8A89A8;
    --primary:      #6C3CE1;
    --primary-light:#8F5FF6;
    --primary-dark: #4A2AA0;
    --success:      #10B981;
    --danger:       #EF4444;
    --warn:         #F59E0B;
    --info:         #0EA5E9;
}

html, body {
    min-height: 100vh;
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
}

/* ---- TOPBAR / NAV ---- */
.dt-nav {
    background: rgba(26,26,46,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0 1.5rem;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}
.dt-nav-logo {
    font-size: 1.2rem;
    font-weight: 900;
    color: var(--text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.dt-nav-logo img { height: 28px; }
.dt-nav-logo span { background: linear-gradient(135deg, var(--primary-light), #E84393); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.dt-nav-right { display: flex; align-items: center; gap: 0.6rem; }

/* ---- BADGES ---- */
.dt-badge {
    display: inline-flex; align-items: center; gap: 0.3rem;
    padding: 0.22rem 0.65rem; border-radius: 99px;
    font-size: 0.72rem; font-weight: 700;
}
.dt-badge-pro  { background: rgba(245,158,11,0.2); color: #FCD34D; border: 1px solid rgba(245,158,11,0.4); }
.dt-badge-free { background: rgba(255,255,255,0.06); color: var(--text-muted); border: 1px solid var(--border2); }
.dt-badge-pre  { background: rgba(14,165,233,0.2); color: #38BDF8; border: 1px solid rgba(14,165,233,0.35); }
.dt-badge-post { background: rgba(16,185,129,0.2); color: #34D399; border: 1px solid rgba(16,185,129,0.35); }

/* ---- BUTTONS ---- */
.dt-btn {
    display: inline-flex; align-items: center; gap: 0.45rem;
    padding: 0.55rem 1.1rem; border-radius: 9px;
    font-size: 0.88rem; font-weight: 700;
    border: none; cursor: pointer;
    font-family: inherit; text-decoration: none;
    transition: transform 0.15s, filter 0.15s, box-shadow 0.15s;
    white-space: nowrap;
}
.dt-btn:hover  { filter: brightness(1.12); transform: translateY(-1px); }
.dt-btn:active { transform: scale(0.97) translateY(0); }
.dt-btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: white; box-shadow: 0 4px 14px rgba(108,60,225,0.35); }
.dt-btn-success { background: linear-gradient(135deg, var(--success), #059669); color: white; box-shadow: 0 4px 14px rgba(16,185,129,0.3); }
.dt-btn-danger  { background: linear-gradient(135deg, var(--danger), #B91C1C); color: white; box-shadow: 0 4px 14px rgba(239,68,68,0.3); }
.dt-btn-ghost   { background: rgba(255,255,255,0.07); border: 1px solid var(--border2); color: var(--text-muted); }
.dt-btn-ghost:hover { background: rgba(255,255,255,0.12); color: var(--text); }
.dt-btn-lg { padding: 0.85rem 1.8rem; font-size: 1rem; border-radius: 12px; }
.dt-btn-full { width: 100%; justify-content: center; }
.dt-btn-sm { padding: 0.4rem 0.8rem; font-size: 0.8rem; border-radius: 7px; }

/* ---- CARDS ---- */
.dt-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 1.8rem;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}
.dt-card-sm { border-radius: 14px; padding: 1.2rem; }
.dt-card-title {
    font-size: 0.75rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 1.5px;
    color: var(--text-muted); margin-bottom: 1.2rem;
    display: flex; align-items: center; gap: 0.5rem;
}

/* ---- FORM ELEMENTS ---- */
.dt-label {
    display: block;
    font-size: 0.75rem; font-weight: 700;
    color: var(--text-muted); text-transform: uppercase;
    letter-spacing: 1px; margin-bottom: 0.45rem;
}
.dt-input, .dt-select {
    width: 100%;
    background: rgba(255,255,255,0.05);
    border: 1.5px solid var(--border);
    border-radius: 10px;
    padding: 0.8rem 1rem;
    font-size: 0.95rem; font-weight: 500;
    color: var(--text); font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
    -webkit-appearance: none;
}
.dt-input::placeholder { color: var(--text-muted); font-weight: 400; }
.dt-input:focus, .dt-select:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(108,60,225,0.2);
}
.dt-form-group { margin-bottom: 1.1rem; }

/* ---- ALERT / NOTICE ---- */
.dt-alert {
    padding: 0.8rem 1rem; border-radius: 10px;
    font-size: 0.88rem; font-weight: 600;
    display: flex; align-items: center; gap: 0.6rem;
    margin-bottom: 1rem;
}
.dt-alert-error  { background: rgba(239,68,68,0.15);  border: 1px solid rgba(239,68,68,0.3);  color: #F87171; }
.dt-alert-info   { background: rgba(14,165,233,0.1);  border: 1px solid rgba(14,165,233,0.3);  color: #38BDF8; }
.dt-alert-warn   { background: rgba(245,158,11,0.1);  border: 1px solid rgba(245,158,11,0.3);  color: #FCD34D; }
.dt-alert-success{ background: rgba(16,185,129,0.12); border: 1px solid rgba(16,185,129,0.35); color: #34D399; }

/* ---- TABLE ---- */
.dt-table { width: 100%; border-collapse: collapse; }
.dt-table th {
    padding: 0.9rem 1rem; text-align: left;
    font-size: 0.75rem; font-weight: 700;
    color: var(--text-muted); text-transform: uppercase;
    letter-spacing: 1px; border-bottom: 1px solid var(--border);
}
.dt-table td {
    padding: 1rem; border-bottom: 1px solid var(--border);
    font-size: 0.9rem; font-weight: 500; color: var(--text);
}
.dt-table tbody tr { transition: background 0.15s; }
.dt-table tbody tr:hover { background: rgba(255,255,255,0.03); }
.dt-table tbody tr:last-child td { border-bottom: none; }

/* ---- PAGE LAYOUT ---- */
.dt-page { max-width: 1000px; margin: 0 auto; padding: 2rem 1.5rem; }
.dt-page-sm { max-width: 480px; }
.dt-page-center { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: calc(100vh - 60px); padding: 2rem 1rem; }

/* ---- SEPARATOR ---- */
.dt-sep { border: none; border-top: 1px solid var(--border); margin: 1.5rem 0; }

/* ---- UTILITY ---- */
.dt-hidden { display: none !important; }
.dt-text-muted { color: var(--text-muted); }
.dt-text-grad { background: linear-gradient(135deg, var(--primary-light), #E84393); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

/* ---- MOBILE RESPONSIVENESS ---- */
@media (max-width: 768px) {
    /* Navbar Hamburger Setup */
    .dt-nav-right {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(26,26,46,0.98);
        backdrop-filter: blur(12px);
        padding: 1rem 1.5rem;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    }
    .dt-nav-right.active {
        display: flex;
    }
    .dt-nav-right .dt-btn {
        width: 100%;
        justify-content: center;
        margin-bottom: 0.5rem;
    }
    
    .hamburger-btn {
        display: block !important;
        background: none;
        border: none;
        color: var(--text);
        font-size: 1.5rem;
        cursor: pointer;
    }

    /* Cards & Layout */
    .dt-page { padding: 1.5rem 1rem; }
    .dt-card { padding: 1.2rem; }
    
    /* Tables */
    .dt-table { display: block; overflow-x: auto; white-space: nowrap; }

    /* Modals */
    .modal-box { width: 95%; padding: 1.5rem; }
}

@media (min-width: 769px) {
    .hamburger-btn { display: none !important; }
}