/* ===================================================
   TELETRAAN - Optimus Systems Learning Platform
   Inspired by Teletraan-1, Autobots & Optimus Prime
   =================================================== */

/* -- Google Font matching the Optimus Systems logo -- */
@import url('https://fonts.googleapis.com/css2?family=Rajdhani:wght@400;500;600;700&family=Share+Tech+Mono&display=swap');

:root {
    /* Optimus Systems brand teal */
    --teletraan-cyan: #2BA6B3;
    --teletraan-cyan-bright: #00E5FF;
    --teletraan-cyan-dim: #1a7a85;
    --teletraan-cyan-rgb: 43, 166, 179;

    /* Autobot red */
    --autobot-red: #E53935;
    --autobot-red-dim: #b71c1c;
    --autobot-red-rgb: 229, 57, 53;

    /* Terminal / Teletraan-1 backgrounds */
    --teletraan-bg-deep: #060d17;
    --teletraan-bg: #0b1426;
    --teletraan-surface: #111d33;
    --teletraan-surface-hover: #162544;
    --teletraan-border: #1c3050;
    --teletraan-border-glow: rgba(43, 166, 179, 0.25);

    /* Text */
    --teletraan-text: #c8d6e5;
    --teletraan-text-bright: #e8f0fe;
    --teletraan-text-dim: #5a7a96;

    /* Energon / XP */
    --xp-color: var(--teletraan-cyan-bright);
    --heart-color: var(--autobot-red);
    --streak-color: #FFB300;

    /* Legacy compat */
    --accent: var(--teletraan-cyan);
    --accent-light: var(--teletraan-cyan-bright);
}

/* ---- Dark theme (default Teletraan-1 terminal) ---- */
[data-bs-theme="dark"] {
    --bs-body-bg: var(--teletraan-bg);
    --bs-body-color: var(--teletraan-text);
    --bs-tertiary-bg: var(--teletraan-surface);
    --bs-secondary-bg: var(--teletraan-surface-hover);
    --bs-border-color: var(--teletraan-border);
    --bs-primary: var(--teletraan-cyan);
    --bs-primary-rgb: var(--teletraan-cyan-rgb);
    --bs-danger: var(--autobot-red);
    --bs-danger-rgb: var(--autobot-red-rgb);
}

/* ---- Light theme (Autobot datapad) ---- */
[data-bs-theme="light"] {
    --teletraan-bg: #f0f4f8;
    --teletraan-surface: #ffffff;
    --teletraan-surface-hover: #e8edf3;
    --teletraan-border: #c8d6e5;
    --teletraan-text: #1a2744;
    --teletraan-text-bright: #0b1426;
    --teletraan-text-dim: #5a7a96;
    --bs-primary: var(--teletraan-cyan-dim);
    --bs-danger: var(--autobot-red);
}

/* ---- Global ---- */
body {
    font-family: 'Rajdhani', 'Segoe UI', system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    background: var(--teletraan-bg);
    color: var(--teletraan-text);
    letter-spacing: 0.01em;
}

/* ---- Navbar ---- */
#main-navbar {
    background: var(--teletraan-bg-deep);
    border-bottom: 1px solid var(--teletraan-border) !important;
    backdrop-filter: blur(12px);
    z-index: 1030;
}
[data-bs-theme="light"] #main-navbar {
    background: #ffffff;
}

/* Teletraan-1 hexagonal icon */
.teletraan-icon {
    display: inline-block;
    width: 28px;
    height: 24px;
    background: var(--teletraan-cyan);
    clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
    position: relative;
    box-shadow: 0 0 8px rgba(43, 166, 179, 0.4);
}
.teletraan-icon::after {
    content: '';
    position: absolute;
    top: 3px; left: 3px; right: 3px; bottom: 3px;
    background: var(--teletraan-bg-deep);
    clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
}

.brand-text {
    font-family: 'Rajdhani', sans-serif;
    font-weight: 700;
    font-size: 1.3rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--teletraan-cyan-bright), var(--teletraan-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-link {
    font-family: 'Rajdhani', sans-serif;
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    transition: color 0.2s;
}
.nav-link:hover {
    color: var(--teletraan-cyan) !important;
}

/* ---- Hearts ---- */
.hearts-display {
    display: flex;
    align-items: center;
    gap: 3px;
}
.hearts-display .heart {
    color: var(--heart-color);
    font-size: 1rem;
    transition: transform 0.2s;
    filter: drop-shadow(0 0 2px rgba(229, 57, 53, 0.4));
}
.hearts-display .heart.empty {
    opacity: 0.2;
    filter: none;
}
.heart-timer {
    font-family: 'Share Tech Mono', monospace;
    font-variant-numeric: tabular-nums;
    font-size: 0.7rem;
    color: var(--autobot-red);
    opacity: 0.8;
}
.hearts-display .heart.shake {
    animation: heartShake 0.4s ease-in-out;
}
@keyframes heartShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-3px) rotate(-5deg); }
    75% { transform: translateX(3px) rotate(5deg); }
}

/* ---- XP Bar ---- */
.xp-display {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
}
.xp-bar {
    width: 80px;
    height: 6px;
    background: var(--teletraan-surface);
    border-radius: 3px;
    overflow: hidden;
    border: 1px solid var(--teletraan-border);
}
.xp-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--teletraan-cyan-dim), var(--teletraan-cyan-bright));
    border-radius: 3px;
    transition: width 0.5s ease;
    box-shadow: 0 0 6px rgba(0, 229, 255, 0.4);
}
#xp-level {
    background: var(--teletraan-cyan) !important;
    font-family: 'Rajdhani', sans-serif;
    font-weight: 700;
    letter-spacing: 0.05em;
}

/* ---- Streak ---- */
.streak-display {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.85rem;
}
.streak-display .bi-fire { color: var(--streak-color); }
.streak-count { font-weight: 600; }

/* ---- Stat cards ---- */
.stat-card {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    background: var(--teletraan-surface);
    border: 1px solid var(--teletraan-border);
}
.stat-value {
    font-family: 'Rajdhani', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--teletraan-text-bright);
}
.stat-label {
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--teletraan-text-dim);
    letter-spacing: 0.08em;
}

/* ---- Cards (global) ---- */
.card {
    background: var(--teletraan-surface) !important;
    border: 1px solid var(--teletraan-border) !important;
    border-radius: 0.5rem;
}
.card[onclick], .lesson-card[onclick] {
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.card[onclick]:hover, .lesson-card[onclick]:hover {
    transform: translateY(-2px);
    border-color: var(--teletraan-cyan) !important;
    box-shadow: 0 4px 20px rgba(43, 166, 179, 0.12),
                0 0 1px rgba(43, 166, 179, 0.3);
}

/* ---- Code blocks ---- */
.code-block {
    border-radius: 0.5rem;
    overflow: hidden;
    border: 1px solid var(--teletraan-border);
}
.code-block .code-header {
    padding: 0.35rem 0.75rem;
    background: var(--teletraan-bg-deep);
    border-bottom: 1px solid var(--teletraan-border);
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.75rem;
    color: var(--teletraan-cyan);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.code-block pre {
    margin: 0;
    padding: 0.75rem;
    font-size: 0.85rem;
    font-family: 'Share Tech Mono', monospace;
    background: var(--teletraan-surface);
    color: var(--teletraan-text-bright);
}
.code-context {
    background: var(--teletraan-surface);
    border: 1px solid var(--teletraan-border);
    border-radius: 0.375rem;
    font-size: 0.85rem;
    font-family: 'Share Tech Mono', monospace;
    overflow-x: auto;
}
.output-pre {
    background: var(--teletraan-bg-deep);
    border: 1px solid var(--teletraan-border);
    border-radius: 0.375rem;
    padding: 0.5rem;
    font-size: 0.85rem;
    font-family: 'Share Tech Mono', monospace;
    white-space: pre-wrap;
    word-break: break-word;
    color: var(--teletraan-cyan-bright);
}
.code-editor {
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.85rem;
    resize: vertical;
}

/* ---- Celebration overlay ---- */
.celebration-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(6, 13, 23, 0.85);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}
.celebration-overlay.d-none { display: none !important; }
.celebration-content {
    background: var(--teletraan-surface);
    border: 1px solid var(--teletraan-cyan);
    box-shadow: 0 0 40px rgba(43, 166, 179, 0.2),
                0 0 80px rgba(43, 166, 179, 0.05);
    padding: 2rem 3rem;
    border-radius: 1rem;
    max-width: 400px;
    animation: celebrationPop 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.celebration-icon { font-size: 3rem; }
.celebration-xp {
    font-family: 'Rajdhani', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--teletraan-cyan-bright);
    text-shadow: 0 0 10px rgba(0, 229, 255, 0.5);
}

@keyframes celebrationPop {
    from { transform: scale(0.5); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

/* ---- Achievement toast ---- */
.achievement-toast-container {
    position: fixed;
    top: 70px;
    right: 1rem;
    z-index: 2000;
}
.achievement-toast {
    animation: slideInRight 0.5s ease;
    border-left: 3px solid var(--teletraan-cyan) !important;
}
@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ---- Module icons ---- */
.module-icon { font-size: 1.5rem; }
.module-icon-lg { font-size: 2.5rem; }

/* ---- Buttons ---- */
.btn-primary {
    background: var(--teletraan-cyan) !important;
    border-color: var(--teletraan-cyan) !important;
    color: #fff !important;
    font-family: 'Rajdhani', sans-serif;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.btn-primary:hover {
    background: var(--teletraan-cyan-dim) !important;
    border-color: var(--teletraan-cyan-dim) !important;
    box-shadow: 0 0 12px rgba(43, 166, 179, 0.3);
}
.btn-outline-primary {
    color: var(--teletraan-cyan) !important;
    border-color: var(--teletraan-cyan) !important;
    font-family: 'Rajdhani', sans-serif;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.btn-outline-primary:hover {
    background: var(--teletraan-cyan) !important;
    color: #fff !important;
}
.btn-danger {
    background: var(--autobot-red) !important;
    border-color: var(--autobot-red) !important;
}
.btn-danger:hover {
    background: var(--autobot-red-dim) !important;
    box-shadow: 0 0 12px rgba(229, 57, 53, 0.3);
}

/* ---- Badge ---- */
.badge.bg-primary {
    background: var(--teletraan-cyan) !important;
}
.badge.bg-danger {
    background: var(--autobot-red) !important;
}

/* ---- Headings ---- */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Rajdhani', sans-serif;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--teletraan-text-bright);
}

/* ---- Scanline overlay (subtle Teletraan-1 CRT effect) ---- */
[data-bs-theme="dark"] body::after {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none;
    z-index: 9997;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 229, 255, 0.008) 2px,
        rgba(0, 229, 255, 0.008) 4px
    );
}

/* ---- Mobile ---- */
@media (max-width: 768px) {
    .xp-bar { width: 50px; }
    .stat-card { padding: 0.35rem 0.5rem; }
    .stat-value { font-size: 1rem; }
    main.container-fluid { padding-left: 0.75rem !important; padding-right: 0.75rem !important; }
    .brand-text { font-size: 1rem; letter-spacing: 0.08em; }
}

/* ---- Scrollbar (dark mode) ---- */
[data-bs-theme="dark"] ::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
[data-bs-theme="dark"] ::-webkit-scrollbar-track {
    background: var(--teletraan-bg-deep);
}
[data-bs-theme="dark"] ::-webkit-scrollbar-thumb {
    background: var(--teletraan-border);
    border-radius: 4px;
}
[data-bs-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    background: var(--teletraan-cyan-dim);
}

/* ---- Theme toggle ---- */
[data-bs-theme="dark"] #theme-icon-dark { display: inline-block !important; }
[data-bs-theme="dark"] #theme-icon-light { display: none !important; }
[data-bs-theme="light"] #theme-icon-dark { display: none !important; }
[data-bs-theme="light"] #theme-icon-light { display: inline-block !important; }

/* ---- Focus (accessibility) ---- */
:focus-visible {
    outline: 2px solid var(--teletraan-cyan);
    outline-offset: 2px;
}

/* ---- Selection ---- */
::selection {
    background: rgba(43, 166, 179, 0.3);
    color: var(--teletraan-text-bright);
}