/* --- CORE VARIABLES & THEME --- */
:root {
    --neon-purple: #bc6ff1;
    --dark-bg: #000000;
    --card-bg: #0a0a0a;
    --border-dim: rgba(188, 111, 241, 0.2);
}

body { 
    background: var(--dark-bg); 
    color: white; 
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; 
    margin: 0; 
    min-height: 100vh; 
}

/* --- UI COMPONENTS --- */

/* Navbar */
.navbar { 
    background: rgba(10, 10, 10, 0.95) !important; 
    border-bottom: 1px solid #222; 
    padding: 15px 0;
}
.navbar-brand { 
    color: white !important; 
    font-weight: 800; 
    letter-spacing: 3px; 
    text-transform: uppercase; 
    font-size: 0.85rem; 
}
.brand-accent { color: var(--neon-purple); }

/* iOS-style Bento Cards */
.bento-card, .card { 
    background: var(--card-bg); 
    border: 1px solid var(--border-dim); 
    border-radius: 25px; 
    transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: white;
    padding: 2rem;
}
.bento-card:hover, .card:hover { 
    transform: translateY(-4px); 
    box-shadow: 0 8px 25px rgba(188, 111, 241, 0.1); 
    border-color: var(--neon-purple);
}

/* Action Buttons */
.btn-mses, .btn-purple { 
    background: rgba(188, 111, 241, 0.05); 
    border: 1px solid var(--neon-purple); 
    color: var(--neon-purple); 
    border-radius: 12px; 
    font-weight: 600;
    padding: 10px 20px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 1px;
}
.btn-mses:hover, .btn-purple:hover { 
    background: var(--neon-purple); 
    color: black; 
    box-shadow: 0 0 20px rgba(188, 111, 241, 0.4); 
}

/* Helper Classes */
.text-neon, .text-purple { color: var(--neon-purple) !important; }
.smallest { font-size: 0.75rem; opacity: 0.8; }
.task-dot {
    width: 12px;
    height: 12px;
    border: 2px solid var(--neon-purple);
    border-radius: 3px;
    margin-right: 12px;
}

/* --- FLASHCARD ENGINE ADDITIONS --- */

/* Navigation Arrows */
.nav-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(188, 71, 254, 0.1);
    border: 1px solid rgba(188, 71, 254, 0.4);
    color: white;
    font-size: 2.5rem;
    padding: 10px 25px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 100;
    backdrop-filter: blur(5px);
}
.nav-arrow:hover { 
    background: rgba(188, 71, 254, 0.3);
    box-shadow: 0 0 15px rgba(188, 71, 254, 0.5);
}
.nav-arrow.left { left: -90px; }
.nav-arrow.right { right: -90px; }

/* 3D Flip Mechanics */
.flashcard-main {
    perspective: 1000px;
    height: 450px;
    background: transparent !important;
    border: none !important;
    cursor: pointer;
}
.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}
.is-flipped .card-inner { transform: rotateY(180deg); }

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 25px;
    background: #0d0d0d;
    border: 2px solid #bc47fe;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.card-back { 
    transform: rotateY(180deg); 
    background: #050505;
}

/* Traffic Light Scoring Pills */
.score-pill {
    border: none;
    border-radius: 50px;
    padding: 10px 24px;
    font-size: 0.75rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    transition: all 0.2s ease;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0,0,0,0.4);
}
.score-pill:hover {
    transform: translateY(-3px) scale(1.05);
    filter: brightness(1.2);
}

/* Specific Pill Colors */
.bg-danger { background-color: #ff4d4d !important; color: white; }
.bg-warning { background-color: #ffcc00 !important; color: #111; }
.bg-success { background-color: #00ff88 !important; color: #111; }

/* Batch Navigation Pills */
.btn-pill {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(188, 71, 254, 0.3);
    color: white;
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: bold;
    transition: 0.3s;
}
.btn-pill.active {
    background: #bc47fe;
    color: white;
    box-shadow: 0 0 10px #bc47fe;
}