/* --- Root Variables & Theme --- */
:root {
    --primary: #38bdf8;        /* Sky Blue */
    --primary-glow: rgba(56, 189, 248, 0.4);
    --bg-dark: #0f172a;       /* Navy Slate */
    --card-glass: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --success: #4ade80;       /* Emerald */
    --danger: #f87171;        /* Red-Coral */
    --font-ui: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

/* --- Global Setup --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body.exam-body {
    background-color: var(--bg-dark);
    /* Subtle background gradient to make it look premium */
    background-image: 
        radial-gradient(at 0% 0%, hsla(253,16%,7%,1) 0, transparent 50%), 
        radial-gradient(at 50% 0%, hsla(225,39%,30%,1) 0, transparent 50%);
    color: var(--text-main);
    font-family: var(--font-ui);
    line-height: 1.6;
    min-height: 100vh;
}

/* --- Font Import (SutonnyMJ) --- */
@font-face {
    font-family: 'SutonnyMJ';
    src: url('fonts/SutonnyMJ.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

.bijoy-font {
    font-family: 'SutonnyMJ', Arial, sans-serif !important;
    font-size: 1.45rem !important; /* Larger size for better readability of Bijoy font */
    letter-spacing: 0.5px;
}

/* --- Layout Container --- */
.exam-container {
    max-width: 850px;
    margin: 0 auto;
    padding: 20px 15px;
}

/* --- Progress Bar --- */
.progress-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    margin-bottom: 30px;
    overflow: hidden;
}

#progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #38bdf8, #818cf8);
    width: 0%;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 10px var(--primary-glow);
}

/* --- Header Section --- */
.exam-top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

#exam-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

#q-meta {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.timer-box {
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.3);
    padding: 8px 15px;
    border-radius: 12px;
    text-align: center;
}

#timer {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--danger);
}

/* --- Main Card (Glassmorphism) --- */
.quiz-card {
    background: var(--card-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    padding: 35px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

#question-text {
    margin-bottom: 30px;
    line-height: 1.5;
    color: #ffffff;
}

/* --- Options Grid --- */
.options-container {
    display: grid;
    gap: 15px;
}

.opt-card {
    position: relative;
}

.opt-card input {
    position: absolute;
    opacity: 0;
}

.opt-card label {
    display: flex;
    align-items: center;
    padding: 18px 22px;
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.opt-card label:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateX(5px);
}

.opt-card input:checked + label {
    background: rgba(56, 189, 248, 0.1);
    border-color: var(--primary);
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.2);
}

.opt-letter {
    display: inline-block;
    width: 30px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    margin-right: 15px;
    font-weight: 700;
    font-family: var(--font-ui);
    font-size: 0.9rem;
}

/* --- Action Buttons --- */
.primary-btn {
    width: 100%;
    margin-top: 30px;
    padding: 18px;
    background: linear-gradient(135deg, #38bdf8 0%, #2563eb 100%);
    color: #000;
    border: none;
    border-radius: 15px;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 20px -5px rgba(37, 99, 235, 0.4);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 25px -5px rgba(37, 99, 235, 0.6);
    filter: brightness(1.1);
}

/* --- Results & Review Section --- */
.result-header {
    text-align: center;
    margin-bottom: 30px;
}

.score-circle {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary);
}

.review-item {
    background: rgba(15, 23, 42, 0.5);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 15px;
    border-left: 6px solid transparent;
}

.review-item.correct { border-left-color: var(--success); }
.review-item.wrong { border-left-color: var(--danger); }

.correct-ans-label {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--success);
    font-weight: 600;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .quiz-card { padding: 20px; }
    .gradient-text { font-size: 1.8rem; }
    .bijoy-font { font-size: 1.25rem !important; }
}