/* ==================================================================================
   📂 ไฟล์ index.css (ระบบดีไซน์สุดพรีเมียม สไตล์ Modern Glassmorphism & Vibrant Theme)
   ================================================================================== */

:root {
    --primary: #059669; /* Emerald Green */
    --primary-hover: #047857;
    --secondary: #6366f1; /* Indigo */
    --secondary-hover: #4f46e5;
    --background: #0f172a; /* Slate Dark */
    --surface: #1e293b; /* Card Dark */
    --surface-glass: rgba(30, 41, 59, 0.7);
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.08);
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --font-sarabun: 'Sarabun', sans-serif;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.3);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--background);
    color: var(--text);
    font-family: var(--font-sarabun);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* 🌀 Background Gradients */
body::before {
    content: '';
    position: fixed;
    top: -20%;
    left: -20%;
    width: 60%;
    height: 60%;
    background: radial-gradient(circle, rgba(5, 150, 105, 0.15) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

body::after {
    content: '';
    position: fixed;
    bottom: -20%;
    right: -20%;
    width: 60%;
    height: 60%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

/* 🖼️ Layout Containers */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* 🧱 Glassmorphism Cards */
.card {
    background: var(--surface-glass);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.15);
}

/* 🏛️ Header / Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    list-style: none;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
}

/* 🔘 Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--secondary);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--secondary-hover);
    transform: translateY(-2px);
}

.btn-danger {
    background-color: var(--danger);
    color: white;
}

.btn-danger:hover {
    background-color: #dc2626;
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

/* 📝 Form Controls */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--font-sarabun);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
}

/* 📊 Tables */
.table-responsive {
    overflow-x: auto;
    margin-top: 1rem;
}

.table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.table th,
.table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

.table th {
    background-color: rgba(15, 23, 42, 0.4);
    font-weight: 700;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table tr:hover td {
    background-color: rgba(255, 255, 255, 0.02);
}

/* 🔔 Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* 📷 Camera Viewport (OMR Scanner Specific) */
#camera-container {
    position: relative;
    width: 100%;
    max-width: 480px;
    aspect-ratio: 3/4;
    margin: 0 auto;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 3px solid var(--primary);
    box-shadow: 0 0 20px rgba(5, 150, 105, 0.3);
}

#webcam {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* overlay grid sights */
.scanner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.target-sight {
    position: absolute;
    width: 40px;
    height: 40px;
    border: 4px solid var(--secondary);
    transition: var(--transition);
}

.target-top-left { top: 15%; left: 15%; border-right: none; border-bottom: none; }
.target-top-right { top: 15%; right: 15%; border-left: none; border-bottom: none; }
.target-bottom-left { bottom: 15%; left: 15%; border-right: none; border-top: none; }
.target-bottom-right { bottom: 15%; right: 15%; border-left: none; border-top: none; }

.scanning-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(to right, transparent, var(--primary), transparent);
    animation: scanAnimation 2s infinite linear;
}

@keyframes scanAnimation {
    0% { top: 0%; }
    50% { top: 100%; }
    100% { top: 0%; }
}

/* 📑 Standardized Printable Answer Sheet CSS (Used in template page) */
@media print {
    body {
        background: white !important;
        color: black !important;
    }
    .no-print {
        display: none !important;
    }
    .print-sheet {
        box-shadow: none !important;
        border: none !important;
        padding: 0 !important;
        margin: 0 !important;
    }
}