:root {
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    
    --accent-primary: #3b82f6;
    --accent-primary-hover: #2563eb;
    
    --accent-success: #10b981;
    --accent-success-hover: #059669;
    
    --accent-danger: #ef4444;
    --accent-danger-hover: #dc2626;

    --border-color: rgba(255, 255, 255, 0.1);
    
    --radius-lg: 16px;
    --radius-md: 8px;
    --radius-sm: 4px;

    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.2);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.08), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.08), transparent 25%);
}

.app-container {
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

header {
    text-align: center;
    padding: 1rem 0;
}

.header-icon {
    width: 48px;
    height: 48px;
    color: var(--accent-primary);
    margin-bottom: 1rem;
    filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.5));
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-muted);
}

/* Cards */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.card-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.card-header i {
    color: var(--accent-primary);
}

/* Upload Section */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 2.5rem 1rem;
    text-align: center;
    transition: all 0.2s ease;
    background-color: rgba(255, 255, 255, 0.02);
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--accent-primary);
    background-color: rgba(59, 130, 246, 0.05);
}

.upload-icon {
    width: 40px;
    height: 40px;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.upload-area p {
    margin-bottom: 1.5rem;
    color: var(--text-muted);
}

.upload-area strong {
    color: var(--text-main);
}

.status-msg {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--accent-success);
    font-weight: 500;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    font-family: inherit;
}

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

.btn-primary:hover {
    background-color: var(--accent-primary-hover);
    box-shadow: var(--shadow-glow);
}

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

.btn-success:hover {
    background-color: var(--accent-success-hover);
}

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

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

.btn-secondary {
    background-color: var(--bg-card-hover);
    color: var(--text-main);
    width: 100%;
}

.btn-secondary:hover {
    background-color: #475569;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Scanner Section */
.scanner-section.disabled {
    opacity: 0.6;
    pointer-events: none;
}

#reader-container {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background-color: #000;
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
}

#reader {
    width: 100%;
    height: 100%;
}

#reader video {
    object-fit: cover !important;
}

.scanner-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(15, 23, 42, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: opacity 0.3s ease;
}

.scanner-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.scanner-overlay p {
    color: var(--text-main);
    font-weight: 500;
    padding: 0.5rem 1rem;
    background-color: rgba(0, 0, 0, 0.5);
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.scanner-controls {
    margin-top: 1.5rem;
    display: flex;
    justify-content: center;
}

/* Results Section */
.qr-data-card {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.qr-item {
    background-color: rgba(255, 255, 255, 0.03);
    padding: 1rem;
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid var(--border-color);
}

.qr-item .label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}

.qr-item .value {
    display: block;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-primary);
}

.db-result-card {
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
}

.student-detail-row {
    display: flex;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.student-detail-row:last-child {
    border-bottom: none;
}

.student-detail-row .detail-key {
    flex: 1;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.student-detail-row .detail-value {
    flex: 2;
    font-weight: 500;
    text-align: right;
}

.not-found {
    text-align: center;
    color: var(--accent-danger);
    padding: 2rem 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

/* Utilities */
.hidden {
    display: none !important;
}

.mt-4 {
    margin-top: 1rem;
}

/* Manual Lookup Section */
.manual-lookup-section.disabled {
    opacity: 0.6;
    pointer-events: none;
}

.manual-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.manual-input-group label {
    font-weight: 500;
    color: var(--text-main);
    font-size: 0.95rem;
}

.input-wrapper {
    display: flex;
    gap: 0.75rem;
}

.manual-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.manual-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    background-color: rgba(59, 130, 246, 0.05);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.manual-input::placeholder {
    color: var(--text-muted);
}

footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: auto;
    padding-top: 2rem;
}