/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 70px;
    --header-height: 70px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
    color: white;
    z-index: 1000;
    transition: transform 0.3s ease, width 0.3s ease;
    overflow-y: auto;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

.sidebar-header {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar.collapsed .sidebar-header h2 {
    display: none;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.25rem;
    transition: background 0.2s;
}

.sidebar-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.sidebar-nav {
    padding: 1rem 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.nav-item.active {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border-left-color: var(--primary-color);
}

.nav-icon {
    font-size: 1.5rem;
    margin-right: 1rem;
    min-width: 24px;
}

.sidebar.collapsed .nav-text {
    display: none;
}

.sidebar.collapsed .nav-icon {
    margin-right: 0;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: margin-left 0.3s ease;
    padding: 2rem;
}

.sidebar.collapsed ~ .main-content {
    margin-left: var(--sidebar-collapsed-width);
}

/* Page Styles */
.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page-header {
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.page-header p {
    color: var(--text-secondary);
    margin-top: 0.5rem;
    width: 100%;
}

/* Scanner Styles */
.scanner-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.scanner-wrapper {
    background: var(--card-bg);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.qr-reader {
    width: 100%;
    max-width: 500px;
    margin: 0 auto 1.5rem;
    border-radius: 0.5rem;
    overflow: hidden;
}

.scanner-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.scanner-result {
    background: var(--card-bg);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.info-box {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: 0.5rem;
    border-left: 4px solid var(--primary-color);
}

/* Form Styles */
.form-container {
    max-width: 600px;
    margin: 0 auto;
}

.registration-form {
    background: var(--card-bg);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

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

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* Button Styles */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.spinner {
    display: inline-block;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Status Messages */
.status-message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 0.5rem;
    display: none;
}

.status-message.show {
    display: block;
}

.status-message.success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--success-color);
}

.status-message.error {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--error-color);
}

.status-message.info {
    background: #dbeafe;
    color: #1e40af;
    border-left: 4px solid var(--info-color);
}

/* Certificates */
.certificates-container {
    max-width: 800px;
    margin: 0 auto;
}

.certificate-bulk-section {
    background: var(--card-bg);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.certificate-bulk-section h2 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.section-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.section-divider {
    text-align: center;
    margin: 2rem 0;
    color: var(--text-secondary);
    font-weight: 600;
    position: relative;
}

.section-divider::before,
.section-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background: var(--border-color);
}

.section-divider::before {
    left: 0;
}

.section-divider::after {
    right: 0;
}

.certificate-form {
    background: var(--card-bg);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.certificate-form h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

/* Bulk Results */
.bulk-results {
    margin-top: 2rem;
}

.bulk-results-summary {
    background: var(--bg-color);
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.bulk-results-summary h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.stat-item {
    background: white;
    padding: 1rem;
    border-radius: 0.5rem;
    border-left: 4px solid var(--primary-color);
}

.stat-item.success {
    border-left-color: var(--success-color);
}

.stat-item.info {
    border-left-color: var(--info-color);
}

.stat-item.error {
    border-left-color: var(--error-color);
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.bulk-results-details {
    background: var(--bg-color);
    border-radius: 0.5rem;
    padding: 1.5rem;
}

.bulk-results-details h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.bulk-results-details ul {
    list-style: none;
    max-height: 400px;
    overflow-y: auto;
}

.result-detail {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: white;
    border-radius: 0.375rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-left: 3px solid var(--border-color);
}

.result-detail.success {
    border-left-color: var(--success-color);
}

.result-detail.error {
    border-left-color: var(--error-color);
}

.result-detail.info {
    border-left-color: var(--info-color);
}

.status-icon {
    font-weight: 700;
    font-size: 1.125rem;
}

.result-detail.success .status-icon {
    color: var(--success-color);
}

.result-detail.error .status-icon {
    color: var(--error-color);
}

.result-detail.info .status-icon {
    color: var(--info-color);
}

.detail-text {
    font-size: 0.875rem;
    color: var(--text-primary);
}

/* Settings */
.settings-container {
    max-width: 600px;
    margin: 0 auto;
}

.settings-form {
    background: var(--card-bg);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.settings-form small {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Loading */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

/* Overlay for mobile */
.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

.overlay.show {
    display: block;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .scanner-container {
        grid-template-columns: 1fr;
    }
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1001;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.2s;
}

.mobile-menu-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.mobile-menu-btn:active {
    transform: scale(0.95);
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.show {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: 1rem;
        padding-top: 4rem;
    }

    .sidebar-toggle {
        display: none;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .page-header h1 {
        font-size: 1.5rem;
    }

    .form-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .registration-form,
    .scanner-wrapper,
    .scanner-result,
    .certificate-form,
    .certificate-bulk-section,
    .settings-form {
        padding: 1rem;
    }

    .page-header h1 {
        font-size: 1.25rem;
    }
}