/* Reset y Variables */
:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --dark: #1f2937;
    --light: #f3f4f6;
    --white: #ffffff;
    --text: #374151;
    --text-light: #6b7280;
    --border: #e5e7eb;
    --shadow: 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);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: var(--white);
    box-shadow: var(--shadow);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    margin-bottom: 1rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--text-light);
    font-size: 0.9rem;
}

.nav {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.nav-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    background: var(--light);
    color: var(--text);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

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

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

/* Main Content */
.main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

.page {
    display: none;
    animation: fadeIn 0.3s;
}

.page.active {
    display: block;
}

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

/* Sub-navegación */
.sub-nav {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    background: var(--white);
    padding: 1rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.sub-nav-btn {
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--border);
    background: var(--white);
    color: var(--text);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    flex: 1;
}

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

.sub-nav-btn.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

/* Sub-secciones */
.sub-section {
    display: none;
    animation: fadeIn 0.3s;
}

.sub-section.active {
    display: block;
}

.page-header {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.page-header h2 {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-light);
}

/* Verification Page */
.verification-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .verification-container {
        grid-template-columns: 1fr;
   }
}

.camera-section, .result-section {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

#camera-feed {
    width: 100%;
    border-radius: 8px;
    margin-bottom: 1rem;
    background: var(--dark);
}

.camera-controls {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.result-card {
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    margin-bottom: 1rem;
}

.result-card.success {
    background: #ecfdf5;
    border: 2px solid var(--success);
}

.result-card.error {
    background: #fee2e2;
    border: 2px solid var(--danger);
}

.result-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.info-card {
    padding: 1.5rem;
    background: var(--light);
    border-radius: 8px;
}

.info-card h4 {
    margin-bottom: 1rem;
    color: var(--primary);
}

.info-card ol {
    padding-left: 1.5rem;
}

.info-card li {
    margin-bottom: 0.5rem;
}

/* Register Page */
.register-container {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.register-form {
    max-width: 600px;
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

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

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.image-preview {
    margin-top: 1rem;
    max-width: 200px;
}

.image-preview img {
    width: 100%;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

/* Reports Page */
.reports-container {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.filters-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--light);
    border-radius: 8px;
}

.filters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.stats-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    padding: 1.5rem;
    border-radius: 12px;
    color: var(--white);
    text-align: center;
}

.stat-card.bg-blue { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.stat-card.bg-green { background: linear-gradient(135deg, #10b981 0%, #059669 100%); }
.stat-card.bg-red { background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%); }
.stat-card.bg-purple { background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%); }

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.table-section {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

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

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

tbody tr:hover {
    background: var(--light);
}

.text-center {
    text-align: center;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-block;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

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

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-block {
    width: 100%;
}

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

.result-message {
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
}

.result-message.success {
    background: #ecfdf5;
    color: #065f46;
    border: 1px solid var(--success);
}

.result-message.error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid var(--danger);
}

/* Footer */
.footer {
    background: var(--white);
    padding: 1.5rem 0;
    text-align: center;
    margin-top: 3rem;
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.1);
}

.footer p {
    color: var(--text-light);
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--light);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Loading Overlay */
#loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    flex-direction: column;
}

#loading-overlay h3 {
    margin-top: 1rem;
    color: var(--primary);
}