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

:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --danger-color: #e74c3c;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --border-color: #ddd;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --text-color: #333;
}

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

/* Screens */
.screen {
    display: none;
}

.screen.active {
    display: block;
}

/* Login Screen */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-box h1 {
    margin-bottom: 10px;
    color: var(--dark-color);
    font-size: 2rem;
}

.subtitle {
    color: #777;
    margin-bottom: 30px;
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

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

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    width: 100%;
}

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.4);
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.error-message {
    color: var(--danger-color);
    margin-top: 15px;
    font-size: 0.9rem;
    display: none;
}

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

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

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    color: var(--dark-color);
    font-size: 1.5rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.username {
    font-weight: 600;
    color: var(--dark-color);
}

/* Tabs */
.tabs {
    background: white;
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 15px 20px;
    border: none;
    background: transparent;
    font-size: 1rem;
    font-weight: 600;
    color: #777;
    cursor: pointer;
    transition: all 0.3s;
    border-bottom: 3px solid transparent;
}

.tab-btn:hover {
    color: var(--primary-color);
    background: #f8f9fa;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Content */
.content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 30px;
    background: white;
    min-height: calc(100vh - 200px);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
    gap: 15px;
}

.section-header h2 {
    color: var(--dark-color);
    font-size: 1.8rem;
}

.badge {
    background: var(--secondary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-weight: 600;
}

.filters {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.date-input {
    padding: 8px 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
}

/* Active Rooms */
.rooms-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
}

.room-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.room-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.room-card.active {
    border-color: var(--secondary-color);
    background: linear-gradient(135deg, #f5fffa 0%, #e8f8f5 100%);
}

.room-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.room-name {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--dark-color);
    word-break: break-word;
}

.status-badge {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-badge.active {
    background: var(--secondary-color);
    color: white;
}

.room-info {
    margin-top: 15px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--light-color);
}

.info-label {
    color: #777;
    font-size: 0.9rem;
}

.info-value {
    font-weight: 600;
    color: var(--dark-color);
}

.info-value.highlight {
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: #999;
    font-size: 1.1rem;
}

/* Table */
.table-container {
    overflow-x: auto;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.data-table thead {
    background: var(--dark-color);
    color: white;
}

.data-table th,
.data-table td {
    padding: 15px;
    text-align: left;
}

.data-table tbody tr {
    border-bottom: 1px solid var(--border-color);
    transition: background 0.2s;
}

.data-table tbody tr:hover {
    background: #f8f9fa;
}

.data-table td.loading,
.data-table td.empty {
    text-align: center;
    color: #999;
    padding: 40px;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.stat-icon {
    font-size: 3rem;
}

.stat-info {
    flex: 1;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 5px;
}

.stat-label {
    color: #777;
    font-size: 0.9rem;
}

.chart-container {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    box-shadow: var(--shadow);
}

.chart-container h3 {
    margin-bottom: 20px;
    color: var(--dark-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 2px solid var(--border-color);
}

.modal-header h3 {
    color: var(--dark-color);
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: #999;
    transition: color 0.3s;
}

.modal-close:hover {
    color: var(--danger-color);
}

.modal-body {
    padding: 20px;
    max-height: calc(80vh - 80px);
    overflow-y: auto;
}

.participant-item {
    display: flex;
    justify-content: space-between;
    padding: 15px;
    border-bottom: 1px solid var(--light-color);
}

.participant-item:last-child {
    border-bottom: none;
}

.participant-name {
    font-weight: 600;
    color: var(--dark-color);
}

.participant-time {
    color: #777;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
    }

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

    .rooms-container {
        grid-template-columns: 1fr;
    }

    .tabs {
        overflow-x: auto;
    }

    .tab-btn {
        font-size: 0.9rem;
        padding: 12px 15px;
    }
}

/* Loading spinner */
.loading {
    position: relative;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-left: 10px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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


/* Estilos para Moderador */
.participant-item.moderator {
    border-left: 4px solid #f59e0b;
    background: linear-gradient(to right, #fef3c7 0%, #ffffff 10%);
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.15);
}

.moderator-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 8px;
    box-shadow: 0 2px 4px rgba(245, 158, 11, 0.3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.moderator-badge::before {
    content: '👑';
    font-size: 0.9rem;
}

.participant-item.moderator .participant-name {
    font-weight: 600;
    color: #d97706;
}

.participant-item.moderator:hover {
    background: linear-gradient(to right, #fde68a 0%, #fefce8 10%);
    border-left-color: #d97706;
}