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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.screen {
    min-height: 100vh;
}

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

/* Login Screen */
#loginScreen .container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.card {
    background: white;
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 450px;
}

#dashboardScreen .card {
    max-width: 100%;
    margin-bottom: 20px;
}

.card h1 {
    color: #667eea;
    text-align: center;
    margin-bottom: 10px;
    font-size: 28px;
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    border: 2px solid #e0e0e0;
    background: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: #666;
    transition: all 0.3s;
}

.tab-btn:hover {
    border-color: #667eea;
    color: #667eea;
}

.tab-btn.active {
    background: #667eea;
    border-color: #667eea;
    color: white;
}

/* Forms */
.form-container {
    margin-top: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
    font-size: 14px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 15px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.form-group textarea {
    resize: vertical;
    font-family: inherit;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-block;
}

.btn-primary {
    background: #667eea;
    color: white;
    width: 100%;
}

.btn-primary:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #e0e0e0;
    color: #333;
}

.btn-secondary:hover {
    background: #d0d0d0;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 14px;
    width: auto;
}

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.form-actions .btn {
    flex: 1;
}

/* Navbar */
.navbar {
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-content h1 {
    color: #667eea;
    font-size: 24px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.user-email {
    color: #666;
    font-weight: 500;
}

/* Dashboard */
#dashboardScreen {
    background: #f5f5f5;
}

.card h2 {
    color: #333;
    margin-bottom: 20px;
    font-size: 22px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.card-header h2 {
    margin-bottom: 0;
}

/* Profile Info */
.profile-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.profile-item {
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.profile-item label {
    font-size: 12px;
    color: #666;
    text-transform: uppercase;
    font-weight: 600;
    display: block;
    margin-bottom: 5px;
}

.profile-item .value {
    font-size: 18px;
    color: #333;
    font-weight: 600;
}

/* Metrics Table */
.metrics-grid {
    display: grid;
    gap: 15px;
}

.metric-card {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
    border-left: 4px solid #667eea;
}

.metric-date {
    font-weight: 700;
    color: #667eea;
    font-size: 16px;
    margin-bottom: 15px;
}

.metric-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
}

.metric-detail {
    display: flex;
    flex-direction: column;
}

.metric-detail label {
    font-size: 11px;
    color: #666;
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 4px;
}

.metric-detail .value {
    font-size: 20px;
    color: #333;
    font-weight: 700;
}

.metric-notes {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #e0e0e0;
    color: #666;
    font-style: italic;
}

/* Messages */
.error-message {
    color: #dc3545;
    background: #fee;
    padding: 12px;
    border-radius: 8px;
    margin-top: 15px;
    display: none;
    font-size: 14px;
}

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

.success-message {
    color: #28a745;
    background: #efe;
    padding: 12px;
    border-radius: 8px;
    margin-top: 15px;
    font-size: 14px;
}

.loading {
    text-align: center;
    padding: 40px;
    color: #666;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

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

    .card {
        padding: 24px;
    }

    .nav-content {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .user-email {
        display: none;
    }
}