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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --background-color: #ecf0f1;
    --error-color: #e74c3c;
    --success-color: #2ecc71;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --border-radius: 12px;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --paper-texture: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'%3E%3Cg fill-opacity='0.03'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z'/%3E%3C/g%3E%3C/svg%3E");
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background-color);
    background-image: var(--paper-texture);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: 80px;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    box-shadow: var(--shadow);
}

.header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.header p {
    opacity: 0.9;
    font-size: 1rem;
}

/* Main Content */
.main-content {
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* Sections */
.section {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.section-header h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

/* Dashboard */
.dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.dashboard-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    border-left: 4px solid var(--secondary-color);
}

.dashboard-card h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.consumption-display, .savings-display {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.consumption-value, .savings-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.consumption-unit, .savings-period {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Quick Actions */
.quick-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.action-btn {
    flex: 1;
    min-width: 150px;
    padding: 1rem;
    background: var(--secondary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.action-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* Tips Container */
.recent-tips {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.recent-tips h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.tips-container {
    display: grid;
    gap: 1rem;
}

.tip-card {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--success-color);
}

.tip-card h4 {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.tip-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn-primary, .btn-secondary {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: #2980b9;
}

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

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

/* Appliances List */
.appliances-list {
    display: grid;
    gap: 1rem;
    margin-bottom: 2rem;
}

.appliance-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.appliance-info h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.appliance-details {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.appliance-consumption {
    text-align: right;
}

.consumption-kwh {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--secondary-color);
}

.consumption-cost {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.appliance-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.btn-icon.edit {
    color: var(--secondary-color);
}

.btn-icon.delete {
    color: var(--error-color);
}

.btn-icon:hover {
    background: rgba(0, 0, 0, 0.1);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    animation: modalFadeIn 0.3s ease;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

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

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.1);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--primary-color);
}

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

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

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

/* Analysis Section */
.analysis-container {
    display: grid;
    gap: 2rem;
    grid-template-columns: 1fr;
}

.chart-container {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.chart-container h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.chart-container canvas {
    width: 100%;
    height: auto;
}

.peak-hours {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.peak-hours h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.peak-hour-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: #f8f9fa;
    border-radius: 8px;
}

.peak-hour-time {
    font-weight: 500;
    color: var(--primary-color);
}

.peak-hour-consumption {
    color: var(--secondary-color);
    font-weight: bold;
}

/* Tips Section */
.tips-categories {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.category-btn {
    padding: 0.5rem 1rem;
    background: white;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.category-btn.active,
.category-btn:hover {
    background: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
}

.tip-card-full {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border-left: 4px solid var(--success-color);
}

.tip-card-full h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.tip-card-full p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.tip-savings {
    background: #e8f5e8;
    padding: 0.5rem;
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--success-color);
    font-weight: 500;
}

/* FAQ Section */
.faq-section {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin: 2rem 0;
}

.faq-section h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    text-align: center;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid #eee;
    margin-bottom: 1rem;
}

.faq-question {
    width: 100%;
    padding: 1rem 0;
    background: none;
    border: none;
    text-align: left;
    font-size: 1rem;
    font-weight: 500;
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color 0.3s ease;
}

.faq-question:hover {
    color: var(--secondary-color);
}

.faq-icon {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 0 1rem 0;
    color: var(--text-secondary);
    line-height: 1.6;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-answer[hidden] {
    display: none;
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    display: flex;
    justify-content: around;
    padding: 0.5rem;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 100;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.5rem;
    text-decoration: none;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    border-radius: 8px;
    min-width: 60px;
}

.nav-item.active,
.nav-item:hover {
    color: var(--secondary-color);
    background: rgba(52, 152, 219, 0.1);
}

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.nav-item span {
    font-size: 0.75rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    background: white;
    margin-top: 2rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #ddd;
}

.empty-state h3 {
    margin-bottom: 0.5rem;
}

/* Responsive Design */
@media (min-width: 768px) {
    .main-content {
        padding: 2rem;
    }
    
    .dashboard {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .analysis-container {
        grid-template-columns: 2fr 1fr;
    }
    
    .bottom-nav {
        position: relative;
        box-shadow: none;
        background: transparent;
        justify-content: center;
        gap: 2rem;
        padding: 2rem 0;
    }
    
    .nav-item {
        flex-direction: row;
        gap: 0.5rem;
        padding: 1rem 2rem;
        background: white;
        box-shadow: var(--shadow);
        border-radius: var(--border-radius);
        min-width: auto;
    }
    
    .nav-item span {
        font-size: 1rem;
    }
    
    body {
        padding-bottom: 0;
    }
}

@media (min-width: 1024px) {
    .analysis-container {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
    }
    
    .monthly-trend {
        grid-column: 1 / -1;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-success { color: var(--success-color); }
.text-error { color: var(--error-color); }
.text-secondary { color: var(--text-secondary); }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }

.hidden { display: none; }
.visible { display: block; }

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

/* Error and Success Messages */
.message {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.message.info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}