/* css/style.css - Mobile-first responsive design */

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4CAF50;
    --primary-dark: #388E3C;
    --primary-light: #81C784;
    --secondary-color: #FF9800;
    --danger-color: #F44336;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --info-color: #2196F3;
    --bg-color: #F5F5F5;
    --card-bg: #FFFFFF;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #E0E0E0;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 8px rgba(0,0,0,0.15);
    --radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 1rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.btn-logout {
    background: rgba(255,255,255,0.2);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.btn-logout:hover {
    background: rgba(255,255,255,0.3);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* Cards */
.fast-status-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    text-align: center;
}

.timer-display h2,
.not-fasting h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

/* Timer */
.timer {
    font-size: 3rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    margin: 1.5rem 0;
    color: var(--primary-color);
    letter-spacing: 0.05em;
}

.timer.target-reached {
    color: var(--success-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.timer-info {
    margin: 1rem 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.timer-info p {
    margin: 0.25rem 0;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

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

.stat-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Quick Actions */
.quick-actions {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.quick-actions h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.action-buttons {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

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

.btn-danger:hover {
    background: #D32F2F;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    min-width: 200px;
}

.btn-block {
    width: 100%;
}

.btn-icon {
    font-size: 1.2rem;
}

/* Chart Section */
.chart-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.chart-section h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

#weightChart {
    height: 250px !important;
}

/* Recent Activity */
.recent-activity {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.recent-activity h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.fast-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 0.75rem;
    background: var(--bg-color);
    transition: var(--transition);
}

.fast-item:hover {
    background: #E8F5E9;
}

.fast-item.success {
    border-left: 4px solid var(--success-color);
}

.fast-item.partial {
    border-left: 4px solid var(--warning-color);
}

.fast-item.active {
    border-left: 4px solid var(--info-color);
}

.fast-status {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: 50%;
    flex-shrink: 0;
}

.fast-details {
    flex: 1;
}

.fast-date {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.fast-duration {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.no-data, .error, .loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--card-bg);
    margin: 10% auto;
    padding: 2rem;
    border-radius: var(--radius);
    max-width: 500px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    animation: modalSlideIn 0.3s ease;
}

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

.modal-content h2 {
    margin-bottom: 1.5rem;
}

.close {
    color: var(--text-secondary);
    float: right;
    font-size: 2rem;
    font-weight: bold;
    line-height: 1;
    cursor: pointer;
    transition: var(--transition);
}

.close:hover {
    color: var(--text-primary);
}

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

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

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

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--text-primary);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-hover);
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 1001;
    max-width: 300px;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

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

.toast-error {
    background: var(--danger-color);
}

.toast-warning {
    background: var(--warning-color);
}

.toast-info {
    background: var(--info-color);
}

/* Login Page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 1rem;
}

.login-box {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

.login-box h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.login-box h2 {
    text-align: center;
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-weight: normal;
}

.error-message {
    background: #FFEBEE;
    color: var(--danger-color);
    padding: 0.75rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.login-help {
    margin-top: 1.5rem;
    text-align: center;
    color: var(--text-secondary);
}

.login-help code {
    background: var(--bg-color);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
}

/* Responsive Design */
@media (min-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .action-buttons {
        grid-template-columns: repeat(3, 1fr);
    }
    
    header h1 {
        font-size: 1.75rem;
    }
    
    .timer {
        font-size: 4rem;
    }
    
    #weightChart {
        height: 300px !important;
    }
}

@media (max-width: 480px) {
    .timer {
        font-size: 2.5rem;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .modal-content {
        margin: 20% auto;
        padding: 1.5rem;
    }
    
    .toast {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
    }
}

/* PWA Specific */
@media (display-mode: standalone) {
    header {
        padding-top: env(safe-area-inset-top);
    }
    
    body {
        padding-bottom: env(safe-area-inset-bottom);
    }
}