/* =============================================
   Diet Planner - Modern Responsive Styles
   ============================================= */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* CSS Variables */
:root {
    /* Colors - Warm, healthy palette */
    --color-primary: #2d6a4f;
    --color-primary-light: #40916c;
    --color-primary-dark: #1b4332;
    --color-secondary: #95d5b2;
    --color-accent: #f77f00;
    --color-accent-light: #fcbf49;
    
    /* Neutrals */
    --color-bg: #fafbf9;
    --color-bg-card: #ffffff;
    --color-bg-dark: #1a1a2e;
    --color-text: #2d3436;
    --color-text-light: #636e72;
    --color-text-muted: #b2bec3;
    --color-border: #e8ebe7;
    
    /* Status colors */
    --color-success: #00b894;
    --color-warning: #fdcb6e;
    --color-error: #e17055;
    --color-info: #74b9ff;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Typography */
    --font-main: 'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Borders */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 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);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-main);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Layout */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    padding: var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Header */
.app-header {
    background: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-lg);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255,255,255,0.95);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    color: var(--color-primary);
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    text-decoration: none;
    color: var(--color-text-light);
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
    color: var(--color-primary);
    background: rgba(45, 106, 79, 0.1);
}

.nav-link.logout {
    color: var(--color-error);
}

.nav-link.logout:hover {
    background: rgba(225, 112, 85, 0.1);
}

/* User badge */
.user-badge {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-sm) var(--space-xs) var(--space-xs);
    background: var(--color-bg);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-secondary), var(--color-primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.85rem;
}

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: var(--space-sm);
    cursor: pointer;
    color: var(--color-text);
}

/* Cards */
.card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.card-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.card-body {
    padding: var(--space-lg);
}

.card-footer {
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

/* Today's Diet Card - Special styling */
.today-card {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    color: white;
    border: none;
}

.today-card .card-header {
    border-bottom-color: rgba(255,255,255,0.2);
}

.today-card .card-title {
    color: white;
}

.today-date {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-top: var(--space-xs);
}

/* Meal sections */
.meal-section {
    padding: var(--space-md) 0;
    border-bottom: 1px solid rgba(255,255,255,0.15);
}

.meal-section:last-child {
    border-bottom: none;
}

.meal-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: var(--space-sm);
    opacity: 0.9;
}

.meal-icon {
    width: 28px;
    height: 28px;
    background: rgba(255,255,255,0.2);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.meal-content {
    font-size: 0.95rem;
    line-height: 1.7;
    padding-left: calc(28px + var(--space-sm));
}

/* Forms */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: var(--space-md);
    font-family: var(--font-main);
    font-size: 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-card);
    color: var(--color-text);
    transition: var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(45, 106, 79, 0.15);
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* File upload */
.file-upload {
    position: relative;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    transition: var(--transition-fast);
    cursor: pointer;
}

.file-upload:hover, .file-upload.dragover {
    border-color: var(--color-primary);
    background: rgba(45, 106, 79, 0.05);
}

.file-upload input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.file-upload-icon {
    font-size: 3rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.file-upload-text {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.file-upload-text strong {
    color: var(--color-primary);
}

.file-name {
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--color-primary);
    display: none;
}

.file-name.visible {
    display: inline-block;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    font-family: var(--font-main);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

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

.btn-danger:hover:not(:disabled) {
    background: #c0392b;
}

.btn-sm {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
}

/* Alerts */
.alert {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
}

.alert-success {
    background: rgba(0, 184, 148, 0.1);
    color: #00896f;
    border: 1px solid rgba(0, 184, 148, 0.3);
}

.alert-error {
    background: rgba(225, 112, 85, 0.1);
    color: #c0392b;
    border: 1px solid rgba(225, 112, 85, 0.3);
}

.alert-warning {
    background: rgba(253, 203, 110, 0.2);
    color: #b7791f;
    border: 1px solid rgba(253, 203, 110, 0.5);
}

.alert-info {
    background: rgba(116, 185, 255, 0.1);
    color: #2980b9;
    border: 1px solid rgba(116, 185, 255, 0.3);
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

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

.table th, .table td {
    padding: var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.table th {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--color-bg);
}

.table tbody tr:hover {
    background: var(--color-bg);
}

/* Status badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success {
    background: rgba(0, 184, 148, 0.15);
    color: #00896f;
}

.badge-warning {
    background: rgba(253, 203, 110, 0.3);
    color: #b7791f;
}

.badge-danger {
    background: rgba(225, 112, 85, 0.15);
    color: #c0392b;
}

.badge-info {
    background: rgba(116, 185, 255, 0.15);
    color: #2980b9;
}

/* Week navigation */
.week-nav-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.week-nav-controls .btn {
    min-width: 120px;
    text-align: center;
}

.week-nav-controls .btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.week-nav-spacer {
    flex: 1;
}

.week-nav {
    display: flex;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
    overflow-x: auto;
    padding-bottom: var(--space-sm);
    -webkit-overflow-scrolling: touch;
}

.week-day-btn {
    flex: 1;
    min-width: 60px;
    padding: var(--space-md) var(--space-sm);
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.week-day-btn:hover {
    border-color: var(--color-primary-light);
}

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

.week-day-btn.today {
    border-color: var(--color-accent);
}

.week-day-btn.today.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.week-day-name {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-xs);
}

.week-day-date {
    font-size: 1.1rem;
    font-weight: 700;
}

/* Program list */
.program-list {
    display: grid;
    gap: var(--space-md);
}

.program-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.program-item:hover {
    background: rgba(45, 106, 79, 0.05);
}

.program-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.program-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-secondary), var(--color-primary-light));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.program-details h4 {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.program-details span {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.program-actions {
    display: flex;
    gap: var(--space-sm);
}

/* Login page */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    background: linear-gradient(135deg, var(--color-bg) 0%, rgba(149, 213, 178, 0.2) 100%);
}

.auth-card {
    width: 100%;
    max-width: 420px;
}

.auth-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.auth-logo {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    margin: 0 auto var(--space-md);
}

.auth-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.auth-subtitle {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--color-text-light);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: var(--space-lg);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-error { color: var(--color-error); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

.flex { display: flex; }
.flex-between { justify-content: space-between; }
.flex-center { align-items: center; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }

.hidden { display: none !important; }

/* Responsive */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .main-content {
        padding: var(--space-md);
    }
    
    .app-header {
        padding: var(--space-sm) var(--space-md);
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--color-bg-card);
        flex-direction: column;
        padding: var(--space-md);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-normal);
    }
    
    .nav-menu.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        justify-content: center;
        padding: var(--space-md);
    }
    
    .user-badge {
        margin-bottom: var(--space-md);
    }
    
    .card-header, .card-body, .card-footer {
        padding: var(--space-md);
    }
    
    .week-day-btn {
        min-width: 50px;
        padding: var(--space-sm);
    }
    
    .week-day-name {
        font-size: 0.65rem;
    }
    
    .week-day-date {
        font-size: 0.95rem;
    }
    
    .program-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }
    
    .program-actions {
        width: 100%;
    }
    
    .program-actions .btn {
        flex: 1;
    }
    
    .table th, .table td {
        padding: var(--space-sm);
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .header-inner {
        flex-wrap: wrap;
    }
    
    .logo span {
        display: none;
    }
    
    .meal-content {
        padding-left: 0;
        margin-top: var(--space-sm);
    }
}

/* Print styles */
@media print {
    .app-header, .nav-menu, .btn, .file-upload {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .today-card {
        background: none;
        color: black;
    }
}

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

.animate-fade-in {
    animation: fadeIn 0.3s ease forwards;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* Loading spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255,255,255,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

/* =============================================
   Meal Tracking Styles
============================================= */

.meal-section {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
    border-bottom: none;
}

.meal-section .meal-title {
    color: var(--color-text);
    opacity: 1;
}

.meal-section .meal-content {
    color: var(--color-text);
}

.meal-section .meal-icon {
    background: rgba(45, 106, 79, 0.1);
}

.meal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.meal-status-badge {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
}

.meal-status-badge.status-pending {
    background: #f0f0f0;
}

.meal-status-badge.status-completed {
    background: #d4edda;
}

.meal-status-badge.status-modified {
    background: #fff3cd;
}

.meal-status-badge.status-skipped {
    background: #f8d7da;
}

.meal-tracking {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px dashed var(--color-border);
}

.tracking-label {
    font-size: 0.85rem;
    color: #666;
    margin-bottom: var(--space-sm);
}

.tracking-options {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.tracking-option {
    flex: 1;
    min-width: 90px;
}

.tracking-option input[type="radio"] {
    display: none;
}

.tracking-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-sm) var(--space-xs);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    background: white;
}

.tracking-btn:hover {
    border-color: var(--color-primary-light);
}

.tracking-option input[type="radio"]:checked + .tracking-btn {
    border-color: var(--color-primary);
    background: rgba(45, 106, 79, 0.05);
}

.tracking-btn.completed:hover,
.tracking-option input[type="radio"]:checked + .tracking-btn.completed {
    border-color: #28a745;
    background: rgba(40, 167, 69, 0.15);
}

.tracking-btn.modified:hover,
.tracking-option input[type="radio"]:checked + .tracking-btn.modified {
    border-color: #e67e22;
    background: rgba(230, 126, 34, 0.15);
}

.tracking-btn.skipped:hover,
.tracking-option input[type="radio"]:checked + .tracking-btn.skipped {
    border-color: #dc3545;
    background: rgba(220, 53, 69, 0.15);
}

.tracking-icon {
    font-size: 1.2rem;
    margin-bottom: 2px;
}

.tracking-text {
    font-size: 0.75rem;
    text-align: center;
    color: #333;
    font-weight: 500;
}

.tracking-notes {
    margin-top: var(--space-sm);
    display: block;
}

.tracking-notes textarea {
    font-size: 0.9rem;
    resize: vertical;
    min-height: 60px;
    width: 100%;
}

.tracking-notes.hidden {
    display: none !important;
}

/* Saving indicator */
.meal-section.saving {
    opacity: 0.7;
    pointer-events: none;
}

.meal-section.saving::after {
    content: "Αποθήκευση...";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0,0,0,0.7);
    color: white;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
}

/* Mobile adjustments */
@media (max-width: 480px) {
    .tracking-options {
        gap: var(--space-xs);
    }
    
    .tracking-btn {
        padding: var(--space-xs);
    }
    
    .tracking-icon {
        font-size: 1rem;
    }
    
    .tracking-text {
        font-size: 0.65rem;
    }
}