/* Base Styles */
:root {
    --primary: #2196F3;
    --secondary: #9C27B0;
    --success: #4CAF50;
    --warning: #FFC107;
    --danger: #F44336;
    --gray-light: #f5f5f5;
    --gray: #e0e0e0;
    --gray-dark: #9e9e9e;
    --text-primary: #212121;
    --text-secondary: #757575;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 4px 20px rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Dark Theme */
.dark-theme {
    --primary: #2196F3;
    --secondary: #BB86FC;
    --success: #00E676;
    --warning: #FFD600;
    --danger: #FF5252;
    --gray-light: #333333;
    --gray: #424242;
    --gray-dark: #616161;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-heavy: 0 4px 20px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background-color: var(--gray-light);
    transition: var(--transition);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.dark-theme {
    background-color: #121212;
    color: white;
}

.fa-chevron-left{

    font-size: 1.2rem;
    margin-bottom: 16px;
}
.fa-chevron-right{
    font-size: 1.2rem;
    margin-bottom: 16px;
}
.fa-fire{
    font-size: 1.2rem;
    margin-bottom: 16px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.75rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

/* Layout */
header {
    background-color: var(--primary);
    color: white;
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.logo i {
    font-size: 1.5rem;
}

nav {
    display: flex;
    justify-content: space-between;
    overflow-x: auto;
    gap: var(--spacing-xs);
    padding-bottom: var(--spacing-xs);
}

.nav-btn {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-sm);
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-btn i {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
}

.nav-btn.active {
    color: white;
    background-color: rgba(255, 255, 255, 0.2);
}

main {
    flex: 1;
    padding: var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Screens */
.screen {
    display: none;
    animation-duration: 0.3s;
}

.screen.active {
    display: block;
}

/* Dashboard */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.date-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.date-selector button {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 1rem;
    padding: var(--spacing-xs);
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.dark-theme .card {
    background-color: var(--gray);
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

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

.card-value {
    font-size: 1.5rem;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: baseline;
    gap: var(--spacing-xs);
}

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

.consumed {
    border-top: 4px solid var(--primary);
}

.goal {
    border-top: 4px solid var(--success);
}

.remaining {
    border-top: 4px solid var(--warning);
}

.progress-container {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.dark-theme .progress-container {
    background-color: var(--gray);
}

.progress-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.progress-bar {
    height: 20px;
    background-color: var(--gray);
    border-radius: 10px;
    overflow: hidden;
}

.dark-theme .progress-bar {
    background-color: var(--gray-dark);
}

#progress-fill {
    height: 100%;
    background-color: var(--primary);
    width: 0;
    transition: width 1s ease-in-out;
}

.chart-container {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow);
    height: 300px;
}

.dark-theme .chart-container {
    background-color: var(--gray);
}

.today-meals {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
    margin-bottom: var(--spacing-lg);
}

.dark-theme .today-meals {
    background-color: var(--gray);
}

.meals-list {
    margin-top: var(--spacing-md);
}

.meal-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--gray);
    animation: fadeIn 0.3s ease;
}

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

.meal-info {
    display: flex;
    flex-direction: column;
}

.meal-name {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

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

.meal-calories {
    font-weight: bold;
    color: var(--primary);
}

.meal-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.meal-actions button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.meal-actions button:hover {
    color: var(--primary);
}

.meal-actions .delete-btn:hover {
    color: var(--danger);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* Add Food Form */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

input, select, textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--gray);
    border-radius: var(--border-radius);
    background-color: white;
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.dark-theme input, 
.dark-theme select, 
.dark-theme textarea {
    background-color: var(--gray);
    border-color: var(--gray-dark);
    color: white;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(33, 150, 243, 0.2);
}

.input-with-unit {
    display: flex;
    align-items: center;
}

.input-with-unit input {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
    border-right: none;
}

.input-with-unit select,
.input-with-unit .unit-label {
    width: auto;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    background-color: var(--gray-light);
    color: var(--text-secondary);
    padding: var(--spacing-md);
    border: 1px solid var(--gray);
    font-size: 0.9rem;
}

.dark-theme .input-with-unit select,
.dark-theme .input-with-unit .unit-label {
    background-color: var(--gray-dark);
    border-color: var(--gray-dark);
    color: white;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* History */
.history-filters {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.dark-theme .history-filters {
    background-color: var(--gray);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.date-range {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.date-input {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.date-input input {
    width: 150px;
}

.history-summary {
    display: flex;
    justify-content: space-between;
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.dark-theme .history-summary {
    background-color: var(--gray);
}

.summary-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.summary-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.summary-value {
    font-size: 1.2rem;
    font-weight: bold;
}

.history-chart-container {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow);
    height: 300px;
}

.dark-theme .history-chart-container {
    background-color: var(--gray);
}

.history-days {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.history-day {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.dark-theme .history-day {
    background-color: var(--gray);
}

.day-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background-color: var(--gray-light);
    cursor: pointer;
}

.dark-theme .day-header {
    background-color: var(--gray-dark);
}

.day-date {
    font-weight: 600;
}

.day-total {
    font-weight: bold;
    color: var(--primary);
}

.day-meals {
    padding: var(--spacing-md);
    display: none;
}

.day-meals.expanded {
    display: block;
    animation: slideDown 0.3s ease;
}

/* Settings */
.settings-group {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.dark-theme .settings-group {
    background-color: var(--gray);
}

.setting-item {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--gray);
}

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

.theme-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.theme-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Switch Toggle */
.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--gray);
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--primary);
}

input:focus + .slider {
    box-shadow: 0 0 1px var(--primary);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.radio {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.radio input {
    width: auto;
}

.danger-zone {
    background-color: rgba(244, 67, 54, 0.1);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.dark-theme .danger-zone {
    background-color: rgba(244, 67, 54, 0.2);
}

.app-info {
    text-align: center;
    padding: var(--spacing-lg) 0;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background-color: #1976D2;
}

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

.btn-secondary:hover {
    background-color: var(--gray-dark);
}

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

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

.btn-small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.9rem;
}

.floating-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--primary);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-heavy);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    z-index: 10;
}

.floating-btn:hover {
    transform: scale(1.1);
    background-color: #1976D2;
}

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

.modal.active {
    display: flex;
}

.modal-content {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-heavy);
}

.dark-theme .modal-content {
    background-color: var(--gray);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* Toast */
.toast {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background-color: white;
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    display: flex;
    flex-direction: column;
    min-width: 300px;
    z-index: 1000;
    transition: bottom 0.3s ease;
}

.dark-theme .toast {
    background-color: var(--gray);
}

.toast.show {
    bottom: 24px;
}

.toast-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.toast-content i {
    font-size: 1.5rem;
}

.toast-content i.fa-check-circle {
    color: var(--success);
}

.toast-content i.fa-exclamation-circle {
    color: var(--danger);
}

.toast-progress {
    height: 4px;
    background-color: var(--primary);
    margin-top: var(--spacing-sm);
    width: 100%;
    animation: progress 3s linear forwards;
}

@keyframes progress {
    0% { width: 100%; }
    100% { width: 0%; }
}

/* Footer */
footer {
    background-color: var(--primary);
    color: white;
    text-align: center;
    padding: var(--spacing-md);
    margin-top: auto;
}

footer a {
    color: white;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideDown {
    from { max-height: 0; opacity: 0; }
    to { max-height: 1000px; opacity: 1; }
}

@keyframes slideUp {
    from { max-height: 1000px; opacity: 1; }
    to { max-height: 0; opacity: 0; }
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .history-summary {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .date-range {
        flex-direction: column;
    }
    
    .filter-group {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .filter-group select,
    .filter-group input {
        width: 100%;
    }
}

@media (min-width: 768px) {
    .nav-btn {
        flex-direction: row;
        gap: var(--spacing-sm);
        justify-content: center;
    }
    
    .nav-btn i {
        margin-bottom: 0;
    }
    
    .logo {
        margin-bottom: 0;
    }
    
    header {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    nav {
        width: auto;
    }
}