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

:root {
    /* Color Palette */
    --color-primary: #F8B195;
    --color-secondary: #F67280;
    --color-tertiary: #C06C84;
    --color-quaternary: #6C5B7B;
    --color-dark: #355C7D;
    
    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-card: #333333;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --border-color: #444444;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.4);
}

/* Base Styles */
body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    padding: var(--spacing-xl) 0;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.1'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
    opacity: 0.3;
}

.header .container {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.header__subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.theme-toggle__icon {
    font-size: var(--font-size-xl);
}

/* Main Content */
.main {
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - 200px);
}

/* Sections */
.section__title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    color: var(--color-dark);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

[data-theme="dark"] .section__title {
    color: var(--color-primary);
}

/* Configuration Section */
.config-section {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.config-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    align-items: end;
}

/* Form Styles */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.form-input,
.form-select {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(248, 177, 149, 0.1);
}

/* Add Item Section */
.add-item-section {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.add-item-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Buttons */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    justify-content: center;
    min-height: 44px;
}

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

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

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

.btn--secondary:hover {
    background: var(--color-dark);
    transform: translateY(-2px);
}

.btn--danger {
    background: #dc3545;
    color: white;
}

.btn--danger:hover {
    background: #c82333;
    transform: translateY(-2px);
}

/* Summary Section */
.summary-section {
    margin-bottom: var(--spacing-xl);
}

.weight-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.summary-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.summary-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.summary-card__title {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.summary-card__value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-dark);
}

[data-theme="dark"] .summary-card__value {
    color: var(--color-primary);
}

.weight-progress {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.progress-bar {
    width: 100%;
    height: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.progress-bar__fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-lg);
    transition: width 0.5s ease;
    width: 0%;
}

.progress-bar__fill.warning {
    background: linear-gradient(90deg, #ffc107, #fd7e14);
}

.progress-bar__fill.danger {
    background: linear-gradient(90deg, #dc3545, #c82333);
}

.progress-text {
    text-align: center;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Items Section */
.items-section {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.items-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.items-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.items-filters {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-size: var(--font-size-sm);
}

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

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

.item-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
}

.item-card:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow);
}

.item-card__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.item-card__name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.item-card__priority {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
}

.priority-essential {
    background: #dc3545;
    color: white;
}

.priority-important {
    background: #ffc107;
    color: #000;
}

.priority-optional {
    background: #28a745;
    color: white;
}

.item-card__details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.item-detail {
    text-align: center;
}

.item-detail__label {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.item-detail__value {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
}

.item-card__actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

.btn-small {
    padding: var(--spacing-sm);
    font-size: var(--font-size-sm);
    min-height: auto;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-secondary);
    font-style: italic;
}

/* Saved Lists Section */
.saved-lists-section {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.saved-lists {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.saved-list-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.saved-list-card__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.saved-list-card__name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.saved-list-card__date {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.saved-list-card__info {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.saved-list-card__actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

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

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-hover);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Alert System */
.alert-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1100;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    color: white;
    font-weight: 600;
    box-shadow: var(--shadow);
    animation: alertSlideIn 0.3s ease;
    max-width: 400px;
    position: relative;
}

.alert--success {
    background: #28a745;
}

.alert--error {
    background: #dc3545;
}

.alert--warning {
    background: #ffc107;
    color: #000;
}

.alert--info {
    background: #17a2b8;
}

@keyframes alertSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Footer */
.footer {
    background: var(--color-dark);
    color: white;
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-top: auto;
}

.footer p {
    margin: 0;
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .header .container {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .header__title {
        font-size: var(--font-size-2xl);
    }
    
    .config-form {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .weight-summary {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .items-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .items-actions {
        justify-content: center;
    }
    
    .saved-lists {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        margin: var(--spacing-md);
    }
    
    .alert-container {
        left: 10px;
        right: 10px;
    }
    
    .alert {
        max-width: none;
    }
}

@media (max-width: 480px) {
    .weight-summary {
        grid-template-columns: 1fr;
    }
    
    .item-card__details {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .items-filters {
        justify-content: center;
    }
    
    .filter-btn {
        flex: 1;
        min-width: 80px;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .theme-toggle,
    .items-actions,
    .items-filters,
    .btn,
    .config-section,
    .add-item-section,
    .saved-lists-section {
        display: none !important;
    }
    
    .main {
        padding: 0;
    }
    
    .items-section {
        box-shadow: none;
        border: 1px solid #000;
    }
    
    .summary-section {
        border: 1px solid #000;
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }
    
    .item-card {
        border: 1px solid #000;
        margin-bottom: var(--spacing-sm);
        break-inside: avoid;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for accessibility */
button:focus,
input:focus,
select:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    }
    
    [data-theme="dark"] {
        --border-color: #ffffff;
    }
}