/* CSS Variables for consistent theming */
:root {
    --color-primary: #7868E6;
    --color-secondary: #B8B5FF;
    --color-accent: #FFB4B4;
    --color-background: #EDEEF7;
    --color-light: #E4FBFF;
    --color-white: #FFFFFF;
    --color-dark: #2C2C2C;
    --color-gray: #666666;
    --color-light-gray: #F5F5F5;
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-error: #dc3545;
    
    /* Device Bar Heights - Will be set by config-device-bar.js */
    --statusbar-height: 24px; /* Default visible height */
    --actionbar-height: 48px; /* Default visible height */
    
    --font-family-primary: '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-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Device Bars */
.device-status-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--statusbar-height);
    background: var(--color-primary);
    z-index: 10000;
    display: block; /* Always visible */
}

.device-action-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--actionbar-height);
    background: var(--color-primary);
    z-index: 10000;
    display: block; /* Always visible */
}

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

/* Performance optimizations */
* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img, svg {
    max-width: 100%;
    height: auto;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-background);
    background-image: 
        radial-gradient(circle at 20px 20px, rgba(255, 255, 255, 0.2) 1px, transparent 1px),
        radial-gradient(circle at 80px 80px, rgba(255, 255, 255, 0.15) 1px, transparent 1px);
    background-size: 100px 100px, 160px 160px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-top: var(--statusbar-height);
    padding-bottom: var(--actionbar-height);
}

/* Container */
.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: var(--color-white);
    padding: var(--spacing-xl) 0;
    text-align: center;
    box-shadow: var(--shadow-md);
    position: relative;
}

.header__logo {
    margin-bottom: var(--spacing-lg);
    display: flex;
    justify-content: center;
    align-items: center;
}

.header__logo-img {
    max-height: 80px;
    max-width: 200px;
    width: auto;
    height: auto;
    object-fit: contain;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
    transition: var(--transition-normal);
}

.header__logo-img:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 6px 12px rgba(0, 0, 0, 0.4));
}

.header__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.header__subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    font-weight: 300;
}

/* Navigation */
.navigation {
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    z-index: 100;
}

.navigation--top {
    position: sticky;
    top: 0;
}

.navigation--bottom {
    position: fixed;
    bottom: var(--actionbar-height);
    left: 0;
    right: 0;
    display: none;
    border-top: 1px solid var(--color-light);
    background: var(--color-white);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.navigation__list {
    display: flex;
    list-style: none;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    justify-content: center;
    align-items: center;
}

.navigation__item {
    flex-shrink: 0;
}

.navigation__button {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--color-gray);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: var(--transition-normal);
    cursor: pointer;
    white-space: nowrap;
    min-width: 100px;
    justify-content: center;
    flex-direction: column;
}

.navigation__button:hover,
.navigation__button:focus {
    background: var(--color-light);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.navigation__button.active {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    position: relative;
}

.navigation__button.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--color-white);
    border-radius: 2px;
}

.navigation__icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.navigation__text {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Main Content */
.main {
    flex: 1;
    padding: var(--spacing-xl) 0;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.tab-content.active {
    display: block;
}

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

/* Calculator Section */
.calculator {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.calculator__header {
    margin-bottom: var(--spacing-xl);
}

.calculator__title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

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

.summary-card {
    background: var(--color-light);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    text-align: center;
    border: 2px solid transparent;
    transition: var(--transition-normal);
}

.summary-card:hover {
    border-color: var(--color-secondary);
    transform: translateY(-2px);
}

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

.summary-card__label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    opacity: 0.8;
}

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

.calculator__controls {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    justify-content: center;
}

/* Categories Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    max-width: 800px;
    margin: 0 auto;
}

/* Desktop optimizations */
@media (min-width: 1024px) {
    .categories-grid {
        max-width: 900px;
        gap: var(--spacing-md);
    }
    
    .category-card {
        min-height: 200px;
    }
    
    .category-card__items {
        min-height: 120px;
    }
}

.category-card {
    background: var(--color-white);
    border: 1px solid var(--color-light);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 160px;
}

.category-card:hover {
    border-color: var(--color-secondary);
    box-shadow: var(--shadow-md);
}

.category-card__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--color-light);
    flex-shrink: 0;
}

.category-card__title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-primary);
    line-height: 1.2;
    flex: 1;
    margin-right: var(--spacing-xs);
}

.category-card__total {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent);
    background: var(--color-light);
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    white-space: nowrap;
}

.category-card__items {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    min-height: 80px;
    overflow-y: auto;
    padding-right: var(--spacing-xs);
}

.category-card__items::-webkit-scrollbar {
    width: 4px;
}

.category-card__items::-webkit-scrollbar-track {
    background: var(--color-light);
    border-radius: 2px;
}

.category-card__items::-webkit-scrollbar-thumb {
    background: var(--color-secondary);
    border-radius: 2px;
}

.category-card__items::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

.category-card__empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--color-gray);
    padding: var(--spacing-sm);
    min-height: 60px;
}

.category-card__empty svg {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.category-card__empty p {
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.category-card__empty small {
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

.item-card {
    background: var(--color-light-gray);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
    border: 1px solid transparent;
    flex-shrink: 0;
}

.item-card:hover {
    background: var(--color-light);
    border-color: var(--color-secondary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.item-card__info {
    flex: 1;
}

.item-card__name {
    font-weight: 600;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

.item-card__details {
    font-size: var(--font-size-xs);
    color: var(--color-gray);
}

.item-card__price {
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    margin-right: var(--spacing-xs);
}

.item-card__actions {
    display: flex;
    gap: var(--spacing-xs);
}

.item-card__action {
    background: none;
    border: none;
    color: var(--color-gray);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
}

.item-card__action:hover {
    background: var(--color-light);
    color: var(--color-primary);
}

.item-card__action--delete:hover {
    color: var(--color-error);
}

.item-card__action svg {
    width: 14px;
    height: 14px;
}

/* Timeline Section */
.timeline {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
}

.timeline__header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.timeline__title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.timeline__subtitle {
    color: var(--color-gray);
    font-size: var(--font-size-lg);
}

.timeline__container {
    position: relative;
}

.timeline__period {
    margin-bottom: var(--spacing-xl);
    position: relative;
    padding-left: var(--spacing-xl);
}

.timeline__period::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--color-secondary);
    border-radius: var(--border-radius-sm);
}

.timeline__period-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-light);
    border-radius: var(--border-radius-md);
}

.timeline__period-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary);
}

.timeline__period-total {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-accent);
}

.timeline__items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-sm);
}

.timeline__empty {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-gray);
}

.timeline__empty svg {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
}

.timeline__empty h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.timeline__empty p {
    font-size: var(--font-size-base);
    opacity: 0.8;
}

/* Charts Section */
.charts {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
}

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

.charts__title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-primary);
}

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

.charts__container {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

#mainChart {
    max-width: 100%;
    height: auto;
    min-height: 400px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.charts__legend {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--color-light-gray);
    border-radius: var(--border-radius-sm);
}

.legend-item__color {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    flex-shrink: 0;
}

.legend-item__label {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.legend-item__value {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-primary);
    margin-left: auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-normal);
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
}

.btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

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

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

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

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

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

.btn__icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal.active {
    display: flex;
}

.modal__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal__content {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    z-index: 1001;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

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

.modal__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-primary);
}

.modal__close {
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    color: var(--color-gray);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
}

.modal__close:hover {
    background: var(--color-light);
    color: var(--color-primary);
}

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

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

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-dark);
    margin-bottom: var(--spacing-xs);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--color-light);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
    background: var(--color-white);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(120, 104, 230, 0.1);
}

.form-input:invalid,
.form-select:invalid,
.form-textarea:invalid {
    border-color: var(--color-error);
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
}

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

/* Loading Spinner */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 2000;
}

.loading.active {
    display: flex;
}

.loading__spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-light);
    border-top: 4px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading__text {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-lg);
    color: var(--color-primary);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 3000;
}

.toast {
    background: var(--color-white);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    min-width: 300px;
    border-left: 4px solid var(--color-primary);
    animation: toastSlideIn 0.3s ease;
}

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

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

.toast--error {
    border-left-color: var(--color-error);
}

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

.toast__message {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

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

.footer__text {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

/* Tablet and Mobile Navigation */
@media (max-width: 1200px) {
    .navigation--top {
        display: none;
    }
    
    .navigation--bottom {
        display: block;
    }
    
    .main {
        padding-bottom: calc(80px + var(--actionbar-height));
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .header__logo-img {
        max-height: 60px;
        max-width: 150px;
    }
    
    .header__title {
        font-size: var(--font-size-2xl);
    }
    
    .calculator,
    .timeline,
    .charts {
        padding: var(--spacing-md);
    }
    
    .calculator__controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .calculator__summary {
        grid-template-columns: 1fr;
    }
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xs);
        max-width: 100%;
    }
    
    .category-card {
        min-height: 140px;
        padding: var(--spacing-sm);
    }
    
    .category-card__title {
        font-size: var(--font-size-sm);
    }
    
    .category-card__total {
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs);
    }
    
    .charts__header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .charts__controls {
        justify-content: center;
    }
    
    
    .navigation__list {
        justify-content: space-around;
        padding: var(--spacing-sm) 0;
        gap: 0;
    }
    
    .navigation__button {
        flex-direction: column;
        gap: var(--spacing-xs);
        padding: var(--spacing-sm);
        min-width: 60px;
        flex: 1;
        max-width: 80px;
    }
    
    .navigation__text {
        font-size: var(--font-size-xs);
    }
    
    .navigation__icon {
        width: 24px;
        height: 24px;
        transition: var(--transition-normal);
    }
    
    .navigation__button:hover .navigation__icon {
        transform: scale(1.1);
    }
    
    .navigation__button.active .navigation__icon {
        transform: scale(1.1);
    }
    
    .modal__content {
        margin: var(--spacing-sm);
        max-height: calc(100vh - 2rem);
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .toast-container {
        left: var(--spacing-sm);
        right: var(--spacing-sm);
        bottom: calc(100px + var(--actionbar-height)); /* Above bottom navigation + action bar */
        top: auto;
    }
    
    .toast {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .header {
        padding: var(--spacing-md) 0;
    }
    
    .header__title {
        font-size: var(--font-size-xl);
    }
    
    .header__subtitle {
        font-size: var(--font-size-base);
    }
    
    .navigation__list {
        flex-wrap: wrap;
        gap: var(--spacing-xs);
    }
    
    .navigation__button {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
    
    .timeline__period {
        padding-left: var(--spacing-md);
    }
    
    .timeline__items {
        grid-template-columns: 1fr;
    }
    
    .charts__legend {
        grid-template-columns: 1fr;
    }
    
    #mainChart {
        min-height: 300px;
    }
    
    .summary-card {
        padding: var(--spacing-sm);
    }
    
    .summary-card__value {
        font-size: var(--font-size-lg);
    }
    
    .categories-grid {
        gap: var(--spacing-xs);
    }
    
    .category-card {
        padding: var(--spacing-xs);
        min-height: 100px;
    }
    
    .category-card__title {
        font-size: var(--font-size-xs);
    }
    
    .category-card__total {
        font-size: var(--font-size-xs);
        padding: 2px var(--spacing-xs);
    }
    
    .category-card__items {
        min-height: 50px;
    }
    
    .item-card {
        padding: var(--spacing-xs);
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .item-card__price {
        margin-right: 0;
        margin-top: var(--spacing-xs);
        align-self: flex-end;
    }
    
    .item-card__actions {
        align-self: flex-end;
        margin-top: var(--spacing-xs);
    }
}

/* Extra small screens */
@media (max-width: 360px) {
    .container {
        padding: 0 var(--spacing-xs);
    }
    
    .header__logo-img {
        max-height: 50px;
        max-width: 120px;
    }
    
    .header__title {
        font-size: var(--font-size-lg);
    }
    
    .header__subtitle {
        font-size: var(--font-size-sm);
    }
    
    .navigation__text {
        display: none;
    }
    
    .navigation__button {
        min-width: 50px;
        padding: var(--spacing-xs);
    }
    
    .navigation__icon {
        width: 20px;
        height: 20px;
    }
    
    .calculator__controls {
        gap: var(--spacing-sm);
    }
    
    .btn {
        padding: var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
    
    .btn__icon {
        width: 16px;
        height: 16px;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }
    
    .category-card {
        min-height: 80px;
    }
}

/* Print Styles */
@media print {
    .navigation,
    .calculator__controls,
    .charts__controls,
    .modal,
    .loading,
    .toast-container {
        display: none !important;
    }
    
    .header {
        background: none !important;
        color: var(--color-dark) !important;
    }
    
    .main {
        padding: 0 !important;
    }
    
    .tab-content {
        display: block !important;
    }
    
    .calculator,
    .timeline,
    .charts {
        box-shadow: none !important;
        border: 1px solid var(--color-gray);
        page-break-inside: avoid;
        margin-bottom: var(--spacing-lg);
    }
}

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

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #000000;
        --color-secondary: #333333;
        --color-background: #ffffff;
        --color-light: #f0f0f0;
    }
}