/* iPhone-First Apple Design - 100% Optimized for iOS */
/* Designed specifically for iPhone with perfect touch targets and iOS Safari optimizations */

:root {
    /* Apple's Exact iOS Colors */
    --ios-blue: #0A84FF;
    --ios-blue-hover: #409CFF;
    --ios-green: #30D158;
    --ios-red: #FF453A;
    --ios-orange: #FF9F0A;
    --ios-yellow: #FFD60A;
    --ios-purple: #BF5AF2;
    --ios-pink: #FF2D55;
    
    /* iOS Background Colors */
    --ios-bg-primary: #000000;
    --ios-bg-secondary: rgba(28, 28, 30, 0.85);
    --ios-bg-tertiary: rgba(44, 44, 46, 0.7);
    --ios-bg-elevated: rgba(44, 44, 46, 0.85);
    --ios-bg-hover: rgba(58, 58, 60, 0.85);
    
    /* iOS Text Colors */
    --ios-text-primary: rgba(255, 255, 255, 0.95);
    --ios-text-secondary: rgba(255, 255, 255, 0.6);
    --ios-text-tertiary: rgba(255, 255, 255, 0.4);
    
    /* iOS Separators */
    --ios-separator: rgba(255, 255, 255, 0.12);
    --ios-separator-opaque: rgba(255, 255, 255, 0.2);
    
    /* iOS Touch Target (Apple HIG minimum) */
    --ios-touch: 44px;
    
    /* iOS Spacing (8pt grid) */
    --ios-spacing-xs: 4px;
    --ios-spacing-sm: 8px;
    --ios-spacing-md: 16px;
    --ios-spacing-lg: 20px;
    --ios-spacing-xl: 24px;
    --ios-spacing-2xl: 32px;
    --ios-spacing-3xl: 40px;
    
    /* iOS Blur */
    --ios-blur-light: blur(20px) saturate(180%);
    --ios-blur-medium: blur(40px) saturate(180%);
    --ios-blur-heavy: blur(80px) saturate(180%);
    
    /* iOS Shadows */
    --ios-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
    --ios-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
    --ios-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4), 0 2px 6px rgba(0, 0, 0, 0.3);
    --ios-shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5), 0 4px 8px rgba(0, 0, 0, 0.3);
    --ios-shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.6), 0 6px 12px rgba(0, 0, 0, 0.4);
}

/* Reset & Base - iPhone Optimized */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', sans-serif;
    font-size: 17px;
    line-height: 1.47059;
    letter-spacing: -0.022em;
    font-weight: 400;
    background: var(--ios-bg-primary);
    color: var(--ios-text-primary);
    min-height: 100vh;
    min-height: -webkit-fill-available;
    overflow-x: hidden;
    overscroll-behavior: none;
    -webkit-overflow-scrolling: touch;
    position: relative;
}

/* Safe Area Support for iPhone X+ */
body.standalone {
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
}

/* Text Selection */
input, textarea, [contenteditable] {
    -webkit-user-select: text;
    user-select: text;
}

/* Navigation - iPhone Optimized */
.navbar {
    background: var(--ios-bg-secondary);
    backdrop-filter: var(--ios-blur-medium);
    -webkit-backdrop-filter: var(--ios-blur-medium);
    border-bottom: 0.5px solid var(--ios-separator);
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
    padding-top: env(safe-area-inset-top);
    padding-bottom: var(--ios-spacing-sm);
}

.nav-container {
    position: relative;
    z-index: 1001;
    width: 100%;
    padding: 0 var(--ios-spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: var(--ios-touch);
}

.nav-logo {
    font-size: 18px;
    font-weight: 600;
    color: var(--ios-text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--ios-spacing-sm);
    white-space: nowrap;
    letter-spacing: 0.38px;
    line-height: 1.2;
}

.nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    width: var(--ios-touch);
    height: var(--ios-touch);
    min-width: var(--ios-touch);
    min-height: var(--ios-touch);
    padding: 0;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.2s;
    -webkit-tap-highlight-color: transparent;
    position: relative;
    z-index: 10001;
}

.nav-toggle:active {
    background: var(--ios-bg-hover);
}

.nav-toggle-icon {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 20px;
    height: 16px;
    position: relative;
}

.nav-toggle-line {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--ios-text-primary);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    transform-origin: center;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.nav-menu {
    display: flex;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    max-width: 85vw;
    background: var(--ios-bg-secondary);
    backdrop-filter: var(--ios-blur-heavy);
    -webkit-backdrop-filter: var(--ios-blur-heavy);
    list-style: none;
    margin: 0;
    padding: calc(var(--ios-touch) + var(--ios-spacing-md) + env(safe-area-inset-top)) var(--ios-spacing-md) calc(var(--ios-spacing-md) + env(safe-area-inset-bottom));
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    z-index: 10001;
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.5);
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
    visibility: visible;
}

.nav-menu.active {
    transform: translateX(0);
}

body.menu-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100%;
    touch-action: none;
}

body.menu-open::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9998;
}

.nav-link {
    color: var(--ios-text-secondary);
    text-decoration: none;
    padding: 0 var(--ios-spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--ios-spacing-md);
    font-size: 17px;
    font-weight: 400;
    min-height: var(--ios-touch);
    transition: background-color 0.2s;
    -webkit-tap-highlight-color: transparent;
    width: 100%;
}

.nav-link:active {
    background: var(--ios-bg-hover);
    color: var(--ios-text-primary);
}

.nav-link.active {
    color: var(--ios-blue);
    background: rgba(10, 132, 255, 0.15);
}

/* Main Content - iPhone Optimized */
.main-content {
    width: 100%;
    padding: var(--ios-spacing-lg) var(--ios-spacing-md);
    padding-bottom: calc(var(--ios-spacing-lg) + env(safe-area-inset-bottom));
    max-width: 100%;
    margin: 0;
    position: relative;
    z-index: 1;
}

.page {
    display: none;
    width: 100%;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

.page h2 {
    margin-bottom: var(--ios-spacing-lg);
    font-size: 28px;
    font-weight: 700;
    color: var(--ios-text-primary);
    display: flex;
    align-items: center;
    gap: var(--ios-spacing-md);
    line-height: 1.21429;
    letter-spacing: 0.36px;
}

.page > p {
    color: var(--ios-text-secondary);
    font-size: 17px;
    line-height: 1.47059;
    margin-bottom: var(--ios-spacing-xl);
}

/* Dashboard - iPhone Optimized */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--ios-spacing-md);
    margin-top: var(--ios-spacing-lg);
}

.dashboard-card {
    background: var(--ios-bg-tertiary);
    backdrop-filter: var(--ios-blur-medium);
    -webkit-backdrop-filter: var(--ios-blur-medium);
    border: 0.5px solid var(--ios-separator);
    border-radius: 16px;
    padding: var(--ios-spacing-xl);
    text-align: center;
    transition: transform 0.2s;
    box-shadow: var(--ios-shadow);
    min-height: 140px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
}

.dashboard-card:active {
    transform: scale(0.98);
    background: var(--ios-bg-elevated);
}

.dashboard-card h3 {
    color: var(--ios-text-secondary);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: var(--ios-spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    line-height: 1.38462;
}

.dashboard-card .count {
    font-size: 36px;
    font-weight: 700;
    color: var(--ios-blue);
    line-height: 1.1;
    letter-spacing: 0.5px;
}

.dashboard-icon {
    font-size: 36px;
    color: var(--ios-blue);
    margin-bottom: var(--ios-spacing-md);
    display: block;
}

/* Cards - iPhone Optimized */
.card {
    background: var(--ios-bg-tertiary);
    backdrop-filter: var(--ios-blur-medium);
    -webkit-backdrop-filter: var(--ios-blur-medium);
    border: 0.5px solid var(--ios-separator);
    border-radius: 16px;
    padding: var(--ios-spacing-lg);
    margin-bottom: var(--ios-spacing-md);
    box-shadow: var(--ios-shadow);
    -webkit-tap-highlight-color: transparent;
}

.card:active {
    transform: scale(0.98);
    background: var(--ios-bg-elevated);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--ios-spacing-md);
    padding-bottom: var(--ios-spacing-md);
    border-bottom: 0.5px solid var(--ios-separator);
    flex-wrap: wrap;
    gap: var(--ios-spacing-sm);
}

.card-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--ios-text-primary);
    line-height: 1.2;
    letter-spacing: 0.38px;
}

/* Lists - iPhone Optimized */
.list-container {
    margin-top: var(--ios-spacing-lg);
}

.list-item {
    background: var(--ios-bg-tertiary);
    backdrop-filter: var(--ios-blur-medium);
    -webkit-backdrop-filter: var(--ios-blur-medium);
    border: 0.5px solid var(--ios-separator);
    border-radius: 14px;
    padding: var(--ios-spacing-md);
    margin-bottom: var(--ios-spacing-sm);
    display: flex;
    flex-direction: column;
    gap: var(--ios-spacing-md);
    box-shadow: var(--ios-shadow-sm);
    -webkit-tap-highlight-color: transparent;
    min-height: var(--ios-touch);
}

.list-item:active {
    background: var(--ios-bg-elevated);
    transform: scale(0.98);
}

.list-item-content {
    flex: 1;
    width: 100%;
}

.list-item-content p {
    font-size: 17px;
    color: var(--ios-text-primary);
    margin-bottom: var(--ios-spacing-xs);
    line-height: 1.47059;
}

.list-item-actions {
    display: flex;
    gap: var(--ios-spacing-sm);
    flex-wrap: wrap;
    width: 100%;
    justify-content: flex-end;
}

/* Buttons - iPhone Optimized */
.btn {
    padding: var(--ios-spacing-md) var(--ios-spacing-lg);
    border: none;
    border-radius: 10px;
    font-size: 17px;
    font-weight: 600;
    line-height: 1.47059;
    letter-spacing: -0.022em;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--ios-spacing-sm);
    min-height: var(--ios-touch);
    width: 100%;
    -webkit-tap-highlight-color: transparent;
    -webkit-appearance: none;
    appearance: none;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--ios-blue);
    color: white;
    box-shadow: var(--ios-shadow-sm);
}

.btn-primary:active {
    background: var(--ios-blue-hover);
}

.btn-secondary {
    background: var(--ios-bg-tertiary);
    backdrop-filter: var(--ios-blur-light);
    -webkit-backdrop-filter: var(--ios-blur-light);
    color: var(--ios-blue);
    border: 0.5px solid var(--ios-separator);
}

.btn-secondary:active {
    background: var(--ios-bg-hover);
}

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

.btn-danger:active {
    background: #E6342A;
}

.btn-small {
    padding: var(--ios-spacing-sm) var(--ios-spacing-md);
    font-size: 15px;
    min-height: 36px;
    width: auto;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Forms - iPhone Optimized */
.form-group {
    margin-bottom: var(--ios-spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--ios-spacing-sm);
    color: var(--ios-text-secondary);
    font-weight: 400;
    font-size: 15px;
    line-height: 1.33337;
    letter-spacing: -0.016em;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--ios-spacing-md) var(--ios-spacing-lg);
    background: var(--ios-bg-tertiary);
    backdrop-filter: var(--ios-blur-light);
    -webkit-backdrop-filter: var(--ios-blur-light);
    border: 0.5px solid var(--ios-separator);
    border-radius: 10px;
    color: var(--ios-text-primary);
    font-size: 17px;
    line-height: 1.47059;
    transition: all 0.2s;
    font-family: inherit;
    min-height: var(--ios-touch);
    -webkit-appearance: none;
    appearance: none;
    -webkit-tap-highlight-color: transparent;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--ios-blue);
    background: var(--ios-bg-elevated);
    box-shadow: 0 0 0 4px rgba(10, 132, 255, 0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--ios-text-tertiary);
}

/* Search Input - iPhone Optimized */
.search-input {
    padding: var(--ios-spacing-md) var(--ios-spacing-lg);
    background: var(--ios-bg-tertiary);
    backdrop-filter: var(--ios-blur-light);
    -webkit-backdrop-filter: var(--ios-blur-light);
    border: 0.5px solid var(--ios-separator);
    border-radius: 10px;
    color: var(--ios-text-primary);
    font-size: 17px;
    line-height: 1.47059;
    width: 100%;
    transition: all 0.2s;
    font-family: inherit;
    min-height: var(--ios-touch);
    -webkit-appearance: none;
    appearance: none;
    -webkit-tap-highlight-color: transparent;
}

.search-input:focus {
    outline: none;
    border-color: var(--ios-blue);
    background: var(--ios-bg-elevated);
    box-shadow: 0 0 0 4px rgba(10, 132, 255, 0.15);
}

.search-input::placeholder {
    color: var(--ios-text-tertiary);
}

.page-header {
    display: flex;
    flex-direction: column;
    gap: var(--ios-spacing-md);
    margin-bottom: var(--ios-spacing-lg);
}

/* Sensors - iPhone Optimized */
.sensors-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--ios-spacing-md);
    margin-bottom: var(--ios-spacing-xl);
}

.sensor-card {
    background: var(--ios-bg-tertiary);
    backdrop-filter: var(--ios-blur-medium);
    -webkit-backdrop-filter: var(--ios-blur-medium);
    border: 0.5px solid var(--ios-separator);
    border-radius: 16px;
    padding: var(--ios-spacing-xl);
    box-shadow: var(--ios-shadow);
    -webkit-tap-highlight-color: transparent;
}

.sensor-card:active {
    transform: scale(0.98);
    background: var(--ios-bg-elevated);
}

.sensor-card h3 {
    color: var(--ios-blue);
    margin-bottom: var(--ios-spacing-lg);
    font-size: 20px;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: 0.38px;
}

.sensor-value {
    font-size: 36px;
    font-weight: 700;
    margin: var(--ios-spacing-sm) 0;
    color: var(--ios-text-primary);
    line-height: 1.1;
    letter-spacing: 0.5px;
}

.sensor-label {
    color: var(--ios-text-secondary);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    line-height: 1.38462;
}

/* Modal - iPhone Optimized */
.modal {
    display: none;
    position: fixed;
    z-index: 20000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: var(--ios-blur-light);
    -webkit-backdrop-filter: var(--ios-blur-light);
    overflow: auto;
    padding: var(--ios-spacing-md);
    -webkit-overflow-scrolling: touch;
}

.modal-content {
    background: var(--ios-bg-elevated);
    backdrop-filter: var(--ios-blur-heavy);
    -webkit-backdrop-filter: var(--ios-blur-heavy);
    margin: var(--ios-spacing-lg) auto;
    padding: var(--ios-spacing-xl);
    border: 0.5px solid var(--ios-separator);
    border-radius: 20px;
    width: 100%;
    max-width: 100%;
    position: relative;
    box-shadow: var(--ios-shadow-xl);
    max-height: calc(100vh - var(--ios-spacing-2xl));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.modal-content h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: var(--ios-spacing-lg);
    color: var(--ios-text-primary);
    line-height: 1.21429;
    letter-spacing: 0.36px;
}

.modal-close {
    position: absolute;
    right: var(--ios-spacing-lg);
    top: var(--ios-spacing-lg);
    font-size: 24px;
    color: var(--ios-text-secondary);
    cursor: pointer;
    line-height: 1;
    width: var(--ios-touch);
    height: var(--ios-touch);
    min-width: var(--ios-touch);
    min-height: var(--ios-touch);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: all 0.2s;
    -webkit-tap-highlight-color: transparent;
}

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

/* Shopping List - iPhone Optimized */
.shopping-quick-add {
    display: flex;
    flex-direction: column;
    gap: var(--ios-spacing-md);
    margin-bottom: var(--ios-spacing-lg);
}

.shopping-quick-add .search-input {
    width: 100%;
}

.shopping-controls {
    display: flex;
    flex-direction: column;
    gap: var(--ios-spacing-md);
    margin-bottom: var(--ios-spacing-lg);
    padding: var(--ios-spacing-lg);
    background: var(--ios-bg-tertiary);
    backdrop-filter: var(--ios-blur-medium);
    -webkit-backdrop-filter: var(--ios-blur-medium);
    border-radius: 14px;
    border: 0.5px solid var(--ios-separator);
    box-shadow: var(--ios-shadow-sm);
}

.shopping-filters {
    display: flex;
    flex-direction: column;
    gap: var(--ios-spacing-md);
    width: 100%;
}

.shopping-filters .search-input,
.shopping-filters select {
    width: 100%;
    max-width: 100%;
}

.shopping-stats {
    display: flex;
    justify-content: space-around;
    width: 100%;
    gap: var(--ios-spacing-lg);
    flex-wrap: wrap;
}

.stats-item {
    display: flex;
    flex-direction: column;
    gap: var(--ios-spacing-xs);
    align-items: center;
    flex: 1;
    min-width: 80px;
}

.stats-label {
    color: var(--ios-text-secondary);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    line-height: 1.38462;
}

.stats-value {
    color: var(--ios-blue);
    font-weight: 700;
    font-size: 24px;
    line-height: 1.2;
    letter-spacing: 0.36px;
}

.shopping-list-container {
    margin-top: var(--ios-spacing-md);
}

.shopping-category {
    margin-bottom: var(--ios-spacing-xl);
}

.category-header {
    color: var(--ios-text-primary);
    font-size: 22px;
    font-weight: 600;
    margin-bottom: var(--ios-spacing-md);
    padding-bottom: var(--ios-spacing-md);
    border-bottom: 0.5px solid var(--ios-separator);
    display: flex;
    align-items: center;
    gap: var(--ios-spacing-md);
    line-height: 1.27273;
    letter-spacing: 0.352px;
}

.category-items {
    display: flex;
    flex-direction: column;
    gap: var(--ios-spacing-sm);
}

.shopping-item {
    display: flex;
    align-items: center;
    gap: var(--ios-spacing-md);
    padding: var(--ios-spacing-md);
    background: var(--ios-bg-tertiary);
    backdrop-filter: var(--ios-blur-medium);
    -webkit-backdrop-filter: var(--ios-blur-medium);
    border: 0.5px solid var(--ios-separator);
    border-radius: 14px;
    transition: transform 0.2s;
    cursor: pointer;
    box-shadow: var(--ios-shadow-sm);
    min-height: var(--ios-touch);
    -webkit-tap-highlight-color: transparent;
}

.shopping-item:active {
    background: var(--ios-bg-elevated);
    transform: scale(0.98);
}

.shopping-item.completed {
    opacity: 0.5;
}

.shopping-item.completed .item-name {
    text-decoration: line-through;
    color: var(--ios-text-secondary);
}

.item-checkbox {
    position: relative;
    flex-shrink: 0;
}

.item-checkbox input[type="checkbox"] {
    width: 24px;
    height: 24px;
    min-width: 24px;
    min-height: 24px;
    cursor: pointer;
    accent-color: var(--ios-blue);
    -webkit-tap-highlight-color: transparent;
}

.item-content {
    flex: 1;
    min-width: 0;
}

.item-name {
    font-weight: 600;
    font-size: 17px;
    color: var(--ios-text-primary);
    margin-bottom: var(--ios-spacing-xs);
    word-break: break-word;
    line-height: 1.47059;
    letter-spacing: -0.022em;
}

.item-details {
    display: flex;
    flex-direction: column;
    gap: var(--ios-spacing-xs);
    align-items: flex-start;
    font-size: 15px;
    color: var(--ios-text-secondary);
    line-height: 1.33337;
    letter-spacing: -0.016em;
}

.item-quantity {
    background: var(--ios-bg-elevated);
    padding: var(--ios-spacing-xs) var(--ios-spacing-md);
    border-radius: 8px;
    font-weight: 500;
    border: 0.5px solid var(--ios-separator);
}

.item-category {
    background: var(--ios-blue);
    color: white;
    padding: var(--ios-spacing-xs) var(--ios-spacing-md);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    line-height: 1.38462;
}

.item-meta {
    font-size: 13px;
    line-height: 1.38462;
    letter-spacing: -0.08px;
}

.item-actions {
    display: flex;
    gap: var(--ios-spacing-sm);
    flex-shrink: 0;
}

.btn-icon {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: var(--ios-spacing-sm);
    border-radius: 8px;
    transition: all 0.2s;
    line-height: 1;
    width: var(--ios-touch);
    height: var(--ios-touch);
    min-width: var(--ios-touch);
    min-height: var(--ios-touch);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ios-text-secondary);
    -webkit-tap-highlight-color: transparent;
}

.btn-icon:active {
    background: var(--ios-bg-hover);
    color: var(--ios-text-primary);
    transform: scale(0.95);
}

.btn-icon.btn-danger:active {
    background: var(--ios-red);
    color: white;
}

.completed-section {
    margin-top: var(--ios-spacing-xl);
    padding-top: var(--ios-spacing-lg);
    border-top: 0.5px solid var(--ios-separator);
}

.completed-items {
    display: flex;
    flex-direction: column;
    gap: var(--ios-spacing-sm);
}

.empty-state {
    text-align: center;
    padding: var(--ios-spacing-2xl) var(--ios-spacing-xl);
    color: var(--ios-text-secondary);
}

.empty-state p {
    font-size: 17px;
    line-height: 1.47059;
}

/* Notifications - iPhone Optimized */
.notification {
    position: fixed;
    top: calc(var(--ios-spacing-lg) + env(safe-area-inset-top));
    right: var(--ios-spacing-md);
    left: var(--ios-spacing-md);
    padding: var(--ios-spacing-md) var(--ios-spacing-lg);
    background: var(--ios-bg-elevated);
    backdrop-filter: var(--ios-blur-heavy);
    -webkit-backdrop-filter: var(--ios-blur-heavy);
    border: 0.5px solid var(--ios-separator);
    border-radius: 14px;
    color: var(--ios-text-primary);
    z-index: 20000;
    opacity: 0;
    transform: translateY(-100%);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: var(--ios-shadow-lg);
    max-width: 100%;
    display: flex;
    align-items: center;
    gap: var(--ios-spacing-md);
    font-size: 17px;
    line-height: 1.47059;
}

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

.notification-success {
    border-left: 3px solid var(--ios-green);
}

.notification-info {
    border-left: 3px solid #64D2FF;
}

/* Contact Photos */
.contact-photo {
    width: 60px;
    height: 60px;
    min-width: 60px;
    min-height: 60px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--ios-blue);
    box-shadow: var(--ios-shadow);
}

/* Birthday Countdown */
.birthday-countdown {
    padding: var(--ios-spacing-sm) var(--ios-spacing-md);
    background: rgba(10, 132, 255, 0.15);
    border-radius: 8px;
    margin-top: var(--ios-spacing-sm);
    font-size: 15px;
    line-height: 1.33337;
    letter-spacing: -0.016em;
}

.birthday-countdown span {
    display: inline-flex;
    align-items: center;
    gap: var(--ios-spacing-sm);
}

.birthday-countdown i {
    color: var(--ios-blue);
}

/* Login Page - iPhone Optimized */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    min-height: -webkit-fill-available;
    padding: var(--ios-spacing-md);
    background: var(--ios-bg-primary);
    padding-top: calc(var(--ios-spacing-md) + env(safe-area-inset-top));
    padding-bottom: calc(var(--ios-spacing-md) + env(safe-area-inset-bottom));
}

.login-container {
    width: 100%;
    max-width: 100%;
}

.login-box {
    background: var(--ios-bg-secondary);
    backdrop-filter: var(--ios-blur-medium);
    -webkit-backdrop-filter: var(--ios-blur-medium);
    padding: var(--ios-spacing-xl) var(--ios-spacing-lg);
    border-radius: 18px;
    box-shadow: var(--ios-shadow-xl);
    border: 0.5px solid var(--ios-separator);
    width: 100%;
}

.login-box h1 {
    text-align: center;
    margin-bottom: var(--ios-spacing-sm);
    color: var(--ios-text-primary);
    font-size: 28px;
    font-weight: 700;
    line-height: 1.21429;
    letter-spacing: 0.36px;
}

.login-box .subtitle {
    text-align: center;
    color: var(--ios-text-secondary);
    margin-bottom: var(--ios-spacing-xl);
    font-size: 17px;
    line-height: 1.47059;
}

/* Error/Success Messages */
.error-message {
    background: var(--ios-red);
    color: white;
    padding: var(--ios-spacing-md) var(--ios-spacing-lg);
    border-radius: 12px;
    margin-top: var(--ios-spacing-md);
    font-size: 17px;
    line-height: 1.47059;
}

.success-message {
    background: var(--ios-green);
    color: white;
    padding: var(--ios-spacing-md) var(--ios-spacing-lg);
    border-radius: 12px;
    margin-top: var(--ios-spacing-md);
    font-size: 17px;
    line-height: 1.47059;
}

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

/* Scrollbar - iPhone Optimized */
::-webkit-scrollbar {
    width: 0;
    height: 0;
    background: transparent;
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Focus states */
*:focus-visible {
    outline: 2px solid var(--ios-blue);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Selection */
::selection {
    background: rgba(10, 132, 255, 0.15);
    color: var(--ios-text-primary);
}

/* Prevent text selection on UI elements */
.nav-link,
.btn,
.dashboard-card,
.card,
.list-item,
.shopping-item {
    -webkit-user-select: none;
    user-select: none;
}

/* Desktop Styles - Scale up from iPhone */
@media (min-width: 768px) {
    .nav-toggle {
        display: none;
    }

    .nav-overlay {
        display: none;
    }

    .nav-menu {
        display: flex;
        position: static;
        background: transparent;
        border: none;
        box-shadow: none;
        padding: 0;
        flex-direction: row;
        gap: var(--ios-spacing-xs);
        top: auto;
        left: auto;
        right: auto;
        bottom: auto;
        width: auto;
        max-width: none;
        transform: translateX(0);
        transition: none;
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    body.menu-open {
        overflow: auto;
        position: static;
        width: auto;
        height: auto;
        touch-action: auto;
    }

    body.menu-open::before {
        display: none;
    }

    .nav-link {
        border-radius: 8px;
        padding: var(--ios-spacing-sm) var(--ios-spacing-md);
        min-height: auto;
        width: auto;
    }

    .nav-link:hover {
        color: var(--ios-text-primary);
        background: var(--ios-bg-hover);
    }

    .main-content {
        max-width: 1400px;
        margin: 0 auto;
        padding: var(--ios-spacing-xl) var(--ios-spacing-lg);
    }

    .page h2 {
        font-size: 34px;
        line-height: 1.23529;
    }

    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--ios-spacing-lg);
    }

    .sensors-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .page-header {
        flex-direction: row;
        align-items: center;
    }

    .btn {
        width: auto;
    }

    .list-item {
        flex-direction: row;
        align-items: center;
    }

    .list-item:hover {
        transform: translateX(4px);
    }

    .list-item-actions {
        width: auto;
        justify-content: flex-end;
    }

    .modal-content {
        max-width: 600px;
        margin: 5% auto;
    }

    .shopping-quick-add {
        flex-direction: row;
    }

    .shopping-quick-add .search-input {
        flex: 1;
    }

    .shopping-controls {
        flex-direction: row;
        align-items: center;
    }

    .shopping-filters {
        flex-direction: row;
        flex: 1;
    }

    .shopping-filters .search-input,
    .shopping-filters select {
        max-width: 200px;
    }

    .shopping-stats {
        justify-content: flex-end;
        width: auto;
    }

    .item-details {
        flex-direction: row;
        align-items: center;
    }

    .notification {
        right: var(--ios-spacing-lg);
        left: auto;
        max-width: 400px;
        transform: translateX(120%);
    }

    .notification.show {
        transform: translateX(0);
    }

    .dashboard-card:hover {
        transform: translateY(-4px);
    }

    .card:hover {
        transform: translateY(-2px);
    }

    .sensor-card:hover {
        transform: translateY(-4px);
    }

    .shopping-item:hover {
        transform: translateX(8px);
    }
}

@media (min-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .sensors-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .search-input {
        max-width: 300px;
    }
}