/**
 * Listigo Web Application - Main Stylesheet
 * Matches mobile app design system
 */

:root {
    /* Colors - From Design System */
    --primary-light-blue: #64B5F6;
    --primary-blue: #42A5F5;
    --primary-dark-blue: #1E88E5;
    --primary-deep-blue: #1976D2;
    
    --accent-green: #81C784;
    --accent-green-dark: #66BB6A;
    --accent-green-light: #E8F5E9;
    
    --warning-orange: #FFB74D;
    --error-red: #E57373;
    --info-blue: #4FC3F7;
    --purple-accent: #BA68C8;
    
    --text-primary: #212121;
    --text-secondary: #757575;
    --text-hint: #9E9E9E;
    --divider: #E0E0E0;
    --background-light: #FAFAFA;
    --background-white: #FFFFFF;
    
    /* Spacing - 8pt Grid */
    --spacing-xxs: 4px;
    --spacing-xs: 8px;
    --spacing-s: 12px;
    --spacing-m: 16px;
    --spacing-l: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --spacing-xxxl: 64px;
    
    /* Border Radius */
    --radius-small: 8px;
    --radius-medium: 12px;
    --radius-large: 16px;
    --radius-xlarge: 24px;
    --radius-full: 999px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-display: 40px;
    --font-size-headline-1: 28px;
    --font-size-headline-2: 24px;
    --font-size-headline-3: 20px;
    --font-size-body-large: 18px;
    --font-size-body: 16px;
    --font-size-body-small: 14px;
    --font-size-caption: 12px;
    
    /* Shadows */
    --shadow-sm: 0px 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0px 4px 16px rgba(66, 165, 245, 0.3);
    --shadow-lg: 0px 8px 24px rgba(0, 0, 0, 0.12);
    
    /* Transitions */
    --transition-fast: 200ms cubic-bezier(0.4, 0.0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0.0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* Dark Mode */
.dark {
    --text-primary: #FFFFFF;
    --text-secondary: #B3B3B3;
    --text-hint: #666666;
    --divider: #333333;
    --background-light: #121212;
    --background-white: #1E1E1E;
    --shadow-sm: 0px 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0px 4px 16px rgba(66, 165, 245, 0.2);
    --shadow-lg: 0px 8px 24px rgba(0, 0, 0, 0.4);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--background-light);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

/* Navigation */
.main-nav {
    background: var(--background-white);
    border-bottom: 1px solid var(--divider);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-m) var(--spacing-l);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-l);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-s);
    font-size: var(--font-size-headline-3);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary-light-blue), var(--primary-blue));
    position: relative;
}

.logo-icon::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 8px;
    width: 16px;
    height: 3px;
    background: white;
    border-radius: 2px;
    box-shadow: 0 6px 0 white, 0 12px 0 white;
}

.logo-icon::after {
    content: '';
    position: absolute;
    top: 6px;
    left: 6px;
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
    border: 2px solid white;
}

.nav-links {
    display: flex;
    gap: var(--spacing-s);
    flex: 1;
    justify-content: center;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-s) var(--spacing-m);
    border-radius: var(--radius-medium);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
}

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

.nav-link.active {
    color: var(--primary-blue);
    background: rgba(66, 165, 245, 0.1);
}

.nav-user {
    position: relative;
}

.user-menu-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-s);
    padding: var(--spacing-xs) var(--spacing-s);
    border: none;
    background: transparent;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.user-menu-btn:hover {
    background: var(--background-light);
}

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

.user-name {
    font-weight: 500;
    color: var(--text-primary);
}

.user-menu {
    position: absolute;
    top: calc(100% + var(--spacing-xs));
    right: 0;
    background: var(--background-white);
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xs);
    min-width: 200px;
    display: none;
    flex-direction: column;
    z-index: 1000;
}

.user-menu.show {
    display: flex;
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-s);
    padding: var(--spacing-s) var(--spacing-m);
    border: none;
    background: transparent;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-small);
    cursor: pointer;
    transition: background var(--transition-fast);
    font-size: var(--font-size-body);
    font-family: var(--font-family);
}

.user-menu-item:hover {
    background: var(--background-light);
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-l);
}

/* Flash Messages */
.flash-message {
    position: fixed;
    top: 80px;
    right: var(--spacing-l);
    background: var(--background-white);
    border-radius: var(--radius-medium);
    padding: var(--spacing-m);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-m);
    min-width: 300px;
    z-index: 1000;
    animation: slideInRight 0.3s ease-out;
}

.flash-success {
    border-left: 4px solid var(--accent-green);
}

.flash-error {
    border-left: 4px solid var(--error-red);
}

.flash-info {
    border-left: 4px solid var(--info-blue);
}

.flash-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 14px 24px;
    border: none;
    border-radius: var(--radius-full);
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-blue);
    color: white;
    box-shadow: 0px 2px 8px rgba(66, 165, 245, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark-blue);
    box-shadow: 0px 4px 16px rgba(66, 165, 245, 0.4);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

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

.btn-secondary:hover {
    background: rgba(66, 165, 245, 0.1);
}

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

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-sm {
    padding: 8px 16px;
    font-size: var(--font-size-body-small);
}

.btn-lg {
    padding: 16px 32px;
    font-size: var(--font-size-body-large);
}

/* Cards */
.card {
    background: var(--background-white);
    border-radius: var(--radius-large);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-l);
    margin-bottom: var(--spacing-m);
    transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

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

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

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

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-m);
    border: 1px solid var(--divider);
    border-radius: var(--radius-medium);
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    background: var(--background-white);
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-blue);
    border-width: 2px;
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-error {
    color: var(--error-red);
    font-size: var(--font-size-body-small);
    margin-top: var(--spacing-xs);
    display: block;
}

/* Shopping List Card */
.list-card {
    background: var(--background-white);
    border-radius: var(--radius-large);
    padding: var(--spacing-l);
    margin-bottom: var(--spacing-m);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    display: block;
}

.list-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.list-card:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

.list-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary-blue);
}

.list-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.list-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-m);
    margin-bottom: var(--spacing-s);
}

.list-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
    flex-shrink: 0;
}

.list-title {
    font-size: var(--font-size-headline-3);
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.list-progress {
    margin-top: var(--spacing-s);
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--divider);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--accent-green);
    transition: width var(--transition-normal);
}

.progress-text {
    font-size: var(--font-size-body-small);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* List Item */
.list-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-m);
    padding: var(--spacing-m);
    background: var(--background-light);
    border-radius: var(--radius-small);
    margin-bottom: var(--spacing-xs);
    transition: all var(--transition-fast);
    position: relative;
}

.list-item .item-content {
    flex: 1;
    min-width: 0; /* Allow content to shrink */
}

.list-item:hover {
    background: var(--background-white);
    box-shadow: var(--shadow-sm);
}

.list-item.checked {
    background: var(--accent-green-light);
}

.item-checkbox {
    width: 24px;
    height: 24px;
    border: 2px solid var(--divider);
    border-radius: var(--radius-small);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.item-checkbox.checked {
    background: var(--accent-green);
    border-color: var(--accent-green);
}

.item-checkbox.checked::after {
    content: '✓';
    color: white;
    font-size: 16px;
    font-weight: bold;
}

.item-name {
    flex: 1;
    font-size: var(--font-size-body);
    color: var(--text-primary);
}

.list-item.checked .item-name {
    text-decoration: line-through;
    color: var(--text-secondary);
}

.item-quantity {
    font-size: var(--font-size-body-small);
    color: var(--text-secondary);
    margin-left: var(--spacing-xs);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xxxl) var(--spacing-l);
}

.empty-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-l);
    opacity: 0.3;
    color: var(--primary-blue);
}

.empty-title {
    font-size: var(--font-size-headline-2);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-s);
}

.empty-text {
    font-size: var(--font-size-body);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-l);
}

/* Loading */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxxl);
}

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

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

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

/* Responsive */
@media (max-width: 768px) {
    .nav-container {
        flex-wrap: wrap;
        padding: var(--spacing-m);
    }
    
    .nav-links {
        order: 3;
        width: 100%;
        justify-content: space-around;
        margin-top: var(--spacing-s);
    }
    
    .main-content {
        padding: var(--spacing-m);
    }
    
    .list-card {
        padding: var(--spacing-m);
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-s { margin-top: var(--spacing-s); }
.mt-m { margin-top: var(--spacing-m); }
.mt-l { margin-top: var(--spacing-l); }
.mb-s { margin-bottom: var(--spacing-s); }
.mb-m { margin-bottom: var(--spacing-m); }
.mb-l { margin-bottom: var(--spacing-l); }
.hidden { display: none; }
.flex { display: flex; }
.flex-column { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-s { gap: var(--spacing-s); }
.gap-m { gap: var(--spacing-m); }
.gap-l { gap: var(--spacing-l); }

/* Modal improvements */
.modal[aria-hidden="true"] {
    display: none !important;
}

.modal[aria-hidden="false"] {
    display: flex !important;
}

/* Focus trap for modals */
.modal:focus-within {
    outline: none;
}

/* Improved form inputs */
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
    border-color: var(--primary-blue);
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Improved button states */
.btn:active {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Better error states */
.form-input:invalid:not(:placeholder-shown) {
    border-color: var(--error-red);
}

.form-input:valid:not(:placeholder-shown) {
    border-color: var(--accent-green);
}

/* Smooth transitions */
* {
    transition: background-color var(--transition-fast), 
                color var(--transition-fast),
                border-color var(--transition-fast);
}

/* Print styles */
@media print {
    .main-nav,
    .user-menu,
    .btn,
    .modal {
        display: none !important;
    }
}