/* ============================
   GLOBAL STYLES & VARIABLES
   ============================ */
:root {
    /* Color Palette */
    --primary: #0072ff;
    --primary-light: #40a1ff;
    --primary-dark: #005cb7;
    --accent: #ff7e5f;
    --accent-light: #ff9e7d;
    --accent-dark: #e05a3b;
    --grey-100: #f8f9fa;
    --grey-200: #e9ecef;
    --grey-300: #dee2e6;
    --grey-400: #ced4da;
    --grey-500: #adb5bd;
    --grey-600: #6c757d;
    --grey-700: #495057;
    --grey-800: #343a40;
    --grey-900: #212529;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Typography */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'DM Sans', sans-serif;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-xxl: 3rem;
    
    /* Borders & Shadows */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1), 0 1px 3px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    
    /* Animations */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Dynamic variables */
    --packing-progress: 0%;
}

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

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

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--grey-800);
    background-color: var(--grey-100);
    background-image: linear-gradient(135deg, var(--grey-100) 0%, #ffffff 100%);
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    color: var(--grey-900);
}

h1 {
    font-size: 2.5rem;
    font-weight: 900;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: var(--space-md);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

/* Button Styles */
button {
    cursor: pointer;
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 1rem;
    border: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.generate-btn {
    background-color: var(--primary);
    color: white;
    padding: 1rem 2rem;
    font-size: 1.125rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin: var(--space-lg) 0;
    width: 100%;
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

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

.action-btn {
    background-color: var(--grey-200);
    color: var(--grey-700);
    padding: 0.5rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    border-radius: var(--radius-md);
}

.action-btn:hover {
    background-color: var(--grey-300);
    color: var(--grey-800);
}

.action-btn i {
    font-size: 0.875rem;
}

/* Form Styles */
.form-group {
    margin-bottom: var(--space-lg);
    position: relative;
    transition: transform var(--transition-normal);
    opacity: 0;
    transform: translateY(20px);
}

.form-group.visible {
    opacity: 1;
    transform: translateY(0);
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
    color: var(--grey-700);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    background-color: white;
    border: 1px solid var(--grey-300);
    border-radius: var(--radius-md);
    color: var(--grey-800);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(0, 114, 255, 0.15);
}

.form-group.focused label {
    color: var(--primary);
}

.form-row {
    display: flex;
    gap: var(--space-lg);
}

.form-row .form-group {
    flex: 1;
}

/* Custom Checkboxes & Toggles */
.activities-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--space-sm);
    margin-top: var(--space-xs);
}

.activity-option {
    display: flex;
    align-items: center;
}

.activity-option input[type="checkbox"] {
    width: auto;
    margin-right: var(--space-xs);
}

.toggle-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-top: var(--space-xs);
}

.toggle-option {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Custom Switch Toggle */
.switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 24px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--grey-300);
    transition: var(--transition-fast);
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: var(--transition-fast);
    border-radius: 50%;
}

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

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

input:checked + .slider:before {
    transform: translateX(24px);
}

/* Layout */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg);
}

header {
    text-align: center;
    padding: var(--space-lg) 0 var(--space-xxl);
    opacity: 0;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
}

header.animated {
    opacity: 1;
    transform: translateY(0);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xs);
}

.logo-icon {
    font-size: 2rem;
    color: var(--primary);
    animation: float 3s ease-in-out infinite;
}

.tagline {
    color: var(--grey-600);
    font-size: 1.125rem;
    margin-top: -0.5rem;
}

main {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xxl);
}

.trip-form-container {
    background-color: white;
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.form-header {
    text-align: center;
    margin-bottom: var(--space-xl);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-normal) 0.2s;
}

.form-header.visible {
    opacity: 1;
    transform: translateY(0);
}

.form-header h2 {
    margin-bottom: var(--space-xs);
    background: linear-gradient(45deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.form-header p {
    color: var(--grey-600);
}

/* Result Section */
.result-section {
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin: 0 auto;
    max-width: 800px;
    width: 100%;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.result-section.hidden {
    display: none;
}

.result-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--grey-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.result-title h2 {
    margin-bottom: var(--space-xs);
}

.result-title p {
    color: var(--grey-600);
    margin-bottom: 0;
}

.result-actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* Category Tabs */
.category-tabs {
    display: flex;
    overflow-x: auto;
    padding: var(--space-md) var(--space-lg);
    gap: var(--space-sm);
    background-color: var(--grey-100);
    scrollbar-width: thin;
    scrollbar-color: var(--grey-400) var(--grey-200);
    position: relative;
    flex-wrap: wrap;
}

.category-tabs::-webkit-scrollbar {
    height: 4px;
}

.category-tabs::-webkit-scrollbar-track {
    background: var(--grey-200);
}

.category-tabs::-webkit-scrollbar-thumb {
    background-color: var(--grey-400);
    border-radius: 4px;
}

.category-tab {
    background-color: transparent;
    color: var(--grey-700);
    padding: var(--space-sm) var(--space-md);
    white-space: nowrap;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.category-tab i {
    font-size: 0.9rem;
}

.category-tab.active {
    background-color: var(--primary);
    color: white;
}

.category-tab:hover:not(.active) {
    background-color: var(--grey-200);
    color: var(--grey-800);
}

.add-custom-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--accent);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-left: auto;
}

.add-custom-btn:hover {
    background-color: var(--accent-dark);
}

/* Items Container */
.items-container {
    padding: var(--space-lg);
    min-height: 300px;
    max-height: 60vh;
    overflow-y: auto;
}

.packing-item {
    display: flex;
    align-items: center;
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    background-color: var(--grey-100);
    transition: all var(--transition-fast);
    animation: fadeIn 0.3s ease-out;
}

.packing-item:hover {
    background-color: var(--grey-200);
}

.packing-item.packed {
    opacity: 0.7;
}

.packing-item.packed .item-name {
    text-decoration: line-through;
    color: var(--grey-600);
}

.item-check {
    margin-right: var(--space-md);
}

.item-check input[type="checkbox"] {
    display: none;
}

.item-check label {
    display: block;
    width: 24px;
    height: 24px;
    border: 2px solid var(--grey-400);
    border-radius: var(--radius-sm);
    cursor: pointer;
    position: relative;
    transition: all var(--transition-fast);
}

.item-check input[type="checkbox"]:checked + label {
    background-color: var(--success);
    border-color: var(--success);
}

.item-check input[type="checkbox"]:checked + label::after {
    content: "✓";
    position: absolute;
    color: white;
    font-size: 1rem;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.item-details {
    flex: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.item-name {
    font-weight: 500;
}

.item-quantity {
    color: var(--grey-600);
    font-size: 0.875rem;
    font-weight: 500;
}

.delete-item-btn {
    background: none;
    color: var(--grey-500);
    margin-left: var(--space-sm);
    padding: var(--space-xs);
    opacity: 0;
    transition: all var(--transition-fast);
}

.packing-item:hover .delete-item-btn {
    opacity: 1;
}

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

/* Packing Stats */
.pack-stats {
    display: flex;
    padding: var(--space-md) var(--space-lg);
    background: linear-gradient(to right, var(--primary-light), var(--primary));
    color: white;
    justify-content: space-around;
    position: relative;
}

.pack-stats::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 4px;
    width: var(--packing-progress);
    background-color: var(--success);
    transition: width var(--transition-normal);
}

.stat {
    text-align: center;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
    margin-bottom: var(--space-xs);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s;

}
.modal-content {
    background-color: white;
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-xl);
    position: relative;
    animation: slideUp 0.3s;
}

.close-modal {
    position: absolute;
    right: var(--space-lg);
    top: var(--space-lg);
    font-size: 1.5rem;
    color: var(--grey-600);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.close-modal:hover {
    color: var(--grey-900);
}

.modal h3 {
    margin-bottom: var(--space-lg);
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    margin-top: var(--space-md);
}

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

/* Footer */
footer {
    text-align: center;
    padding: var(--space-xl) 0;
    color: var(--grey-600);
    font-size: 0.875rem;
    margin-top: var(--space-xxl);
}

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

@keyframes slideUp {
    from { transform: translateY(30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes float {
    0% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
    100% { transform: translateY(0); }
}

/* Ripple effect for buttons */
.ripple {
    position: absolute;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: scale(0);
    animation: ripple 0.6s linear;
    pointer-events: none;
}

@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Print styles */
@media print {
    .app-container {
        padding: 0;
    }
    
    header, .trip-form-container, footer, .result-actions, .category-tabs {
        display: none !important;
    }
    
    .result-section {
        box-shadow: none;
        margin: 0;
        width: 100%;
    }
    
    .items-container {
        max-height: none;
        padding: var(--space-md);
    }
    
    .result-header {
        padding: var(--space-md);
    }
    
    .packing-item {
        page-break-inside: avoid;
    }
    
    .delete-item-btn {
        display: none;
    }
}

/* Responsive styles */
@media (max-width: 768px) {
    :root {
        --space-xxl: 2rem;
    }
    
    html {
        font-size: 14px;
    }
    
    .form-row {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .result-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .result-actions {
        width: 100%;
        justify-content: space-between;
    }
    
    .pack-stats {
        padding: var(--space-sm) var(--space-md);
    }
    
    .stat-value {
        font-size: 1.25rem;
    }
    
    .modal-content {
        padding: var(--space-lg);
    }
}

@media (min-width: 769px) {
    main {
        grid-template-columns: 1fr 1fr;
    }
    
    .result-section {
        margin: 0;
    }
    
    .trip-form-container {
        margin: 0;
    }
}

@media (max-width: 1200px) {
    main {
        grid-template-columns: 1fr;
    }
    
    .trip-form-container,
    .result-section {
        margin: 0 auto;
    }
}