/* CSS Variables for Theme Support */
:root {
    /* Color Palette */
    --color-primary: #D4AC0D;
    --color-secondary: #8D8741;
    --color-accent: #659DBD;
    --color-neutral: #DAAD86;
    --color-light: #FBEEC1;
    
    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: var(--color-light);
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --text-muted: #95a5a6;
    --border-color: #e9ecef;
    --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: 1rem;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #999999;
    --border-color: #444444;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.4);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: var(--transition);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* App Container */
.app {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header Styles */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header__title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header__icon {
    font-size: var(--font-size-3xl);
}

.header__controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

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

/* Welcome Screen */
.welcome {
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.welcome__content {
    max-width: 600px;
    margin: 0 auto;
}

.welcome__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.welcome__description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

.welcome__actions {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

/* Trip List */
.trip-list {
    display: none;
}

.trip-list.active {
    display: block;
}

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

.trip-list__title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
}

.trip-list__controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

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

/* Trip Card */
.trip-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

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

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

.trip-card__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.trip-card__date {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

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

.trip-card__progress {
    margin-bottom: var(--spacing-md);
}

.trip-card__stats {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Trip Details */
.trip-details {
    display: none;
}

.trip-details.active {
    display: block;
}

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

.trip-details__info {
    flex: 1;
    min-width: 200px;
}

.trip-details__title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.trip-details__date {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
}

.trip-details__actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Progress Bar */
.progress-bar {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    height: 40px;
    margin-bottom: var(--spacing-xl);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

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

.progress-bar__text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: 600;
    color: var(--text-primary);
    z-index: 2;
}

/* Checklist Controls */
.checklist-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.checklist-controls__filters {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    flex-wrap: wrap;
}

/* Checklist */
.checklist {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.checklist__category {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

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

.checklist__category-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    text-transform: capitalize;
}

.checklist__category-count {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    background-color: var(--color-neutral);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.checklist__items {
    padding: var(--spacing-md);
}

.checklist__item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    transition: var(--transition);
    margin-bottom: var(--spacing-sm);
}

.checklist__item:hover {
    background-color: var(--bg-tertiary);
}

.checklist__item.completed {
    opacity: 0.7;
}

.checklist__item.completed .checklist__item-name {
    text-decoration: line-through;
}

.checklist__checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.checklist__item-content {
    flex: 1;
}

.checklist__item-name {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.checklist__item-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.checklist__item-actions {
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: var(--transition);
}

.checklist__item:hover .checklist__item-actions {
    opacity: 1;
}

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

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

.btn--primary:hover {
    background-color: var(--color-secondary);
    transform: translateY(-1px);
}

.btn--secondary {
    background-color: var(--color-neutral);
    color: var(--text-primary);
}

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

.btn--ghost {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn--ghost:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn--danger {
    background-color: #e74c3c;
    color: white;
}

.btn--danger:hover {
    background-color: #c0392b;
}

.btn--large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

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

.btn--icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
}

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

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

.form-input,
.form-textarea,
.form-select,
.search-input,
.filter-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus,
.search-input:focus,
.filter-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(212, 172, 13, 0.1);
}

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

.search-input,
.filter-select {
    width: auto;
    min-width: 150px;
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

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

.form-checkbox__checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.form-checkbox input[type="checkbox"]:checked + .form-checkbox__checkmark {
    background-color: var(--color-primary);
    color: white;
}

.form-checkbox input[type="checkbox"]:checked + .form-checkbox__checkmark::after {
    content: '✓';
    font-size: var(--font-size-sm);
    font-weight: bold;
}

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

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal__content {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-hover);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

.modal__content--large {
    max-width: 800px;
}

.modal__content--small {
    max-width: 400px;
}

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

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

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

.modal__close:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.modal__text {
    padding: var(--spacing-lg);
    color: var(--text-primary);
    text-align: center;
}

.modal__actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    padding-top: var(--spacing-lg);
}

/* Template Grid */
.template-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
}

.template-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

.template-card__icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
}

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

.template-card__description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.template-card__items {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

/* Loading Spinner */
.loading {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.loading.active {
    display: flex;
}

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

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

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: 1500;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-hover);
    min-width: 300px;
    max-width: 400px;
    animation: slideInRight 0.3s ease;
}

.toast--success {
    border-left: 4px solid #27ae60;
}

.toast--error {
    border-left: 4px solid #e74c3c;
}

.toast--warning {
    border-left: 4px solid #f39c12;
}

.toast--info {
    border-left: 4px solid var(--color-accent);
}

.toast__content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.toast__message {
    flex: 1;
    color: var(--text-primary);
}

.toast__close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: var(--font-size-lg);
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0;
    margin-top: auto;
}

.footer__text {
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.footer__link {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

.footer__link:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

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

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

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

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

/* Responsive Design */
@media (max-width: 768px) {
    .header__container {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .header__controls {
        justify-content: center;
    }
    
    .trip-list__header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .trip-list__controls {
        justify-content: stretch;
    }
    
    .search-input,
    .filter-select {
        width: 100%;
        min-width: auto;
    }
    
    .trip-details__header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .trip-details__actions {
        justify-content: stretch;
    }
    
    .checklist-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .checklist-controls__filters {
        justify-content: stretch;
    }
    
    .welcome__actions {
        flex-direction: column;
        align-items: center;
    }
    
    .modal__actions {
        flex-direction: column;
    }
    
    .toast-container {
        top: var(--spacing-md);
        right: var(--spacing-md);
        left: var(--spacing-md);
    }
    
    .toast {
        min-width: auto;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .main {
        padding: var(--spacing-md);
    }
    
    .trip-grid {
        grid-template-columns: 1fr;
    }
    
    .template-grid {
        grid-template-columns: 1fr;
    }
    
    .modal {
        padding: var(--spacing-sm);
    }
    
    .modal__content {
        max-height: 95vh;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .modal,
    .toast-container,
    .loading {
        display: none !important;
    }
    
    .main {
        max-width: none;
        padding: 0;
    }
    
    .trip-details__actions,
    .checklist-controls,
    .checklist__item-actions {
        display: none !important;
    }
    
    .checklist__item {
        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 States */
.btn:focus,
.form-input:focus,
.form-textarea:focus,
.form-select:focus,
.search-input:focus,
.filter-select:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.4);
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}