/**
 * Component Styles - Al Paso Billar POS
 * 
 * Contains styles for:
 * - Modal (fullscreen)
 * - Navbar (fixed top)
 * - Card (list items)
 * - Form (with error states)
 * - Button (touch-friendly)
 * 
 * Requirements: 9.2, 9.3, 9.4
 */

/* ==========================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
    /* Colors - Dark Theme */
    --color-bg-primary: #1a1a2e;
    --color-bg-secondary: #16213e;
    --color-bg-tertiary: #0f3460;
    --color-bg-card: #1e2a4a;
    --color-bg-input: #0d1b2a;
    --color-bg-overlay: rgba(0, 0, 0, 0.85);
    
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0aec0;
    --color-text-muted: #718096;
    
    --color-accent-primary: #e94560;
    --color-accent-secondary: #ff6b6b;
    --color-accent-success: #48bb78;
    --color-accent-warning: #ed8936;
    --color-accent-error: #fc8181;
    --color-accent-info: #63b3ed;
    
    --color-border: #2d3748;
    --color-border-focus: #e94560;
    --color-border-error: #fc8181;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Touch-friendly target size (min 44x44px per WCAG) */
    --touch-target-min: 44px;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.5);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, 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;
    
    /* Z-Index Scale */
    --z-navbar: 100;
    --z-modal: 200;
    --z-toast: 300;
    --z-loading: 400;
}


/* ==========================================================================
   MODAL COMPONENT
   Fullscreen modal covering 100% viewport
   Requirement 9.3
   ========================================================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height for mobile browsers */
    background-color: var(--color-bg-overlay);
    z-index: var(--z-modal);
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal.is-active {
    opacity: 1;
    visibility: visible;
}

.modal[aria-hidden="true"] {
    opacity: 0;
    visibility: hidden;
}

.modal[aria-hidden="false"] {
    opacity: 1;
    visibility: visible;
}

.modal__content {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
    background-color: var(--color-bg-primary);
    transform: translateY(100%);
    transition: transform var(--transition-slow);
}

.modal.is-active .modal__content {
    transform: translateY(0);
}

.modal__header {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    min-height: var(--touch-target-min);
    gap: var(--spacing-md);
}

.modal__close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    flex-shrink: 0;
}

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

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

.modal__title {
    flex: 1;
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.modal__body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    -webkit-overflow-scrolling: touch;
}


/* ==========================================================================
   NAVBAR COMPONENT
   Fixed top navigation bar
   Requirement 9.2
   ========================================================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    z-index: var(--z-navbar);
    min-height: var(--touch-target-min);
    gap: var(--spacing-sm);
}

.navbar__back,
.navbar__menu {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    flex-shrink: 0;
}

.navbar__back:hover,
.navbar__back:focus,
.navbar__menu:hover,
.navbar__menu:focus {
    background-color: var(--color-bg-tertiary);
    color: var(--color-accent-primary);
}

.navbar__back:focus,
.navbar__menu:focus {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 2px;
}

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

.navbar__title {
    flex: 1;
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-align: center;
}

/* Add padding to main content to account for fixed navbar */
.main-content {
    padding-top: calc(var(--touch-target-min) + var(--spacing-sm) * 2);
}


/* ==========================================================================
   CARD COMPONENT
   Card components for lists
   Requirements: 9.1, 9.4
   ========================================================================== */

.card {
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

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

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

/* Navigation Card - used in home grid */
.card--nav {
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
    text-decoration: none;
    color: var(--color-text-primary);
    min-height: 140px;
    cursor: pointer;
}

.card--nav:hover,
.card--nav:focus {
    border-color: var(--color-accent-primary);
    background-color: var(--color-bg-tertiary);
}

.card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent-primary);
}

.card__title {
    margin: 0 0 var(--spacing-xs);
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.card__subtitle {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* List Card - used in product/inventory lists */
.card--list {
    flex-direction: row;
    align-items: center;
    padding: var(--spacing-md);
    gap: var(--spacing-md);
}

.card--list .card__image {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.card--list .card__content {
    flex: 1;
    min-width: 0; /* Allow text truncation */
}

.card--list .card__title {
    font-size: var(--font-size-base);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card--list .card__subtitle {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Card Actions */
.card__actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.card__action {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.card__action:hover,
.card__action:focus {
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
}

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

.card__action--danger:hover,
.card__action--danger:focus {
    border-color: var(--color-accent-error);
    color: var(--color-accent-error);
}


/* ==========================================================================
   FORM COMPONENT
   Form styling with error states
   Requirements: 1.8, 5.4, 5.5, 5.6
   ========================================================================== */

.form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form__group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form__label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.form__label--required::after {
    content: ' *';
    color: var(--color-accent-primary);
}

.form__input,
.form__textarea,
.form__select {
    width: 100%;
    min-height: var(--touch-target-min);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form__input::placeholder,
.form__textarea::placeholder {
    color: var(--color-text-muted);
}

.form__input:hover,
.form__textarea:hover,
.form__select:hover {
    border-color: var(--color-text-muted);
}

.form__input:focus,
.form__textarea:focus,
.form__select:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.2);
}

/* Error State */
.form__input--error,
.form__textarea--error,
.form__select--error {
    border-color: var(--color-border-error);
}

.form__input--error:focus,
.form__textarea--error:focus,
.form__select--error:focus {
    border-color: var(--color-border-error);
    box-shadow: 0 0 0 3px rgba(252, 129, 129, 0.2);
}

.form__error {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-accent-error);
    margin-top: var(--spacing-xs);
}

.form__error-icon {
    flex-shrink: 0;
}

/* Textarea specific */
.form__textarea {
    min-height: 100px;
    resize: vertical;
}

/* Select specific */
.form__select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23a0aec0' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-sm) center;
    padding-right: calc(var(--touch-target-min));
}

/* File Input */
.form__file {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form__file-input {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.form__file-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xl);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    background-color: var(--color-bg-input);
    color: var(--color-text-secondary);
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
    min-height: 120px;
}

.form__file-input:hover + .form__file-label,
.form__file-input:focus + .form__file-label {
    border-color: var(--color-border-focus);
    background-color: var(--color-bg-tertiary);
}

.form__file-input:focus + .form__file-label {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 2px;
}

/* Form Actions */
.form__actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.form__actions--sticky {
    position: sticky;
    bottom: 0;
    background-color: var(--color-bg-primary);
    margin: var(--spacing-lg) calc(var(--spacing-lg) * -1);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}


/* ==========================================================================
   BUTTON COMPONENT
   Touch-friendly targets (min 44x44px)
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    min-width: var(--touch-target-min);
    min-height: var(--touch-target-min);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    font-family: inherit;
    text-decoration: none;
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.btn:active {
    transform: scale(0.98);
}

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

/* Button Variants */
.btn--primary {
    background-color: var(--color-accent-primary);
    color: var(--color-text-primary);
    border-color: var(--color-accent-primary);
}

.btn--primary:hover:not(:disabled) {
    background-color: var(--color-accent-secondary);
    border-color: var(--color-accent-secondary);
}

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

.btn--secondary:hover:not(:disabled) {
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-text-muted);
}

.btn--danger {
    background-color: transparent;
    color: var(--color-accent-error);
    border-color: var(--color-accent-error);
}

.btn--danger:hover:not(:disabled) {
    background-color: var(--color-accent-error);
    color: var(--color-text-primary);
}

.btn--success {
    background-color: var(--color-accent-success);
    color: var(--color-text-primary);
    border-color: var(--color-accent-success);
}

.btn--success:hover:not(:disabled) {
    background-color: #38a169;
    border-color: #38a169;
}

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

.btn--ghost:hover:not(:disabled) {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

/* Button Sizes */
.btn--sm {
    min-height: 36px;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn--lg {
    min-height: 52px;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

/* Full Width Button */
.btn--block {
    width: 100%;
}

/* Icon Button */
.btn--icon {
    padding: 0;
    width: var(--touch-target-min);
    height: var(--touch-target-min);
}

/* Button with icon */
.btn__icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.btn--lg .btn__icon {
    width: 24px;
    height: 24px;
}


/* ==========================================================================
   LOADING COMPONENT
   ========================================================================== */

.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    background-color: var(--color-bg-overlay);
    z-index: var(--z-loading);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.loading.is-active {
    opacity: 1;
    visibility: visible;
}

.loading__spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading__text {
    margin: 0;
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}


/* ==========================================================================
   TOAST NOTIFICATIONS
   ========================================================================== */

.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    left: var(--spacing-md);
    right: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: var(--z-toast);
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    pointer-events: auto;
    animation: toast-slide-in var(--transition-normal) ease;
}

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

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

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

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

.toast__icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
}

.toast--success .toast__icon {
    color: var(--color-accent-success);
}

.toast--error .toast__icon {
    color: var(--color-accent-error);
}

.toast--warning .toast__icon {
    color: var(--color-accent-warning);
}

.toast--info .toast__icon {
    color: var(--color-accent-info);
}

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

.toast__close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast);
}

.toast__close:hover {
    color: var(--color-text-primary);
}

@keyframes toast-slide-in {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}


/* ==========================================================================
   HOME GRID LAYOUT
   Landing page with grid of cards
   Requirement 9.1
   ========================================================================== */

.home-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    padding: var(--spacing-md);
}

@media (min-width: 768px) {
    .home-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-lg);
        padding: var(--spacing-xl);
        max-width: 1200px;
        margin: 0 auto;
    }
}


/* ==========================================================================
   VIEW CONTAINER
   ========================================================================== */

.view {
    display: none;
}

.view--active {
    display: block;
}

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