/* ==========================================================================
   1. CSS VARIABLES & DESIGN TOKENS (Light / Dark Mode)
   ========================================================================== */
:root {
    /* ---------------- Colors: Light Theme (Default) ---------------- */
    --color-bg-primary: #F8FAFC;      /* Slate 50 */
    --color-bg-surface: #FFFFFF;      /* White */
    --color-bg-elevated: #F1F5F9;     /* Slate 100 */
    
    --color-text-primary: #0F172A;    /* Slate 900 */
    --color-text-secondary: #475569;  /* Slate 600 */
    --color-text-inverse: #FFFFFF;    /* White */
    
    --color-brand-primary: #D97706;   /* Amber 600 */
    --color-brand-hover: #B45309;     /* Amber 700 */
    
    --color-call-action: #16A34A;     /* Green 600 */
    --color-call-hover: #15803D;      /* Green 700 */
    
    --color-border: #E2E8F0;          /* Slate 200 */
    
    --color-shadow: rgba(15, 23, 42, 0.08);
    --color-overlay: rgba(15, 23, 42, 0.6);

    /* ---------------- Typography ---------------- */
    --font-fa: 'Vazirmatn', system-ui, -apple-system, sans-serif;
    --font-en: 'Inter', system-ui, -apple-system, sans-serif;
    --font-primary: var(--font-fa); /* Default FA */
    
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-md: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;

    /* ---------------- Spacing & Layout ---------------- */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    
    --container-max: 1320px;
    --header-height: 72px;
    --mobile-bar-height: 64px;

    /* ---------------- Radius & Shadows ---------------- */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-pill: 9999px;
    
    --shadow-sm: 0 1px 2px 0 var(--color-shadow);
    --shadow-md: 0 4px 6px -1px var(--color-shadow), 0 2px 4px -2px var(--color-shadow);
    --shadow-lg: 0 10px 15px -3px var(--color-shadow), 0 4px 6px -4px var(--color-shadow);
    
    /* ---------------- Transitions ---------------- */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease;
}

/* ---------------- Colors: Dark Theme ---------------- */
:root[data-theme="dark"] {
    --color-bg-primary: #0F172A;      /* Slate 900 */
    --color-bg-surface: #1E293B;      /* Slate 800 */
    --color-bg-elevated: #334155;     /* Slate 700 */
    
    --color-text-primary: #F8FAFC;    /* Slate 50 */
    --color-text-secondary: #94A3B8;  /* Slate 400 */
    
    --color-brand-primary: #F59E0B;   /* Amber 500 */
    --color-brand-hover: #D97706;     /* Amber 600 */
    
    --color-call-action: #22C55E;     /* Green 500 */
    --color-call-hover: #16A34A;      /* Green 600 */
    
    --color-border: #334155;          /* Slate 700 */
    
    --color-shadow: rgba(0, 0, 0, 0.4);
    --color-overlay: rgba(0, 0, 0, 0.8);
}

/* Language Override */
:root[lang="en"] {
    --font-primary: var(--font-en);
}

/* ==========================================================================
   2. RESET & BASE STYLES
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    padding-bottom: var(--mobile-bar-height); /* Space for mobile sticky bar */
}


@media (min-width: 640px) {
    body { padding-bottom: 0; }
}

a {
    text-decoration: none;
    color: inherit;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button, input {
    font-family: inherit;
    border: none;
    outline: none;
}

button {
    cursor: pointer;
    background: transparent;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

[hidden] {
    display: none !important;
}

/* ==========================================================================
   3. HEADER & NAVIGATION
   ========================================================================== */
.site-header {
    background-color: var(--color-bg-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 50;
    height: var(--header-height);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.site-header__container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding-inline: var(--space-4);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

/* Logo */
.site-header__logo-link {
    display: flex;
    align-items: center;
}

.site-header__logo-placeholder {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.site-header__logo-text {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-brand-primary);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.site-header__logo-subtext {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    font-weight: 600;
}

/* Global Search */
.site-header__search-wrapper {
    flex: 1;
    max-width: 400px;
    display: none; /* Hidden on small mobile */
}

@media (min-width: 768px) {
    .site-header__search-wrapper { display: block; }
}

.site-header__search-input {
    width: 100%;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-pill);
    background-color: var(--color-bg-elevated);
    border: 1px solid transparent;
    color: var(--color-text-primary);
    font-size: var(--text-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header__search-input:focus {
    border-color: var(--color-brand-primary);
    box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.2);
}

/* Actions */
.site-header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* Buttons (Toggle Theme/Lang) */
.btn-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-pill);
    background-color: var(--color-bg-elevated);
    color: var(--color-text-secondary);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.btn-toggle:hover {
    background-color: var(--color-border);
    color: var(--color-text-primary);
}

.btn-toggle--lang {
    width: auto;
    padding-inline: var(--space-3);
    font-weight: 600;
    font-size: var(--text-xs);
    gap: 4px;
}

.btn-toggle__label--active {
    color: var(--color-brand-primary);
}

.btn-toggle__icon--moon { display: none; }
:root[data-theme="dark"] .btn-toggle__icon--sun { display: none; }
:root[data-theme="dark"] .btn-toggle__icon--moon { display: inline-block; }

/* ==========================================================================
   4. HERO BANNER
   ========================================================================== */
.hero-banner {
    background: linear-gradient(135deg, var(--color-bg-surface) 0%, var(--color-bg-elevated) 100%);
    border-bottom: 1px solid var(--color-border);
    padding-block: var(--space-8);
}

.hero-banner__container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding-inline: var(--space-4);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

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

.hero-banner__subtitle {
    font-size: var(--text-md);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .hero-banner { padding-block: var(--space-12); }
    .hero-banner__title { font-size: var(--text-3xl); }
    .hero-banner__subtitle { font-size: var(--text-lg); }
}

.hero-banner__contact-bar {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    background-color: var(--color-bg-surface);
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    margin: 0 auto;
}

@media (min-width: 640px) {
    .hero-banner__contact-bar {
        flex-direction: row;
    }
}

.hero-banner__contact-label {
    font-weight: 600;
    color: var(--color-text-primary);
    font-size: var(--text-sm);
}

.hero-banner__phones {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
}

/* ==========================================================================
   5. CATALOG & LAYOUT GRID
   ========================================================================== */
.catalog-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-8) var(--space-4);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
    align-items: start;
}

@media (min-width: 1024px) {
    .catalog-container {
        grid-template-columns: 240px 1fr;
        gap: var(--space-8);
    }
}

/* Filters Sidebar */
.catalog-filters {
    background-color: var(--color-bg-surface);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

@media (min-width:1024px){
    .catalog-filters{
        position: sticky;
        top: calc(var(--header-height) + var(--space-4));
    }
}

.catalog-filters__title {
    display: block;
    font-weight: 700;
    margin-bottom: var(--space-4);
    font-size: var(--text-md);
    color: var(--color-text-primary);
}

.catalog-filters__chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

@media (min-width: 1024px) {
    .catalog-filters__chips {
        flex-direction: column;
    }
}

.filter-chip {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-pill);
    background-color: var(--color-bg-elevated);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    text-align: start;
    transition: all var(--transition-fast);
}

.filter-chip:hover {
    background-color: var(--color-border);
    color: var(--color-text-primary);
}

.filter-chip--active {
    background-color: var(--color-brand-primary);
    color: var(--color-text-inverse);
}

.filter-chip--active:hover {
    background-color: var(--color-brand-hover);
    color: var(--color-text-inverse);
}

/* Product Grid */
.product-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--space-4);
}

@media (min-width: 640px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1280px) {
    .product-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ==========================================================================
   6. PRODUCT CARD COMPONENT
   ========================================================================== */
.product-card {
    background-color: var(--color-bg-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Gallery Section */
.product-card__gallery {
    position: relative;
    aspect-ratio: 4/3;
    background-color: var(--color-bg-elevated);
    overflow: hidden;
}

.product-card__gallery-slides {
    display: flex;
    height: 100%;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scrollbar-width: none; /* Firefox */
}

.product-card__gallery-slides::-webkit-scrollbar {
    display: none; /* Chrome/Safari */
}

.product-card__image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    flex: 0 0 100%;
    scroll-snap-align: center;
}

/* Slider Dots */
.product-card__gallery-dots {
    position: absolute;
    bottom: var(--space-2);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--space-1);
    z-index: 10;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-pill);
    background-color: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.8);
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.dot--active {
    background-color: #ff4757;
    transform: scale(1.3);
}

/* Badge */
.product-card__badge {
    position: absolute;
    top: var(--space-3);
    inset-inline-start: var(--space-3);
    background-color: rgba(15, 23, 42, 0.7);
    color: #FFFFFF;
    padding: 2px var(--space-2);
    border-radius: var(--radius-pill);
    font-size: var(--text-xs);
    font-weight: 600;
    backdrop-filter: blur(4px);
    z-index: 10;
}

/* Card Body */
.product-card__body {
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    flex: 1;
}

.product-card__meta {
    margin-bottom: var(--space-2);
}

.product-card__code {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    background-color: var(--color-bg-elevated);
    padding: 2px var(--space-2);
    border-radius: var(--radius-sm);
    display: inline-block;
}

.product-card__code-value {
    font-family: var(--font-en); /* Keep codes in English font */
    color: var(--color-text-primary);
}

.product-card__title {
    font-size: var(--text-md);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-card__description {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Price Section */
.product-card__price-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px dashed var(--color-border);
}

.product-card__price-label {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

/* Numeric Mode */
.product-card__price--numeric {
    display: flex;
    align-items: baseline;
    gap: var(--space-1);
    color: var(--color-brand-primary);
}

.product-card__price-amount {
    font-size: var(--text-xl);
    font-weight: 700;
}

.product-card__price-currency {
    font-size: var(--text-xs);
}

/* Call Mode */
.product-card__price--call {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    background-color: var(--color-bg-elevated);
    color: var(--color-call-action);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-pill);
    font-weight: 700;
    font-size: var(--text-sm);
    transition: background-color var(--transition-fast);
}

.product-card__price--call:hover {
    background-color: var(--color-border);
}

/* Empty State */
.product-grid__empty {
    text-align: center;
    padding: var(--space-12) var(--space-4);
    background-color: var(--color-bg-surface);
    border-radius: var(--radius-lg);
    border: 1px dashed var(--color-border);
    grid-column: 1 / -1;
}

.product-grid__empty-icon {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-4);
}

.product-grid__empty-title {
    font-size: var(--text-xl);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.product-grid__empty-desc {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    max-width: 400px;
    margin-inline: auto;
}

/* ==========================================================================
   7. BUTTONS & LINKS
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
    text-align: center;
    width: 100%;
}

.btn--header-call {
    background-color: var(--color-brand-primary);
    color: var(--color-text-inverse);
    border-radius: var(--radius-pill);
    padding: var(--space-2) var(--space-4);
    width: auto;
}

.btn--header-call:hover {
    background-color: var(--color-brand-hover);
}

.btn--card-call {
    background-color: var(--color-call-action);
    color: var(--color-text-inverse);
}

.btn--card-call:hover {
    background-color: var(--color-call-hover);
    box-shadow: var(--shadow-md);
}

.btn--empty-call {
    background-color: var(--color-brand-primary);
    color: var(--color-text-inverse);
    width: auto;
    padding-inline: var(--space-6);
}

/* Phone Links */
.phone-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text-primary);
    font-family: var(--font-en); /* Numbers standard font */
    font-weight: 700;
    direction: ltr; /* Ensure numbers format correctly */
    transition: color var(--transition-fast);
}

.phone-link:hover {
    color: var(--color-brand-primary);
}

.phone-link--hero {
    font-size: var(--text-lg);
    background-color: var(--color-bg-elevated);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-pill);
}

.phone-link--mobile-direct {
    color: var(--color-call-action);
}

/* ==========================================================================
   8. FOOTER
   ========================================================================== */
.site-footer {
    background-color: var(--color-bg-surface);
    border-top: 1px solid var(--color-border);
    margin-top: var(--space-12);
}

.site-footer__container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-8) var(--space-4);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
}

@media (min-width: 768px) {
    .site-footer__container {
        grid-template-columns: repeat(3, 1fr);
    }
}

.site-footer__logo-text {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-brand-primary);
    display: block;
    margin-bottom: var(--space-4);
}

.site-footer__about {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.site-footer__title {
    font-size: var(--text-md);
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
    font-weight: 700;
}

.site-footer__phone-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.site-footer__phone-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--space-2);
    border-bottom: 1px dashed var(--color-border);
}

.site-footer__phone-label {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.site-footer__hours,
.site-footer__address {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-3);
}

.site-footer__bottom {
    border-top: 1px solid var(--color-border);
    padding: var(--space-4);
    text-align: center;
}

.site-footer__copyright {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
}

/* ==========================================================================
   9. MOBILE STICKY BOTTOM BAR
   ========================================================================== */
.mobile-sticky-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--mobile-bar-height);
    background-color: var(--color-call-action);
    z-index: 100;
    display: flex;
    box-shadow: 0 -4px 10px rgba(0,0,0,0.1);
}

@media (min-width: 640px) {
    .mobile-sticky-bar {
        display: none;
    }
}

.mobile-sticky-bar__link {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    color: var(--color-text-inverse);
    font-weight: 700;
    padding-inline: var(--space-4);
}

.mobile-sticky-bar__text {
    font-size: var(--text-sm);
}

.mobile-sticky-bar__number {
    font-family: var(--font-en);
    direction: ltr;
    background-color: rgba(255,255,255,0.2);
    padding: 2px var(--space-2);
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
}

/* ==========================================================================
   10. MODAL (LIGHTBOX OVERLAY)
   ========================================================================== */
.product-modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    visibility: hidden;
    opacity: 0;
    transition: visibility var(--transition-normal), opacity var(--transition-normal);
}

.product-modal:not([aria-hidden="true"]) {
    visibility: visible;
    opacity: 1;
}

.product-modal__overlay {
    position: absolute;
    inset: 0;
    background-color: var(--color-overlay);
    backdrop-filter: blur(4px);
}

.product-modal__container {
    position: relative;
    background-color: var(--color-bg-surface);
    width: 100%;
    max-width: 800px;
    max-height: 90vh;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
    z-index: 1;
    transform: translateY(20px);
    transition: transform var(--transition-normal);
}

.product-modal:not([aria-hidden="true"]) .product-modal__container {
    transform: translateY(0);
}

.product-modal__close {
    position: absolute;
    top: var(--space-4);
    inset-inline-end: var(--space-4);
    width: 32px;
    height: 32px;
    border-radius: var(--radius-pill);
    background-color: var(--color-bg-elevated);
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    z-index: 10;
    transition: background-color var(--transition-fast);
}

.product-modal__close:hover {
    background-color: var(--color-border);
}

.product-modal__content {
    padding: var(--space-6);
}