/* ============================================
   RESPONSIVE STYLES
   Mobile-First Approach
   ============================================ */

/* ============================================
   MOBILE DEVICES (0-480px)
   ============================================ */
@media (max-width: 480px) {
    /* Container */
    .container {
        padding: 0 var(--space-sm);
    }

    /* Typography */
    h1 {
        font-size: var(--font-size-2xl);
    }

    h2 {
        font-size: var(--font-size-xl);
    }

    h3 {
        font-size: var(--font-size-lg);
    }

    /* Header */
    .header-container {
        gap: var(--space-sm);
    }

    .header-logo {
        font-size: var(--font-size-lg);
    }

    .header-cta {
        display: none;
    }

    .header-cta.show {
        display: flex;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-background);
        box-shadow: var(--shadow-md);
        padding: var(--space-sm);
        flex-direction: column;
        z-index: 99;
    }

    .menu-toggle {
        display: block;
    }

    /* Buttons - Touch-friendly размеры */
    .btn {
        padding: 12px 20px;
        min-height: 44px;
        font-size: 15px;
        width: 100%;
    }

    .btn-large {
        padding: 16px 24px;
        min-height: 48px;
        font-size: 17px;
    }

    .btn-primary,
    .btn-secondary {
        min-width: 120px;
    }

    /* Sections */
    .section {
        padding: var(--space-md) 0;
    }

    /* Accordion */
    .accordion-toggle {
        padding: var(--space-sm) var(--space-md);
    }

    .accordion-text {
        font-size: 15px;
    }

    .accordion-icon {
        font-size: 20px;
    }

    .accordion-heading {
        font-size: 18px;
    }

    /* Process Steps */
    .process-steps {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }

    .process-step {
        padding: var(--space-md);
    }

    .process-step-number {
        width: 48px;
        height: 48px;
        font-size: var(--font-size-xl);
    }

    /* Trust Badges */
    .trust-badges {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .trust-badge {
        width: 100%;
        justify-content: center;
    }

    /* Recommended Section */
    .recommended-section {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .recommended-offers {
        grid-template-columns: 1fr;
    }

    /* Promo Block */
    .promo-block {
        position: static;
        padding: var(--space-md);
    }

    .promo-gift-image {
        width: 100px;
        height: 100px;
    }

    .promo-text {
        font-size: 16px;
    }

    .promo-highlight {
        font-size: 18px;
    }

    /* Offers Grid */
    .offers-grid {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }

    /* Offer Card */
    .offer-card {
        padding: var(--space-sm);
    }

    .offer-card-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .offer-logo {
        width: 100%;
        height: auto;
    }

    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-md);
        text-align: center;
    }

    .footer-links {
        text-align: center;
    }

    /* Filters */
    .filters-grid {
        grid-template-columns: 1fr;
    }

    /* Offer Detail Page */
    .offer-hero-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .offer-hero h1 {
        font-size: 24px;
    }

    .offer-hero-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }

    .parameters-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .requirements-list {
        grid-template-columns: 1fr;
    }

    .cta-buttons {
        flex-direction: column;
        width: 100%;
    }

    .cta-buttons .btn {
        width: 100%;
    }
}

/* ============================================
   TABLET DEVICES (481px - 768px)
   ============================================ */
@media (min-width: 481px) and (max-width: 768px) {
    /* Container */
    .container {
        padding: 0 var(--space-md);
    }

    /* Typography */
    h1 {
        font-size: var(--font-size-3xl);
    }

    h2 {
        font-size: var(--font-size-2xl);
    }

    /* Header */
    .header-cta {
        display: flex;
    }

    .menu-toggle {
        display: none;
    }

    /* Process Steps */
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }

    /* Recommended Section */
    .recommended-section {
        grid-template-columns: 1fr;
    }

    .recommended-offers {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Promo Block */
    .promo-block {
        position: static;
        margin-top: var(--space-md);
    }

    /* Offers Grid */
    .offers-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Footer */
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Filters */
    .filters-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Offer Detail Page */
    .parameters-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .requirements-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   SMALL DESKTOP (769px - 1024px)
   ============================================ */
@media (min-width: 769px) and (max-width: 1024px) {
    /* Process Steps */
    .process-steps {
        grid-template-columns: repeat(4, 1fr);
    }

    /* Recommended Section */
    .recommended-section {
        grid-template-columns: 2fr 1fr;
    }

    .recommended-offers {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Offers Grid */
    .offers-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* Footer */
    .footer-content {
        grid-template-columns: repeat(3, 1fr);
    }

    /* Filters */
    .filters-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* Offer Detail Page */
    .parameters-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .requirements-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   LARGE DESKTOP (1025px+)
   ============================================ */
@media (min-width: 1025px) {
    /* Process Steps */
    .process-steps {
        grid-template-columns: repeat(4, 1fr);
    }

    /* Recommended Section */
    .recommended-section {
        grid-template-columns: 2fr 1fr;
    }

    .recommended-offers {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Offers Grid */
    .offers-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* Footer */
    .footer-content {
        grid-template-columns: repeat(4, 1fr);
    }

    /* Filters */
    .filters-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    /* Offer Detail Page */
    .parameters-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .requirements-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   EXTRA LARGE DESKTOP (1200px+)
   ============================================ */
@media (min-width: 1200px) {
    /* Offers Grid - можно 4 колонки для больших экранов */
    .offers-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* Recommended offers - 3 колонки на очень больших экранах */
    .recommended-offers {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .header,
    .footer,
    .promo-block,
    .btn,
    .menu-toggle {
        display: none;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
    }

    .container {
        max-width: 100%;
        padding: 0;
    }

    a {
        color: #000;
        text-decoration: underline;
    }

    .offer-card,
    .card {
        box-shadow: none;
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}

/* ============================================
   ACCESSIBILITY - High Contrast Mode
   ============================================ */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #0066cc;
        --color-text: #000000;
        --color-background: #ffffff;
        --color-border: #000000;
    }

    .btn {
        border-width: 3px;
    }

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

/* ============================================
   VERY SMALL SCREENS (<360px) - iPhone SE, старые Android
   ============================================ */
@media (max-width: 360px) {
    /* Уменьшить заголовки */
    h1 {
        font-size: 22px !important;
    }

    h2 {
        font-size: 18px !important;
    }

    h3 {
        font-size: 16px !important;
    }

    /* Уменьшить hero логотип на деталях оффера */
    .offer-hero-logo {
        width: 90px !important;
        height: 60px !important;
    }

    /* Уменьшить промо-блок */
    .promo-gift-image {
        width: 80px !important;
        height: 80px !important;
    }

    .promo-text {
        font-size: 14px !important;
    }

    .promo-highlight {
        font-size: 16px !important;
    }

    /* Уменьшить padding в карточках */
    .offer-card {
        padding: 10px !important;
    }

    .offer-card-header {
        margin-bottom: 8px !important;
    }

    /* Уменьшить отступы в контейнере */
    .container {
        padding: 0 12px !important;
    }

    /* Уменьшить размер логотипа в хедере */
    .header-logo {
        font-size: 16px !important;
    }

    /* Уменьшить кнопки */
    .btn {
        padding: 10px 16px !important;
        font-size: 14px !important;
    }

    /* Уменьшить отступы секций */
    .section {
        padding: var(--space-sm) 0 !important;
    }

    /* Оптимизировать аккордеон */
    .accordion-text {
        font-size: 13px !important;
    }

    .accordion-heading {
        font-size: 16px !important;
    }

    /* Уменьшить offer-highlight-box */
    .offer-highlight-value {
        font-size: 20px !important;
    }

    .offer-highlight-label,
    .offer-highlight-sublabel {
        font-size: 11px !important;
    }
}

/* ============================================
   ACCESSIBILITY - Keyboard Navigation & Focus States
   ============================================ */
/* Улучшенная доступность - фокус для keyboard navigation */
.btn:focus-visible,
.menu-toggle:focus-visible,
.accordion-toggle:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

/* Убрать outline при клике мышью */
.btn:focus:not(:focus-visible),
.menu-toggle:focus:not(:focus-visible),
.accordion-toggle:focus:not(:focus-visible) {
    outline: none;
}

/* Визуальный индикатор для интерактивных элементов */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Focus для карточек офферов */
.offer-card:focus-within {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.3);
    outline: 2px solid var(--color-primary);
}

/* Улучшенный hover для keyboard навигации */
.btn:focus-visible:hover,
button:focus-visible:hover {
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.3);
}

/* ============================================
   ACCESSIBILITY - Reduced Motion
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .offer-card:hover,
    .card:hover {
        transform: none;
    }
}

/* ============================================
   LANDSCAPE ORIENTATION (Mobile)
   ============================================ */
@media (max-width: 768px) and (orientation: landscape) {
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }

    .recommended-offers,
    .offers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}