/* ==========================================================================
   Variables & Theme Setup
   ========================================================================== */
:root {
    /* Light Theme Palette */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-accent: #e0f2fe;
    --bg-secondary-rgb: 255, 255, 255;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;

    --primary: #0369a1;
    --primary-hover: #075985;
    --primary-light: #e0f2fe;
    --accent: #06b6d4;

    --whatsapp-color: #0e7c63;
    --whatsapp-hover: #0a5c4b;
    --telegram-color: #006699;
    --telegram-hover: #00557f;

    /* Цвет текста на сплошной primary-заливке */
    --on-primary: #ffffff;

    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 20px rgba(2, 132, 199, 0.2);

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;

    --transition-speed: 0.3s;

    --section-padding: 80px;
    --section-padding-lg: 90px;
}

[data-theme="dark"] {
    /* Dark Theme Palette */
    --bg-primary: #0b1120;
    --bg-secondary: #121c2d;
    --bg-card: #1e293b;
    --bg-accent: #1e3a8a33;
    --bg-secondary-rgb: 18, 28, 45;

    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;

    --primary: #38bdf8;
    --primary-hover: #0284c7;
    --primary-light: #1e3a8a;
    --accent: #22d3ee;

    /* На светлой primary-заливке нужен тёмный текст (8.79:1) */
    --on-primary: #0b1120;

    --border-color: #334155;
    --border-hover: #475569;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4);
    --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.25);
}

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

html {
    scroll-behavior: smooth;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

/* Skip link — виден только при фокусе с клавиатуры */
.skip-link {
    position: absolute;
    top: -100px;
    left: 16px;
    z-index: 200;
    padding: 12px 20px;
    background-color: var(--primary);
    color: var(--on-primary);
    font-weight: 600;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    transition: top 0.2s ease;
}

.skip-link:focus {
    top: 12px;
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(var(--bg-secondary-rgb), 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo-highlight {
    color: var(--primary);
}

.nav {
    display: flex;
    gap: 28px;
}

.nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* Theme Switch Toggle */
.theme-switch-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-primary);
    padding: 6px 10px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
}

.theme-icon {
    font-size: 0.9rem;
    user-select: none;
}

.theme-switch {
    display: inline-block;
    height: 32px;
    position: relative;
    width: 64px;
}

.theme-switch input {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

.slider {
    background-color: #cbd5e1;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .3s;
}

.slider:before {
    background-color: #ffffff;
    bottom: 4px;
    content: "";
    height: 24px;
    left: 4px;
    position: absolute;
    transition: .3s;
    width: 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

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

input:checked + .slider:before {
    transform: translateX(32px);
}

.theme-switch input:focus-visible + .slider {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    text-align: center;
}

.btn-header-contact {
    padding: 8px 18px;
    font-size: 0.9rem;
    background-color: var(--primary);
    color: var(--on-primary);
}

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

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

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

.btn-telegram {
    background-color: var(--telegram-color);
    color: #ffffff;
}

.btn-telegram:hover {
    background-color: var(--telegram-hover);
    box-shadow: 0 4px 15px rgba(0, 136, 204, 0.4);
    transform: translateY(-2px);
}

.btn-whatsapp {
    background-color: var(--whatsapp-color);
    color: #ffffff;
}

.btn-whatsapp:hover {
    background-color: var(--whatsapp-hover);
    box-shadow: 0 4px 15px rgba(37, 211, 102, 0.4);
    transform: translateY(-2px);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    padding: 80px 0 60px;
    background: radial-gradient(circle at 80% 20%, var(--bg-accent) 0%, transparent 50%);
}

.hero-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: center;
}

.badge {
    display: inline-block;
    padding: 6px 14px;
    background-color: var(--bg-accent);
    color: var(--primary);
    font-weight: 600;
    font-size: 0.85rem;
    border-radius: var(--radius-full);
    margin-bottom: 20px;
    border: 1px solid var(--primary-light);
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 28px;
    max-width: 540px;
}

.hero-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 32px;
}

.hero-feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
    color: var(--text-secondary);
}

.check-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 50%;
    font-size: 0.8rem;
    font-weight: bold;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.hero-image-wrapper {
    position: relative;
}

.hero-image-wrapper picture {
    display: block;
}

.hero-img {
    width: 100%;
    height: 420px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.hero-badge {
    position: absolute;
    bottom: -20px;
    left: 16px;
    background-color: var(--bg-card);
    padding: 16px 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.hero-badge-title {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hero-badge-price {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary);
}

/* ==========================================================================
   Products Section
   ========================================================================== */
.products {
    padding: var(--section-padding-lg) 0;
}

.section-title-wrapper {
    text-align: center;
    margin-bottom: 50px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.product-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.product-img-wrapper {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.product-img-wrapper picture {
    display: block;
    height: 100%;
}

.product-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.product-card:hover .product-img {
    transform: scale(1.05);
}

.product-tag {
    position: absolute;
    top: 12px;
    right: 12px;
    background-color: var(--primary);
    color: var(--on-primary);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: var(--radius-full);
}

.tag-green {
    background-color: #047857;
}

.tag-purple {
    background-color: #7c3aed;
}

.product-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.product-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.product-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex-grow: 1;
}

.product-info {
    margin-bottom: 16px;
}

.product-price {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
}

.product-price .currency {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 500;
}

.btn-card {
    width: 100%;
    background-color: var(--bg-accent);
    color: var(--primary);
}

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

/* ==========================================================================
   Calculator Section
   ========================================================================== */
.calculator-section {
    padding: 80px 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.calculator-box {
    max-width: 680px;
    margin: 0 auto;
    background-color: var(--bg-card);
    padding: 40px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.calculator-header {
    text-align: center;
    margin-bottom: 30px;
}

.calculator-header h2 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.calculator-header p {
    color: var(--text-secondary);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-select {
    width: 100%;
    padding: 14px 18px;
    font-size: 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
    cursor: pointer;
    transition: border-color 0.2s ease;
}

.form-select:focus {
    border-color: var(--primary);
}

.weight-input-wrapper {
    display: flex;
    gap: 8px;
    align-items: center;
}

.form-input {
    flex-grow: 1;
    text-align: center;
    padding: 14px;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
}

.form-input:focus {
    border-color: var(--primary);
}

.btn-weight {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-weight: 700;
    padding: 14px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-weight:hover {
    background-color: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
}

.calculator-result {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.result-total {
    border-top: 1px dashed var(--border-color);
    margin-top: 8px;
    padding-top: 14px;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.total-price {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
}

.calculator-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

/* ==========================================================================
   Advantages Section
   ========================================================================== */
.advantages {
    padding: var(--section-padding-lg) 0;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 24px;
}

.adv-card {
    background-color: var(--bg-card);
    padding: 30px 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}

.adv-card:hover {
    transform: translateY(-4px);
}

.adv-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.adv-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.adv-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   Contacts Section
   ========================================================================== */
.contacts {
    padding: var(--section-padding) 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.contacts-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contacts-info h2 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.contacts-desc {
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.contact-card:hover {
    border-color: var(--primary);
    transform: translateX(4px);
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
}

.tg-bg {
    background-color: var(--telegram-color);
}

.wa-bg {
    background-color: var(--whatsapp-color);
}

.contact-details {
    display: flex;
    flex-direction: column;
}

.contact-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.contact-value {
    font-size: 1.1rem;
    font-weight: 700;
}

.contacts-location {
    background-color: var(--bg-card);
    padding: 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 16px;
}

.contacts-location h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.contacts-location p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    padding: 30px 0;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-primary);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    font-size: 1.2rem;
}

.footer-copy {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ==========================================================================
   Responsive Styles
   ========================================================================== */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .hero-img {
        height: 320px;
    }
    .hero-badge {
        bottom: 16px;
        left: 16px;
    }
    .contacts-wrapper {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav {
        display: flex;
        flex-wrap: wrap;
        gap: 12px 20px;
        justify-content: center;
        width: 100%;
        order: 3;
    }
    .header-container {
        flex-wrap: wrap;
        height: auto;
        padding-top: 12px;
        padding-bottom: 12px;
        gap: 12px;
    }
    .calculator-box {
        padding: 24px 16px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .hero-title {
        font-size: 1.8rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .hero-img {
        height: 220px;
    }
    .hero-badge {
        position: relative;
        bottom: auto;
        left: auto;
        margin-top: -30px;
        margin-left: 16px;
        margin-right: 16px;
        width: fit-content;
    }
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    .btn-telegram, .btn-whatsapp {
        width: 100%;
    }
    .weight-input-wrapper {
        flex-wrap: wrap;
        justify-content: center;
    }
    .weight-input-wrapper .btn-weight {
        padding: 10px 12px;
        font-size: 0.9rem;
        flex: 1 1 auto;
        min-width: 44px;
    }
    .weight-input-wrapper .form-input {
        width: 100%;
        order: -1;
        margin-bottom: 8px;
    }
    .calculator-actions {
        grid-template-columns: 1fr;
    }
    .footer-container {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}

/* Уважаем настройку «уменьшить движение» */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}