/* ============================================
   ВоздухПро — Современный вариант дизайна
   Стиль: 2024–2025, glassmorphism, мягкие градиенты
   Шрифт: Manrope (локально)
   ============================================ */

@font-face {
    font-family: 'Manrope';
    src: url('fonts/manrope-400.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Manrope';
    src: url('fonts/manrope-500.woff2') format('woff2');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Manrope';
    src: url('fonts/manrope-600.woff2') format('woff2');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Manrope';
    src: url('fonts/manrope-700.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Manrope';
    src: url('fonts/manrope-800.woff2') format('woff2');
    font-weight: 800;
    font-style: normal;
    font-display: swap;
}

/* ============================================
   CSS Reset / Base
   ============================================ */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

ul, ol {
    list-style: none;
}

/* ============================================
   CSS Переменные — Современная палитра
   ============================================ */

:root {
    --primary-color: #0c5ba8;
    --primary-light: #1a7ad4;
    --primary-dark: #063a66;
    --primary-gradient: linear-gradient(135deg, #0c5ba8 0%, #1a7ad4 50%, #0e6bb8 100%);
    --primary-soft: rgba(12, 91, 168, 0.08);

    --accent-color: #f97316;
    --accent-hover: #ea580c;
    --accent-light: #fdba74;
    --accent-soft: rgba(249, 115, 22, 0.12);

    --text-color: #0f172a;
    --text-light: #475569;
    --text-lighter: #94a3b8;
    --text-white: #ffffff;

    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-section: #f1f5f9;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --border-color: #e2e8f0;

    --success-color: #10b981;
    --error-color: #ef4444;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 12px 24px -8px rgba(0, 0, 0, 0.1), 0 4px 8px -4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 24px 48px -12px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 32px 64px -16px rgba(0, 0, 0, 0.18);
    --shadow-card: 0 12px 40px rgba(12, 91, 168, 0.08);
    --shadow-card-hover: 0 24px 56px rgba(12, 91, 168, 0.12);
    --shadow-glow: 0 0 0 1px rgba(12, 91, 168, 0.08);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.45s cubic-bezier(0.4, 0, 0.2, 1);

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    --radius-sm: 0.5rem;
    --radius: 0.75rem;
    --radius-md: 1rem;
    --radius-lg: 1.25rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 1.75rem;
    --radius-full: 9999px;

    --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;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
}

/* ============================================
   Типографика
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-color);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-xl); }

@media (min-width: 768px) {
    h1 { font-size: var(--font-size-5xl); }
    h2 { font-size: var(--font-size-4xl); }
}

@media (min-width: 1024px) {
    h1 { font-size: var(--font-size-6xl); }
}

p {
    margin-bottom: var(--spacing-sm);
}

.highlight {
    color: var(--accent-color);
}

/* ============================================
   Контейнер
   ============================================ */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

@media (min-width: 1440px) {
    .container {
        max-width: 1320px;
    }
}

/* ============================================
   Кнопки
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 14px 28px;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-align: center;
    border-radius: var(--radius-lg);
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
    position: relative;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    color: var(--text-white);
    border-color: transparent;
    box-shadow: 0 4px 14px rgba(249, 115, 22, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(249, 115, 22, 0.4);
}

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

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

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

.btn-outline:hover {
    background: var(--primary-soft);
    color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-hero {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-white);
    border-color: rgba(255, 255, 255, 0.35);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.btn-hero:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

.btn-link {
    background: none;
    color: var(--primary-light);
    padding: 0;
    border: none;
    text-decoration: underline;
    text-underline-offset: 3px;
}

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

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

/* ============================================
   Формы
   ============================================ */

.form-group {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 16px 18px;
    font-size: var(--font-size-base);
    font-family: inherit;
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
    color: var(--text-color);
}

.form-group .form-input {
    padding-top: 22px;
    padding-bottom: 10px;
}

.form-label {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--font-size-base);
    color: var(--text-lighter);
    pointer-events: none;
    transition: var(--transition);
    background: var(--bg-white);
    padding: 0 4px;
}

.form-input:focus + .form-label,
.form-input:not(:placeholder-shown) + .form-label {
    top: 0;
    font-size: var(--font-size-xs);
    color: var(--primary-color);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-soft);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
    margin-bottom: var(--spacing-md);
}

.form-select {
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    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='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
    padding-right: 48px;
}

.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
    line-height: 1.5;
    color: var(--text-light);
    cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    flex-shrink: 0;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.form-checkbox a {
    color: var(--primary-light);
    text-decoration: underline;
}

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

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

.form-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   Заголовки секций
   ============================================ */

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    text-align: center;
    color: var(--text-light);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 768px) {
    .section-title {
        font-size: var(--font-size-4xl);
    }
}

/* ============================================
   Cookie уведомление
   ============================================ */

.cookie-message {
    position: fixed;
    z-index: 1000;
    bottom: 0;
    left: 0;
    max-width: 380px;
    padding: var(--spacing-sm);
}

.cookie-message-inner {
    display: grid;
    justify-items: start;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    padding: var(--spacing-lg);
    line-height: 1.5;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.6);
    max-width: 420px;
}

.cookie-message-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.cookie-message-text {
    color: var(--text-light);
}

.cookie-message-text a {
    color: var(--primary-color);
    text-decoration: underline;
}

.cookie-message-inner .button {
    background: var(--primary-color);
    color: var(--text-white);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid transparent;
}

.cookie-message-inner .button-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.cookie-message-inner .button:hover {
    background: var(--primary-light);
}

.cookie-message-inner .button-outline:hover {
    background: rgba(14, 165, 233, 0.08);
    color: var(--primary-color);
}

/* ============================================
   Header
   ============================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--spacing-sm) 0;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    transition: var(--transition);
}

.header.scrolled {
    padding: var(--spacing-xs) 0;
    box-shadow: var(--shadow);
}

.header .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--primary-color);
}

.logo-img {
    height: 44px;
    width: auto;
}

.logo-text {
    display: inline;
}

.header-tagline {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-light);
    margin: 0;
    text-align: center;
}

.header-contacts {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.header-phone {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    transition: var(--transition);
}

.header-phone:hover {
    color: var(--primary-light);
}

.header-actions {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    justify-content: center;
}

.header-actions .btn {
    padding: 10px 18px;
    font-size: var(--font-size-sm);
}

@media (max-width: 767px) {
    .header {
        padding: 0.5rem 0;
    }

    .header .container {
        gap: 0.45rem;
    }

    .logo {
        font-size: 1rem;
        gap: 0.35rem;
    }

    .logo-img {
        height: 30px;
    }

    .logo-text {
        font-size: 1rem;
        line-height: 1.1;
    }

    .header-tagline {
        font-size: 0.73rem;
        line-height: 1.25;
        margin: 0;
    }

    .header-contacts {
        gap: 0.3rem;
    }

    .header-phone {
        font-size: 1rem;
    }

    .header-actions {
        gap: 0.35rem;
    }

    .header-actions .btn {
        font-size: 0.75rem;
        padding: 0.35rem 0.6rem;
        border-width: 1px;
    }
}

@media (min-width: 768px) {
    .header .container {
        flex-direction: row;
        justify-content: space-between;
    }

    .logo-text {
        display: inline;
    }

    .header-tagline {
        display: block;
    }

    .header-contacts {
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-md);
    }
}

/* ============================================
   Hero
   ============================================ */

.hero {
    background: var(--primary-gradient);
    color: var(--text-white);
    padding: calc(var(--spacing-3xl) + 130px) 0 var(--spacing-3xl);
    position: relative;
    overflow: hidden;
}

@media (max-width: 767px) {
    .hero {
        padding-top: calc(var(--spacing-3xl) + 130px);
    }
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.hero .container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    position: relative;
    z-index: 1;
}

.hero-content {
    text-align: center;
}

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-white);
    line-height: 1.2;
}

.hero-title .highlight {
    color: var(--accent-light);
    font-weight: 700;
}

.hero-subtitle {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-lg);
    opacity: 0.92;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.hero-stat {
    text-align: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.hero-stat:hover {
    background: rgba(255, 255, 255, 0.18);
    transform: translateY(-2px);
}

.hero-stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--text-white);
    line-height: 1;
}

.hero-stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.hero-form {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: var(--spacing-lg);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.5);
    color: var(--text-color);
    position: relative;
    transition: var(--transition);
}

.hero-form:hover {
    box-shadow: 0 32px 64px -16px rgba(0, 0, 0, 0.2);
}

.hero-wave {
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    line-height: 0;
}

.hero-wave svg {
    width: 100%;
    height: 60px;
}

@media (min-width: 768px) {
    .hero {
        padding: calc(var(--spacing-3xl) + 100px) 0 var(--spacing-3xl);
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .hero-wave svg {
        height: 90px;
    }
}

@media (min-width: 1024px) {
    .hero .container {
        flex-direction: row;
        align-items: center;
    }

    .hero-content {
        flex: 1;
        text-align: left;
    }

    .hero-stats {
        justify-content: flex-start;
    }

    .hero-form {
        flex: 0 0 420px;
    }

    .hero-title {
        font-size: var(--font-size-5xl);
    }

    .hero-wave svg {
        height: 120px;
    }
}

/* ============================================
   Гарантии (Bento-style grid option: 2+2)
   ============================================ */

.guarantees {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-light);
}

.guarantees-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.guarantee-card {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-2xl);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.guarantee-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-card-hover);
    border-color: transparent;
}

.guarantee-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    color: var(--text-white);
    box-shadow: 0 8px 24px rgba(12, 91, 168, 0.25);
}

.guarantee-icon svg {
    width: 32px;
    height: 32px;
}

.guarantee-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-color);
}

.guarantee-text {
    color: var(--text-light);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

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

@media (min-width: 1024px) {
    .guarantees-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ============================================
   Как мы работаем (Installation)
   ============================================ */

.installation {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-section);
}

.installation-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    position: relative;
    max-width: 900px;
    margin: 0 auto var(--spacing-xl);
}

.installation-steps::before {
    content: '';
    position: absolute;
    left: 35px;
    top: 40px;
    bottom: 40px;
    width: 3px;
    background: linear-gradient(to bottom, var(--primary-color), var(--primary-light), var(--accent-color));
    border-radius: 3px;
    display: none;
}

.installation-step {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    background: var(--bg-white);
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-card);
    transition: var(--transition);
    position: relative;
    border: 1px solid var(--border-color);
}

.installation-step:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--primary-light);
}

.step-number {
    flex-shrink: 0;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-gradient);
    color: var(--text-white);
    font-size: var(--font-size-3xl);
    font-weight: 800;
    border-radius: var(--radius-full);
    position: relative;
    z-index: 1;
    box-shadow: 0 8px 24px rgba(12, 91, 168, 0.3);
}

.step-content {
    flex: 1;
    padding-top: 0.25rem;
}

.step-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.step-icon {
    width: 28px;
    height: 28px;
    color: var(--primary-light);
    flex-shrink: 0;
}

.step-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: 0;
    color: var(--text-color);
}

.step-text {
    color: var(--text-color);
    font-size: var(--font-size-base);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.step-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.5rem;
}

.step-list li {
    position: relative;
    padding-left: 1.75rem;
    font-size: var(--font-size-sm);
    color: var(--text-light);
    line-height: 1.6;
}

.step-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.35rem;
    width: 16px;
    height: 16px;
    border-radius: var(--radius-sm);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2310b981' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-size: 10px 10px;
    background-repeat: no-repeat;
    background-position: center;
}

.installation-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
}

.feature-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-white);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-color);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.feature-badge svg {
    color: var(--success-color);
}

@media (max-width: 640px) {
    .installation-step {
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
    }

    .step-number {
        width: 56px;
        height: 56px;
        font-size: var(--font-size-xl);
    }

    .step-header {
        flex-wrap: wrap;
    }

    .step-title {
        font-size: var(--font-size-lg);
    }

    .step-text {
        font-size: var(--font-size-sm);
    }
}

@media (min-width: 768px) {
    .installation-steps::before {
        display: block;
    }
}

/* ============================================
   Портфолио
   ============================================ */

.portfolio {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-white);
}

.portfolio-slider {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.portfolio-slider-wrapper {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    background: var(--bg-white);
    touch-action: pan-y pinch-zoom;
    -webkit-overflow-scrolling: touch;
}

.portfolio-slider-track {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
    touch-action: pan-y pinch-zoom;
}

.portfolio-slide {
    touch-action: pan-y pinch-zoom;
}

.portfolio-slide {
    min-width: 100%;
    flex-shrink: 0;
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--bg-light);
    min-height: 400px;
}

.portfolio-slide-image {
    width: 100%;
    height: auto;
    max-height: 600px;
    display: block;
    object-fit: contain;
    flex-shrink: 0;
    pointer-events: none;
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}

.portfolio-slide-caption {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-white);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.portfolio-slide-text {
    color: var(--text-color);
    font-size: 1rem;
    line-height: 1.6;
    margin: 0;
    font-weight: 500;
}

.portfolio-slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.portfolio-slider-btn:hover {
    transform: translateY(-50%) scale(1.1);
    box-shadow: var(--shadow-lg);
    color: var(--primary-dark);
}

.portfolio-slider-btn-prev {
    left: var(--spacing-md);
}

.portfolio-slider-btn-next {
    right: var(--spacing-md);
}

.portfolio-slider-btn svg {
    width: 24px;
    height: 24px;
}

.portfolio-slider-indicators {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

.portfolio-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid var(--primary-color);
    background: transparent;
    cursor: pointer;
    transition: var(--transition);
    padding: 0;
}

.portfolio-indicator:hover {
    background: var(--primary-light);
    transform: scale(1.2);
}

.portfolio-indicator.active {
    background: var(--primary-color);
    width: 32px;
    border-radius: 6px;
}

@media (max-width: 768px) {
    .portfolio-slider {
        padding: 0 var(--spacing-sm);
    }

    .portfolio-slider-btn {
        width: 40px;
        height: 40px;
    }

    .portfolio-slider-btn-prev {
        left: var(--spacing-xs);
    }

    .portfolio-slider-btn-next {
        right: var(--spacing-xs);
    }

    .portfolio-slide {
        min-height: 300px;
    }

    .portfolio-slide-image {
        max-height: 400px;
    }
}

@media (min-width: 1024px) {
    .portfolio-slide {
        min-height: 500px;
    }

    .portfolio-slide-image {
        max-height: 700px;
    }
}

/* ============================================
   Отзывы
   ============================================ */

.testimonials {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-section);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.testimonial-card {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-card);
    position: relative;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.testimonial-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-card-hover);
}

.testimonial-quote {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-md);
    font-size: 80px;
    font-family: Georgia, serif;
    color: var(--primary-color);
    opacity: 0.08;
    line-height: 1;
}

.testimonial-rating {
    display: flex;
    gap: 4px;
    margin-bottom: var(--spacing-md);
}

.testimonial-rating .star {
    width: 20px;
    height: 20px;
    fill: #fbbf24;
}

.testimonial-text {
    color: var(--text-light);
    font-size: var(--font-size-base);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.testimonial-photo {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 3px solid var(--primary-light);
}

.testimonial-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.testimonial-name {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--text-color);
    margin: 0;
}

.testimonial-social img {
    width: 20px;
    height: 20px;
    opacity: 0.7;
    transition: var(--transition);
}

.testimonial-social:hover img {
    opacity: 1;
}

@media (min-width: 768px) {
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   Каталог
   ============================================ */

.catalog {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-white);
}

.catalog-categories {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.catalog-category {
    background: var(--bg-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-xl);
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
}

.catalog-category:hover {
    border-left-color: var(--accent-color);
}

.category-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-color);
}

.category-description {
    color: var(--text-light);
    font-size: var(--font-size-sm);
    margin-bottom: 0;
}

.catalog-note {
    text-align: center;
    color: var(--text-light);
    font-style: italic;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md);
    background: var(--primary-soft);
    border-radius: var(--radius-xl);
}

.catalog-models {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.model-card {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-2xl);
    text-align: center;
    box-shadow: var(--shadow-card);
    transition: var(--transition);
    position: relative;
    border: 1px solid var(--border-color);
}

.model-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--primary-light);
}

.model-card:hover .btn-outline {
    background: var(--primary-color);
    color: var(--text-white);
}

.model-tag {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: 4px 12px;
    font-size: var(--font-size-xs);
    font-weight: 700;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tag-economy {
    background: #dcfce7;
    color: #166534;
}

.tag-inverter {
    background: #dbeafe;
    color: #1e40af;
}

.tag-wifi {
    background: #fef3c7;
    color: #92400e;
}

.model-image {
    width: 100%;
    max-width: 180px;
    height: 140px;
    margin: var(--spacing-sm) auto var(--spacing-md);
    object-fit: contain;
}

.model-name {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-color);
}

.model-code {
    font-size: var(--font-size-sm);
    color: var(--text-lighter);
    margin-bottom: var(--spacing-xs);
}

.model-specs {
    font-size: var(--font-size-sm);
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.catalog-download {
    text-align: center;
}

@media (min-width: 640px) {
    .catalog-categories {
        flex-direction: row;
    }

    .catalog-category {
        flex: 1;
    }

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

@media (min-width: 1024px) {
    .catalog-models {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ============================================
   FAQ
   ============================================ */

.faq {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-section);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.faq-item:hover,
.faq-item.active {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.faq-question {
    width: 100%;
    padding: var(--spacing-md);
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary-color);
}

.faq-icon {
    font-size: var(--font-size-2xl);
    font-weight: 400;
    color: var(--primary-color);
    flex-shrink: 0;
    transition: var(--transition);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    border-radius: var(--radius-full);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
    background: var(--primary-color);
    color: var(--text-white);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p,
.faq-answer ol {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--text-light);
    line-height: 1.7;
}

.faq-answer ol {
    padding-left: var(--spacing-xl);
    margin-top: var(--spacing-xs);
}

.faq-answer li {
    margin-bottom: var(--spacing-xs);
    list-style: decimal;
}

/* ============================================
   Контакты
   ============================================ */

.contacts {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-white);
}

.contacts-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.contacts-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-item {
    padding: var(--spacing-md);
    background: var(--bg-light);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    border: 1px solid var(--border-color);
}

.contact-item::before {
    content: '';
    width: 4px;
    height: 100%;
    min-height: 40px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.contact-label {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--text-lighter);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-value {
    font-size: var(--font-size-base);
    color: var(--text-color);
    margin-bottom: 0;
}

.contact-value a {
    color: var(--primary-color);
    font-weight: 600;
}

.contact-value a:hover {
    color: var(--primary-light);
    text-decoration: underline;
}

.contacts-form {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-color);
}

.map-container {
    width: 100%;
    height: 400px;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.map-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-light), var(--bg-section));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    text-align: center;
    padding: var(--spacing-lg);
}

@media (min-width: 1024px) {
    .contacts-wrapper {
        flex-direction: row;
    }

    .contacts-info {
        flex: 0 0 340px;
    }

    .contacts-form {
        flex: 1;
    }
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--primary-dark);
    color: var(--text-white);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), var(--primary-light), var(--accent-color));
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-logo .logo {
    color: var(--text-white);
}

.footer-logo .logo-img {
    filter: brightness(0) invert(1);
}

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

.footer-phone a {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-white);
    transition: var(--transition);
}

.footer-phone a:hover {
    color: var(--accent-light);
}

.footer-address {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

.footer-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin-top: var(--spacing-sm);
}

.footer-actions span {
    opacity: 0.6;
}

.footer-actions .btn-link {
    color: var(--accent-light);
}

.footer-actions .btn-link:hover {
    color: var(--text-white);
}

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.footer-copyright {
    opacity: 0.7;
}

.footer-privacy {
    color: var(--text-white);
    opacity: 0.7;
    transition: var(--transition);
}

.footer-privacy:hover {
    opacity: 1;
    text-decoration: underline;
}

.footer-legal {
    font-size: var(--font-size-xs);
    opacity: 0.75;
    line-height: 1.5;
    margin-top: var(--spacing-xs);
}

.footer-legal a {
    color: var(--text-white);
    text-decoration: underline;
}

.footer-legal a:hover {
    opacity: 1;
}

.variant-switcher {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

.variant-switcher a {
    color: var(--accent-light);
}

.variant-switcher a:hover {
    color: var(--text-white);
}

@media (min-width: 768px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: flex-start;
    }

    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* ============================================
   Модальные окна
   ============================================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
    animation: fadeIn 0.3s ease;
}

.modal-overlay[hidden] {
    display: none !important;
}

.modal {
    background: var(--bg-white);
    border-radius: var(--radius-2xl);
    max-width: 480px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: slideUp 0.3s ease;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
}

.modal-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 40px;
    height: 40px;
    font-size: var(--font-size-2xl);
    line-height: 1;
    color: var(--text-light);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--bg-light);
    color: var(--text-color);
}

.modal-content {
    padding: var(--spacing-xl);
}

.modal-title {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
    padding-right: var(--spacing-xl);
}

.modal-result {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-weight: 600;
}

.modal-result.success {
    background: #dcfce7;
    color: #166534;
}

.modal-result.error {
    background: #fee2e2;
    color: #991b1b;
}

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

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

/* ============================================
   Анимации при скролле (fade-in)
   ============================================ */

.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.guarantees-grid .fade-in:nth-child(1) { transition-delay: 0s; }
.guarantees-grid .fade-in:nth-child(2) { transition-delay: 0.1s; }
.guarantees-grid .fade-in:nth-child(3) { transition-delay: 0.2s; }
.guarantees-grid .fade-in:nth-child(4) { transition-delay: 0.3s; }

.installation-steps .fade-in:nth-child(1) { transition-delay: 0s; }
.installation-steps .fade-in:nth-child(2) { transition-delay: 0.15s; }
.installation-steps .fade-in:nth-child(3) { transition-delay: 0.3s; }
.installation-steps .fade-in:nth-child(4) { transition-delay: 0.45s; }

/* ============================================
   Кнопка "Наверх"
   ============================================ */

.back-to-top {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 52px;
    height: 52px;
    background: var(--accent-color);
    color: var(--text-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 99;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--accent-hover);
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(249, 115, 22, 0.4);
}

/* ============================================
   Утилиты
   ============================================ */

.hidden {
    display: none !important;
}

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

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

/* Thanks page */
.thanks-section {
    padding: var(--spacing-3xl) 0;
    min-height: 60vh;
    display: flex;
    align-items: center;
}

/* ============================================
   Reduced motion
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }

    .fade-in {
        opacity: 1;
        transform: none;
    }
}

@media (max-width: 374px) {
    :root {
        --font-size-3xl: 1.75rem;
        --font-size-4xl: 2rem;
        --font-size-5xl: 2.25rem;
    }

    .hero-stats {
        gap: var(--spacing-sm);
    }

    .hero-stat {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}