/* ========================================
   Дом у озера — Стили (обновлённый дизайн)
   ======================================== */

/* === Дизайн-токены (CSS-переменные) === */
:root {
    /* Палитра */
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-primary-light: #60a5fa;
    --color-primary-50: #eff6ff;
    --color-accent: #f59e0b;
    --color-dark: #0f172a;
    --color-light: #f8fafc;

    /* Нейтральные */
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;
    --color-white: #ffffff;

    /* Типографика */
    --font-family: 'Segoe UI', system-ui, -apple-system, Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1.125rem; /* 18px */
    --font-size-lg: 1.25rem;    /* 20px */
    --font-size-xl: 1.5rem;     /* 24px */
    --font-size-2xl: 2rem;      /* 32px */
    --font-size-3xl: 2.5rem;    /* 40px */
    --font-size-4xl: 3rem;      /* 48px */
    --font-size-hero: clamp(2.5rem, 6vw, 4rem);

    --line-height-tight: 1.15;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.75;

    /* Отступы */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --space-5xl: 8rem;

    /* Скругления */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Тени */
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);

    /* Анимации */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.35s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-gray-700);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

/* === Контейнер === */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* === Типографика заголовков === */
h1, h2, h3, h4 {
    color: var(--color-dark);
    line-height: var(--line-height-tight);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-lg);
}

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

/* ========================================
   Навигация
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
    border-bottom: 1px solid transparent;
}

.header--scrolled {
    box-shadow: var(--shadow-md);
    border-bottom-color: var(--color-gray-200);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-xl);
}

.nav__logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-dark);
    transition: color var(--transition-base);
    white-space: nowrap;
}

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

.nav__menu {
    display: flex;
    align-items: center;
    gap: 0;
}

.nav__menu li {
    margin-left: var(--space-xl);
}

.nav__link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-600);
    transition: color var(--transition-base);
    padding: var(--space-sm) 0;
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

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

.nav__link:hover::after {
    width: 100%;
}

.nav__cta {
    display: inline-block;
    margin-left: var(--space-xl);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: 600;
    padding: var(--space-sm) var(--space-xl);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.nav__cta:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

/* Burger (мобильная кнопка) */
.nav__burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
    z-index: 1001;
}

.nav__burger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-dark);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.nav__burger[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav__burger[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}
.nav__burger[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ========================================
   Hero — Первый экран
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    inset: 0;
    background: url('https://images.unsplash.com/photo-1439066615861-d1af74d74000?w=1920&q=80') center center / cover no-repeat;
    z-index: 0;
    transform: scale(1.02);
}

.hero__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(15, 23, 42, 0.65) 0%,
        rgba(15, 23, 42, 0.55) 40%,
        rgba(15, 23, 42, 0.75) 100%
    );
    z-index: 1;
}

.hero__content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 780px;
    padding: 0 var(--space-xl);
    animation: heroFadeIn 1.2s ease-out both;
}

.hero__title {
    font-size: var(--font-size-hero);
    font-weight: 700;
    color: var(--color-white);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-lg);
    letter-spacing: -0.02em;
}

.hero__subtitle {
    font-size: clamp(1rem, 2vw, var(--font-size-lg));
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-3xl);
    max-width: 580px;
    margin-left: auto;
    margin-right: auto;
    line-height: var(--line-height-relaxed);
}

.hero__cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: var(--color-white);
    font-size: var(--font-size-base);
    font-weight: 600;
    padding: var(--space-lg) var(--space-3xl);
    border-radius: var(--radius-full);
    transition: all var(--transition-slow);
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
    min-width: 260px;
}

.hero__cta:hover,
.hero__cta:focus-visible {
    background: var(--color-primary-dark);
    transform: scale(1.05);
    box-shadow: 0 8px 32px rgba(59, 130, 246, 0.55);
}

.hero__cta:focus-visible {
    outline: 3px solid var(--color-white);
    outline-offset: 3px;
}

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

/* ========================================
   О нас
   ======================================== */
.about {
    padding: var(--space-5xl) 0;
    background: var(--color-white);
}

.about__grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-4xl);
    align-items: center;
}

.about__image-wrapper {
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.about__image {
    width: 100%;
    height: 480px;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.about__image-wrapper:hover .about__image {
    transform: scale(1.03);
}

.about__content {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.about__text {
    font-size: var(--font-size-base);
    color: var(--color-gray-600);
    line-height: var(--line-height-relaxed);
}

.about__features {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.about__feature {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: var(--font-size-base);
    color: var(--color-gray-700);
    font-weight: 500;
}

.about__feature-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    color: var(--color-primary);
}

.about__link {
    display: inline-flex;
    align-items: center;
    color: var(--color-primary);
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: color var(--transition-base), gap var(--transition-base);
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.about__link:hover {
    color: var(--color-primary-dark);
    gap: var(--space-md);
}

/* ========================================
   Услуги
   ======================================== */
.services {
    padding: var(--space-5xl) 0;
    background: var(--color-gray-50);
}

.services__subtitle {
    text-align: center;
    font-size: var(--font-size-base);
    color: var(--color-gray-500);
    margin-bottom: var(--space-3xl);
    margin-top: calc(-1 * var(--space-md));
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
}

.service-card {
    background: var(--color-white);
    padding: var(--space-3xl) var(--space-xl) var(--space-2xl);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-slow);
    border: 1px solid var(--color-gray-200);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.service-card__icon-wrapper {
    width: 96px;
    height: 96px;
    margin: 0 auto var(--space-xl);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(59, 130, 246, 0.18));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-card__icon {
    width: 48px;
    height: 48px;
    color: var(--color-primary);
}

.service-card__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-md);
}

.service-card__description {
    font-size: var(--font-size-base);
    color: var(--color-gray-500);
    line-height: var(--line-height-normal);
}

/* ========================================
   Отзывы
   ======================================== */
.testimonials {
    padding: var(--space-5xl) 0;
    background: var(--color-white);
}

.testimonials__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    margin-top: var(--space-3xl);
}

.testimonial {
    background: var(--color-gray-50);
    padding: var(--space-2xl) var(--space-xl);
    border-radius: var(--radius-lg);
    position: relative;
    transition: all var(--transition-slow);
    border: 1px solid var(--color-gray-100);
}

.testimonial::before {
    content: '\201C';
    position: absolute;
    top: var(--space-lg);
    left: var(--space-lg);
    font-size: 3.5rem;
    line-height: 1;
    color: var(--color-primary);
    opacity: 0.25;
    font-family: Georgia, 'Times New Roman', serif;
    pointer-events: none;
}

.testimonial:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.testimonial__text {
    font-size: clamp(1rem, 1.2vw, var(--font-size-lg));
    font-style: italic;
    color: var(--color-gray-600);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-xl);
    position: relative;
    z-index: 1;
}

.testimonial__footer {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.testimonial__author {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-dark);
    font-style: normal;
}

.testimonial__date {
    font-size: var(--font-size-xs);
    color: var(--color-gray-400);
}

/* ========================================
   Контакты
   ======================================== */
.contact {
    padding: var(--space-5xl) 0;
    background: var(--color-gray-50);
}

.contact__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    margin-top: var(--space-3xl);
}

.contact__info {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

.contact__item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-lg);
}

.contact__icon {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    color: var(--color-primary);
}

.contact__label {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-gray-500);
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact__value {
    font-size: var(--font-size-base);
    color: var(--color-dark);
    font-weight: 500;
    transition: color var(--transition-base);
}

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

.contact__form {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.contact__field {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.contact__input-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-gray-700);
}

.contact__input,
.contact__textarea {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    background: var(--color-white);
    color: var(--color-dark);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
    line-height: var(--line-height-normal);
}

.contact__input:focus,
.contact__textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.contact__input::placeholder,
.contact__textarea::placeholder {
    color: var(--color-gray-400);
}

.contact__textarea {
    resize: vertical;
    min-height: 120px;
}

.contact__submit {
    width: 100%;
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    font-family: var(--font-family);
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.contact__submit:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
}

.contact__submit:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--color-dark);
    color: var(--color-white);
    padding: var(--space-4xl) 0 var(--space-2xl);
}

.footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-3xl);
    padding-bottom: var(--space-3xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--color-white);
}

.footer__description {
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.65);
    max-width: 320px;
    line-height: var(--line-height-relaxed);
}

.footer__title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--color-white);
}

.footer__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.footer__list a {
    color: rgba(255, 255, 255, 0.65);
    transition: color var(--transition-base);
    font-size: var(--font-size-sm);
}

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

.footer__list li {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.65);
}

.footer__social-links {
    display: flex;
    gap: var(--space-md);
}

.footer__social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.8);
    transition: all var(--transition-base);
}

.footer__social-link:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-3px);
}

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

.footer__social-link svg {
    width: 20px;
    height: 20px;
}

.footer__bottom {
    padding-top: var(--space-2xl);
    text-align: center;
}

.footer__copyright {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.4);
}

/* ========================================
   Кнопка «Наверх»
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    z-index: 900;
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px);
    transition: all var(--transition-base);
}

.back-to-top--visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
}

.back-to-top:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
}

/* ========================================
   Адаптивность
   ======================================== */

/* Планшеты */
@media (max-width: 1024px) {
    .services__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .testimonials__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer__grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-2xl);
    }
    .footer__brand {
        grid-column: 1 / -1;
    }
}

/* Планшеты (маленькие) */
@media (max-width: 768px) {
    /* Навигация — мобильное меню */
    .nav__burger {
        display: flex;
    }

    .nav__menu {
        position: fixed;
        top: 0;
        right: 0;
        width: 280px;
        height: 100vh;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: 80px var(--space-xl) var(--space-2xl);
        background: var(--color-white);
        box-shadow: var(--shadow-xl);
        transform: translateX(100%);
        transition: transform var(--transition-slow);
        z-index: 1000;
        overflow-y: auto;
    }

    .nav__menu--open {
        transform: translateX(0);
    }

    .nav__menu li {
        margin-left: 0;
        width: 100%;
        border-bottom: 1px solid var(--color-gray-100);
    }

    .nav__link {
        display: block;
        padding: var(--space-lg) 0;
        font-size: var(--font-size-base);
    }

    .nav__cta {
        margin-left: 0;
        margin-top: var(--space-lg);
        text-align: center;
        width: 100%;
        padding: var(--space-md) var(--space-xl);
    }

    /* Разделы */
    .about__grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

    .about__image {
        height: 320px;
    }

    .contact__grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

    .footer__grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

    .hero__cta {
        min-width: 220px;
        padding: var(--space-md) var(--space-2xl);
    }
}

/* Мобильные */
@media (max-width: 480px) {
    .services__grid {
        grid-template-columns: 1fr;
    }
    .testimonials__grid {
        grid-template-columns: 1fr;
    }
    .nav {
        padding: var(--space-md);
    }
    .container {
        padding: 0 var(--space-md);
    }
    .hero__content {
        padding: 0 var(--space-md);
    }
}

/* Пониженная анимация для пользователей с настройкой ОС */
@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;
    }

    .hero__content {
        animation: none;
    }
    .back-to-top {
        transition: none;
    }
}