/* ============================================================
   rvc-sib — стили главной страницы
   Современный дизайн на базе Bootstrap 5
   ============================================================ */

:root {
    --primary: #0d6efd;
    --primary-dark: #0a58ca;
    --accent: #ff7a1a;
    --accent-dark: #e66a0a;
    --dark: #0b1f3a;
    --dark-2: #12294d;
    --light: #f8fafc;
    --text: #334155;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 16px;
    --shadow: 0 10px 30px rgba(2, 12, 27, 0.08);
    --shadow-hover: 0 20px 40px rgba(2, 12, 27, 0.14);
}

/* ===== Базовые стили ===== */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    /* Системный шрифт вместо Google Fonts — не зависит от внешних CDN */
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text);
    background-color: var(--light);
    line-height: 1.6;
    padding-top: 72px;
}

section[id] {
    scroll-margin-top: 80px;
}

/* ===== Навигация ===== */
#mainNav {
    background-color: rgba(11, 31, 58, 0.95);
    backdrop-filter: blur(10px);
    padding-top: 12px;
    padding-bottom: 12px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

#mainNav.scrolled {
    background-color: rgba(11, 31, 58, 0.98);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.brand-icon {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent), #ff9a3d);
    border-radius: 12px;
    color: #fff;
    font-size: 1.4rem;
}

.brand-name {
    font-weight: 800;
    font-size: 1.25rem;
    color: #fff;
    letter-spacing: 0.5px;
}

.brand-tagline {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 0.3px;
}

#mainNav .nav-link {
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
    margin: 0 4px;
    padding: 8px 14px;
    border-radius: 8px;
    transition: color 0.2s, background-color 0.2s;
}

#mainNav .nav-link:hover,
#mainNav .nav-link.active {
    color: #fff;
    background-color: rgba(255, 255, 255, 0.1);
}

/* ===== Кнопки ===== */
.btn-accent {
    background: linear-gradient(135deg, var(--accent), #ff9a3d);
    color: #fff;
    border: none;
    font-weight: 600;
    border-radius: 10px;
    box-shadow: 0 4px 14px rgba(255, 122, 26, 0.35);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-accent:hover,
.btn-accent:focus {
    color: #fff;
    background: linear-gradient(135deg, var(--accent-dark), var(--accent));
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 122, 26, 0.45);
}

.btn-outline-light {
    border-radius: 10px;
    font-weight: 600;
}

.btn-outline-accent {
    color: var(--accent);
    border: 1px solid var(--accent);
    border-radius: 10px;
    font-weight: 600;
    background: transparent;
    transition: background-color 0.2s, color 0.2s, transform 0.2s;
}

.btn-outline-accent:hover,
.btn-outline-accent:focus {
    color: #fff;
    background-color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* ===== Hero ===== */
.hero {
    min-height: calc(100vh - 72px);
    background:
        radial-gradient(circle at 20% 20%, rgba(255, 122, 26, 0.15), transparent 40%),
        radial-gradient(circle at 80% 80%, rgba(13, 110, 253, 0.2), transparent 45%),
        linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
    color: #fff;
    padding: 80px 0;
}

.hero-badge {
    background: rgba(255, 122, 26, 0.15);
    color: #ffb37a;
    border: 1px solid rgba(255, 122, 26, 0.3);
    padding: 8px 16px;
    font-weight: 500;
    font-size: 0.9rem;
}

.hero__title {
    color: #fff;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.hero__subtitle {
    color: rgba(255, 255, 255, 0.85);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Секции ===== */
.section {
    padding: 80px 0;
}

.section--alt {
    background-color: #fff;
}

.section-eyebrow {
    display: inline-block;
    color: var(--accent);
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 8px;
}

.section__title {
    color: var(--dark);
    font-size: 2.25rem;
    margin-bottom: 16px;
}

.section-subtitle {
    max-width: 600px;
    font-size: 1.1rem;
}

.section__text {
    font-size: 1.05rem;
}

/* ===== Услуги ===== */
.service-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.service-icon {
    width: 60px;
    height: 60px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(13, 110, 253, 0.1), rgba(13, 110, 253, 0.05));
    color: var(--primary);
    border-radius: 14px;
    font-size: 1.8rem;
}

.service-card__title {
    color: var(--dark);
}

/* ===== Преимущества ===== */
.advantage {
    background: var(--light);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.advantage-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(255, 122, 26, 0.12), rgba(255, 122, 26, 0.05));
    color: var(--accent);
    border-radius: 50%;
    font-size: 1.8rem;
}

.advantage__title {
    color: var(--dark);
}

/* ===== О компании ===== */
.about-list {
    font-size: 1.05rem;
}

.text-accent {
    color: var(--accent) !important;
}

.about-visual {
    background: linear-gradient(135deg, var(--dark), var(--dark-2));
    color: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow-hover);
}

.about-visual i {
    color: var(--accent);
}

/* ===== Контакты ===== */
.contact-info {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.contact-icon {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(13, 110, 253, 0.1), rgba(13, 110, 253, 0.05));
    color: var(--primary);
    border-radius: 10px;
    font-size: 1.2rem;
}

.contact-link {
    color: var(--dark);
    font-weight: 600;
    text-decoration: none;
    transition: color 0.2s;
}

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

.contact-form {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.contact-form .form-control {
    border-radius: 10px;
    padding: 12px 14px;
    border-color: var(--border);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.contact-form .form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.15);
}

.contact-form .form-label {
    font-weight: 600;
    color: var(--dark);
}

/* ===== Футер ===== */
.footer {
    background-color: var(--dark);
    color: rgba(255, 255, 255, 0.8);
}

.footer__text {
    font-size: 0.95rem;
}

.footer-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-link:hover {
    color: var(--accent);
}

/* ===== Страницы ошибок ===== */
.error-page {
    min-height: calc(100vh - 72px);
    background:
        radial-gradient(circle at 20% 20%, rgba(255, 122, 26, 0.12), transparent 40%),
        radial-gradient(circle at 80% 80%, rgba(13, 110, 253, 0.15), transparent 45%),
        linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
    color: #fff;
    padding: 80px 0;
}

.error-code {
    color: var(--accent);
    font-weight: 800;
    font-size: 6rem;
    line-height: 1;
    text-shadow: 0 4px 30px rgba(255, 122, 26, 0.4);
    margin-bottom: 16px;
}

.error-title {
    color: #fff;
}

.error-text {
    color: rgba(255, 255, 255, 0.85) !important;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    font-size: 1.1rem;
}

@media (max-width: 767.98px) {
    .error-code {
        font-size: 4.5rem;
    }
}

/* ===== Адаптивность ===== */
@media (max-width: 991.98px) {
    #mainNav .navbar-collapse {
        background-color: var(--dark);
        border-radius: 12px;
        padding: 16px;
        margin-top: 12px;
    }

    #mainNav .nav-link {
        padding: 10px 14px;
    }
}

@media (max-width: 767.98px) {
    body {
        padding-top: 64px;
    }

    .hero {
        min-height: auto;
        padding: 60px 0;
    }

    .hero__title {
        font-size: 1.9rem;
    }

    .section {
        padding: 60px 0;
    }

    .section__title {
        font-size: 1.75rem;
    }
}