/* ==========================================================================
   1. RESET & BASE
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #030712;
    --bg-secondary: #0F172A;
    --bg-card: rgba(30, 41, 59, 0.4);
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --accent: #3B82F6;
    --accent-hover: #2563EB;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --border: rgba(148, 163, 184, 0.1);
    --radius: 16px;
    --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, .logo, .stat__number, .process__number {
    font-family: 'Space Grotesk', sans-serif;
    letter-spacing: -0.02em;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ==========================================================================
   2. COMPONENTS — Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn--primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
    position: relative;
    overflow: hidden;
}

.btn--primary::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: 0.6s;
}

.btn--primary:hover::after {
    left: 100%;
}

.btn--primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(59, 130, 246, 0.5);
}

.btn--secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn--secondary:hover {
    background: var(--bg-card);
    border-color: var(--text-secondary);
}

.btn--full { width: 100%; }

.btn--sm {
    padding: 0.5rem 1.25rem;
    font-size: 0.9rem;
    white-space: nowrap;
}

/* ==========================================================================
   3. SECTIONS — Header
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(3, 7, 18, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

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

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav__link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition);
}

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

.nav__link--cta {
    background: var(--accent);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius);
}

.nav__link--cta:hover {
    background: var(--accent-hover);
    color: white;
}

.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.burger span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ==========================================================================
   4. SECTIONS — Hero
   ========================================================================== */
.hero {
    position: relative;
    padding: 180px 0 120px;
    background: var(--bg-primary);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    filter: blur(80px);
    z-index: 0;
    pointer-events: none;
}

.hero__content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero__badge {
    display: inline-block;
    background: var(--bg-card);
    color: var(--accent);
    padding: 0.5rem 1rem;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
    backdrop-filter: blur(8px);
}

.hero__title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #F8FAFC, #94A3B8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero__subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero__actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ==========================================================================
   5. SECTIONS — Stats
   ========================================================================== */
.stats {
    padding: 60px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

.stats__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
}

.stat { text-align: center; }

.stat__number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.stat__label {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.4;
}

/* ==========================================================================
   6. SECTIONS — Shared Layout & Cards
   ========================================================================== */
.services, .cases, .why, .process, .faq {
    padding: 120px 0;
}

/* Чередование фонов для визуального ритма */
.cases, .process, .faq { 
    background: var(--bg-secondary); 
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 4rem;
    text-align: center;
}

.services__grid, .cases__grid, .why__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

/* Единый стиль для всех карточек (Glassmorphism) */
.service-card, .case-card, .why__item, .faq__item {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    transition: var(--transition);
}

.service-card:hover, .case-card:hover, .why__item:hover, .faq__item:hover {
    border-color: rgba(59, 130, 246, 0.4);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.3), 0 0 20px var(--accent-glow);
    transform: translateY(-4px);
}

.service-card__icon, .why__icon {
    width: 56px;
    height: 56px;
    background: var(--accent-glow);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--accent);
}

.service-card__title, .case-card__title, .why__title {
    font-size: 1.35rem;
    margin-bottom: 1rem;
}

.service-card__text, .case-card__text, .why__text {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.service-card__meta {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.service-card__price {
    color: var(--accent);
    font-size: 1.1rem;
    font-weight: 600;
}

/* Cases specific */
.case-card__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.case-card__title {
    font-size: 1.35rem;
    flex: 1;
    min-width: 200px; /* Защита от сжатия на мобильных */
}

/* Стили для кнопки-ссылки кейса */
.case-card__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px; /* Чуть меньше, чем у карточки, для компактности */
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    white-space: nowrap;
    transition: var(--transition);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.case-card__btn svg {
    color: var(--accent);
    transition: var(--transition);
}

.case-card__btn:hover {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
}

/* Микро-анимация: стрелка сдвигается вверх-вправо при наведении */
.case-card__btn:hover svg {
    transform: translate(2px, -2px);
}

.case-card__text strong { 
    color: var(--text-primary); 
}

/* Process specific */
.process__steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2rem;
}

.process__step { position: relative; }

.process__number {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--accent);
    opacity: 0.15;
    line-height: 1;
    margin-bottom: 1rem;
}

.process__title {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.process__text { color: var(--text-secondary); }

/* ==========================================================================
   7. SECTIONS — Contact & Form
   ========================================================================== */
.contact {
    padding: 120px 0;
    /* background наследуется от body (var(--bg-primary)) */
}

.contact__content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact__text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.contact__form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
    text-align: left;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.25rem;
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form__note {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.form__note a { color: var(--accent); }

.contact__info {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.contact__link {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.contact__link:hover {
    color: var(--accent);
    border-color: rgba(59, 130, 246, 0.4);
    box-shadow: 0 0 20px var(--accent-glow);
    transform: translateY(-2px);
}

.contact__icon {
    color: var(--accent);
    flex-shrink: 0;
    transition: var(--transition);
}

.contact__link:hover .contact__icon {
    transform: scale(1.1);
}

/* ==========================================================================
   8. SECTIONS — FAQ (Accordion)
   ========================================================================== */
.faq__grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.faq__question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem 0;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    text-align: left;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: var(--transition);
}

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

.faq__icon {
    font-size: 0.75rem;
    color: var(--accent);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.faq__item.active .faq__icon { transform: rotate(90deg); }
.faq__item.active .faq__question { color: var(--accent); border-bottom-color: var(--accent); }

.faq__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq__item.active .faq__answer { max-height: 300px; }

.faq__answer p {
    padding: 0 0 1.5rem 0;
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1rem;
    margin: 0;
}

/* ==========================================================================
   9. UTILITIES — Sticky Bar & Footer
   ========================================================================== */
.sticky-bottom {
    position: relative;
    transition: var(--transition);
}

.sticky-bottom.is-sticky {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 900;
    box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.4s ease;
}

@keyframes slideUp {
    from { transform: translateY(100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.sticky-placeholder { display: none; }
.sticky-bottom.is-sticky + .sticky-placeholder { display: block; height: 60px; }

.sticky-bar {
    background: rgba(3, 7, 18, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border);
    padding: 0.75rem 0;
}

.sticky-bar__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.sticky-bar__text {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
}

.sticky-bar__icon {
    color: var(--accent);
    flex-shrink: 0;
}

.footer {
    padding: 4rem 0;
    background: var(--bg-primary); /* Изменено для идеального чередования с FAQ */
    border-top: 1px solid var(--border);
}

.footer__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer__tagline {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer__links {
    display: flex;
    gap: 2rem;
}

.footer__links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

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

/* ==========================================================================
   10. RESPONSIVE
   ========================================================================== */
@media (max-width: 768px) {
    .burger { display: flex; }
    
    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 1.5rem;
        padding: 2rem;
        background: rgba(3, 7, 18, 0.98);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border);
        transform: translateY(-150%);
        transition: var(--transition);
    }
    
    .nav.active { transform: translateY(0); }
    
    .hero { padding: 140px 0 80px; }
    .hero__title { font-size: 2.25rem; }
    .hero__subtitle { font-size: 1.1rem; }
    
    .section-title { font-size: 2rem; margin-bottom: 3rem; }
    
    .services, .cases, .why, .process, .faq, .contact {
        padding: 80px 0;
    }
    
    .services__grid, .cases__grid, .why__grid, .process__steps {
        grid-template-columns: 1fr;
    }
    
    .footer__content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer__links { flex-wrap: wrap; justify-content: center; }
}

@media (max-width: 600px) {
    .sticky-bar__content {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }
    .sticky-bar { padding: 1rem 0; }
    
    .faq__question { font-size: 1rem; padding: 1.25rem 0; }
}

/* ==========================================================================
   11. SOCIAL LINKS (Footer & Contact)
   ========================================================================== */
.footer__socials {
    display: flex;
    gap: 1rem;
}

.footer__social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    transition: var(--transition);
}

.footer__social-link:hover {
    color: var(--accent);
    border-color: var(--accent);
    box-shadow: 0 0 15px var(--accent-glow);
    transform: translateY(-2px);
}

/* Адаптив для футера, чтобы соцсети не ломали верстку на мобильных */
@media (max-width: 768px) {
    .footer__content {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    
    .footer__socials {
        justify-content: center;
    }
}