/* =========================================
   ASIS AI — Landing v4
   Premium Dark Graphite · Calm Tech
   No neon, no glass, no glow — restrained elegance
   ========================================= */

@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@300;400;500;600;700;800&display=swap');

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

:root {
    /* Тёмная графитовая база */
    --bg-dark: #0C1018;
    --bg-surface: #131720;
    --bg-card: #181E2A;
    /* Спокойный приглушённый акцент — стальной голубовато-серый */
    --accent: #7EA8BA;
    --accent-hover: #92BDCE;
    --accent-subtle: rgba(126, 168, 186, 0.10);
    /* Тексты */
    --text-primary: #ECF0F5;
    --text-secondary: #8C95A4;
    --text-muted: #565F6E;
    /* Границы — тонкие, элегантные */
    --border: rgba(255, 255, 255, 0.07);
    --border-hover: rgba(255, 255, 255, 0.14);
    /* Утилиты */
    --radius: 1rem;
    --radius-sm: 0.625rem;
    --transition: 0.25s ease;
    --shadow-soft: 0 2px 16px rgba(0, 0, 0, 0.25);
}

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

body {
    font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Starfield Canvas --- */
#starfield {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* --- Container --- */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 2;
}

/* =========================================
   HEADER / NAVIGATION
   ========================================= */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 0 24px;
    transition: var(--transition);
    background: transparent;
}

.site-header.scrolled {
    background: rgba(12, 16, 24, 0.92);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.logo {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.03em;
}

.logo span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: color var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--text-primary);
    transition: width var(--transition);
}

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

.nav-links a:hover::after {
    width: 100%;
}

.nav-cta {
    font-size: 0.85rem;
    font-weight: 600;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    background: var(--text-primary);
    color: var(--bg-dark) !important;
    text-decoration: none;
    transition: var(--transition);
}

.nav-cta:hover {
    opacity: 0.88;
    transform: translateY(-1px);
}

.nav-cta::after {
    display: none !important;
}

/* Mobile menu */
.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}

.burger span {
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* =========================================
   SECTIONS — General
   ========================================= */
section {
    position: relative;
    z-index: 1;
}

h2 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
    text-align: center;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.section-sub {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 620px;
    margin: 0 auto 48px;
    line-height: 1.65;
}

/* =========================================
   BUTTONS
   ========================================= */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    letter-spacing: -0.01em;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-dark);
}

.btn-primary:hover {
    opacity: 0.88;
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--border);
}

.btn-outline:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 18px 44px;
    font-size: 1.05rem;
}

/* =========================================
   HERO
   ========================================= */
.hero {
    padding: 140px 0 100px;
    text-align: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-avatar {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border);
    margin-bottom: 32px;
}

.hero h1 {
    font-size: 2.75rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.15;
    margin-bottom: 16px;
    max-width: 760px;
}

.hero-accent {
    color: var(--accent);
    display: block;
    font-size: 1.3rem;
    font-weight: 600;
    margin-top: 12px;
    letter-spacing: -0.01em;
}

.hero-emphasis {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 14px;
    justify-content: center;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.hero-badges {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    list-style: none;
}

.hero-badges li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 100px;
}

.hero-badges li .badge-icon {
    width: 5px;
    height: 5px;
    background: var(--accent);
    border-radius: 50%;
    flex-shrink: 0;
}

/* =========================================
   PAIN SECTION
   ========================================= */
.pain {
    padding: 100px 0;
    border-top: 1px solid var(--border);
}

.pain-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    max-width: 860px;
    margin: 0 auto 40px;
}

.pain-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 18px 22px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.pain-item:hover {
    border-color: var(--border-hover);
}

.pain-icon {
    flex-shrink: 0;
    width: 6px;
    height: 6px;
    background: #C0564B;
    border-radius: 50%;
    margin-top: 8px;
}

.pain-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.pain-conclusion {
    text-align: center;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.5;
}

/* =========================================
   FEATURES (What AI does)
   ========================================= */
.features {
    padding: 100px 0;
    border-top: 1px solid var(--border);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
}

.feature-card {
    padding: 28px 22px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px);
}

.feature-card .f-icon {
    font-size: 1.5rem;
    margin-bottom: 14px;
    display: block;
}

.feature-card h3 {
    font-size: 0.92rem;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.feature-card p {
    font-size: 0.84rem;
    color: var(--text-secondary);
    line-height: 1.55;
}

/* =========================================
   PRODUCT SHOWCASE
   ========================================= */
.showcase {
    padding: 100px 0;
    border-top: 1px solid var(--border);
}

.showcase-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    max-width: 960px;
    margin: 0 auto;
}

.showcase-item {
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
    background: var(--bg-card);
    height: 360px;
}

.showcase-item:hover {
    border-color: var(--border-hover);
}

.showcase-item img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    object-position: top left;
}

/* =========================================
   CASE STUDY — CAROUSEL
   ========================================= */
.case {
    padding: 100px 0;
    border-top: 1px solid var(--border);
}

.carousel-wrapper {
    position: relative;
    max-width: 820px;
    margin: 0 auto;
}

.carousel-track {
    overflow: hidden;
    border-radius: var(--radius);
}

.carousel-slides {
    display: flex;
    transition: transform 0.45s ease;
}

.carousel-slide {
    min-width: 100%;
    padding: 0;
}

.case-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px 36px;
}

.case-card .case-label {
    display: inline-block;
    padding: 4px 14px;
    background: var(--accent-subtle);
    color: var(--accent);
    border-radius: 100px;
    font-size: 0.72rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.case-card .case-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.case-card .case-story {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.case-card h3 {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 14px;
}

.case-results-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 24px;
}

.case-results-list {
    margin-bottom: 24px;
}

.case-results-list li {
    padding: 6px 0;
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
    list-style: none;
    padding-left: 18px;
    position: relative;
}

.case-results-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--text-muted);
}

.case-metric {
    padding: 16px 12px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    text-align: center;
}

.case-metric .metric-value {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 4px;
}

.case-metric .metric-label {
    font-size: 0.72rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

.case-quote {
    padding: 18px 22px;
    border-left: 2px solid var(--border);
    font-style: italic;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Carousel controls */
.carousel-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-top: 24px;
}

.carousel-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

.carousel-btn:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.carousel-dots {
    display: flex;
    gap: 6px;
}

.carousel-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-muted);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    padding: 0;
}

.carousel-dot.active {
    background: var(--text-secondary);
    width: 20px;
    border-radius: 3px;
}

/* =========================================
   ALTERNATIVES COMPARISON TABLE
   ========================================= */
.alternatives {
    padding: 100px 0;
    border-top: 1px solid var(--border);
}

.alt-table-wrap {
    max-width: 900px;
    margin: 0 auto;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-card);
}

.alt-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.88rem;
}

.alt-table th,
.alt-table td {
    padding: 16px 18px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.alt-table thead th {
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
    text-transform: uppercase;
    padding-bottom: 18px;
}

.alt-table tbody td {
    color: var(--text-secondary);
}

.alt-table tbody td:first-child {
    text-align: left;
    font-weight: 500;
    color: var(--text-primary);
}

.alt-table .alt-highlight {
    background: var(--accent-subtle);
    color: var(--text-primary) !important;
    font-weight: 600;
}

.alt-table thead .alt-highlight {
    color: var(--accent) !important;
    border-bottom: 2px solid var(--accent);
}

.alt-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.015);
}

.alt-table tbody tr:last-child td {
    border-bottom: none;
}

/* =========================================
   IMPLEMENTATION STEPS
   ========================================= */
.steps {
    padding: 100px 0;
    border-top: 1px solid var(--border);
}

.steps-track {
    display: flex;
    gap: 14px;
    max-width: 1000px;
    margin: 0 auto;
}

.step-card {
    flex: 1;
    padding: 28px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.step-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px);
}

.step-num {
    width: 36px;
    height: 36px;
    background: var(--bg-surface);
    color: var(--accent);
    border: 1px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 700;
    margin: 0 auto 14px;
}

.step-card h3 {
    font-size: 0.92rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.step-card p {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* =========================================
   PRICING
   ========================================= */
.pricing {
    padding: 100px 0;
    border-top: 1px solid var(--border);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    padding: 36px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    position: relative;
    transition: var(--transition);
}

.pricing-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-hover);
}

.pricing-card.featured {
    border-color: var(--accent);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: var(--bg-dark);
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.pricing-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 4px;
}

.pricing-sub {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 20px;
}

.pricing-price {
    text-align: center;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 6px;
}

.pricing-period {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.pricing-features {
    list-style: none;
    margin-bottom: 24px;
}

.pricing-features li {
    padding: 8px 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features li::before {
    content: '✓ ';
    color: var(--accent);
    font-weight: 600;
    margin-right: 6px;
}

.pricing-footer {
    text-align: center;
    padding: 14px;
    background: var(--bg-surface);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.pricing-footer strong {
    color: var(--text-primary);
}

/* =========================================
   CTA BLOCK
   ========================================= */
.cta-section {
    padding: 100px 0;
    text-align: center;
    border-top: 1px solid var(--border);
}

.cta-list {
    list-style: none;
    max-width: 480px;
    margin: 0 auto 40px;
}

.cta-list li {
    padding: 10px 0;
    font-size: 0.92rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.cta-list li::before {
    content: '—';
    color: var(--text-muted);
    flex-shrink: 0;
}

/* =========================================
   FAQ
   ========================================= */
.faq {
    padding: 100px 0;
    border-top: 1px solid var(--border);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    max-width: 860px;
    margin: 0 auto;
}

.faq-item {
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--border-hover);
}

.faq-item h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.faq-item p {
    font-size: 0.84rem;
    color: var(--text-secondary);
    line-height: 1.55;
}

/* =========================================
   FOOTER CONTACT (Bottom Buttons)
   ========================================= */
.footer-contact {
    padding: 80px 0;
    text-align: center;
    border-top: 1px solid var(--border);
}

.footer-contact-buttons {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

/* =========================================
   FOOTER
   ========================================= */
.site-footer {
    padding: 40px 0;
    border-top: 1px solid var(--border);
    text-align: center;
    position: relative;
    z-index: 2;
}

.footer-links {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.78rem;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--text-secondary);
}

.site-footer p {
    color: var(--text-muted);
    font-size: 0.78rem;
    margin: 4px 0;
}

.site-footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

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

/* =========================================
   SCROLL REVEAL ANIMATION
   ========================================= */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .steps-track {
        flex-wrap: wrap;
        justify-content: center;
    }

    .step-card {
        flex: 0 0 calc(33.33% - 12px);
    }

    .showcase-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: rgba(12, 16, 24, 0.97);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border);
    }

    .nav-links.open {
        display: flex;
    }

    .burger {
        display: flex;
    }

    .hero {
        padding: 120px 0 70px;
    }

    .hero h1 {
        font-size: 1.85rem;
    }

    .hero-accent {
        font-size: 1.1rem;
    }

    .hero-avatar {
        width: 80px;
        height: 80px;
    }

    h2 {
        font-size: 1.5rem !important;
    }

    .pain-grid,
    .faq-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .steps-track {
        flex-direction: column;
    }

    .step-card {
        flex: 1;
    }

    .case-results-grid {
        grid-template-columns: 1fr 1fr;
    }

    .showcase-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
        max-width: 320px;
    }

    .hero-badges {
        gap: 6px;
    }

    .hero-badges li {
        font-size: 0.72rem;
        padding: 5px 10px;
    }

    .footer-links {
        flex-direction: column;
        gap: 8px;
    }

    .footer-contact-buttons {
        flex-direction: column;
        align-items: center;
    }

    section {
        padding: 70px 0 !important;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.5rem;
    }

    .case-card {
        padding: 24px 18px;
    }

    .case-results-grid {
        grid-template-columns: 1fr;
    }
}