/* ===== БАЗА ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0b0e14;
    --bg-secondary: #131a24;
    --bg-card: #1c2633;
    --bg-card-hover: #263240;
    --text-primary: #e8edf5;
    --text-secondary: #a0b3cc;
    --text-muted: #6e859e;
    --accent: #6ac9ff;
    --accent-glow: rgba(106, 201, 255, 0.15);
    --border: #2a3a4a;
    --radius: 16px;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

/* ===== ШРИФТЫ ===== */
.gradient-text {
    background: linear-gradient(135deg, var(--accent), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== ШАПКА ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(11, 14, 20, 0.82);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border);
}

.header__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 22px;
    user-select: none;
}

.logo__icon {
    font-size: 28px;
}

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

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

.logo__region {
    color: var(--text-secondary);
    font-size: 18px;
    margin-left: 2px;
}

.nav {
    display: flex;
    gap: 32px;
}

.nav__link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color var(--transition);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition);
}

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

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

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

.burger span {
    display: block;
    width: 28px;
    height: 2.5px;
    background: var(--text-primary);
    border-radius: 4px;
    transition: var(--transition);
}

/* ===== ГЕРОЙ ===== */
.hero {
    padding: 80px 0 64px;
    position: relative;
    overflow: hidden;
}

.hero__inner {
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero__content {
    flex: 1.2;
}

.hero__title {
    font-size: 52px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.hero__subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 520px;
    margin-bottom: 36px;
    line-height: 1.7;
}

.btn {
    display: inline-block;
    padding: 14px 40px;
    border-radius: 40px;
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    transition: all var(--transition);
    cursor: pointer;
    border: none;
}

.btn--primary {
    background: var(--accent);
    color: #0b0e14;
    box-shadow: 0 0 30px rgba(106, 201, 255, 0.25);
}

.btn--primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 50px rgba(106, 201, 255, 0.4);
}

.hero__visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.visual-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    font-size: 44px;
    background: var(--bg-secondary);
    padding: 32px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.visual-grid span {
    background: var(--bg-card);
    padding: 16px;
    border-radius: 12px;
    text-align: center;
    transition: all var(--transition);
}

.visual-grid span:hover {
    background: var(--bg-card-hover);
    transform: scale(1.08);
}

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

.section--alt {
    background: var(--bg-secondary);
}

.section__title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.section__desc {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 48px;
}

/* ===== АККОРДЕОН ===== */
.accordion {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.accordion__item {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: all var(--transition);
}

.accordion__item:hover {
    border-color: var(--text-muted);
}

.accordion__header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font);
    transition: background var(--transition);
    text-align: left;
}

.accordion__header:hover {
    background: rgba(255, 255, 255, 0.03);
}

.accordion__arrow {
    font-size: 20px;
    transition: transform var(--transition);
    color: var(--text-muted);
}

.accordion__item.active .accordion__arrow {
    transform: rotate(180deg);
}

.accordion__body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    padding: 0 24px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.accordion__item.active .accordion__body {
    max-height: 200px;
    padding: 0 24px 20px 24px;
}

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

/* ===== ТАБЫ ===== */
.tabs {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
}

.tabs__nav {
    display: flex;
    border-bottom: 1px solid var(--border);
    background: rgba(0, 0, 0, 0.2);
}

.tabs__btn {
    flex: 1;
    padding: 16px 20px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font);
    border-bottom: 3px solid transparent;
}

.tabs__btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
}

.tabs__btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.tabs__content {
    padding: 28px 32px;
}

.tabs__panel {
    display: none;
    color: var(--text-secondary);
    line-height: 1.8;
}

.tabs__panel.active {
    display: block;
}

.tabs__panel h3 {
    color: var(--text-primary);
    font-size: 22px;
    margin-bottom: 12px;
}

/* ===== КАРТОЧКИ ===== */
.cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 30px 28px;
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.card:hover {
    transform: translateY(-6px);
    border-color: var(--text-muted);
    background: var(--bg-card-hover);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.card__icon {
    font-size: 40px;
    margin-bottom: 14px;
    display: block;
}

.card__title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}

.card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

/* ===== ФУТЕР ===== */
.footer {
    border-top: 1px solid var(--border);
    padding: 48px 0 24px;
    background: var(--bg-primary);
}

.footer__inner {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.footer__info {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-width: 400px;
}

.footer__info p {
    color: var(--text-secondary);
    font-size: 15px;
}

.logo--footer .logo__text {
    font-size: 20px;
}

.footer__nav {
    display: flex;
    gap: 32px;
}

.footer__nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    transition: color var(--transition);
}

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

.footer__copy {
    border-top: 1px solid var(--border);
    padding-top: 20px;
    color: var(--text-muted);
    font-size: 14px;
}

/* ===== АДАПТИВ ===== */
@media (max-width: 992px) {
    .hero__inner {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }

    .hero__subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .visual-grid {
        font-size: 34px;
        padding: 24px;
        gap: 12px;
    }

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

@media (max-width: 768px) {
    .nav {
        display: none;
        flex-direction: column;
        gap: 16px;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        padding: 24px;
        border-bottom: 1px solid var(--border);
        backdrop-filter: blur(18px);
    }

    .nav.open {
        display: flex;
    }

    .burger {
        display: flex;
    }

    .hero__title {
        font-size: 34px;
    }

    .section__title {
        font-size: 28px;
    }

    .tabs__nav {
        flex-direction: column;
    }

    .tabs__btn {
        border-bottom: none;
        border-left: 3px solid transparent;
        text-align: left;
        padding: 14px 20px;
    }

    .tabs__btn.active {
        border-left-color: var(--accent);
        border-bottom: none;
    }

    .tabs__content {
        padding: 20px;
    }

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

    .footer__nav {
        flex-wrap: wrap;
        gap: 16px;
    }

    .accordion__header {
        font-size: 16px;
        padding: 16px 18px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 48px 0;
    }

    .hero__title {
        font-size: 28px;
    }

    .visual-grid {
        font-size: 26px;
        padding: 16px;
        gap: 8px;
    }

    .btn {
        padding: 12px 28px;
        font-size: 15px;
    }
}