/* ============================================================
   ZenVault VPN — Dark Theme Stylesheet
   ============================================================ */

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

:root {
    --bg:        #0b0d11;
    --bg-alt:    #12151c;
    --surface:   #1a1e28;
    --border:    #262b38;
    --text:      #e0e4ec;
    --text-dim:  #8a91a4;
    --primary:   #22c55e;
    --primary-h: #16a34a;
    --accent:    #22c55e;
    --danger:    #ff5c5c;
    --success:   #22c55e;
    --radius:    10px;
    --radius-sm: 6px;
    --max-w:     1140px;
    --nav-h:     64px;
    --font:      -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

    /* --- Carousel phone sizing (главное) --- */
    --phone-w-desktop: 380px;   /* “телефонный” размер на ПК */
    --phone-w-tablet:  340px;   /* планшет */
    --phone-w-mobile:  300px;   /* телефон */
    --phone-aspect:    9 / 19.5;/* портретный экран */
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary-h); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }

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

/* --- Layout --- */
.container { width: 100%; max-width: var(--max-w); margin: 0 auto; padding: 0 1.25rem; }

/* --- Navbar --- */
.navbar {
    position: sticky; top: 0; z-index: 100;
    background: rgba(11,13,17,.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    height: var(--nav-h);
}
.navbar__inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 100%;
}
.navbar__brand {
    display: flex; align-items: center; gap: .5rem;
    font-weight: 700; font-size: 1.15rem; color: var(--text);
}
.navbar__brand:hover { color: var(--primary-h); }
.navbar__nav {
    display: flex; align-items: center; gap: 1.5rem;
}
.navbar__nav a { color: var(--text-dim); font-size: .95rem; font-weight: 500; }
.navbar__nav a:hover { color: var(--text); }
.navbar__toggle {
    display: none; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 4px;
}
.navbar__toggle span {
    display: block; width: 22px; height: 2px; background: var(--text);
    border-radius: 2px; transition: .3s;
}

/* --- Buttons --- */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: .6rem 1.4rem; border-radius: var(--radius-sm);
    font-weight: 600; font-size: .95rem; border: none; cursor: pointer;
    transition: background .2s, transform .15s, box-shadow .2s;
    text-decoration: none;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--primary); color: #fff; }
.btn--primary:hover { background: var(--primary-h); color: #fff; box-shadow: 0 4px 20px rgba(34,197,94,.35); }
.btn--outline { background: transparent; color: var(--primary-h); border: 1.5px solid var(--primary); }
.btn--outline:hover { background: var(--primary); color: #fff; }
.btn--sm { padding: .4rem 1rem; font-size: .85rem; }
.btn--lg { padding: .75rem 2rem; font-size: 1.05rem; }
.btn--block { width: 100%; }

/* --- Hero --- */
.hero {
    padding: 6rem 0 4rem;
    text-align: center;
}
.hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.6rem);
    line-height: 1.15;
    font-weight: 800;
    margin-bottom: 1.25rem;
}
.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero__sub {
    font-size: 1.15rem; color: var(--text-dim);
    max-width: 620px; margin: 0 auto 2rem;
}
.hero__cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* --- Sections --- */
.section { padding: 4rem 0; }
.section--alt { background: var(--bg-alt); }
.section__title {
    text-align: center; font-size: 1.75rem; font-weight: 700;
    margin-bottom: 2.5rem;
}

.page-header {
    padding: 3.5rem 0 2rem; text-align: center;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
}
.page-header h1 { font-size: 2rem; font-weight: 700; margin-bottom: .5rem; }
.page-header p { color: var(--text-dim); font-size: 1.05rem; }

/* --- Grid --- */
.grid { display: grid; gap: 1.5rem; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* --- Card --- */
.card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 2rem;
    transition: border-color .25s, transform .2s;
}
.card:hover { border-color: var(--primary); transform: translateY(-3px); }
.card__icon { margin-bottom: 1rem; }
.card h3 { font-size: 1.15rem; margin-bottom: .5rem; }
.card p { color: var(--text-dim); font-size: .95rem; }

/* --- Stats --- */
.stat { text-align: center; padding: 1.5rem; }
.stat__number {
    display: block; font-size: 2.5rem; font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat__label { color: var(--text-dim); font-size: .95rem; }

/* --- CTA Block --- */
.cta-block { text-align: center; }
.cta-block h2 { font-size: 1.75rem; margin-bottom: .5rem; }
.cta-block p { color: var(--text-dim); margin-bottom: 1.5rem; }

/* --- Pricing Cards --- */
.price-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 2rem;
    display: flex; flex-direction: column; position: relative;
    transition: border-color .25s, transform .2s;
}
.price-card:hover { transform: translateY(-3px); }
.price-card--popular {
    border-color: var(--primary);
    box-shadow: 0 0 30px rgba(34,197,94,.15);
}
.price-card__badge {
    position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
    background: var(--primary); color: #fff; font-size: .75rem; font-weight: 700;
    padding: .25rem .75rem; border-radius: 20px; text-transform: uppercase;
    letter-spacing: .04em;
}
.price-card h3 { font-size: 1.1rem; margin-bottom: .75rem; color: var(--text-dim); }
.price-card__price { margin-bottom: .5rem; }
.price-card__amount { font-size: 2.5rem; font-weight: 800; }
.price-card__period { font-size: .95rem; color: var(--text-dim); }
.price-card__billed { font-size: .85rem; color: var(--text-dim); margin-bottom: 1rem; }
.price-card__features {
    list-style: none; flex: 1; margin-bottom: 1.5rem;
}
.price-card__features li {
    padding: .4rem 0; border-bottom: 1px solid var(--border);
    font-size: .9rem; color: var(--text-dim);
}
.price-card__features li::before {
    content: "\2713"; color: var(--accent); margin-right: .5rem; font-weight: 700;
}

/* --- Feature blocks --- */
.feature-block {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 2rem;
}
.feature-block h3 { font-size: 1.1rem; margin-bottom: .5rem; }
.feature-block p { color: var(--text-dim); font-size: .9rem; }
.feature-mini { text-align: center; }
.feature-mini strong { display: block; margin-bottom: .25rem; font-size: 1rem; }
.feature-mini p { color: var(--text-dim); font-size: .9rem; }

/* --- Download cards --- */
.dl-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 2rem; text-align: center;
    transition: border-color .25s;
}
.dl-card:hover { border-color: var(--primary); }
.dl-card__icon { margin: 0 auto 1rem; }
.dl-card h3 { margin-bottom: .25rem; }
.dl-card p { color: var(--text-dim); font-size: .9rem; margin-bottom: 1.25rem; }

/* --- Contact --- */
.contact-layout {
    display: grid; grid-template-columns: 1fr 1.4fr; gap: 3rem;
    align-items: start;
}
.contact-info h3 { font-size: 1.25rem; margin-bottom: 1rem; }
.contact-list { list-style: none; }
.contact-list li { margin-bottom: 1.25rem; }
.contact-list strong { display: block; font-size: .85rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: .04em; margin-bottom: .15rem; }

/* --- Forms --- */
.form { display: flex; flex-direction: column; gap: 1.25rem; }
.form__group { display: flex; flex-direction: column; gap: .35rem; }
.form__group label { font-size: .9rem; font-weight: 600; }
.form__group input,
.form__group textarea {
    background: var(--bg); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: .7rem .9rem;
    color: var(--text); font-size: .95rem; font-family: var(--font);
    transition: border-color .2s;
}
.form__group input:focus,
.form__group textarea:focus {
    outline: none; border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(34,197,94,.15);
}
.form__group--error input,
.form__group--error textarea { border-color: var(--danger); }
.form__error { color: var(--danger); font-size: .85rem; }

/* --- Alerts --- */
.alert {
    padding: 1rem 1.25rem; border-radius: var(--radius-sm);
    margin-bottom: 1.5rem; font-size: .95rem;
}
.alert--success { background: rgba(46,204,113,.12); border: 1px solid var(--success); color: var(--success); }
.alert--error { background: rgba(255,92,92,.1); border: 1px solid var(--danger); color: var(--danger); }

/* --- Legal Content --- */
.legal-content { max-width: 800px; }
.legal-content h2 { font-size: 1.3rem; margin: 2rem 0 .75rem; }
.legal-content h3 { font-size: 1.1rem; margin: 1.5rem 0 .5rem; }
.legal-content p, .legal-content li { color: var(--text-dim); font-size: .95rem; }
.legal-content ul, .legal-content ol { padding-left: 1.5rem; margin: .75rem 0; }
.legal-content li { margin-bottom: .4rem; }
.legal-content address {
    font-style: normal; background: var(--surface); padding: 1rem 1.25rem;
    border-radius: var(--radius-sm); margin: 1rem 0; border: 1px solid var(--border);
    color: var(--text-dim); line-height: 1.7;
}
.legal-table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
.legal-table td {
    padding: .65rem .75rem; border-bottom: 1px solid var(--border);
    font-size: .95rem; color: var(--text-dim);
}
.legal-table td:first-child { width: 200px; }

/* --- Footer --- */
.footer {
    background: var(--bg-alt); border-top: 1px solid var(--border);
    padding: 3rem 0 1.5rem;
}
.footer__inner {
    display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 2rem;
}
.footer__col h4 { font-size: .95rem; margin-bottom: .75rem; }
.footer__tagline { color: var(--text-dim); font-size: .9rem; margin-bottom: .5rem; }
.footer__company { color: var(--text-dim); font-size: .8rem; }
.footer__col ul { list-style: none; }
.footer__col li { margin-bottom: .4rem; }
.footer__col a { color: var(--text-dim); font-size: .9rem; }
.footer__col a:hover { color: var(--text); }
.footer__bottom {
    text-align: center; padding-top: 1.5rem; margin-top: 2rem;
    border-top: 1px solid var(--border);
}
.footer__bottom p { color: var(--text-dim); font-size: .85rem; }

/* --- Preview (App Preview two-column) --- */
.preview {
    display: grid;
    grid-template-columns: 1fr 1.6fr;
    gap: 3rem;
    align-items: center;
}
.preview__heading {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: .5rem;
}
.preview__sub {
    color: var(--text-dim);
    font-size: 1.05rem;
    margin-bottom: 1.5rem;
}
.preview__bullets {
    list-style: none;
    margin-bottom: 2rem;
}
.preview__bullets li {
    padding: .45rem 0;
    font-size: 1rem;
    color: var(--text-dim);
}
.preview__bullets li::before {
    content: "\2713";
    color: var(--primary);
    font-weight: 700;
    margin-right: .6rem;
}
.preview__slider {
    min-width: 0;
    display: flex;
    justify-content: center; /* центрируем “телефон” */
}

/* --- Carousel (inside preview__slider) --- */
.carousel {
    position: relative;
    user-select: none;
    -webkit-user-select: none;

    /* фиксируем “телефонный” размер, чтобы не разъезжалось */
    width: min(100%, var(--phone-w-desktop));
}
.carousel__track {
    overflow: hidden;
    position: relative;

    /* padding-hack для Safari: aspect-ratio не пробрасывает height:100% детям */
    width: 100%;
    height: 0;
    padding-bottom: calc(100% * 19.5 / 9);

    border-radius: 22px;
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: 0 18px 55px rgba(0,0,0,.45);
}
.carousel__slides {
    display: flex;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    -webkit-transition: -webkit-transform .45s ease;
    transition: transform .45s ease;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}
.carousel__slide {
    min-width: 100%;
    flex: 0 0 100%;
    height: 100%;
    overflow: hidden;
    padding: 0;
}
.carousel__slide img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 20px;
}

/* Arrows */
.carousel__arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);

    background: rgba(0,0,0,.55);
    border: 1px solid rgba(255,255,255,.15);
    color: #fff;

    width: 40px;
    height: 40px;
    border-radius: 50%;

    display: flex;
    align-items: center;
    justify-content: center;

    cursor: pointer;
    font-size: 1.15rem;
    transition: background .2s, border-color .2s;
    z-index: 2;
    line-height: 1;
}
.carousel__arrow:hover {
    background: var(--primary);
    border-color: var(--primary);
}

/* стрелки рядом с “телефоном”, но не ломают верстку */
.carousel__arrow--prev { left: -52px; }
.carousel__arrow--next { right: -52px; }

/* Dots */
.carousel__dots {
    display: flex;
    justify-content: center;
    gap: .5rem;
    margin-top: 1rem;
}
.carousel__dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: none;
    background: var(--border);
    cursor: pointer;
    transition: background .2s, transform .2s;
    padding: 0;
}
.carousel__dot--active {
    background: var(--primary);
    transform: scale(1.25);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px) {
    .grid--3 { grid-template-columns: 1fr 1fr; }
    .grid--4 { grid-template-columns: 1fr 1fr; }
    .footer__inner { grid-template-columns: 1fr 1fr; }
    .contact-layout { grid-template-columns: 1fr; }

    /* preview: на планшете делаем аккуратнее */
    .preview {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    .preview__slider { justify-content: center; }

    .carousel { width: min(100%, var(--phone-w-tablet)); }
    .carousel__arrow--prev { left: -46px; }
    .carousel__arrow--next { right: -46px; }
}

@media (max-width: 640px) {
    .grid--2,
    .grid--3,
    .grid--4 { grid-template-columns: 1fr; }

    .footer__inner { grid-template-columns: 1fr; gap: 1.5rem; }

    /* Mobile nav */
    .navbar__toggle { display: flex; }
    .navbar__nav {
        display: none;
        position: absolute; top: var(--nav-h); left: 0; right: 0;
        background: var(--bg); border-bottom: 1px solid var(--border);
        flex-direction: column; padding: 1rem 1.25rem; gap: .75rem;
    }
    .navbar__nav.active { display: flex; }

    .hero { padding: 4rem 0 3rem; }
    .hero h1 { font-size: 2rem; }
    .hero__sub { font-size: 1rem; }

    /* mobile: “телефон” меньше и стрелки внутрь, чтобы не разъезжалось */
    .carousel { width: min(100%, var(--phone-w-mobile)); }

    .carousel__arrow {
        width: 36px; height: 36px; font-size: 1rem;
        background: rgba(0,0,0,.45);
    }
    .carousel__arrow--prev { left: 10px; }
    .carousel__arrow--next { right: 10px; }
}