/* =============================================================================
   АйСтория — базовые стили (BEM, mobile-first)
   Палитра «Midnight Aurora» — ночной синий + фиолет/бирюза/роза + золото.
   ========================================================================== */

:root {
    /* База (ночное небо) */
    --c-night-0:      #07091E;
    --c-night:        #0B1230;
    --c-night-2:      #0F1E3D;
    --c-night-3:      #15214B;

    /* Глубокие индиго для карточек */
    --c-card:         #181C42;
    --c-card-2:       #1F2455;
    --c-card-hi:      #262C66;

    /* Аврора-акценты */
    --c-violet:       #A864F8;
    --c-violet-2:     #7B3FD6;
    --c-teal:         #5CC8E6;
    --c-rose:         #FF6BC1;

    --c-gold:         #F4C36B;
    --c-gold-soft:    #FBD89A;
    --c-cream:        #F5EFE0;
    --c-cream-soft:   #FAF3E3;
    --c-peach:        #E8A584;

    /* Текст — повышенный контраст */
    --c-text:         #F5EFE0;
    --c-text-dim:     rgba(245, 239, 224, 0.92);
    --c-text-soft:    rgba(245, 239, 224, 0.78);
    --c-text-muted:   rgba(245, 239, 224, 0.56);
    --c-border:       rgba(245, 239, 224, 0.10);
    --c-border-soft:  rgba(245, 239, 224, 0.06);

    /* Типографика */
    --font-display: 'Onest', 'Manrope', 'Inter', 'Segoe UI', system-ui, sans-serif;
    --font-sans:    'Manrope', 'Inter', 'Segoe UI', system-ui, sans-serif;

    /* Радиусы */
    --r-sm: 10px;
    --r-md: 16px;
    --r-lg: 22px;
    --r-xl: 32px;

    /* Тени */
    --sh-card:        0 12px 40px rgba(0, 0, 0, 0.4);
    --sh-card-hi:     0 22px 60px rgba(0, 0, 0, 0.5);
    --sh-violet:      0 16px 50px rgba(168, 100, 248, 0.35);
    --sh-rose:        0 16px 50px rgba(255, 107, 193, 0.30);
    --sh-teal:        0 14px 50px rgba(92, 200, 230, 0.25);
    --sh-gold:        0 10px 40px rgba(244, 195, 107, 0.30);

    /* Скорости */
    --t-fast: 160ms;
    --t-base: 260ms;
    --t-slow: 460ms;
    --ease:   cubic-bezier(.2, .8, .2, 1);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--c-text);
    background: var(--c-night-0);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    position: relative;
}

img, svg, video { max-width: 100%; height: auto; display: block; }
button { font: inherit; cursor: pointer; background: none; border: 0; color: inherit; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
p { margin: 0; }
h1, h2, h3, h4 {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

/* --- Aurora background (фиксированный фон под всем сайтом) --- */
.aurora-bg {
    position: fixed;
    inset: 0;
    z-index: -10;
    pointer-events: none;
    overflow: hidden;
    background:
        radial-gradient(1200px 700px at 80% -10%, rgba(168, 100, 248, 0.18), transparent 70%),
        radial-gradient(900px 700px at -10% 30%, rgba(92, 200, 230, 0.10), transparent 65%),
        linear-gradient(180deg, #07091E 0%, #0B1230 40%, #15214B 100%);
}
.aurora-bg__layer {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.55;
    mix-blend-mode: screen;
    animation: aurora-float 16s var(--ease) infinite alternate;
}
.aurora-bg__layer--violet {
    width: 60vw; height: 60vw;
    top: 5%; right: -15%;
    background: radial-gradient(circle, rgba(168, 100, 248, 0.6), rgba(168, 100, 248, 0) 60%);
}
.aurora-bg__layer--teal {
    width: 55vw; height: 55vw;
    bottom: 10%; left: -20%;
    background: radial-gradient(circle, rgba(92, 200, 230, 0.4), rgba(92, 200, 230, 0) 65%);
    animation-delay: -8s;
    animation-duration: 20s;
}
.aurora-bg__layer--rose {
    width: 40vw; height: 40vw;
    top: 50%; right: 30%;
    background: radial-gradient(circle, rgba(255, 107, 193, 0.28), rgba(255, 107, 193, 0) 65%);
    animation-delay: -4s;
    animation-duration: 22s;
    opacity: 0.45;
}

@keyframes aurora-float {
    0%   { transform: translate3d(0, 0, 0) scale(1); }
    50%  { transform: translate3d(-4%, 6%, 0) scale(1.08); }
    100% { transform: translate3d(5%, -3%, 0) scale(0.95); }
}

/* Звёзды (3 слоя; parallax двигает их в JS) */
.aurora-bg__stars {
    position: absolute;
    inset: -20vh 0 -20vh 0;
    width: 100%;
    will-change: transform;
}
.aurora-bg__stars::before,
.aurora-bg__stars::after {
    content: '';
    position: absolute;
    inset: 0;
    background-repeat: repeat;
}
.aurora-bg__stars--far::before {
    background-image:
        radial-gradient(1px 1px at 10% 10%, rgba(245,239,224,0.8) 100%, transparent),
        radial-gradient(1px 1px at 40% 30%, rgba(245,239,224,0.7) 100%, transparent),
        radial-gradient(1px 1px at 70% 15%, rgba(245,239,224,0.6) 100%, transparent),
        radial-gradient(1px 1px at 85% 50%, rgba(245,239,224,0.75) 100%, transparent),
        radial-gradient(1px 1px at 20% 70%, rgba(245,239,224,0.65) 100%, transparent),
        radial-gradient(1px 1px at 55% 85%, rgba(245,239,224,0.7) 100%, transparent),
        radial-gradient(1px 1px at 92% 80%, rgba(245,239,224,0.6) 100%, transparent),
        radial-gradient(1px 1px at 35% 50%, rgba(245,239,224,0.55) 100%, transparent),
        radial-gradient(1px 1px at 78% 35%, rgba(245,239,224,0.7) 100%, transparent),
        radial-gradient(1px 1px at 5% 45%, rgba(245,239,224,0.6) 100%, transparent);
    background-size: 100% 100%;
}
.aurora-bg__stars--mid::before {
    background-image:
        radial-gradient(1.4px 1.4px at 25% 20%, rgba(245,239,224,0.95) 100%, transparent),
        radial-gradient(1.4px 1.4px at 65% 40%, rgba(244,195,107,0.85) 100%, transparent),
        radial-gradient(1.4px 1.4px at 88% 65%, rgba(245,239,224,0.9) 100%, transparent),
        radial-gradient(1.4px 1.4px at 12% 60%, rgba(168,100,248,0.7) 100%, transparent),
        radial-gradient(1.4px 1.4px at 48% 75%, rgba(245,239,224,0.85) 100%, transparent),
        radial-gradient(1.4px 1.4px at 92% 25%, rgba(244,195,107,0.7) 100%, transparent),
        radial-gradient(1.4px 1.4px at 38% 10%, rgba(245,239,224,0.9) 100%, transparent);
    background-size: 100% 100%;
    animation: twinkle-mid 6s ease-in-out infinite alternate;
}
.aurora-bg__stars--near::before {
    background-image:
        radial-gradient(2px 2px at 15% 35%, rgba(244,195,107,0.95) 100%, transparent),
        radial-gradient(2px 2px at 50% 22%, rgba(245,239,224,1) 100%, transparent),
        radial-gradient(2.2px 2.2px at 82% 70%, rgba(168,100,248,0.85) 100%, transparent),
        radial-gradient(2px 2px at 28% 88%, rgba(92,200,230,0.85) 100%, transparent),
        radial-gradient(2.4px 2.4px at 70% 12%, rgba(244,195,107,0.9) 100%, transparent);
    background-size: 100% 100%;
    animation: twinkle-near 4.5s ease-in-out infinite alternate;
}
@keyframes twinkle-mid {
    0%, 100% { opacity: 0.85; }
    50%      { opacity: 0.55; }
}
@keyframes twinkle-near {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.6; }
}

/* --- Контейнеры --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin-inline: auto;
    padding-inline: 20px;
    position: relative;
    z-index: 1;
}
.container--narrow { max-width: 820px; }

@media (min-width: 768px) {
    .container { padding-inline: 32px; }
}

/* --- Page wrapper --- */
.page__main { display: block; position: relative; z-index: 1; }

/* --- Section head --- */
.section-head {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 36px;
    max-width: 760px;
}
.section-head--center { margin-inline: auto; text-align: center; align-items: center; }
.section-head__eyebrow {
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.22em;
    font-size: 12px;
    color: var(--c-gold);
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}
.section-head__eyebrow::before {
    content: '';
    width: 22px; height: 1px;
    background: var(--c-gold);
    opacity: 0.6;
}
.section-head--center .section-head__eyebrow::after {
    content: '';
    width: 22px; height: 1px;
    background: var(--c-gold);
    opacity: 0.6;
}
.section-head__title {
    font-size: clamp(30px, 4.6vw, 52px);
    line-height: 1.08;
    font-weight: 800;
}
.section-head__lead {
    font-size: clamp(15px, 1.6vw, 19px);
    color: var(--c-text-dim);
    line-height: 1.55;
}
@media (min-width: 768px) {
    .section-head { margin-bottom: 56px; }
}

/* --- Buttons --- */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border: 1px solid transparent;
    border-radius: 999px;
    padding: 14px 26px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 15px;
    line-height: 1;
    transition:
        transform var(--t-base) var(--ease),
        background var(--t-base) var(--ease),
        box-shadow var(--t-base) var(--ease),
        border-color var(--t-base) var(--ease),
        color var(--t-base) var(--ease);
    text-decoration: none;
    user-select: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    isolation: isolate;
    letter-spacing: -0.01em;
}
.button:active { transform: translateY(1px) scale(0.99); }

.button--primary {
    background: linear-gradient(135deg, #A864F8 0%, #FF6BC1 60%, #F4C36B 130%);
    color: #100920;
    box-shadow: var(--sh-violet);
}
.button--primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.0) 0%, rgba(255,255,255,0.4) 50%, rgba(255,255,255,0.0) 100%);
    transform: translateX(-120%);
    transition: transform 0.9s var(--ease);
    z-index: -1;
}
.button--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 22px 70px rgba(168, 100, 248, 0.55), 0 0 80px rgba(255, 107, 193, 0.25);
}
.button--primary:hover::before { transform: translateX(120%); }

.button--ghost {
    background: rgba(245, 239, 224, 0.06);
    color: var(--c-text);
    border-color: rgba(245, 239, 224, 0.20);
    backdrop-filter: blur(10px);
}
.button--ghost:hover {
    background: rgba(168, 100, 248, 0.14);
    border-color: rgba(168, 100, 248, 0.55);
    transform: translateY(-2px);
}

.button--lg { padding: 16px 30px; font-size: 16px; }
.button--xl { padding: 20px 38px; font-size: 17px; }

.button__arrow { transition: transform var(--t-base) var(--ease); }
.button:hover .button__arrow { transform: translateX(4px); }

/* --- Site header --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(16px);
    background: rgba(7, 9, 30, 0.72);
    border-bottom: 1px solid var(--c-border-soft);
    transition: background var(--t-base) var(--ease), border-color var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}
.site-header--scrolled {
    background: rgba(7, 9, 30, 0.92);
    border-bottom-color: rgba(168, 100, 248, 0.18);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}
.site-header__container {
    max-width: 1280px;
    margin-inline: auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    gap: 24px;
}
.site-header__brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--c-text);
}
.site-header__logo { display: inline-flex; }
.site-header__title { display: flex; flex-direction: column; line-height: 1; gap: 3px; }
.site-header__name {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 19px;
    letter-spacing: -0.02em;
}
.site-header__tagline {
    font-size: 10.5px;
    color: var(--c-text-muted);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    font-weight: 600;
}

.site-header__nav {
    display: none;
    gap: 28px;
    margin-inline-start: 24px;
}
.site-header__link {
    color: var(--c-text-dim);
    font-size: 14.5px;
    font-weight: 500;
    transition: color var(--t-base) var(--ease);
    position: relative;
}
.site-header__link::after {
    content: '';
    position: absolute;
    bottom: -6px; left: 0;
    width: 0; height: 2px;
    background: linear-gradient(90deg, var(--c-violet), var(--c-rose));
    border-radius: 2px;
    transition: width var(--t-base) var(--ease);
}
.site-header__link:hover { color: var(--c-text); }
.site-header__link:hover::after { width: 100%; }
.site-header__link--ghost { display: none; }

.site-header__actions {
    margin-inline-start: auto;
    display: flex;
    align-items: center;
    gap: 12px;
}
.site-header__cta { display: none; }

.site-header__burger {
    width: 42px; height: 42px;
    background: rgba(245, 239, 224, 0.06);
    border: 1px solid rgba(245, 239, 224, 0.14);
    border-radius: 12px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 0;
}
.site-header__burger span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--c-cream);
    border-radius: 2px;
    transition: transform var(--t-base) var(--ease), opacity var(--t-base) var(--ease);
}
.site-header__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.site-header__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.site-header__mobile {
    border-top: 1px solid var(--c-border-soft);
    padding: 18px 20px 24px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    background: rgba(7, 9, 30, 0.96);
}
.site-header__mobile[hidden] { display: none; }
.site-header__mobile-link {
    color: var(--c-text-dim);
    font-size: 16px;
    padding: 8px 0;
    font-weight: 500;
}
.site-header__mobile-cta { align-self: flex-start; margin-top: 6px; }

@media (min-width: 900px) {
    .site-header__nav { display: inline-flex; }
    .site-header__link--ghost { display: inline-flex; }
    .site-header__cta { display: inline-flex; }
    .site-header__burger { display: none; }
    .site-header__mobile { display: none !important; }
}

/* --- Site footer --- */
.site-footer {
    margin-top: 100px;
    border-top: 1px solid var(--c-border-soft);
    background: linear-gradient(180deg, rgba(7, 9, 30, 0) 0%, rgba(0, 0, 0, 0.35) 100%);
    position: relative;
    z-index: 1;
}
.site-footer__container {
    max-width: 1200px;
    margin-inline: auto;
    padding: 64px 20px 32px;
}
.site-footer__top {
    display: flex;
    flex-direction: column;
    gap: 40px;
    margin-bottom: 40px;
}
.site-footer__brand { display: flex; gap: 16px; align-items: flex-start; max-width: 380px; }
.site-footer__name {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 22px;
    margin-bottom: 6px;
    letter-spacing: -0.02em;
}
.site-footer__about { color: var(--c-text-dim); font-size: 14.5px; line-height: 1.6; }

.site-footer__nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}
.site-footer__col { display: flex; flex-direction: column; gap: 10px; }
.site-footer__col-title {
    color: var(--c-gold);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 11px;
    font-weight: 700;
    margin-bottom: 4px;
    font-family: var(--font-display);
}
.site-footer__link {
    color: var(--c-text-dim);
    font-size: 14.5px;
    transition: color var(--t-base) var(--ease);
}
.site-footer__link:hover { color: var(--c-text); }

.site-footer__bottom {
    border-top: 1px solid var(--c-border-soft);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    color: var(--c-text-muted);
    font-size: 13px;
}

@media (min-width: 768px) {
    .site-footer__top { flex-direction: row; gap: 80px; }
    .site-footer__nav { grid-template-columns: repeat(4, 1fr); gap: 32px; flex: 1; }
}

/* --- Focus --- */
:focus-visible {
    outline: 2px solid var(--c-violet);
    outline-offset: 3px;
    border-radius: 8px;
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
    .aurora-bg__layer { animation: none !important; }
    .aurora-bg__stars { animation: none !important; }
}