/*
 * ATWIN — base: reset, типографика, каркас страницы, утилиты, доступность.
 */

/* ── Reset ────────────────────────────────────────────────── */
*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
}

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
    background-color: var(--c-bg);
    scrollbar-color: var(--c-plum-light) transparent;
}

body {
    min-height: 100vh;
    min-height: 100dvh;
    font-family: var(--font-body);
    font-size: var(--fs-body);
    font-weight: 400;
    line-height: var(--lh-normal);
    color: var(--c-text);
    background-color: var(--c-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
    overflow-x: clip;
}

/* Мягкий градиентный фон-меш (фиксированный, вне потока). */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
    background:
        radial-gradient(1200px 700px at 15% -10%, rgba(147, 86, 168, 0.18), transparent 60%),
        radial-gradient(1000px 640px at 100% 0%, rgba(42, 35, 115, 0.5), transparent 55%),
        radial-gradient(900px 620px at 82% 112%, rgba(220, 113, 31, 0.12), transparent 60%),
        var(--c-bg);
}

img,
svg,
video,
canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

button,
input,
select,
textarea {
    font: inherit;
    color: inherit;
}

button {
    cursor: pointer;
}

a {
    color: var(--c-accent-hi);
    text-decoration: none;
    transition: color var(--dur-2) var(--ease-out);
}

a:hover {
    color: var(--c-accent);
}

::selection {
    background: var(--c-accent);
    color: var(--c-on-accent);
}

/* ── Типографика ──────────────────────────────────────────── */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: var(--track-tight);
    line-height: var(--lh-snug);
    text-wrap: balance;
}

h1 { font-size: var(--fs-h1); line-height: var(--lh-tight); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); }

p {
    text-wrap: pretty;
}

strong,
b {
    font-weight: 700;
}

/* ── Доступность ──────────────────────────────────────────── */
:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
    border-radius: var(--r-xs);
}

.skip-link {
    position: absolute;
    left: var(--sp-4);
    top: var(--sp-4);
    z-index: var(--z-toast);
    padding: 0.7rem 1.1rem;
    border-radius: var(--r-pill);
    background: var(--c-accent);
    color: var(--c-on-accent);
    font-weight: 700;
    transform: translateY(-200%);
    transition: transform var(--dur-2) var(--ease-out);
}

.skip-link:focus-visible {
    transform: translateY(0);
}

.visually-hidden {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

/* ── Каркас ───────────────────────────────────────────────── */
.container {
    width: calc(100% - 2 * var(--gutter));
    max-width: var(--container);
    margin-inline: auto;
}

.container--wide {
    max-width: var(--container-wide);
}

main {
    display: block;
}

.section {
    position: relative;
    padding-block: clamp(3.5rem, 8vw, 7rem);
    scroll-margin-top: calc(var(--header-h) + 16px);
}

.section--alt {
    background: linear-gradient(180deg, transparent, rgba(26, 20, 64, 0.55) 22%, rgba(26, 20, 64, 0.55) 78%, transparent);
}

.section--flush {
    padding-block: 0;
}

.section__head {
    max-width: 760px;
    margin-inline: auto;
    text-align: center;
}

.section__head--start {
    margin-inline: 0;
    text-align: left;
}

.section-title {
    font-size: var(--fs-h2);
    margin-top: var(--sp-3);
}

.section-lead {
    margin-top: var(--sp-3);
    color: var(--c-muted);
    font-size: var(--fs-lead);
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: 0.4rem 0.9rem;
    border: 1px solid var(--c-border-strong);
    border-radius: var(--r-pill);
    background: rgba(255, 255, 255, 0.03);
    color: var(--c-muted);
    font-family: var(--font-body);
    font-size: var(--fs-xs);
    font-weight: 600;
    letter-spacing: var(--track-wide);
    text-transform: uppercase;
}

.eyebrow::before {
    content: '';
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--c-accent);
    box-shadow: 0 0 10px var(--c-accent);
}

.gradient-text {
    background: var(--grad-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

/* ── Утилиты ──────────────────────────────────────────────── */
.text-muted { color: var(--c-muted) !important; }
.text-center { text-align: center; }
.is-hidden { display: none !important; }

.list-bare {
    list-style: none;
    padding: 0;
}

.mx-auto { margin-inline: auto; }

.round { border-radius: var(--r-md); }
.round-lg { border-radius: var(--r-lg); }

/* Стек: вертикальный ритм без ручных margin. */
.stack > * + * { margin-top: var(--sp-4); }
.stack-lg > * + * { margin-top: var(--sp-6); }

/* Хлебные крошки/маркер «живой» ссылки для анимированного подчёркивания. */
.link-underline {
    position: relative;
}

.link-underline::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 100%;
    height: 1px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--dur-2) var(--ease-out);
}

.link-underline:hover::after,
.link-underline:focus-visible::after {
    transform: scaleX(1);
}

/* ── Скроллбар (WebKit) ───────────────────────────────────── */
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: rgba(147, 86, 168, 0.7);
    border: 3px solid var(--c-bg);
    border-radius: var(--r-pill);
}

@supports (color: color-mix(in srgb, red, blue)) {
    ::-webkit-scrollbar-thumb {
        background: color-mix(in srgb, var(--c-plum-light) 70%, transparent);
    }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}

@media (prefers-contrast: more) {
    a { text-decoration: underline; }
}