/* === BASE.CSS === */
/* assets/css/base.css */
/* НАЗНАЧЕНИЕ: Reset, типографика, layout grid, утилиты */
/* РАЗМЕР: ~350 строк */

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    background-image: var(--gradient-mesh);
    background-attachment: fixed;
    line-height: var(--line-height-body);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

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

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

ul, ol {
    list-style: none;
}

/* --- Типографика --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: var(--line-height-heading);
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

h1 { font-size: var(--font-size-h1); margin-bottom: var(--gap-lg); }
h2 { font-size: var(--font-size-h2); margin-bottom: var(--gap-md); }
h3 { font-size: var(--font-size-h3); margin-bottom: var(--gap-sm); }

p {
    margin-bottom: var(--gap-md);
    color: var(--text-secondary);
}

.lead {
    font-size: var(--font-size-lead);
    color: var(--text-secondary);
    line-height: 1.8;
}

.text-accent { color: var(--color-accent); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* --- Layout --- */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--container-padding);
}

.container-narrow {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--container-padding);
}

.section {
    padding: var(--section-padding);
    position: relative;
}

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

/* --- Grid --- */
.grid {
    display: grid;
    gap: var(--gap-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* --- Flex --- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-center { align-items: center; justify-content: center; }
.flex-between { justify-content: space-between; align-items: center; }
.flex-wrap { flex-wrap: wrap; }
.flex-gap-sm { gap: var(--gap-sm); }
.flex-gap-md { gap: var(--gap-md); }
.flex-gap-lg { gap: var(--gap-lg); }

/* --- Spacing utilities --- */
.mt-sm { margin-top: var(--gap-sm); }
.mt-md { margin-top: var(--gap-md); }
.mt-lg { margin-top: var(--gap-lg); }
.mt-xl { margin-top: var(--gap-xl); }
.mt-2xl { margin-top: var(--gap-2xl); }
.mb-sm { margin-bottom: var(--gap-sm); }
.mb-md { margin-bottom: var(--gap-md); }
.mb-lg { margin-bottom: var(--gap-lg); }
.mb-xl { margin-bottom: var(--gap-xl); }
.pt-lg { padding-top: var(--gap-lg); }
.pb-lg { padding-bottom: var(--gap-lg); }

/* --- Видимость --- */
.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

/* --- Разделители --- */
.divider {
    height: 1px;
    background: var(--border-color);
    margin: var(--gap-xl) 0;
    border: none;
}

/* --- Scroll reveal --- */
/* Only hide elements when JS is ready (body.js-ready) */
body.js-ready .reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

body.js-ready .reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Without JS — everything visible */
.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered delays */
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* --- Loading state --- */
.page-loading {
    opacity: 0.5;
    pointer-events: none;
    transition: opacity var(--transition-fast);
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--border-radius);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* --- Selection --- */
::selection {
    background: var(--color-accent);
    color: var(--bg-primary);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }

    .section {
        padding: clamp(40px, 6vw, 60px) 0;
    }

    .hide-mobile { display: none !important; }
}

@media (max-width: 480px) {
    :root {
        --font-size-base: 15px;
    }
}