/* ══════════════════════════════════════════════
   style-modern.css  –  russki-mat.net  (dark mode)
   ══════════════════════════════════════════════ */

/* ── Custom Properties (Dark Theme) ────────── */
:root {
    /* Brand */
    --color-brand:        #e05a30;
    --color-brand-hover:  #ff7448;
    --color-brand-dim:    #8b2800;

    /* Surface palette */
    --color-bg:           #0e0e0e;
    --color-surface:      #181818;
    --color-surface-2:    #222222;
    --color-surface-3:    #2a2a2a;

    /* Text */
    --color-text:         #e6e2db;
    --color-text-muted:   #888880;
    --color-text-faint:   #555550;

    /* Borders */
    --color-border:       #2e2e2e;
    --color-border-light: #3a3a3a;

    /* Accent (warm gold for links) */
    --color-accent:       #c8963a;
    --color-accent-hover: #e0b05a;

    /* Fonts */
    --font-body:   system-ui, 'Segoe UI', sans-serif;
    --font-mono:   'Courier New', monospace;

    /* Spacing */
    --space-xs:  0.25rem;
    --space-sm:  0.5rem;
    --space-md:  1rem;
    --space-lg:  2rem;
    --space-xl:  3rem;

    /* Misc */
    --radius:      6px;
    --shadow-sm:   0 1px 4px rgba(0,0,0,.5);
    --shadow-md:   0 4px 16px rgba(0,0,0,.6);
    --transition:  150ms ease;
}

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

/* ── Skip link ──────────────────────────────── */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    background: var(--color-brand);
    color: #fff;
    padding: var(--space-sm) var(--space-md);
    border-radius: 0 0 var(--radius) var(--radius);
    font-size: 0.875rem;
    z-index: 9999;
    transition: top var(--transition);
}
.skip-link:focus { top: 0; }

/* ── Base ───────────────────────────────────── */
body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--color-text);
    background: var(--color-bg);
    /* subtle noise grain */
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
}

/* ── Links ──────────────────────────────────── */
a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition);
}
a:hover,
a:focus-visible {
    color: var(--color-accent-hover);
    text-decoration: underline;
    text-underline-offset: 3px;
}
a:focus-visible {
    outline: 2px solid var(--color-brand);
    outline-offset: 3px;
    border-radius: 2px;
    text-decoration: none;
}

/* ── Header ─────────────────────────────────── */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: inset 4px 0 0 var(--color-brand);
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
}

.site-header__title {
    text-align: center;
    flex: 1;
}

.ttl {
    font-size: clamp(1.1rem, 3.5vw, 1.8rem);
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--color-brand);
}
.tt2 {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* ── Language nav ───────────────────────────── */
.lang-nav {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
}
.lang-nav a {
    opacity: 0.55;
    transition: opacity var(--transition), transform var(--transition);
    display: inline-block;
    border-radius: 2px;
}
.lang-nav a:hover,
.lang-nav a:focus-visible {
    opacity: 1;
    transform: scale(1.12);
    text-decoration: none;
}
.lang-nav a[aria-current="true"] {
    opacity: 1;
    outline: 2px solid var(--color-brand);
    outline-offset: 2px;
}

/* ── Main grid ──────────────────────────────── */
.site-main {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-lg);
    max-width: 1100px;
    margin: var(--space-lg) auto;
    padding: 0 var(--space-lg);
}

/* ── Dict sections ──────────────────────────── */
.dict-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition);
}
.dict-section:hover {
    box-shadow: var(--shadow-md);
}

.dict-section h2 {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-brand);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border-light);
    text-align: center;
}

.dict-section ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.dict-section li {
    padding: 0.45rem 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9375rem;
    transition: background var(--transition), padding-left var(--transition);
}
.dict-section li:last-child {
    border-bottom: none;
}
.dict-section li:hover {
    background: var(--color-surface-2);
    padding-left: var(--space-xs);
    border-radius: 3px;
}

.dict-section li i {
    color: var(--color-text-faint);
    font-size: 0.8rem;
}

/* Second h2 inside a section (Military phrasebooks) */
.dict-section h2 ~ h2 {
    margin-top: var(--space-lg);
}

/* ── Footer ─────────────────────────────────── */
.site-footer {
    text-align: center;
    padding: var(--space-lg);
    color: var(--color-text-muted);
    font-size: 0.8125rem;
    border-top: 1px solid var(--color-border);
    margin-top: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    background: var(--color-surface);
}
.site-footer a {
    color: var(--color-text-muted);
    transition: color var(--transition);
}
.site-footer a:hover {
    color: var(--color-brand);
    text-decoration: none;
}

/* ── Responsive ─────────────────────────────── */
@media (max-width: 600px) {
    .site-header {
        flex-direction: column;
        padding: var(--space-md);
        box-shadow: inset 0 3px 0 var(--color-brand);
    }
    .site-main {
        padding: 0 var(--space-md);
        gap: var(--space-md);
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        transition: none !important;
    }
}

/* ── Light mode override (opt-in via system) ── */
@media (prefers-color-scheme: light) {
    :root {
        --color-brand:        #cc3300;
        --color-brand-hover:  #ee4400;
        --color-bg:           #f8f8f6;
        --color-surface:      #ffffff;
        --color-surface-2:    #f2f2f0;
        --color-surface-3:    #ebebea;
        --color-text:         #1a1a18;
        --color-text-muted:   #5a5a55;
        --color-text-faint:   #9a9a95;
        --color-border:       #e0e0da;
        --color-border-light: #d0d0ca;
        --color-accent:       #8b5a10;
        --color-accent-hover: #a06a18;
        --shadow-sm:          0 1px 3px rgba(0,0,0,.08);
        --shadow-md:          0 4px 12px rgba(0,0,0,.10);
    }
    .site-header {
        background: var(--color-brand);
        color: #fff;
        box-shadow: none;
    }
    .ttl  { color: #fff; }
    .tt2  { color: rgba(255,255,255,.85); }
    .lang-nav a[aria-current="true"] { outline-color: #fff; }
    .site-footer { background: transparent; }
}

@media print {
    .skip-link { display: none; }
    body { background: #fff; color: #000; }
    a { color: #000; text-decoration: underline; }
}