/* ============================================================
   GLOBAL STYLES — EPITA CTF Archive
   ============================================================ */

:root {
    --bg: #070d1a;
    --surface: #0d1628;
    --surface2: #142035;
    --border: #1c2b44;
    --border2: #243554;
    --accent: #4a8fd4;
    --accent-dim: rgba(74,143,212,0.12);
    --text: #dde4f0;
    --text-dim: #9aaabf;
    --muted: #5c6d87;
    --green: #3fd672;
    --yellow: #f0b429;
    --red: #e56060;
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --radius: 6px;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
    font-size: 18px;
    scrollbar-width: thin;
    scrollbar-color: var(--border2) transparent;
}

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

::selection { background: rgba(74,143,212,0.28); color: var(--text); }

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Grain overlay — fixed pseudo so it never triggers GPU repaint on scroll */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.022;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size: 256px 256px;
}

/* ---- SITE HEADER ---- */
.site-header {
    border-bottom: 1px solid var(--border);
    padding: 0 2rem;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    height: 80px;
    background: rgba(7,13,26,0.96);
    backdrop-filter: blur(16px);
    z-index: 100;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.1rem;
}

.nav-title-link {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(0.75rem, 1.2vw, 1rem);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-dim);
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
    pointer-events: none;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.nav-logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.nav-logo-img {
    height: 54px;
    width: auto;
    object-fit: contain;
    opacity: 0.85;
}

.nav-logo-link:hover .nav-logo-img { opacity: 1; }

.nav-partners {
    position: relative;
    width: 130px;
    height: 54px;
}

.nav-partner-link {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    opacity: 0;
    transition: opacity 0.8s ease;
    pointer-events: none;
}

.nav-partner-link.active {
    opacity: 0.85;
    pointer-events: auto;
}

.nav-partner-link.active:hover { opacity: 1; }

.nav-logo-partner {
    max-height: 54px;
    max-width: 130px;
    width: auto;
    object-fit: contain;
}

.nav-logo-partner {
    max-height: 10vh;
    max-width: 200px;
}

.nav-logo-link:hover .nav-logo-img { opacity: 0.85; }

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.1rem;
    flex: 1;
}

.nav-link {
    background: none;
    border: none;
    color: var(--muted);
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.8vh, 1.3rem);
    padding: 0.4rem 0.85rem;
    cursor: pointer;
    text-decoration: none;
    border-radius: var(--radius);
    transition: color 0.15s, background 0.15s;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    white-space: nowrap;
    letter-spacing: 0.01em;
}

.nav-link:hover { color: var(--text); background: rgba(255,255,255,0.04); }

.nav-chevron {
    font-size: clamp(0.55rem, 0.8vh, 0.7rem);
    opacity: 0.5;
    transition: transform 0.2s var(--ease-out);
}

/* ---- DROPDOWNS ---- */
.nav-dropdown { position: relative; }
.nav-dropdown.open .nav-dropdown-menu { display: flex; }
.nav-dropdown.open .nav-chevron { transform: rotate(180deg); }

.nav-dropdown-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    padding-top: 6px;
    left: 0;
    background: var(--surface);
    border: 1px solid var(--border2);
    border-radius: var(--radius);
    min-width: 268px;
    max-height: 420px;
    overflow-y: auto;
    z-index: 200;
    box-shadow: 0 20px 48px rgba(0,0,0,0.65), 0 0 0 1px rgba(255,255,255,0.02);
    scrollbar-width: thin;
    scrollbar-color: var(--border2) transparent;
}

.nav-dd-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    font-size: 0.78rem;
    color: var(--muted);
    text-decoration: none;
    border-bottom: 1px solid var(--border);
    transition: background 0.1s, color 0.1s;
}

.nav-dd-item:last-child { border-bottom: none; }
.nav-dd-item:hover { background: var(--surface2); color: var(--text); }
.nav-dd-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.nav-dd-count {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--accent);
    background: var(--accent-dim);
    border: 1px solid rgba(74,143,212,0.2);
    padding: 1px 6px;
    border-radius: 3px;
    flex-shrink: 0;
}

/* ---- TAGS ---- */
.tag {
    background: var(--accent-dim);
    border: 1px solid rgba(74,143,212,0.18);
    color: rgba(74,143,212,0.9);
    font-size: 0.6rem;
    padding: 2px 8px;
    border-radius: 3px;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    white-space: nowrap;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    cursor: default;
    display: inline-block;
    font-family: var(--font-mono);
    text-decoration: none;
}

.tag-btn {
    cursor: pointer;
    background: none;
    border-color: rgba(74,143,212,0.18);
    font-family: var(--font-mono);
}

a.tag, .tag-btn { cursor: pointer; }

a.tag:hover, .tag-btn:hover {
    background: rgba(74,143,212,0.2);
    border-color: rgba(74,143,212,0.4);
    color: var(--accent);
}

/* ---- TAG FILTER BAR ---- */
.tag-filter-bar {
    padding: 1.25rem 3rem 0.25rem;
    display: flex;
    align-items: baseline;
    gap: 0.4rem;
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text);
}

.tag-filter-bar #tag-label { color: var(--accent); }

.tag-filter-bar button {
    background: none;
    border: none;
    color: var(--muted);
    font-size: 1rem;
    cursor: pointer;
    padding: 0 0.2rem;
    margin-left: 0.3rem;
    transition: color 0.15s;
}

.tag-filter-bar button:hover { color: var(--text); }

/* ---- FOOTER ---- */
footer {
    border-top: 1px solid var(--border);
    padding: 1.75rem 3rem;
    font-size: 0.68rem;
    color: var(--muted);
    text-align: center;
    margin-top: 4rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
    .site-header { padding-left: 1.25rem; padding-right: 1.25rem; }
}