/* ============================================================
   Cosmos Person — shared design system
   Used by index.html, explore.html, admin.html
   ============================================================ */

:root {
    /* Surfaces — neutral near-black; the photographs supply the color */
    --bg: #08090b;
    --bg-elev: #0e1013;
    --bg-panel: #12151a;
    --line: rgba(255, 255, 255, 0.08);
    --line-strong: rgba(255, 255, 255, 0.16);

    /* Type */
    --ink: #eef1f3;
    --ink-2: #a9b1b7;
    --ink-3: #69707a;

    /* Accent — a single desaturated teal, used sparingly */
    --accent: #7cd1c8;
    --accent-dim: rgba(124, 209, 200, 0.35);
    --accent-faint: rgba(124, 209, 200, 0.12);

    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-ui: 'Inter', -apple-system, 'Helvetica Neue', sans-serif;

    --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
    --shadow-lift: 0 20px 60px rgba(0, 0, 0, 0.55);

    --header-h: 72px;
}

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

html { scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-ui);
    font-weight: 300;
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

::selection { background: var(--accent-dim); color: var(--ink); }

img { max-width: 100%; display: block; }

a { color: inherit; }

button { font-family: var(--font-ui); }

:focus-visible {
    outline: 1px solid var(--accent);
    outline-offset: 3px;
}

/* ---------- Shared type utilities ---------- */

.label {
    font-family: var(--font-ui);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--ink-3);
}

.display {
    font-family: var(--font-display);
    font-weight: 300;
    line-height: 1.08;
    letter-spacing: 0.01em;
}

/* ---------- Site header ---------- */

.site-header {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 1000;
    height: var(--header-h);
    display: flex;
    align-items: center;
    padding: 0 clamp(20px, 4vw, 48px);
    transition: background 0.45s var(--ease), border-color 0.45s var(--ease);
    border-bottom: 1px solid transparent;
    background: linear-gradient(to bottom, rgba(5, 6, 8, 0.55), transparent);
}

.site-header.scrolled {
    background: rgba(8, 9, 11, 0.82);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    border-bottom-color: var(--line);
}

.header-inner {
    width: 100%;
    max-width: 1560px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.wordmark {
    text-decoration: none;
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.42em;
    text-transform: uppercase;
    color: var(--ink);
    white-space: nowrap;
}

.wordmark span { color: var(--ink-3); transition: color 0.3s; }
.wordmark:hover span { color: var(--accent); }

/* The first O in Cosmos is a cat. Non-negotiable. */
.cat-o {
    display: inline-block;
    height: 0.8em;
    width: auto;
    vertical-align: -0.03em;
    margin: 0 0.1em;
}

.wordmark:hover .cat-o { color: var(--accent); }
.cat-o { transition: color 0.3s; }

.site-nav {
    display: flex;
    align-items: center;
    gap: clamp(18px, 3vw, 40px);
}

.site-nav a {
    text-decoration: none;
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--ink-2);
    padding: 6px 0;
    border-bottom: 1px solid transparent;
    transition: color 0.3s, border-color 0.3s;
}

.site-nav a:hover { color: var(--ink); }

.site-nav a.active {
    color: var(--ink);
    border-bottom-color: var(--accent);
}

.site-nav a.nav-accent { color: var(--accent); }
.site-nav a.nav-accent:hover { color: var(--ink); }

@media (max-width: 640px) {
    .nav-x { display: none; }
    .wordmark { letter-spacing: 0.3em; }
    /* the current page's own link is redundant on small screens */
    .site-nav a.active { display: none; }
}

/* ---------- Footer ---------- */

.site-footer {
    border-top: 1px solid var(--line);
    padding: 72px clamp(20px, 4vw, 48px) 48px;
    text-align: center;
}

.footer-wordmark {
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.42em;
    text-transform: uppercase;
    color: var(--ink-2);
    text-decoration: none;
}

.footer-links {
    margin-top: 28px;
    display: flex;
    justify-content: center;
    gap: 36px;
    flex-wrap: wrap;
}

.footer-links a {
    font-size: 0.6875rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--ink-3);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-fine {
    margin-top: 36px;
    font-size: 0.6875rem;
    letter-spacing: 0.08em;
    color: var(--ink-3);
    opacity: 0.7;
}

.footer-fine a { color: inherit; text-decoration: none; }
.footer-fine a:hover { color: var(--ink-2); }

/* ---------- Shared controls ---------- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 13px 28px;
    background: transparent;
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    color: var(--ink);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    transition: border-color 0.3s, background 0.3s, color 0.3s;
}

.btn:hover { border-color: var(--accent); color: var(--accent); }

.btn.solid {
    background: var(--ink);
    border-color: var(--ink);
    color: #0a0b0d;
}

.btn.solid:hover { background: var(--accent); border-color: var(--accent); color: #06110f; }

.btn svg { width: 14px; height: 14px; }

.icon-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--line);
    border-radius: 50%;
    color: var(--ink-2);
    cursor: pointer;
    transition: color 0.3s, border-color 0.3s, background 0.3s;
}

.icon-btn:hover { color: var(--ink); border-color: var(--line-strong); background: rgba(255, 255, 255, 0.07); }

.icon-btn svg { width: 20px; height: 20px; }

/* ---------- Scrollbar ---------- */

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #23272d; border-radius: 5px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: #2f353c; }

/* ---------- Motion preferences ---------- */

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