/* ============================================================
   tfr.bthlcorp.com — Ternary Fission Reactor / Stargate Framework
   BTHLCorp portal theme: black depth, purple→cyan→green gradient,
   Cinzel display + Inter body. Matches bthlcorp.com design system.
   ============================================================ */

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

:root {
    --bg: #000000;
    --bg2: #05050f;
    --bg3: #0a0a1a;
    --card: #0d0d20;
    --card2: #12122a;
    --border: #1a1a3e;
    --border2: #252550;
    --portal-purple: #8b5cf6;
    --portal-blue: #3b82f6;
    --portal-cyan: #06b6d4;
    --portal-green: #10b981;
    --portal-gold: #f59e0b;
    --glow-purple: rgba(139,92,246,.15);
    --glow-green: rgba(16,185,129,.12);
    --glow-cyan: rgba(6,182,212,.12);
    --text: #e2e8f0;
    --text-dim: #94a3b8;
    --text-muted: #64748b;
    --font-display: 'Cinzel', serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'SF Mono', SFMono-Regular, Menlo, Consolas, monospace;
    --radius: 12px;
}

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font-body);
    font-size: 1.02rem;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

.wrap { width: min(980px, 100% - 2.5rem); margin-inline: auto; }

h1, h2, h3, h4 { color: var(--text); line-height: 1.25; margin: 1.6em 0 .5em; }
h1 { font-family: var(--font-display); font-size: 2rem; }
h2 { font-family: var(--font-display); font-size: 1.4rem; padding-bottom: .4rem; border-bottom: 1px solid var(--border); }
h3 { font-size: 1.12rem; color: var(--portal-cyan); }
h4 { font-size: 1.02rem; }

a { color: var(--portal-cyan); text-decoration: none; transition: color .2s; }
a:hover { color: var(--portal-green); text-decoration: none; }

p { margin: 0 0 .9em; }
hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }
code {
    font-family: var(--mono);
    font-size: .88em;
    background: var(--card2);
    border: 1px solid var(--border);
    padding: .12em .4em;
    border-radius: 4px;
}
ul, ol { margin: 0 0 1em; padding-left: 1.4rem; }
li { margin-bottom: .35em; }
blockquote { border-left: 3px solid var(--portal-purple); margin: 1em 0; padding: .2em 1em; color: var(--text-dim); }

.glow-green { filter: drop-shadow(0 0 8px rgba(16,185,129,.4)); }

/* ---------- Header ---------- */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(0,0,0,.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 3.6rem; gap: 1rem; position: relative; }
.brand { display: flex; align-items: center; gap: .5rem; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand-text {
    font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; letter-spacing: .04em;
    background: linear-gradient(135deg, var(--portal-purple), var(--portal-green));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.brand-sub { font-size: .66rem; font-weight: 500; color: var(--text-muted); letter-spacing: .08em; text-transform: uppercase; }

.site-nav { display: flex; align-items: center; gap: .2rem; flex-wrap: wrap; }
.site-nav a { color: var(--text-dim); font-size: .82rem; font-weight: 500; padding: .45rem .6rem; border-radius: 8px; transition: all .2s; }
.site-nav a:hover, .site-nav a.is-active { color: var(--portal-green); background: rgba(16,185,129,.08); }
.nav-live { color: var(--portal-green) !important; border: 1px solid rgba(16,185,129,.3); }
.nav-live:hover { background: rgba(16,185,129,.12) !important; }
.nav-ext { color: var(--text-muted) !important; }
.nav-ext:hover { color: var(--portal-cyan) !important; }

.nav-toggle { display: none; background: none; border: 0; padding: .5rem; cursor: pointer; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; }

/* ---------- Hero ---------- */
.hero {
    padding: 4.5rem 0 3rem;
    background:
        radial-gradient(ellipse 60% 50% at 70% 20%, var(--glow-purple), transparent),
        radial-gradient(ellipse 50% 40% at 20% 80%, var(--glow-green), transparent);
    border-bottom: 1px solid var(--border);
}
.hero-kicker { text-transform: uppercase; letter-spacing: .18em; font-size: .75rem; color: var(--portal-cyan); margin-bottom: .8rem; }
.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5.5vw, 3rem); font-weight: 900; margin: 0 0 .4em;
    background: linear-gradient(135deg, var(--portal-purple) 0%, var(--portal-cyan) 40%, var(--portal-green) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-sub { font-size: 1.15rem; color: var(--text-dim); max-width: 46rem; margin-bottom: 1.6rem; font-weight: 300; }
.hero-actions { display: flex; gap: .8rem; flex-wrap: wrap; margin-bottom: 2.2rem; }

.btn {
    display: inline-flex; align-items: center; gap: .4rem;
    padding: .65rem 1.4rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: .9rem;
    border: 1px solid transparent;
    transition: all .25s;
}
.btn:hover { text-decoration: none; }
.btn-accent { background: linear-gradient(135deg, var(--portal-purple), var(--portal-green)); color: #fff; }
.btn-accent:hover { opacity: .9; transform: translateY(-1px); box-shadow: 0 4px 15px var(--glow-purple); color: #fff; }
.btn-ghost { border-color: var(--border2); color: var(--text-dim); background: transparent; }
.btn-ghost:hover { border-color: var(--portal-green); color: var(--portal-green); background: rgba(16,185,129,.06); }

.hero-bases { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1rem; }
.base-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.2rem;
    display: flex; align-items: baseline; gap: .7rem;
    transition: all .25s;
}
.base-card:hover { border-color: var(--portal-green); box-shadow: 0 0 20px var(--glow-green); transform: translateY(-2px); }
.base-n { font-size: 1.9rem; font-weight: 800; color: var(--portal-green); font-family: var(--mono); }
.base-l { font-size: .82rem; color: var(--text-dim); line-height: 1.3; }

/* ---------- Document body ---------- */
.doc { padding: 2.5rem 0 1rem; }
.doc h1 { font-size: 1.8rem; margin-top: .5em; }
.doc h1 + h2 { border: 0; font-family: var(--font-body); color: var(--text-dim); font-size: 1.15rem; font-weight: 500; margin-top: 0; }
.doc strong { color: var(--text); }

.math-display {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.1rem 1.3rem;
    margin: 1.2rem 0;
    overflow-x: auto;
    text-align: center;
    font-size: 1.05rem;
}
.math-inline { white-space: nowrap; }
.katex { color: var(--text); }

.table-wrap { overflow-x: auto; margin: 1.4rem 0; border: 1px solid var(--border); border-radius: 10px; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { padding: .6rem .9rem; text-align: left; border-bottom: 1px solid var(--border); }
th { background: var(--bg3); color: var(--text-dim); font-weight: 600; font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; white-space: nowrap; }
tr:hover td { background: rgba(139,92,246,.04); }
tr:last-child td { border-bottom: 0; }

/* status badges */
.badge {
    display: inline-block;
    font-size: .68rem;
    font-weight: 800;
    letter-spacing: .07em;
    padding: .14em .55em;
    border-radius: 5px;
    vertical-align: .1em;
    white-space: nowrap;
}
.badge-est  { background: rgba(16,185,129,.15); color: var(--portal-green);  border: 1px solid rgba(16,185,129,.4); }
.badge-eng  { background: rgba(59,130,246,.15); color: var(--portal-blue);   border: 1px solid rgba(59,130,246,.4); }
.badge-theo { background: rgba(139,92,246,.15); color: var(--portal-purple); border: 1px solid rgba(139,92,246,.4); }
.badge-todo { background: rgba(245,158,11,.15); color: var(--portal-gold);   border: 1px solid rgba(245,158,11,.4); }
.badge-run  { background: rgba(6,182,212,.15);  color: var(--portal-cyan);   border: 1px solid rgba(6,182,212,.4); }

/* ---------- Pager ---------- */
.doc-pager {
    display: flex; justify-content: space-between; gap: 1rem;
    padding: 1.5rem 0 3rem;
}
.pager-link {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: .7rem 1.2rem;
    font-size: .9rem;
    font-weight: 600;
    color: var(--text);
    transition: all .25s;
}
.pager-link:hover { border-color: var(--portal-green); color: var(--portal-green); box-shadow: 0 0 20px var(--glow-green); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg2); padding: 2.5rem 0 1rem; margin-top: 3rem; }
.footer-inner { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 2rem; }
.footer-col h3 { font-size: .82rem; font-family: var(--font-body); text-transform: uppercase; letter-spacing: .1em; color: var(--text); margin: 0 0 .7rem; }
.footer-col h3.footer-brand {
    font-family: var(--font-display); font-size: 1rem; text-transform: none; letter-spacing: .02em;
    background: linear-gradient(135deg, var(--portal-purple), var(--portal-green));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.footer-col p { font-size: .85rem; color: var(--text-dim); line-height: 1.6; }
.footer-col nav { display: flex; flex-direction: column; gap: .4rem; }
.footer-col nav a { font-size: .85rem; color: var(--text-dim); }
.footer-col nav a:hover { color: var(--portal-green); }
.footer-bottom { border-top: 1px solid var(--border); margin-top: 2rem; padding-top: 1rem; }
.footer-bottom p { font-size: .78rem; color: var(--text-muted); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .site-nav a { padding: .4rem .5rem; font-size: .78rem; }
}
@media (max-width: 860px) {
    .brand-sub { display: none; }
    .nav-toggle { display: block; }
    .site-nav {
        display: none;
        position: absolute; top: 100%; left: 0; right: 0;
        flex-direction: column; align-items: stretch;
        background: rgba(0,0,0,.97);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border);
        padding: .5rem;
        gap: 0;
        z-index: 200;
    }
    .site-nav.is-open { display: flex; }
    .site-nav a { padding: .75rem 1rem; font-size: .92rem; border-bottom: 1px solid var(--border); border-radius: 0; }
    .site-nav a:last-child { border-bottom: none; }
    .footer-inner { grid-template-columns: 1fr; }
    .doc-pager { flex-direction: column; }
}

/* ---------- Touch targets + safe areas ---------- */
@media (pointer: coarse) {
    .site-nav a { min-height: 44px; display: flex; align-items: center; }
    .btn { min-height: 44px; }
    a { -webkit-tap-highlight-color: rgba(139,92,246,.15); }
}
@supports (padding: env(safe-area-inset-bottom)) {
    .site-header { padding-left: max(0px, env(safe-area-inset-left)); padding-right: max(0px, env(safe-area-inset-right)); }
    .site-footer { padding-bottom: max(1rem, env(safe-area-inset-bottom)); }
}