:root {
  --bg-0: #08090d; --bg-1: #0b0e14; --bg-2: #12171f; --bg-card: #151b25; --bg-card-h: #1b2330;
  --t0: #edf2f7; --t1: rgba(237,242,247,.75); --t2: rgba(237,242,247,.40);
  --neon: #4ab3c8; --moss: #6a8fa0; --border: rgba(74,179,200,.13); --border-h: rgba(74,179,200,.40);
  --mono: 'JetBrains Mono', monospace;
  --body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --ease: cubic-bezier(.4,0,.2,1);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scrollbar-width: thin; scrollbar-color: var(--moss) var(--bg-2); }
body { background: var(--bg-0); color: var(--t0); font-family: var(--body); min-height: 100vh; }

a { color: inherit; }

#nav { position: sticky; top: 0; z-index: 100; background: rgba(6,10,6,.93); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); padding: 14px 0; }
.nav-w { max-width: 860px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.nav-logo { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.nav-logo img { width: 36px; height: 36px; border-radius: 50%; object-fit: cover; display: block; }
.nav-logo span { font-family: var(--mono); font-size: 12px; color: var(--t1); letter-spacing: .5px; }
.back-link { font-family: var(--mono); font-size: 11px; color: var(--neon); text-decoration: none; letter-spacing: 1px; text-transform: uppercase; display: inline-flex; align-items: center; gap: 6px; transition: color .2s; }
.back-link:hover { color: var(--t0); }

.wrap { max-width: 860px; margin: 0 auto; padding: 56px 24px 96px; }

/* ── Loading / error states ── */
.state-box { text-align: center; padding: 100px 20px; font-family: var(--mono); color: var(--t2); font-size: 13px; letter-spacing: 1px; }
.state-box a { color: var(--neon); text-decoration: underline; }
.dot-load span { animation: blink 1.4s ease-in-out infinite; }
@keyframes blink { 0%,100%{opacity:.2} 50%{opacity:1} }

/* ── Portal list mode ── */
.portal-hdr { margin-bottom: 44px; }
.sec-lbl { font-family: var(--mono); font-size: 10px; color: var(--moss); letter-spacing: 3px; text-transform: uppercase; margin-bottom: 10px; }
.sec-lbl::before { content: '// '; color: var(--neon); }
.sec-h { font-family: var(--mono); font-size: clamp(26px,5vw,42px); font-weight: 700; margin-bottom: 12px; }
.sec-h span { background: linear-gradient(135deg,var(--neon),#7fd4e6); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.sec-sub { font-size: 14px; color: var(--t1); line-height: 1.7; max-width: 560px; }

.portal-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(260px,1fr)); gap: 20px; }
.portal-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 4px; overflow: hidden; text-decoration: none; display: flex; flex-direction: column; transition: all .3s; }
.portal-card:hover { border-color: var(--border-h); background: var(--bg-card-h); transform: translateY(-3px); box-shadow: 0 12px 36px rgba(0,0,0,.28); }
.portal-img { width: 100%; height: 130px; object-fit: cover; display: block; filter: brightness(.65) saturate(.85); transition: filter .3s; }
.portal-card:hover .portal-img { filter: brightness(.85) saturate(1.05); }
.portal-body { padding: 16px 18px; flex: 1; }
.portal-meta { font-family: var(--mono); font-size: 9px; color: var(--t2); letter-spacing: 1px; margin-bottom: 8px; display: flex; gap: 10px; }
.portal-title { font-family: var(--mono); font-size: 13px; font-weight: 700; line-height: 1.4; margin-bottom: 8px; }
.portal-card:hover .portal-title { color: var(--neon); }
.portal-exc { font-size: 12px; color: var(--t1); line-height: 1.65; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.portal-more-wrap { display: flex; justify-content: center; margin-top: 36px; }
.portal-more-btn { background: transparent; border: 1px solid var(--neon); color: var(--neon); font-family: var(--mono); font-size: 11px; letter-spacing: 2px; text-transform: uppercase; padding: 10px 32px; border-radius: 2px; cursor: pointer; transition: all .25s; }
.portal-more-btn:hover { background: var(--neon); color: var(--bg-0); }

/* ── Article mode ── */
.art-meta { display: flex; align-items: center; gap: 12px; font-family: var(--mono); font-size: 10px; color: var(--t2); letter-spacing: 1px; margin-bottom: 18px; }
.art-title { font-family: var(--mono); font-size: clamp(24px,4.5vw,38px); font-weight: 700; line-height: 1.25; margin-bottom: 18px; }
.art-cover { width: 100%; border-radius: 4px; margin-bottom: 30px; border: 1px solid var(--border); display: block; }
.art-source { font-family: var(--mono); font-size: 11px; color: var(--neon); text-decoration: none; border: 1px solid var(--border); border-radius: 2px; padding: 8px 16px; display: inline-flex; align-items: center; gap: 8px; letter-spacing: .5px; transition: all .2s; margin-bottom: 40px; }
.art-source:hover { background: var(--neon); color: var(--bg-0); border-color: var(--neon); }

/* ── Read-aloud player (Web Speech API) ── */
.art-actions { display: flex; flex-wrap: wrap; gap: 12px; padding: 10px 0; margin-bottom: 30px; }
.art-actions .art-source { margin: 0; }
/* Controls follow the reader while audio is active, since playback auto-scrolls */
.art-actions.is-live { position: sticky; top: 65px; z-index: 50; background: var(--bg-0); border-bottom: 1px solid var(--border); }
.tts-btn { background: transparent; border: 1px solid var(--neon); color: var(--neon); font-family: var(--mono); font-size: 11px; letter-spacing: .5px; padding: 8px 16px; border-radius: 2px; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; transition: all .2s; }
.tts-btn:hover { background: var(--neon); color: var(--bg-0); }
.tts-btn[hidden] { display: none; }
.tts-stop { border-color: var(--border); color: var(--t1); }
.tts-stop:hover { background: var(--bg-card-h); color: var(--t0); border-color: var(--border-h); }
.art-body .tts-on { color: var(--t0); background: rgba(74,179,200,.08); box-shadow: 0 0 0 8px rgba(74,179,200,.08); border-radius: 2px; transition: background .3s, box-shadow .3s; }

.art-body { font-size: 16px; line-height: 1.85; color: var(--t1); }
.art-body p { margin-bottom: 20px; }
.art-body h1, .art-body h2, .art-body h3, .art-body h4 { font-family: var(--mono); color: var(--t0); font-weight: 700; line-height: 1.4; margin: 36px 0 16px; }
.art-body h1 { font-size: 26px; } .art-body h2 { font-size: 22px; } .art-body h3 { font-size: 18px; } .art-body h4 { font-size: 16px; }
.art-body img, .art-body figure { max-width: 100%; display: block; margin: 24px auto; border-radius: 4px; }
.art-body figure img { border: 1px solid var(--border); }
.art-body figcaption { font-family: var(--mono); font-size: 11px; color: var(--t2); text-align: center; margin-top: 8px; }
.art-body a { color: var(--neon); text-decoration: underline; text-underline-offset: 2px; }
.art-body strong { color: var(--t0); font-weight: 600; }
.art-body blockquote { border-left: 2px solid var(--neon); padding: 4px 0 4px 20px; margin: 24px 0; color: var(--t0); font-style: italic; }
.art-body ul, .art-body ol { margin: 0 0 20px 22px; }
.art-body li { margin-bottom: 8px; }
.art-body pre { background: var(--bg-2); border: 1px solid var(--border); border-radius: 4px; padding: 16px; overflow-x: auto; margin: 24px 0; font-family: var(--mono); font-size: 13px; }
.art-body code { font-family: var(--mono); background: var(--bg-2); padding: 2px 6px; border-radius: 2px; font-size: .9em; }
.art-body pre code { background: none; padding: 0; }
.art-body hr { border: none; border-top: 1px solid var(--border); margin: 36px 0; }

.art-foot { margin-top: 56px; padding-top: 28px; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; }

@media (max-width: 600px) {
  .wrap { padding: 36px 18px 72px; }
  .nav-logo span { display: none; }
}