/* ============================================================
   MSBSU.COM — design system
   Tech-dark by default, light theme via [data-theme="light"].
   ============================================================ */

:root {
  --font: 'Inter', 'Segoe UI', system-ui, -apple-system, Roboto, 'Helvetica Neue', sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  --radius: 14px;
  --radius-sm: 9px;
  --nav-h: 64px;
  --top-h: 56px;
  --max-w: 980px;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #070b12;
  --bg-2: #0b111c;
  --card: rgba(17, 24, 39, 0.72);
  --card-solid: #101826;
  --border: rgba(120, 150, 200, 0.16);
  --text: #e6edf7;
  --text-2: #92a3bd;
  --accent: #38bdf8;
  --accent-2: #a78bfa;
  --accent-glow: rgba(56, 189, 248, 0.35);
  --danger: #f87171;
  --ok: #34d399;
  --grid-line: rgba(90, 130, 190, 0.05);
  --rain: rgba(160, 200, 255, 0.35);
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
  --board-light: #a8b8cf;
  --board-dark: #4a5a75;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f3f6fb;
  --bg-2: #e9eef7;
  --card: rgba(255, 255, 255, 0.85);
  --card-solid: #ffffff;
  --border: rgba(30, 60, 110, 0.14);
  --text: #14202f;
  --text-2: #5a6c84;
  --accent: #0284c7;
  --accent-2: #7c3aed;
  --accent-glow: rgba(2, 132, 199, 0.22);
  --danger: #dc2626;
  --ok: #059669;
  --grid-line: rgba(30, 60, 110, 0.05);
  --rain: rgba(70, 110, 170, 0.35);
  --shadow: 0 8px 26px rgba(30, 50, 90, 0.12);
  --board-light: #e6ecf5;
  --board-dark: #7f93b2;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding-bottom: calc(var(--nav-h) + env(safe-area-inset-bottom));
  overflow-x: hidden;
  transition: background 0.35s, color 0.35s;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
button { font-family: inherit; }

/* ---------- atmosphere layers ---------- */
#rain-canvas {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  opacity: 0; transition: opacity 1.2s ease;
}
#rain-canvas.raining { opacity: 1; }
#lightning {
  position: fixed; inset: 0; z-index: 2; pointer-events: none;
  background: radial-gradient(ellipse at 50% -10%, rgba(190, 220, 255, 0.9), rgba(140, 170, 255, 0.25) 45%, transparent 75%);
  opacity: 0;
}
#lightning.flash { animation: thunder-flash 0.9s ease-out; }
@keyframes thunder-flash {
  0% { opacity: 0; } 6% { opacity: .85; } 12% { opacity: .1; }
  20% { opacity: .6; } 32% { opacity: .05; } 45% { opacity: .25; } 100% { opacity: 0; }
}
.bg-grid {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse at 50% 0%, black 30%, transparent 80%);
}
@media (prefers-reduced-motion: reduce) {
  #rain-canvas, #lightning, .orb, #scroll-progress { display: none !important; }
}

/* ---------- 3D scroll-driven layer ---------- */
#scroll-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 120;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0); transform-origin: 0 50%;
  box-shadow: 0 0 10px var(--accent-glow);
  pointer-events: none;
}
.orb {
  position: fixed; z-index: 0; pointer-events: none; border-radius: 50%;
  filter: blur(70px); opacity: .5; will-change: transform;
  animation: orb-float 16s ease-in-out infinite alternate;
}
.orb-a { width: 420px; height: 420px; top: -80px; right: -120px;
  background: radial-gradient(circle, var(--accent-glow), transparent 65%); }
.orb-b { width: 520px; height: 520px; top: 55vh; left: -180px; animation-delay: -6s;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent-2) 32%, transparent), transparent 65%); }
.orb-c { width: 300px; height: 300px; top: 120vh; right: 8vw; animation-delay: -11s;
  background: radial-gradient(circle, var(--accent-glow), transparent 60%); }
@keyframes orb-float {
  from { margin-top: 0; margin-left: 0; }
  to { margin-top: 44px; margin-left: 26px; }
}
[data-theme="light"] .orb { opacity: .35; }

/* Reveal-on-scroll: elements rise with a 3D perspective rotation. */
[data-rv] {
  opacity: 0;
  transform: perspective(900px) rotateX(9deg) translateY(36px) scale(.97);
  transform-origin: 50% 100%;
}
[data-rv].rv-in {
  opacity: 1;
  transform: none;
  transition:
    opacity .6s cubic-bezier(.22,.65,.3,1) var(--rv-delay, 0ms),
    transform .7s cubic-bezier(.22,.65,.3,1) var(--rv-delay, 0ms);
}
/* Cards keep their own hover transform after reveal (tilt handled inline). */
.content-card, .tool-card { will-change: transform; transition: transform .25s ease, border-color .22s, box-shadow .22s; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  height: var(--top-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 18px;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.05rem; color: var(--text); letter-spacing: 0.06em; }
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--accent); text-shadow: 0 0 14px var(--accent-glow); }
.topbar-actions { display: flex; align-items: center; gap: 10px; }
.icon-btn {
  background: transparent; border: 1px solid var(--border); color: var(--text);
  width: 36px; height: 36px; border-radius: 10px; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.icon-btn:hover { border-color: var(--accent); box-shadow: 0 0 12px var(--accent-glow); }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: none; }
.avatar-mini { width: 32px; height: 32px; border-radius: 50%; border: 1px solid var(--border); cursor: pointer; }
.user-chip { display: flex; align-items: center; gap: 8px; }

/* ---------- layout ---------- */
#app { position: relative; z-index: 5; max-width: var(--max-w); margin: 0 auto; padding: 0 16px; }
.view { animation: view-in 0.35s ease; }
@keyframes view-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.view-head { padding: 26px 0 10px; }
.view-head h1 { font-size: 1.7rem; letter-spacing: -0.02em; }
.section { margin: 34px 0; }
.section-title {
  display: flex; align-items: baseline; justify-content: space-between;
  font-size: 1.15rem; margin-bottom: 14px; letter-spacing: -0.01em;
}
.section-title span { position: relative; padding-left: 14px; }
.section-title span::before {
  content: ''; position: absolute; left: 0; top: 3px; bottom: 3px; width: 4px;
  border-radius: 4px; background: linear-gradient(180deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 10px var(--accent-glow);
}
.see-all { font-size: 0.85rem; font-weight: 600; }
.muted { color: var(--text-2); }
.footer { text-align: center; color: var(--text-2); font-size: 0.85rem; padding: 30px 0 18px; }

/* ---------- cards, buttons, inputs ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 18px;
}
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.content-card { padding: 0; overflow: hidden; cursor: pointer; transition: transform 0.22s, border-color 0.22s, box-shadow 0.22s; }
.content-card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: 0 10px 34px var(--accent-glow); }
.content-card .cover { width: 100%; aspect-ratio: 16/9; object-fit: cover; display: block; background: var(--bg-2); }
.content-card .cover-ph { width: 100%; aspect-ratio: 16/9; display: flex; align-items: center; justify-content: center; font-size: 2rem; background: linear-gradient(135deg, var(--bg-2), var(--card-solid)); color: var(--accent); }
.content-card .body { padding: 14px 16px 16px; }
.content-card h3 { font-size: 1.02rem; margin-bottom: 6px; }
.content-card p { font-size: 0.86rem; color: var(--text-2); line-height: 1.5; max-height: 4.2em; overflow: hidden; }
.card-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 10px; font-size: 0.75rem; color: var(--text-2); }

.btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  border: 1px solid var(--border); border-radius: 10px;
  background: var(--card-solid); color: var(--text);
  padding: 10px 18px; font-size: 0.92rem; font-weight: 600; cursor: pointer;
  transition: all 0.2s;
}
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border: none; color: #fff;
  box-shadow: 0 4px 18px var(--accent-glow);
}
.btn-primary:hover { filter: brightness(1.1); transform: translateY(-1px); }
.btn-ghost { background: transparent; }
.btn-sm { padding: 6px 12px; font-size: 0.82rem; border-radius: 8px; }
.btn-danger { border-color: var(--danger); color: var(--danger); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.input, textarea.input, select.input {
  width: 100%; background: var(--bg-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 11px 14px; font-size: 0.95rem; font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--card); border: 1px solid var(--border);
  padding: 5px 12px; border-radius: 999px; font-size: 0.78rem; color: var(--text-2);
}
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.chip.sel, .chip:hover { border-color: var(--accent); color: var(--accent); cursor: pointer; }
.tabs { display: inline-flex; background: var(--bg-2); border: 1px solid var(--border); border-radius: 11px; padding: 4px; gap: 4px; margin-top: 10px; }
.tab { border: none; background: transparent; color: var(--text-2); padding: 7px 18px; border-radius: 8px; font-weight: 600; font-size: 0.88rem; cursor: pointer; }
.tab.active { background: var(--card-solid); color: var(--accent); box-shadow: 0 2px 8px rgba(0,0,0,0.25); }
.pager { display: flex; justify-content: center; gap: 8px; margin: 22px 0; }
.toast {
  position: fixed; bottom: calc(var(--nav-h) + 18px); left: 50%; transform: translateX(-50%);
  background: var(--card-solid); border: 1px solid var(--accent); color: var(--text);
  padding: 11px 20px; border-radius: 12px; z-index: 200; font-size: 0.9rem;
  box-shadow: 0 6px 26px var(--accent-glow); max-width: 92vw;
}

/* ---------- hero ---------- */
.hero { text-align: center; padding: 46px 0 8px; }
.hero-avatar-ring {
  width: 132px; height: 132px; margin: 0 auto 18px; border-radius: 50%;
  padding: 4px; background: conic-gradient(from 180deg, var(--accent), var(--accent-2), var(--accent));
  box-shadow: 0 0 34px var(--accent-glow);
  animation: ring-spin 9s linear infinite;
}
@keyframes ring-spin { to { filter: hue-rotate(360deg); } }
.hero-avatar-ring img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; background: var(--bg-2); display: block; }
.hero-name { font-size: clamp(1.9rem, 6vw, 2.8rem); letter-spacing: -0.03em; }
.hero-tagline {
  margin-top: 8px; font-size: clamp(1rem, 3.4vw, 1.25rem); font-weight: 600;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-details { margin: 12px auto 0; max-width: 560px; color: var(--text-2); line-height: 1.6; }
.hero-meta { margin-top: 16px; display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; }
.socials { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.socials a {
  width: 42px; height: 42px; border-radius: 12px; display: inline-flex; align-items: center; justify-content: center;
  background: var(--card); border: 1px solid var(--border); color: var(--text-2);
  transition: all 0.2s;
}
.socials a:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-3px); box-shadow: 0 6px 16px var(--accent-glow); }
.about-card { line-height: 1.75; color: var(--text); white-space: pre-wrap; }
.contact-cta { text-align: center; padding: 30px; }
.contact-cta h3 { margin-bottom: 8px; }
.contact-cta .btn { margin-top: 14px; }
.featured-strip { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(240px, 1fr); gap: 14px; overflow-x: auto; padding-bottom: 8px; scroll-snap-type: x mandatory; }
.featured-strip .content-card { scroll-snap-align: start; }
.badge {
  display: inline-block; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  background: linear-gradient(90deg, var(--accent), var(--accent-2)); color: #fff;
  padding: 3px 9px; border-radius: 999px; margin-bottom: 8px;
}
.otd-teaser { font-size: 0.92rem; line-height: 1.65; }
.otd-year { color: var(--accent); font-weight: 700; font-family: var(--mono); margin-right: 8px; }

/* ---------- post detail / blocks ---------- */
#post-detail { padding: 20px 0 40px; }
.post-hero { margin-bottom: 20px; }
.post-hero img { border-radius: var(--radius); width: 100%; max-height: 380px; object-fit: cover; }
.post-title { font-size: clamp(1.5rem, 5vw, 2.2rem); letter-spacing: -0.02em; margin: 14px 0 8px; }
.post-meta { display: flex; flex-wrap: wrap; gap: 10px; color: var(--text-2); font-size: 0.83rem; align-items: center; }
.post-content { margin-top: 26px; line-height: 1.8; font-size: 1.02rem; }
.post-content > * + * { margin-top: 18px; }
.post-content h2 { font-size: 1.45rem; margin-top: 34px; }
.post-content h3 { font-size: 1.18rem; margin-top: 26px; }
.post-content img { border-radius: var(--radius-sm); }
.post-content blockquote {
  border-left: 3px solid var(--accent); padding: 10px 18px; background: var(--card);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-2); font-style: italic;
}
.post-content pre {
  background: #0a0f18; color: #d6e4ff; border: 1px solid var(--border);
  padding: 16px; border-radius: var(--radius-sm); overflow-x: auto;
  font-family: var(--mono); font-size: 0.87rem; line-height: 1.6;
}
[data-theme="light"] .post-content pre { background: #101826; }
.post-content ul, .post-content ol { padding-left: 26px; }
.post-content hr { border: none; border-top: 1px dashed var(--border); }
.post-content figcaption { text-align: center; font-size: 0.8rem; color: var(--text-2); margin-top: 6px; }
.align-center { text-align: center; }
.align-right { text-align: right; }
.block-btn-wrap { text-align: center; }

/* reactions & comments */
.reactions-bar { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0 8px; }
.react-btn {
  border: 1px solid var(--border); background: var(--card); border-radius: 999px;
  padding: 7px 14px; cursor: pointer; font-size: 0.95rem; color: var(--text); transition: all 0.15s;
}
.react-btn:hover { border-color: var(--accent); transform: scale(1.06); }
.react-btn.mine { border-color: var(--accent); background: var(--accent-glow); }
.react-btn small { color: var(--text-2); margin-left: 5px; }
.comments { margin-top: 34px; }
.comment { display: flex; gap: 12px; padding: 14px 0; border-top: 1px solid var(--border); }
.comment img { width: 36px; height: 36px; border-radius: 50%; flex: none; }
.comment .c-body { flex: 1; min-width: 0; }
.comment .c-head { font-size: 0.85rem; display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.comment .c-head b { color: var(--text); }
.comment .c-head time { color: var(--text-2); font-size: 0.75rem; }
.comment p { margin-top: 4px; font-size: 0.93rem; line-height: 1.6; overflow-wrap: break-word; }
.comment .replies { margin-top: 8px; padding-left: 14px; border-left: 2px solid var(--border); }
.comment-form { margin-top: 18px; display: flex; flex-direction: column; gap: 10px; }
.reply-note { font-size: 0.8rem; color: var(--accent); display: flex; gap: 8px; align-items: center; }

/* ---------- tools ---------- */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; margin: 14px 0 26px; }
.tool-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 14px; text-align: center; cursor: pointer; transition: all 0.2s; color: var(--text);
}
.tool-card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: 0 8px 22px var(--accent-glow); }
.tool-card .t-ico { font-size: 1.7rem; margin-bottom: 8px; }
.tool-card h4 { font-size: 0.9rem; margin-bottom: 4px; }
.tool-card p { font-size: 0.73rem; color: var(--text-2); }
#tool-panel-body { margin-top: 14px; }
#tool-panel-body h3 { margin-bottom: 12px; }
.tool-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 12px 0; align-items: center; }
.tool-row label { font-size: 0.85rem; color: var(--text-2); }
.tool-out { margin-top: 14px; }
.drop-zone {
  border: 2px dashed var(--border); border-radius: var(--radius); padding: 34px 16px;
  text-align: center; color: var(--text-2); cursor: pointer; transition: all 0.2s;
}
.drop-zone:hover, .drop-zone.drag { border-color: var(--accent); color: var(--accent); background: var(--accent-glow); }
.otd-list { list-style: none; }
.otd-list li { padding: 12px 0; border-bottom: 1px solid var(--border); line-height: 1.6; font-size: 0.93rem; }
textarea.tool-ta { min-height: 140px; font-family: var(--mono); font-size: 0.86rem; resize: vertical; }

/* ---------- toolkit: progress ---------- */
.tk-progress { margin: 12px 0; }
.tk-progress-label { font-size: .82rem; color: var(--text-2); margin-bottom: 6px; }
.tk-progress-track { height: 8px; border-radius: 5px; background: var(--bg-2); overflow: hidden; border: 1px solid var(--border); }
.tk-progress-fill {
  height: 100%; width: 0; border-radius: 5px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width .25s ease;
}

/* ---------- pdf tools ---------- */
.pdf-thumbs { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 12px; margin: 14px 0; }
.pdf-thumb { text-align: center; border: 1px solid var(--border); border-radius: 10px; padding: 8px; background: var(--bg-2); }
.pdf-thumb.deleted { opacity: .35; }
.pdf-thumb .pt-img img { width: 100%; border-radius: 6px; display: block; background: #fff; }
.pdf-thumb .pt-img { transition: transform .25s; }
.pt-blank { aspect-ratio: 3/4; display: flex; align-items: center; justify-content: center; color: var(--text-2); background: #fff2; border: 1px dashed var(--border); border-radius: 6px; }
.pt-num { font-size: .72rem; color: var(--text-2); margin-top: 6px; }
.pt-actions { display: flex; justify-content: center; gap: 2px; margin-top: 4px; flex-wrap: wrap; }
.pt-actions button {
  border: 1px solid var(--border); background: var(--card-solid); color: var(--text);
  border-radius: 6px; cursor: pointer; font-size: .72rem; padding: 3px 6px;
}
.pt-actions button:hover { border-color: var(--accent); color: var(--accent); }
.file-list { margin: 12px 0; }
.file-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--border); font-size: .88rem; }

.anno-bar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 12px 0; }
.anno-stage { overflow: auto; max-height: 66vh; border: 1px solid var(--border); border-radius: 10px; background: var(--bg-2); padding: 10px; }
.anno-stack { position: relative; margin: 0 auto; width: fit-content; }
.anno-base { display: block; max-width: 100%; border-radius: 4px; }
.anno-overlay { position: absolute; inset: 0; width: 100%; height: 100%; cursor: crosshair; touch-action: none; }
.sig-pad { width: 100%; background: #fff; border-radius: 10px; border: 1px dashed var(--border); touch-action: none; cursor: crosshair; }
.sig-box { position: absolute; transform: translate(-50%, -50%); cursor: grab; filter: drop-shadow(0 2px 8px rgba(0,0,0,.35)); touch-action: none; }
.sig-box:active { cursor: grabbing; }

/* ---------- games ---------- */
.game-hud { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 12px; }
.game-canvas { width: 100%; max-width: 480px; display: block; margin: 0 auto; border-radius: 12px; border: 1px solid var(--border); touch-action: none; }
.g2-board {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px;
  max-width: 380px; margin: 0 auto; background: var(--bg-2);
  border: 1px solid var(--border); border-radius: 14px; padding: 8px;
  touch-action: none; transition: opacity .3s;
}
.g2-board.g2-over { opacity: .45; }
.g2-cell {
  aspect-ratio: 1/1; border-radius: 9px; background: var(--card-solid);
  display: flex; align-items: center; justify-content: center; font-weight: 800;
}
.me-board { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; max-width: 400px; margin: 0 auto; }
.me-card {
  aspect-ratio: 1/1; border-radius: 12px; border: 1px solid var(--border);
  background: var(--card-solid); cursor: pointer; position: relative;
  transform-style: preserve-3d; transition: transform .4s; font-size: 1.7rem;
}
.me-card .me-front, .me-card .me-back {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  backface-visibility: hidden; border-radius: 12px;
}
.me-card .me-front { color: var(--text-2); }
.me-card .me-back { transform: rotateY(180deg); background: var(--accent-glow); }
.me-card.open, .me-card.done { transform: rotateY(180deg); }
.me-card.done { border-color: var(--ok); cursor: default; }
.tt-board { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; max-width: 320px; margin: 0 auto; }
.tt-cell {
  aspect-ratio: 1/1; font-size: 2.2rem; font-weight: 800; border-radius: 12px;
  border: 1px solid var(--border); background: var(--card-solid); color: var(--accent); cursor: pointer;
  transition: all .15s;
}
.tt-cell:hover:not(.filled) { border-color: var(--accent); }

/* ---------- portfolio generator ---------- */
.pf-layout { display: grid; grid-template-columns: minmax(300px, 420px) 1fr; gap: 16px; align-items: start; }
@media (max-width: 900px) { .pf-layout { grid-template-columns: 1fr; } }
.pf-form { display: grid; gap: 12px; max-height: 72vh; overflow-y: auto; padding-right: 4px; }
.pf-h { font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-2); margin-bottom: 8px; }
.pf-frame { width: 100%; height: 68vh; border: 1px solid var(--border); border-radius: 12px; background: #fff; }

/* ---------- chat ---------- */
.chat-box { display: flex; flex-direction: column; height: min(64vh, 560px); padding: 0; overflow: hidden; margin-bottom: 30px; }
.chat-messages { flex: 1; overflow-y: auto; padding: 18px; display: flex; flex-direction: column; gap: 12px; }
.msg { max-width: 82%; padding: 11px 15px; border-radius: 16px; font-size: 0.93rem; line-height: 1.55; white-space: pre-wrap; overflow-wrap: break-word; animation: view-in 0.25s ease; }
.msg.user { align-self: flex-end; background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; border-bottom-right-radius: 4px; }
.msg.ai { align-self: flex-start; background: var(--bg-2); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.msg.sys { align-self: center; background: transparent; color: var(--text-2); font-size: 0.78rem; }
.msg.typing::after { content: '▍'; animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: 0; } }
.chat-form { display: flex; gap: 10px; padding: 12px; border-top: 1px solid var(--border); }
.chat-captcha { padding: 12px 18px; border-top: 1px solid var(--border); }

/* ---------- chess ---------- */
.chess-layout { display: grid; grid-template-columns: minmax(280px, 560px) minmax(220px, 1fr); gap: 18px; align-items: start; }
.board-wrap { position: relative; user-select: none; -webkit-user-select: none; }
.chess-board {
  display: grid; grid-template-columns: repeat(8, 1fr); aspect-ratio: 1/1; width: 100%;
  border-radius: 10px; overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow);
  touch-action: manipulation;
}
.sq { position: relative; display: flex; align-items: center; justify-content: center; cursor: pointer; }
.sq.light { background: var(--board-light); }
.sq.dark { background: var(--board-dark); }
.sq img { width: 88%; height: 88%; pointer-events: none; }
.sq.sel::after, .sq.last::after {
  content: ''; position: absolute; inset: 0; background: rgba(255, 220, 80, 0.35);
}
.sq.hint::before {
  content: ''; position: absolute; width: 30%; height: 30%; border-radius: 50%;
  background: rgba(20, 30, 40, 0.35); z-index: 2;
}
.sq.hint.occ::before { width: 92%; height: 92%; background: transparent; border: 4px solid rgba(20,30,40,0.35); }
.sq.check::after { content: ''; position: absolute; inset: 0; background: radial-gradient(circle, rgba(255,60,60,0.7), transparent 70%); }
.sq .coord { position: absolute; font-size: 0.55rem; font-weight: 700; opacity: 0.6; pointer-events: none; }
.sq .coord.file { right: 3px; bottom: 2px; }
.sq .coord.rank { left: 3px; top: 2px; }
.chess-side { display: flex; flex-direction: column; gap: 12px; }
.chess-side .card { padding: 14px; }
.movelist {
  font-family: var(--mono); font-size: 0.84rem; line-height: 1.9; max-height: 220px; overflow-y: auto;
  display: grid; grid-template-columns: 2.2em 1fr 1fr; gap: 0 8px;
}
.movelist span.mv { cursor: default; padding: 0 4px; border-radius: 4px; }
.movelist span.mv.cur { background: var(--accent-glow); color: var(--accent); }
.movelist span.no { color: var(--text-2); }
.chess-status { font-weight: 600; }
.chess-toolbar { display: flex; flex-wrap: wrap; gap: 8px; }
.captured { font-size: 1.05rem; letter-spacing: 2px; min-height: 1.4em; }
.promo-modal {
  position: absolute; inset: 0; background: rgba(5, 8, 14, 0.65); z-index: 10;
  display: flex; align-items: center; justify-content: center; gap: 10px; border-radius: 10px;
}
.promo-modal button { width: 64px; height: 64px; border-radius: 12px; border: 1px solid var(--border); background: var(--card-solid); cursor: pointer; }
.promo-modal img { width: 85%; height: 85%; }
@media (max-width: 760px) {
  .chess-layout { grid-template-columns: 1fr; }
}

/* ---------- bottom nav ---------- */
.bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
  height: calc(var(--nav-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  display: grid; grid-template-columns: repeat(5, 1fr);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
}
.nav-item {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
  color: var(--text-2); font-size: 0.66rem; font-weight: 600; letter-spacing: 0.03em;
  transition: color 0.2s;
}
.nav-item:hover { text-decoration: none; }
.nav-item svg { width: 22px; height: 22px; }
.nav-item.active { color: var(--accent); }
.nav-item.active svg { filter: drop-shadow(0 0 8px var(--accent-glow)); }
.nav-home { transform: translateY(-14px); }
.nav-home-btn {
  width: 52px; height: 52px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; box-shadow: 0 6px 22px var(--accent-glow);
  border: 3px solid var(--bg);
  transition: transform 0.2s;
}
.nav-home:hover .nav-home-btn { transform: scale(1.07); }
.nav-home.active span:last-child { color: var(--accent); }
.nav-home svg { width: 24px; height: 24px; }

/* ---------- misc responsive ---------- */
@media (max-width: 560px) {
  .view-head h1 { font-size: 1.4rem; }
  .card-grid { grid-template-columns: 1fr 1fr; }
  .content-card p { display: none; }
  #posts-controls { display: block; }
}
@media (max-width: 380px) {
  .card-grid { grid-template-columns: 1fr; }
}
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }
::selection { background: var(--accent-glow); }