/* Scienki web — the Mac app's night-observatory theme. No greens anywhere (user rule). */
:root {
  --ground: #090b15; --ground-top: #111222; --panel: #161829; --panel-hi: #1e2136;
  --stroke: rgba(255,255,255,.075); --text: #f1efe9; --dim: #a7aabd; --faint: #6b6f87;
  --again: #ff6b70; --hard: #f7a838; --good: #54a8ff; --easy: #b88fff; --brand: #8c80ff;
  --ui: Futura, "Jost", "Avenir Next", system-ui, sans-serif;
  --body: "Avenir Next", "Jost", system-ui, sans-serif;
  --serif: Charter, "Bitstream Charter", "Source Serif 4", Georgia, serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { background: linear-gradient(var(--ground-top), var(--ground) 420px) fixed, var(--ground); color: var(--text);
       font: 15px/1.5 var(--body); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
.boot { display: grid; place-items: center; height: 100vh; color: var(--dim); font-family: var(--ui); }

/* layout */
.shell { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; }
.side { border-right: 1px solid var(--stroke); padding: 22px 14px; position: sticky; top: 0; height: 100vh; display: flex; flex-direction: column; gap: 4px; }
.logo { display: flex; align-items: center; gap: 10px; font: 600 22px/1 var(--ui); letter-spacing: .3px; padding: 0 8px 18px; }
.logo img { width: 34px; height: 34px; margin: -3px; }
.nav a { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-radius: 10px; color: var(--text); font: 500 15px var(--ui); }
.nav a:hover { background: rgba(255,255,255,.04); }
.nav a.on { background: var(--panel-hi); }
.nav .ico { width: 18px; text-align: center; color: var(--dim); }
.side .grow { flex: 1; }
.side .who { font: 13px var(--ui); color: var(--dim); padding: 8px 12px; }
.main { padding: 34px 48px 80px; max-width: 1120px; width: 100%; }
.mobile-top { display: none; }
@media (max-width: 820px) {
  .shell { grid-template-columns: 1fr; }
  .side { position: static; height: auto; flex-direction: row; flex-wrap: wrap; padding: 10px 16px; border-right: 0; border-bottom: 1px solid var(--stroke); }
  .logo { padding: 0 8px 0 0; width: 100%; } .side .grow, .side .who { display: none; }
  .nav a { padding: 6px 10px; }
  .main { padding: 22px 16px 60px; }
}

/* type */
h1 { font: 600 34px/1.15 var(--ui); margin: 0 0 6px; letter-spacing: .2px; }
h2 { font: 600 22px/1.25 var(--ui); margin: 30px 0 12px; }
h3 { font: 600 17px/1.3 var(--ui); margin: 0 0 6px; }
.sub { color: var(--dim); margin: 0 0 22px; }
.eyebrow { font: 700 11px var(--ui); letter-spacing: 1.6px; text-transform: uppercase; color: var(--dim); }
.serif { font-family: var(--serif); }

/* panels and controls */
.panel { background: var(--panel); border: 1px solid var(--stroke); border-radius: 16px; padding: 18px; }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.tiles { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); margin-bottom: 18px; }
.tile .v { font: 600 26px var(--ui); } .tile .k { font: 12px var(--ui); color: var(--dim); }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border-radius: 999px; border: 1px solid var(--stroke);
       background: var(--panel-hi); font: 600 14px var(--ui); }
.btn:hover { filter: brightness(1.15); }
.btn.primary { background: var(--accent, var(--brand)); border-color: transparent; color: #0b0c16; }
.btn.ghost { background: transparent; }
.btn[disabled] { opacity: .45; cursor: default; filter: none; }
.chip { display: inline-block; padding: 3px 10px; border-radius: 999px; font: 700 11px var(--ui); letter-spacing: 1px; text-transform: uppercase;
        color: var(--accent, var(--brand)); background: color-mix(in srgb, var(--accent, var(--brand)) 15%, transparent);
        border: 1px solid color-mix(in srgb, var(--accent, var(--brand)) 40%, transparent); }
.bar { height: 6px; border-radius: 99px; background: rgba(255,255,255,.07); overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--accent, var(--brand)); border-radius: 99px; }
input[type=email], input[type=password], input[type=text] { width: 100%; padding: 11px 14px; border-radius: 12px; border: 1px solid var(--stroke);
       background: var(--panel-hi); color: var(--text); font: 15px var(--body); }
input:focus { outline: 2px solid color-mix(in srgb, var(--brand) 60%, transparent); }
.msg { margin-top: 12px; color: var(--dim); font-size: 14px; } .msg.err { color: var(--again); }

/* subject cards */
.subject { display: block; border-radius: 16px; padding: 18px; background: var(--panel); border: 1px solid var(--stroke); position: relative; overflow: hidden; }
.subject::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 3px; background: var(--accent); }
.subject:hover { background: var(--panel-hi); }
.subject .meta { font: 12px var(--ui); color: var(--dim); margin: 2px 0 12px; }
.pick { cursor: pointer; }
.pick.on { border-color: color-mix(in srgb, var(--accent) 65%, transparent); background: color-mix(in srgb, var(--accent) 10%, var(--panel)); }
.pick .tick { position: absolute; top: 14px; right: 14px; width: 22px; height: 22px; border-radius: 50%; border: 1.5px solid var(--stroke); display: grid; place-items: center; font-size: 13px; }
.pick.on .tick { background: var(--accent); border-color: transparent; color: #0b0c16; }

/* course and lesson lists */
.module { margin-bottom: 14px; }
.module summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: 12px; }
.module summary::-webkit-details-marker { display: none; }
.module .num { font: 700 12px var(--ui); color: var(--accent); width: 34px; }
.lessons { margin-top: 12px; display: grid; gap: 4px; }
.lrow { display: flex; align-items: center; gap: 12px; padding: 8px 10px; border-radius: 10px; }
.lrow:hover { background: rgba(255,255,255,.035); }
.lrow .dot { width: 9px; height: 9px; border-radius: 50%; border: 1.5px solid var(--faint); flex: none; }
.lrow .dot.read { background: var(--accent); border-color: var(--accent); }
.lrow .t { flex: 1; } .lrow .m { font: 12px var(--ui); color: var(--faint); }

/* lesson reader */
.reader { max-width: 760px; }
.reader p, .reader li { font: 18px/1.65 var(--serif); }
.reader h2 { font-size: 21px; }
.box { border-radius: 14px; padding: 16px 18px; margin: 18px 0; background: var(--panel); border: 1px solid var(--stroke); }
.box.why { border-color: color-mix(in srgb, var(--hard) 45%, transparent); background: color-mix(in srgb, var(--hard) 7%, var(--panel)); }
.box.obj { border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.box p, .box li { font: 15.5px/1.6 var(--body); margin: 6px 0; }
details.dive { margin: 10px 0; } details.dive summary { cursor: pointer; font: 600 15px var(--ui); }
.gloss dt { font: 600 15px var(--ui); margin-top: 10px; } .gloss dd { margin: 2px 0 0; color: var(--dim); }
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 26px; }
.toast { position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%); padding: 10px 18px; border-radius: 999px; background: var(--panel-hi);
         border: 1px solid color-mix(in srgb, var(--good) 60%, transparent); font: 600 14px var(--ui); z-index: 10; }

/* quiz */
.q { font: 600 20px/1.4 var(--serif); margin: 8px 0 18px; }
.choice { display: block; width: 100%; text-align: left; padding: 12px 14px; margin: 8px 0; border-radius: 12px; border: 1px solid var(--stroke);
          background: rgba(255,255,255,.035); font: 15px var(--body); }
.choice.pick { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.choice.right { border-color: var(--good); background: color-mix(in srgb, var(--good) 13%, transparent); }
.choice.wrong { border-color: var(--again); background: color-mix(in srgb, var(--again) 13%, transparent); }
.why { margin-top: 14px; }

/* universe (Today): a port of the Mac app's Constellation */
.universe { position: relative; height: 460px; padding: 0; overflow: hidden; }
.u-label { position: absolute; top: 18px; left: 18px; font: 600 10.5px var(--ui); letter-spacing: 1.4px; color: var(--faint); }
.orbits { position: absolute; inset: 0; width: 100%; height: 100%; }
.orbits ellipse { fill: none; stroke: rgba(255,255,255,.1); stroke-width: 1; stroke-dasharray: 2 5; }
.core { position: absolute; left: 50%; top: calc(50% - 4px); width: 62px; height: 62px; transform: translate(-50%, -50%); display: grid; place-items: center; }
.core .glow { position: absolute; width: 120px; height: 120px; border-radius: 50%; background: radial-gradient(circle, color-mix(in srgb, var(--brand) 50%, transparent), transparent 60%); }
.core .ring { position: absolute; inset: 0; }
.core .pct { position: relative; display: flex; flex-direction: column; align-items: center; line-height: 1.05; }
.core b { font: 700 15px var(--ui); font-variant-numeric: tabular-nums; } .core span { font: 9px var(--ui); color: var(--dim); }
.planet { position: absolute; left: 0; top: 0; display: flex; flex-direction: column; align-items: center; gap: 5px; will-change: transform; }
.planet .body { position: relative; width: var(--size); height: var(--size); display: grid; place-items: center; transition: transform .3s cubic-bezier(.3,1.6,.5,1); }
.planet:hover .body { transform: scale(1.12); }
.planet .halo { position: absolute; width: calc(var(--size) + 16px); height: calc(var(--size) + 16px); border-radius: 50%; background: color-mix(in srgb, var(--c) 16%, transparent); filter: blur(9px); }
.planet .ball { position: absolute; width: calc(var(--size) * .74); height: calc(var(--size) * .74); border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, color-mix(in srgb, var(--c) 95%, transparent), color-mix(in srgb, var(--c) 35%, transparent) 70%); }
.planet .ico { position: absolute; width: calc(var(--size) * .4); height: calc(var(--size) * .4); background: rgba(13,13,28,.82);
  -webkit-mask-repeat: no-repeat; mask-repeat: no-repeat; -webkit-mask-size: contain; mask-size: contain; -webkit-mask-position: center; mask-position: center; }
.planet .ring { position: absolute; inset: 0; }
.planet .name { font: 500 10.5px var(--ui); color: var(--dim); white-space: nowrap; }
.planet:hover .name { font-weight: 700; color: var(--text); }
.rank { display: flex; align-items: center; gap: 14px; }
.rank .bar { flex: 1; }
.auth { max-width: 420px; }
.auth form { display: grid; gap: 10px; }
.tabs { display: flex; gap: 6px; margin-bottom: 14px; }
.tabs button { padding: 6px 14px; border-radius: 999px; border: 1px solid var(--stroke); background: transparent; font: 600 13px var(--ui); color: var(--dim); }
.tabs button.on { background: var(--panel-hi); color: var(--text); }