/* ============================================================================
   Regolith Highfield — shared UI for the SONA suite.
   Dark, neon-accented, soft-shadow (neumorphic) panels. Segoe system stack.
   Variables let any module re-skin without touching component rules.
   ============================================================================ */
:root {
  --bg: #0a0a12;
  --bg-2: #11121d;
  --panel: #141527;
  --panel-2: #1a1c30;
  --ink: #ffffff;
  --ink-dim: #9aa0b5;
  --ink-faint: #6b7185;
  --line: #25283f;
  --accent: #7b5cff;   /* Regolith purple */
  --cyan: #00f0ff;
  --pink: #ff3a8c;
  --yellow: #ffd400;
  --green: #3bff9e;
  --orange: #ff5e3a;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-out: 6px 6px 14px #05050b, -6px -6px 14px #15172b;
  --shadow-in: inset 4px 4px 9px #05050b, inset -4px -4px 9px #15172b;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background:
    radial-gradient(1200px 700px at 15% -10%, #181a33 0%, transparent 60%),
    radial-gradient(900px 600px at 110% 10%, #1a1330 0%, transparent 55%),
    var(--bg);
  color: var(--ink);
  min-height: 100vh;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- top bar / brand --------------------------------------------------- */
.r-top {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(20,21,39,.75), rgba(10,10,18,.4));
  position: sticky; top: 0; z-index: 50; backdrop-filter: blur(8px);
}
.r-logo {
  font-weight: 800; letter-spacing: 2px; font-size: 20px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  cursor: default; user-select: none;
}
.r-logo b { font-weight: 800; }
.r-sub { color: var(--ink-dim); font-size: 13px; }
.r-eco {
  margin-left: auto; font-size: 11px; color: var(--ink-faint);
  border: 1px solid var(--line); padding: 4px 10px; border-radius: 999px;
}
.r-eco b { color: var(--accent); }

/* --- layout ------------------------------------------------------------ */
.r-wrap { max-width: 1140px; margin: 0 auto; padding: 22px; }
.r-grid { display: grid; gap: 18px; }
.cols-2 { grid-template-columns: 1fr 1fr; }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 820px) { .cols-2, .cols-3 { grid-template-columns: 1fr; } }

/* --- panels ------------------------------------------------------------ */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-out);
  padding: 18px;
}
.panel h2 { margin: 0 0 4px; font-size: 15px; letter-spacing: .3px; }
.panel .hint { color: var(--ink-dim); font-size: 12.5px; margin: 0 0 14px; }

/* --- tabs -------------------------------------------------------------- */
.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.tab {
  border: 1px solid var(--line); background: var(--panel);
  color: var(--ink-dim); border-radius: 999px; padding: 8px 16px;
  cursor: pointer; font-size: 13px; font-weight: 600;
  box-shadow: var(--shadow-out); transition: .15s;
}
.tab:hover { color: var(--ink); }
.tab.active { color: #08070f; background: linear-gradient(90deg, var(--accent), var(--cyan)); border-color: transparent; }
.tabpage { display: none; }
.tabpage.active { display: block; }

/* --- mode cards (the two strade) -------------------------------------- */
.modecards { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 640px) { .modecards { grid-template-columns: 1fr; } }
.modecard {
  border: 1.5px solid var(--line); border-radius: var(--radius);
  background: var(--panel-2); padding: 16px; cursor: pointer; transition: .15s;
  box-shadow: var(--shadow-out);
}
.modecard:hover { transform: translateY(-2px); }
.modecard.sel { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), var(--shadow-out); }
.modecard .ic { font-size: 26px; }
.modecard h3 { margin: 8px 0 4px; font-size: 15px; }
.modecard p { margin: 0; color: var(--ink-dim); font-size: 12.5px; }
.modecard .tagline { margin-top: 8px; font-size: 11px; color: var(--accent); }

/* --- controls ---------------------------------------------------------- */
.field { margin-bottom: 14px; }
.field > label { display: block; font-size: 12px; color: var(--ink-dim); margin-bottom: 6px; font-weight: 600; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
select, input[type=text], input[type=number] {
  width: 100%; background: var(--bg-2); color: var(--ink);
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 9px 11px; font-family: var(--font); font-size: 13px; box-shadow: var(--shadow-in);
}
input[type=range] { width: 100%; accent-color: var(--accent); }
.rangewrap { display: flex; align-items: center; gap: 10px; }
.rangewrap output { min-width: 48px; text-align: right; font-variant-numeric: tabular-nums; color: var(--cyan); font-size: 12px; }

.btn {
  border: none; cursor: pointer; border-radius: var(--radius-sm);
  padding: 11px 18px; font-weight: 700; font-size: 13.5px; font-family: var(--font);
  background: var(--panel-2); color: var(--ink); box-shadow: var(--shadow-out); transition: .12s;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { box-shadow: var(--shadow-in); transform: none; }
.btn:disabled { opacity: .4; cursor: not-allowed; transform: none; }
.btn.primary { background: linear-gradient(90deg, var(--accent), var(--cyan)); color: #08070f; }
.btn.ghost { background: transparent; border: 1px solid var(--line); }
.btn.play { background: linear-gradient(90deg, var(--green), var(--cyan)); color: #042018; }
.btn.stop { background: linear-gradient(90deg, var(--pink), var(--orange)); color: #2a0512; }
.btn.sm { padding: 7px 12px; font-size: 12px; }

/* --- dropzone ---------------------------------------------------------- */
.drop {
  border: 2px dashed var(--line); border-radius: var(--radius);
  padding: 26px; text-align: center; color: var(--ink-dim);
  background: var(--bg-2); cursor: pointer; transition: .15s;
}
.drop.over { border-color: var(--cyan); color: var(--ink); background: #10131f; }
.drop b { color: var(--ink); }
.drop small { display: block; margin-top: 6px; color: var(--ink-faint); }

/* --- transport / viz --------------------------------------------------- */
.transport { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.viz { width: 100%; height: 150px; background: #06070f; border-radius: var(--radius-sm); border: 1px solid var(--line); display: block; }
.meta { font-size: 12px; color: var(--ink-dim); }
.badge { display: inline-block; font-size: 11px; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--ink-dim); }
.badge.ok { color: var(--green); border-color: #1c3b2c; }
.kv { display: flex; gap: 6px; flex-wrap: wrap; }
.kv span { background: var(--bg-2); border: 1px solid var(--line); border-radius: 8px; padding: 3px 9px; font-size: 11.5px; color: var(--ink-dim); }
.kv b { color: var(--cyan); }

/* --- collapsible (Maeda: hide depth until asked) ----------------------- */
.adv > summary { cursor: pointer; color: var(--ink-dim); font-size: 12.5px; font-weight: 600; list-style: none; padding: 6px 0; }
.adv > summary::-webkit-details-marker { display: none; }
.adv > summary::before { content: "▸ "; color: var(--accent); }
.adv[open] > summary::before { content: "▾ "; }

/* --- help steps -------------------------------------------------------- */
.steps { counter-reset: s; display: grid; gap: 10px; }
.steps .step { display: flex; gap: 12px; align-items: flex-start; }
.steps .step::before { counter-increment: s; content: counter(s); flex: 0 0 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; background: var(--panel-2); color: var(--cyan); font-weight: 700; box-shadow: var(--shadow-out); }
.steps .step div b { color: var(--ink); }
.steps .step div { color: var(--ink-dim); font-size: 13px; }

.toast { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); background: var(--panel-2); border: 1px solid var(--line); color: var(--ink); padding: 10px 16px; border-radius: 999px; box-shadow: var(--shadow-out); font-size: 13px; opacity: 0; pointer-events: none; transition: .25s; z-index: 100; }
.toast.show { opacity: 1; bottom: 28px; }

.foot { color: var(--ink-faint); font-size: 11.5px; text-align: center; padding: 26px 0 10px; }
.foot a { color: var(--ink-dim); }