/* ─────────────────────────────────────────────────────────────────────────────
   IFA AP Playground — styles.css
   toe.cenproject.org/ifa-number/ap-playground/
───────────────────────────────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:      #050810;
  --bg2:     #070e1b;
  --bg3:     #0b1528;
  --card:    rgba(255,255,255,0.035);
  --card-h:  rgba(255,255,255,0.065);
  --br:      rgba(255,255,255,0.08);
  --t1:      #eef1fb;
  --t2:      #8892aa;
  --t3:      #50586a;
  --amber:   #f0920c;
  --cyan:    #14b8d4;
  --indigo:  #6366f1;
  --green:   #4caf50;
  --purple:  #8b5cf6;
  --pink:    #ec4899;
  --yellow:  #fbbf24;
  --ff: 'Inter', system-ui, sans-serif;
  --fm: 'Space Mono', monospace;
}

html  { scroll-behavior: smooth; }
body  { background: var(--bg); color: var(--t1); font-family: var(--ff); line-height: 1.6; overflow-x: hidden; }
a     { color: var(--amber); text-decoration: none; }
strong { font-weight: 700; }

/* ── Top bar ──────────────────────────────────────────────────────────────── */
.app-bar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(5,8,16,0.9); backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--br);
  display: flex; align-items: center; gap: 16px; padding: 0 1.5rem; height: 50px;
}
.app-bar__back {
  font-size: 0.78rem; color: var(--t2); border: 1px solid var(--br);
  border-radius: 4px; padding: 3px 10px; transition: color 0.12s, border-color 0.12s;
}
.app-bar__back:hover { color: var(--t1); border-color: rgba(255,255,255,0.2); text-decoration: none; }
.app-bar__title {
  font-family: var(--fm); font-size: 0.8rem; color: var(--t1);
  font-weight: 700; letter-spacing: 0.04em;
}
.app-bar__sub { font-size: 0.72rem; color: var(--t3); margin-left: 4px; }

/* ── Root layout ────────────────────────────────────────────────────────── */
.app-root { display: flex; flex-direction: column; min-height: 100vh; }
.app-main {
  flex: 1; display: grid;
  grid-template-columns: 300px 1fr 260px;
  grid-template-rows: auto 1fr;
  gap: 0;
  max-width: 1440px; margin: 0 auto; width: 100%;
  padding: 0;
}
@media (max-width: 1024px) {
  .app-main { grid-template-columns: 1fr; }
}

/* ── Header row ───────────────────────────────────────────────────────────── */
.app-header {
  grid-column: 1/-1; padding: 32px 24px 24px;
  border-bottom: 1px solid var(--br);
}
.app-header__eyebrow {
  font-family: var(--fm); font-size: 0.65rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--cyan); margin-bottom: 8px;
}
.app-header__title {
  font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 800; margin-bottom: 6px;
}
.app-header__body { font-size: 0.88rem; color: var(--t2); max-width: 700px; }

/* ── Left panel: AP selector ─────────────────────────────────────────────── */
.panel-left {
  border-right: 1px solid var(--br);
  padding: 20px 0; overflow-y: auto;
  max-height: calc(100vh - 50px);
  position: sticky; top: 50px;
}
.panel-left__group-label {
  font-family: var(--fm); font-size: 0.62rem; text-transform: uppercase;
  letter-spacing: 0.14em; color: var(--t3); padding: 8px 20px 6px;
}
.ap-btn {
  display: flex; align-items: flex-start; gap: 12px; width: 100%;
  padding: 11px 20px; border: none; background: transparent;
  cursor: pointer; transition: background 0.12s; text-align: left;
  border-bottom: 1px solid var(--br);
}
.ap-btn:hover { background: var(--card); }
.ap-btn--active { background: var(--card-h) !important; }
.ap-btn__dot {
  width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; margin-top: 4px;
}
.ap-btn__info { flex: 1; min-width: 0; }
.ap-btn__name { font-size: 0.8rem; font-weight: 600; color: var(--t1); margin-bottom: 2px; }
.ap-btn__meta { font-size: 0.7rem; color: var(--t3); font-family: var(--fm); }
.ap-btn--active .ap-btn__name { color: var(--t1); }

/* ── Center panel: grid + sequence ──────────────────────────────────────── */
.panel-center {
  padding: 24px; overflow-y: auto;
}

.grid-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 14px; flex-wrap: wrap; gap: 8px;
}
.grid-header__title { font-size: 0.85rem; font-weight: 600; color: var(--t1); }
.grid-header__sub   { font-size: 0.72rem; color: var(--t3); }

/* Mini 16x16 grid */
.mini-grid {
  display: grid; grid-template-columns: repeat(16, 1fr);
  gap: 2px; margin-bottom: 28px;
  border: 1px solid var(--br); border-radius: 8px; padding: 10px;
  background: var(--bg2);
}
.mini-cell {
  aspect-ratio: 1; border-radius: 3px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.04);
  transition: all 0.2s; cursor: default;
  display: flex; align-items: center; justify-content: center;
  font-size: 0; /* number hidden by default */
  position: relative;
}
.mini-cell--active {
  border-width: 1px;
}
.mini-cell--active.mini-cell--bright {
  box-shadow: 0 0 6px var(--cell-color, #f0920c);
}
.mini-cell:hover { z-index: 2; }
.mini-cell__tip {
  display: none; position: absolute; bottom: calc(100% + 4px); left: 50%;
  transform: translateX(-50%); white-space: nowrap; font-size: 0.62rem;
  background: var(--bg3); border: 1px solid var(--br);
  border-radius: 4px; padding: 2px 6px; color: var(--t1); font-family: var(--fm);
  pointer-events: none; z-index: 10;
}
.mini-cell:hover .mini-cell__tip { display: block; }

/* Axis labels */
.grid-axis-row {
  display: flex; gap: 2px; margin-bottom: 4px; padding: 0 10px;
}
.grid-axis-col {
  display: flex; flex-direction: column; gap: 2px; margin-right: 4px; padding: 10px 0;
}
.grid-axis-label {
  font-family: var(--fm); font-size: 0.45rem; color: var(--t3);
  text-align: center; flex: 1;
}

/* Sequence display */
.seq-label { font-size: 0.72rem; font-weight: 600; color: var(--t2); margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.08em; font-family: var(--fm); }
.seq-terms {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px;
}
.seq-term {
  font-family: var(--fm); font-size: 0.82rem; font-weight: 700;
  padding: 6px 10px; border-radius: 6px;
  border: 1px solid; transition: transform 0.1s;
  min-width: 38px; text-align: center;
}
.seq-term:hover { transform: scale(1.08); }

/* ── Right panel: properties ─────────────────────────────────────────────── */
.panel-right {
  border-left: 1px solid var(--br); padding: 24px 20px;
  overflow-y: auto; max-height: calc(100vh - 50px);
  position: sticky; top: 50px;
}
.props-title { font-size: 0.78rem; font-weight: 700; color: var(--t1); margin-bottom: 18px; text-transform: uppercase; letter-spacing: 0.08em; font-family: var(--fm); }
.prop-row { margin-bottom: 18px; }
.prop-key  { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--t3); margin-bottom: 4px; font-family: var(--fm); }
.prop-val  { font-size: 1.1rem; font-weight: 700; font-family: var(--fm); }
.prop-val--sm { font-size: 0.88rem; }
.prop-formula {
  font-family: var(--fm); font-size: 0.82rem;
  background: var(--bg3); border: 1px solid var(--br);
  border-radius: 6px; padding: 10px 12px; color: var(--t1);
  margin-top: 8px; line-height: 1.7;
}
.prop-desc  {
  font-size: 0.8rem; color: var(--t2); line-height: 1.6;
  background: var(--card); border-radius: 6px; padding: 12px;
  margin-top: 8px; border: 1px solid var(--br);
}

.prop-divider { border: none; border-top: 1px solid var(--br); margin: 20px 0; }

/* ── Empty state ─────────────────────────────────────────────────────────── */
.empty-state {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; padding: 60px 20px; color: var(--t3);
  text-align: center;
}
.empty-state__icon { font-size: 2.5rem; margin-bottom: 16px; opacity: 0.4; }
.empty-state__text { font-size: 0.88rem; }

/* ── Scrollbar ────────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }

@media (max-width: 1024px) {
  .panel-left, .panel-right { max-height: none; position: static; border: none; border-bottom: 1px solid var(--br); }
  .panel-left { overflow-y: visible; }
  .panel-left { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
  .panel-left__group-label { grid-column: 1/-1; }
}

/* ══ MOBILE ────────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {

  /* Top bar */
  .app-bar { padding: 0 0.875rem; gap: 10px; }
  .app-bar__title { font-size: 0.74rem; }
  .app-bar__sub { display: none; }

  /* Header */
  .app-header { padding: 20px 14px 16px; }
  .app-header__title { font-size: clamp(1.1rem, 4vw, 1.5rem); }
  .app-header__body { font-size: 0.82rem; }

  /* AP selector: 2-col grid on medium mobile */
  .panel-left { grid-template-columns: repeat(auto-fill, minmax(155px, 1fr)); padding: 10px 0; }
  .ap-btn { padding: 9px 14px; gap: 10px; }
  .ap-btn__name { font-size: 0.76rem; }
  .ap-btn__meta { font-size: 0.66rem; }

  /* Center panel */
  .panel-center { padding: 16px 12px; }
  .grid-header { margin-bottom: 10px; }
  .grid-header__title { font-size: 0.8rem; }

  /* Mini grid: let it scroll horizontally rather than squish */
  .mini-grid-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0 -12px;
    padding: 0 12px;
  }
  .mini-grid {
    min-width: 260px;
    gap: 1.5px;
    padding: 8px;
  }

  /* Sequence terms */
  .seq-terms { gap: 6px; }
  .seq-term { font-size: 0.76rem; padding: 5px 8px; min-width: 30px; }

  /* Right panel */
  .panel-right { padding: 16px 14px; }
  .prop-val { font-size: 1rem; }
}

@media (max-width: 480px) {
  .panel-left { grid-template-columns: 1fr 1fr; }
  .app-bar__back { font-size: 0.72rem; padding: 3px 8px; }
  .mini-grid { gap: 1px; padding: 6px; }
}