/* Solar System Explorer — NFR-104: desktop + mobile both first-class. */
:root {
  --bg: #04060d;
  --glass: rgba(13, 18, 32, 0.78);
  --glass-border: rgba(120, 150, 200, 0.16);
  --text: #dfe6f2;
  --text-dim: #8b96ab;
  --accent: #6ab7ff;
  --radius: 14px;
  --font: "Avenir Next", "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; height: 100%; overflow: hidden;
  background: var(--bg); color: var(--text);
  font-family: var(--font); font-size: 15px; line-height: 1.45;
}

#scene {
  position: fixed; inset: 0; width: 100%; height: 100%;
  display: block; touch-action: none; /* EC-8 */
  cursor: grab;
}
#scene.dragging { cursor: grabbing; }
#scene.hovering { cursor: pointer; }

/* ---------- fallback (EC-1) ---------- */
#fallback[hidden] { display: none; }
#fallback {
  position: fixed; inset: 0; z-index: 100; display: grid; place-items: center;
  background: radial-gradient(ellipse at center, #0a1024 0%, var(--bg) 70%);
  text-align: center; padding: 24px;
}
#fallback h1 { font-size: 1.6rem; margin-bottom: 0.4em; }
#fallback p { color: var(--text-dim); max-width: 42ch; }

/* ---------- first-run hint ---------- */
#hint {
  position: fixed; top: max(18px, env(safe-area-inset-top)); left: 50%;
  transform: translateX(-50%); z-index: 20;
  padding: 8px 18px; border-radius: 999px;
  background: var(--glass); border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  color: var(--text-dim); font-size: 0.85rem; letter-spacing: 0.02em;
  pointer-events: none; transition: opacity 0.8s ease;
}
#hint.hidden { opacity: 0; }

/* ---------- info panel (FR-032) ---------- */
#panel {
  position: fixed; z-index: 30;
  top: 0; right: 0; bottom: 0; width: min(370px, 92vw);
  padding: 22px 22px calc(90px + env(safe-area-inset-bottom));
  overflow-y: auto; overscroll-behavior: contain;
  background: var(--glass); border-left: 1px solid var(--glass-border);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  transform: translateX(105%); transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
#panel.open { transform: translateX(0); }

#panel .close {
  position: absolute; top: 10px; right: 12px;
  background: none; border: none; color: var(--text-dim);
  font-size: 1.7rem; line-height: 1; cursor: pointer; padding: 6px;
}
#panel .close:hover { color: var(--text); }

#panel .head { margin: 6px 0 14px; }
#panel .head h2 { margin: 0; font-size: 1.55rem; font-weight: 600; letter-spacing: 0.01em; display: flex; align-items: center; gap: 10px; }
#panel .head h2::before {
  content: ""; width: 12px; height: 12px; border-radius: 50%; flex: none;
  background: var(--accent); box-shadow: 0 0 10px var(--accent);
}
#panel .head .type { color: var(--text-dim); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.09em; }

#panel .desc {
  margin: 0 0 16px; font-size: 0.9rem; line-height: 1.6;
  color: #c3cbda;
}

#panel .live { display: grid; gap: 7px; margin-bottom: 16px; }
#panel .lv {
  display: flex; justify-content: space-between; gap: 12px; align-items: baseline;
  padding: 7px 10px; border-radius: 8px;
  background: rgba(106, 183, 255, 0.07); border: 1px solid rgba(106, 183, 255, 0.12);
  font-variant-numeric: tabular-nums;
}
#panel .lv span { color: var(--text-dim); font-size: 0.8rem; }
#panel .lv b { font-weight: 600; font-size: 0.88rem; white-space: nowrap; }

#panel .facts { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 14px; margin: 0 0 14px; }
#panel .facts > div { padding: 6px 0; border-bottom: 1px solid rgba(120, 150, 200, 0.09); }
#panel .facts dt { color: var(--text-dim); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.07em; }
#panel .facts dd { margin: 2px 0 0; font-size: 0.88rem; }

#panel .fun {
  padding: 12px 14px; border-radius: var(--radius);
  background: rgba(255, 200, 90, 0.08); border: 1px solid rgba(255, 200, 90, 0.16);
  font-size: 0.9rem;
}
#panel .cmp { color: var(--text-dim); font-style: italic; font-size: 0.85rem; }

#panel .chips { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 10px 0; }
#panel .chips > span { color: var(--text-dim); font-size: 0.78rem; margin-right: 2px; }
.chip {
  background: rgba(106, 183, 255, 0.12); border: 1px solid rgba(106, 183, 255, 0.25);
  color: var(--text); border-radius: 999px; padding: 4px 12px;
  font-size: 0.8rem; cursor: pointer; font-family: inherit;
}
.chip:hover { background: rgba(106, 183, 255, 0.25); }

/* ---------- toolbar ---------- */
#toolbar {
  position: fixed; z-index: 25; left: 50%; transform: translateX(-50%);
  bottom: max(14px, env(safe-area-inset-bottom));
  display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; justify-content: center;
  max-width: min(1060px, calc(100vw - 20px));
  padding: 10px 16px; border-radius: 18px;
  background: var(--glass); border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
}
.tgroup { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; justify-content: center; }

#toolbar button {
  background: rgba(120, 150, 200, 0.1); border: 1px solid var(--glass-border);
  color: var(--text); border-radius: 9px; padding: 7px 12px;
  font-family: inherit; font-size: 0.85rem; cursor: pointer;
  transition: background 0.15s ease;
}
#toolbar button:hover { background: rgba(120, 150, 200, 0.22); }
#toolbar button[aria-pressed="true"] { background: rgba(106, 183, 255, 0.22); border-color: rgba(106, 183, 255, 0.4); }

#speedSlider { width: 150px; accent-color: var(--accent); }
.readout { color: var(--text-dim); font-size: 0.8rem; font-variant-numeric: tabular-nums; min-width: 64px; text-align: center; }
.readout.date { color: var(--text); font-size: 0.86rem; }

#datePicker, #search {
  background: rgba(120, 150, 200, 0.1); border: 1px solid var(--glass-border);
  color: var(--text); border-radius: 9px; padding: 6px 10px;
  font-family: inherit; font-size: 0.82rem;
  color-scheme: dark;
}
#search { width: 170px; }

/* ---------- toast + tooltip ---------- */
#toast {
  position: fixed; z-index: 40; left: 50%; transform: translateX(-50%) translateY(-8px);
  top: max(64px, calc(env(safe-area-inset-top) + 50px));
  max-width: min(480px, 90vw);
  padding: 11px 20px; border-radius: 12px;
  background: rgba(20, 28, 48, 0.92); border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  font-size: 0.88rem; text-align: center;
  opacity: 0; pointer-events: none; transition: opacity 0.3s ease, transform 0.3s ease;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

#tooltip {
  position: fixed; z-index: 35; pointer-events: none;
  padding: 4px 11px; border-radius: 8px;
  background: rgba(20, 28, 48, 0.92); border: 1px solid var(--glass-border);
  font-size: 0.82rem; white-space: nowrap;
}

/* ---------- 3D labels (FR-034) ---------- */
.body-label {
  color: var(--text); font-family: var(--font); font-size: 11.5px;
  letter-spacing: 0.06em; text-shadow: 0 1px 4px rgba(0, 0, 0, 0.9);
  padding: 1px 6px; cursor: pointer; user-select: none;
  transition: opacity 0.2s ease;
}
.body-label.dim { color: var(--text-dim); font-size: 10.5px; }

/* ---------- simulation banner ---------- */
#simBanner[hidden] { display: none; }
#simBanner {
  position: fixed; z-index: 28; left: 50%; transform: translateX(-50%);
  top: max(14px, env(safe-area-inset-top));
  display: flex; gap: 10px; align-items: center;
  padding: 8px 14px; border-radius: 12px;
  background: rgba(48, 30, 8, 0.88); border: 1px solid rgba(255, 176, 64, 0.45);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  font-size: 0.86rem; font-variant-numeric: tabular-nums;
}
#simBanner .flask { font-size: 1rem; }
#simExitBtn {
  background: rgba(255, 176, 64, 0.16); border: 1px solid rgba(255, 176, 64, 0.4);
  color: var(--text); border-radius: 8px; padding: 4px 11px;
  font-family: inherit; font-size: 0.8rem; cursor: pointer;
}
#simExitBtn:hover { background: rgba(255, 176, 64, 0.3); }

/* ---------- attribution ---------- */
#attribution {
  position: fixed; z-index: 15; right: 10px; top: max(8px, env(safe-area-inset-top));
  font-size: 0.68rem; color: rgba(139, 150, 171, 0.75);
}
#attribution a { color: rgba(139, 150, 171, 0.95); }

/* ---------- mobile: panel becomes a bottom sheet ---------- */
@media (max-width: 720px) {
  #panel {
    top: auto; left: 0; right: 0; width: 100%;
    max-height: 52vh; border-left: none; border-top: 1px solid var(--glass-border);
    border-radius: 18px 18px 0 0;
    padding: 18px 18px calc(96px + env(safe-area-inset-bottom));
    transform: translateY(110%);
  }
  #panel.open { transform: translateY(0); }
  #toolbar { padding: 8px 10px; gap: 6px 8px; }
  #speedSlider { width: 110px; }
  #search { width: 130px; }
  .readout.date { font-size: 0.78rem; }
  #attribution { display: none; }
  #panel .facts { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  #panel, #toast, #hint { transition: none; }
}