/* NEXUS Engine — Mobile-First UI */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

:root {
  --bg: #04121e;
  --panel: rgba(8, 22, 36, 0.92);
  --accent: #19d3ff;
  --accent2: #b44bff;
  --text: #d9ecf7;
  --dim: #6e8ba3;
}

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', Tahoma, system-ui, sans-serif;
  overscroll-behavior: none;
  position: fixed;
  inset: 0;
}

#engine-canvas {
  position: fixed; inset: 0;
  width: 100%; height: 100%;
  display: block;
}

/* ---------- شاشة التحميل ---------- */
#loader {
  position: fixed; inset: 0; z-index: 100;
  background: var(--bg);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 18px;
  transition: opacity 0.5s, visibility 0.5s;
}
#loader.hidden { opacity: 0; visibility: hidden; }
.loader-logo {
  width: 64px; height: 64px;
  border: 3px solid transparent;
  border-top-color: var(--accent);
  border-right-color: var(--accent2);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loader-title { font-size: 22px; font-weight: 800; letter-spacing: 2px; color: var(--accent); }
.loader-text { font-size: 13px; color: var(--dim); }

/* ---------- الشريط العلوي ---------- */
#topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: calc(env(safe-area-inset-top, 0px) + 8px) 12px 8px;
  background: linear-gradient(to bottom, rgba(4,18,30,0.85), transparent);
  pointer-events: none;
}
#topbar > * { pointer-events: auto; }
.brand {
  font-weight: 800; font-size: 15px; letter-spacing: 1.5px;
  color: var(--accent);
  display: flex; align-items: center; gap: 6px;
}
.brand .hex { color: var(--accent2); font-size: 17px; }
.brand small { color: var(--dim); font-weight: 400; font-size: 10px; letter-spacing: 0; }

#stats {
  display: flex; gap: 10px;
  font-size: 10px; color: var(--dim);
  font-variant-numeric: tabular-nums;
  background: rgba(8,22,36,0.6);
  padding: 4px 10px; border-radius: 20px;
  backdrop-filter: blur(8px);
}
#stats b { color: var(--accent); font-size: 12px; display: block; text-align: center; }

/* ---------- أزرار عائمة ---------- */
#fabs {
  position: fixed; z-index: 20;
  bottom: calc(env(safe-area-inset-bottom, 0px) + 16px);
  right: 12px;
  display: flex; flex-direction: column; gap: 10px;
}
.fab {
  width: 48px; height: 48px; border-radius: 50%;
  border: 1px solid rgba(25,211,255,0.35);
  background: var(--panel);
  color: var(--text); font-size: 19px;
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(10px);
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
  transition: transform 0.15s;
}
.fab:active { transform: scale(0.9); }
.fab-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #04121e; font-weight: 800;
  border: none;
  box-shadow: 0 4px 20px rgba(25,211,255,0.45);
}

/* ---------- لوحة الذكاء الاصطناعي ---------- */
#ai-panel {
  position: fixed; z-index: 30;
  left: 0; right: 0; bottom: 0;
  max-height: 72vh;
  background: var(--panel);
  backdrop-filter: blur(16px);
  border-radius: 20px 20px 0 0;
  border-top: 1px solid rgba(25,211,255,0.3);
  transform: translateY(105%);
  transition: transform 0.32s cubic-bezier(0.2, 0.9, 0.3, 1);
  display: flex; flex-direction: column;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
#ai-panel.open { transform: translateY(0); }

.panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px 10px;
}
.panel-title { font-size: 14px; font-weight: 700; color: var(--accent); display: flex; align-items: center; gap: 8px; }
#ai-busy {
  display: none;
  width: 14px; height: 14px;
  border: 2px solid transparent; border-top-color: var(--accent2);
  border-radius: 50%; animation: spin 0.7s linear infinite;
}
#panel-close { background: none; border: none; color: var(--dim); font-size: 22px; cursor: pointer; padding: 4px 8px; }

.blueprints {
  display: flex; gap: 8px; padding: 0 16px 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.bp-btn {
  flex-shrink: 0;
  padding: 8px 14px;
  border-radius: 20px;
  border: 1px solid rgba(180,75,255,0.4);
  background: rgba(180,75,255,0.12);
  color: var(--text); font-size: 12.5px;
  cursor: pointer;
  transition: background 0.15s;
}
.bp-btn:active { background: rgba(180,75,255,0.3); }

#ai-log {
  flex: 1;
  overflow-y: auto;
  padding: 4px 16px;
  min-height: 120px; max-height: 34vh;
  display: flex; flex-direction: column; gap: 6px;
  font-size: 12px;
  -webkit-overflow-scrolling: touch;
}
.log-item {
  padding: 7px 11px; border-radius: 10px;
  white-space: pre-wrap; word-break: break-word;
  line-height: 1.5;
  animation: fadeIn 0.25s;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(5px); } }
.log-thought { background: rgba(180,75,255,0.1); color: #d8b6ff; border-right: 2px solid var(--accent2); }
.log-user    { background: rgba(25,211,255,0.1); color: #a8e8ff; border-right: 2px solid var(--accent); }
.log-result  { background: rgba(55,226,167,0.08); color: #9ff0d3; }
.log-event   { background: rgba(255,255,255,0.05); color: var(--dim); }
.log-error   { background: rgba(255,71,87,0.12); color: #ffb3bc; }

#ai-form {
  display: flex; gap: 8px;
  padding: 10px 16px 14px;
}
#ai-input {
  flex: 1;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(25,211,255,0.25);
  border-radius: 12px;
  padding: 11px 14px;
  color: var(--text); font-size: 14px;
  outline: none;
  direction: rtl;
}
#ai-input:focus { border-color: var(--accent); }
#ai-input::placeholder { color: var(--dim); }
#ai-send {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none; border-radius: 12px;
  padding: 0 18px;
  color: #04121e; font-weight: 800; font-size: 15px;
  cursor: pointer;
}

/* شاشات أكبر */
@media (min-width: 720px) {
  #ai-panel { left: auto; right: 16px; bottom: 16px; width: 400px; border-radius: 20px; border: 1px solid rgba(25,211,255,0.3); }
}