/* ══════════════════════════════════════
   main.css — Design System + Layout
   Big Band Space Planner
══════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ── Design Tokens ─────────────────── */
:root {
  --bg-0: #07070f;
  --bg-1: #0c0c1a;
  --bg-2: #111127;
  --bg-3: #181835;
  --bg-4: #1f1f42;
  --bg-hover: #252550;

  --accent: #5b8df8;
  --accent-dim: #3a6bdb;
  --accent-glow: rgba(91,141,248,0.25);
  --accent-text: #a8c4ff;

  --success: #34d399;
  --warning: #fbbf24;
  --danger: #f87171;
  --danger-dim: #dc2626;

  --text-1: #eeeef8;
  --text-2: #9898c0;
  --text-3: #555580;

  --border: rgba(255,255,255,0.07);
  --border-strong: rgba(255,255,255,0.15);

  --stage-light: #c49a3c;
  --stage-dark: #7a5c20;
  --audience-light: rgba(60,100,220,0.7);
  --audience-dark: rgba(20,40,120,0.9);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --font: 'Inter', system-ui, sans-serif;

  --sidebar-w: 236px;
  --panel-w: 264px;
  --header-h: 54px;
  --canvas-toolbar-h: 38px;
  --iso-controls-h: 60px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.6);
  --shadow-accent: 0 0 20px var(--accent-glow);
}

/* ── Reset ─────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  font-family: var(--font);
  font-size: 13px;
  color: var(--text-1);
  background: var(--bg-0);
  display: grid;
  grid-template-rows: var(--header-h) 1fr;
  grid-template-areas: "header" "main";
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}
button { font-family: var(--font); cursor: pointer; border: none; background: none; }
input, select { font-family: var(--font); }
svg { display: block; flex-shrink: 0; }

/* ── HEADER ────────────────────────── */
#app-header {
  grid-area: header;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  z-index: 100;
  position: relative;
}

.header-left { display: flex; align-items: center; flex-shrink: 0; }
.header-center { display: flex; align-items: center; gap: 8px; flex: 1; justify-content: center; }
.header-right { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }

/* Logo */
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon { font-size: 22px; }
.logo-text-group { display: flex; flex-direction: column; }
.logo-title { font-size: 14px; font-weight: 700; color: var(--text-1); letter-spacing: -0.3px; }
.logo-sub { font-size: 10px; color: var(--text-3); font-weight: 400; }

.hdr-divider { width: 1px; height: 28px; background: var(--border-strong); flex-shrink: 0; }

/* View Switcher */
.view-switcher {
  display: flex;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 2px;
}
.view-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-2);
  transition: all 0.18s ease;
}
.view-btn svg { width: 14px; height: 14px; }
.view-btn:hover { color: var(--text-1); background: var(--bg-3); }
.view-btn.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 12px var(--accent-glow);
}

/* Draw Tools */
.draw-tools {
  display: flex;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 2px;
}
.tool-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-2);
  transition: all 0.18s ease;
}
.tool-btn svg { width: 14px; height: 14px; }
.tool-btn:hover { color: var(--text-1); background: var(--bg-3); }
.tool-btn.active { background: var(--bg-4); color: var(--accent-text); border: 1px solid var(--accent-dim); }

/* Venue Size */
.venue-size-group {
  display: flex;
  align-items: center;
  gap: 5px;
}
.venue-label { font-size: 11px; color: var(--text-3); white-space: nowrap; }
.venue-size-group input {
  width: 46px;
  padding: 4px 6px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-1);
  font-size: 12px;
  text-align: center;
  transition: border-color 0.15s;
}
.venue-size-group input:focus { outline: none; border-color: var(--accent); }
.venue-unit { font-size: 11px; color: var(--text-3); }

/* Snap Toggle */
.snap-group {
  display: flex;
  align-items: center;
  gap: 8px;
}
.snap-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-2);
  cursor: pointer;
  user-select: none;
}
.snap-toggle input { display: none; }
.toggle-track {
  width: 30px; height: 16px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  position: relative;
  transition: background 0.2s;
}
.toggle-thumb {
  width: 10px; height: 10px;
  background: var(--text-3);
  border-radius: 50%;
  position: absolute;
  top: 2px; left: 2px;
  transition: transform 0.2s, background 0.2s;
}
.snap-toggle input:checked + .toggle-track { background: var(--accent); border-color: var(--accent); }
.snap-toggle input:checked + .toggle-track .toggle-thumb { transform: translateX(14px); background: #fff; }

.grid-select {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-size: 11px;
  padding: 3px 20px 3px 8px;
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s, color 0.15s;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='8' height='8' viewBox='0 0 24 24' fill='none' stroke='%23555580' stroke-width='3' stroke-linecap='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
}
.grid-select:focus {
  border-color: var(--accent);
  color: var(--text-1);
}
.grid-select option {
  background: var(--bg-2);
  color: var(--text-1);
}

/* Header Buttons */
.hdr-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 11px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-2);
  background: var(--bg-3);
  border: 1px solid var(--border);
  transition: all 0.18s ease;
}
.hdr-btn svg { width: 13px; height: 13px; }
.hdr-btn:hover { color: var(--text-1); background: var(--bg-4); border-color: var(--border-strong); }
.hdr-btn.accent { color: var(--accent-text); border-color: var(--accent-dim); }
.hdr-btn.accent:hover { background: var(--accent-dim); color: #fff; }
.hdr-btn.danger { color: var(--danger); }
.hdr-btn.danger:hover { background: rgba(248,113,113,0.15); border-color: var(--danger-dim); }

/* ── MAIN LAYOUT ────────────────────── */
#app-main {
  grid-area: main;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr var(--panel-w);
  grid-template-areas: "library canvas panel";
  overflow: hidden;
}

/* ── COMMON SIDEBAR ─────────────────── */
.sidebar {
  display: flex;
  flex-direction: column;
  background: var(--bg-2);
  border-color: var(--border);
  overflow: hidden;
}
.left-sidebar { grid-area: library; border-right: 1px solid var(--border); }
.right-sidebar { grid-area: panel; border-left: 1px solid var(--border); }

.sidebar-header {
  padding: 14px 14px 10px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.sidebar-header h2 {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 8px;
}

/* ── TOAST ──────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.toast {
  padding: 10px 18px;
  background: var(--bg-4);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--text-1);
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.25s ease, toastOut 0.3s 2.2s ease forwards;
  pointer-events: all;
}
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: var(--danger); }

@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes toastOut {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(-8px); }
}

/* ── Inputs & Forms ────────────────── */
input[type="number"], input[type="text"] {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-1);
  font-size: 12px;
  padding: 4px 7px;
  transition: border-color 0.15s;
  width: 100%;
}
input[type="number"]:focus,
input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}
input[type="search"] {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-1);
  font-size: 12px;
  padding: 6px 10px;
  width: 100%;
  transition: border-color 0.15s;
}
input[type="search"]:focus { outline: none; border-color: var(--accent); }
input[type="search"]::placeholder { color: var(--text-3); }
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-1);
  height: 4px;
  border-radius: 2px;
  outline: none;
  flex: 1;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 6px var(--accent-glow);
}

/* ── Scrollbar ─────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ── Utility ───────────────────────── */
.hidden { display: none !important; }