/* Theme tokens — canvas reads these via getComputedStyle in canvas.js */
:root[data-theme="dark"] {
  --canvas-bg: #0a1520;
  --canvas-shadow-zone: rgba(34, 211, 238, 0.14);
  --canvas-shadow-stroke: rgba(94, 234, 212, 0.55);
  --canvas-shadow-stroke-hover: #67e8f9;
  --canvas-line: rgba(45, 212, 191, 0.35);
  --canvas-sticky-glow: rgba(34, 211, 238, 0.42);
  --canvas-sticky-glow-blur: 14;
  --canvas-handle-fill: #22d3ee;
  --canvas-handle-stroke: #ecfeff;
  --canvas-border-selected: #22d3ee;
  --canvas-border-owned: rgba(148, 163, 184, 0.55);
  --canvas-border-other: rgba(100, 116, 139, 0.65);
  --canvas-text: #1e293b;
  --canvas-plane-label: rgba(226, 232, 240, 0.55);
  --canvas-nest: #34d399;
  --canvas-parent: #a78bfa;
  --canvas-collision: rgba(248, 113, 113, 0.38);

  --bg-toolbar: linear-gradient(180deg, rgba(15, 30, 48, 0.97) 0%, rgba(8, 18, 32, 0.99) 100%);
  --border-toolbar: rgba(34, 211, 238, 0.28);
  --shadow-toolbar: 0 0 28px rgba(34, 211, 238, 0.12), 0 4px 24px rgba(0, 0, 0, 0.45);
  --text-primary: #e2e8f0;
  --text-muted: #94a3b8;
  --text-faint: #64748b;

  --btn-bg: rgba(30, 58, 95, 0.65);
  --btn-bg-hover: rgba(45, 90, 130, 0.85);
  --btn-text: #e0f2fe;
  --btn-accent-bg: linear-gradient(135deg, #0891b2 0%, #0d9488 100%);
  --btn-accent-bg-hover: linear-gradient(135deg, #06b6d4 0%, #14b8a6 100%);
  --btn-accent-glow: 0 0 18px rgba(34, 211, 238, 0.35);

  --error-bg: linear-gradient(135deg, #be123c 0%, #9f1239 100%);
  --error-glow: 0 0 20px rgba(244, 63, 94, 0.35);

  --overlay-bg: rgba(4, 12, 24, 0.72);
  --modal-bg: linear-gradient(165deg, rgba(17, 36, 56, 0.98) 0%, rgba(10, 24, 40, 0.99) 100%);
  --modal-border: rgba(45, 212, 191, 0.22);
  --modal-shadow: 0 0 48px rgba(45, 212, 191, 0.12), 0 12px 40px rgba(0, 0, 0, 0.55);
  --modal-input-bg: rgba(8, 20, 36, 0.9);
  --modal-input-border: rgba(34, 211, 238, 0.25);
  --modal-input-focus: #22d3ee;
  --link: #5eead4;
  --link-hover: #99f6e4;
  --oauth-border: rgba(148, 163, 184, 0.25);

  --editor-border: #22d3ee;
}

:root[data-theme="light"] {
  --canvas-bg: #e8e8e8;
  --canvas-shadow-zone: rgba(255, 253, 200, 0.6);
  --canvas-shadow-stroke: rgba(180, 170, 100, 0.7);
  --canvas-shadow-stroke-hover: #8b5cf6;
  --canvas-line: rgba(100, 100, 100, 0.45);
  --canvas-sticky-glow: rgba(0, 0, 0, 0.28);
  --canvas-sticky-glow-blur: 10;
  --canvas-handle-fill: #0066cc;
  --canvas-handle-stroke: #ffffff;
  --canvas-border-selected: #0066cc;
  --canvas-border-owned: #cccccc;
  --canvas-border-other: #999999;
  --canvas-text: #333333;
  --canvas-plane-label: rgba(0, 0, 0, 0.45);
  --canvas-nest: #22c55e;
  --canvas-parent: #8b5cf6;
  --canvas-collision: rgba(220, 38, 38, 0.35);

  --bg-toolbar: #fff;
  --border-toolbar: #ddd;
  --shadow-toolbar: 0 2px 4px rgba(0, 0, 0, 0.08);
  --text-primary: #333;
  --text-muted: #555;
  --text-faint: #999;

  --btn-bg: #f0f0f0;
  --btn-bg-hover: #e0e0e0;
  --btn-text: #333;
  --btn-accent-bg: #ffeb3b;
  --btn-accent-bg-hover: #fdd835;
  --btn-accent-glow: none;

  --error-bg: #f44336;
  --error-glow: none;

  --overlay-bg: rgba(0, 0, 0, 0.45);
  --modal-bg: #fff;
  --modal-border: transparent;
  --modal-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  --modal-input-bg: #fff;
  --modal-input-border: #ddd;
  --modal-input-focus: #0066cc;
  --link: #0066cc;
  --link-hover: #0066cc;
  --oauth-border: #ddd;

  --editor-border: #0066cc;
}

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

body {
  overflow: hidden;
  font-family: Arial, sans-serif;
  user-select: none;
  background: var(--canvas-bg);
  color: var(--text-primary);
}

canvas {
  display: block;
  position: fixed;
  top: 0;
  left: 0;
}

/* ── Toolbar ──────────────────────────────── */
#toolbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: var(--bg-toolbar);
  border-bottom: 1px solid var(--border-toolbar);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 16px;
  z-index: 100;
  box-shadow: var(--shadow-toolbar);
}

.toolbar-left  { display: flex; align-items: center; }
.toolbar-center { display: flex; align-items: center; gap: 8px; flex: 1; justify-content: center; }
.toolbar-right  { display: flex; align-items: center; gap: 8px; }

.app-title {
  font-size: 18px;
  font-weight: bold;
  color: var(--text-primary);
}

#user-label {
  font-size: 14px;
  color: var(--text-muted);
}

#rate-limit-msg {
  font-size: 13px;
  color: var(--text-faint);
}

#btn-theme {
  min-width: 40px;
  font-size: 18px;
  line-height: 1;
  padding: 6px 10px;
}

/* ── Buttons ──────────────────────────────── */
button {
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  background: var(--btn-bg);
  color: var(--btn-text);
  transition: background 0.15s, box-shadow 0.15s, border-color 0.15s;
}

button:hover    { background: var(--btn-bg-hover); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

:root[data-theme="dark"] button:not(#btn-add):not(#btn-submit-auth):not(#error-banner button) {
  border-color: rgba(34, 211, 238, 0.15);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.06);
}

:root[data-theme="dark"] button:not(#btn-add):not(#btn-submit-auth):not(#error-banner button):hover {
  box-shadow: 0 0 16px rgba(45, 212, 191, 0.12);
  border-color: rgba(45, 212, 191, 0.28);
}

#btn-add {
  background: var(--btn-accent-bg);
  font-weight: bold;
  border-color: rgba(6, 182, 212, 0.35);
  box-shadow: var(--btn-accent-glow);
}
#btn-add:hover {
  background: var(--btn-accent-bg-hover);
  box-shadow: 0 0 22px rgba(45, 212, 191, 0.45);
}

:root[data-theme="light"] #btn-add {
  border-color: transparent;
  box-shadow: none;
}
:root[data-theme="light"] #btn-add:hover {
  box-shadow: none;
}

/* ── Error banner ─────────────────────────── */
#error-banner {
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  background: var(--error-bg);
  color: #fff;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 200;
  font-size: 14px;
  box-shadow: var(--error-glow);
}

#error-banner button {
  background: none;
  color: #fff;
  font-size: 20px;
  padding: 0 6px;
  line-height: 1;
  border: none;
  box-shadow: none;
}
#error-banner button:hover { background: rgba(255,255,255,0.2); }

/* ── Modal ────────────────────────────────── */
#modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  backdrop-filter: blur(4px);
}

#modal {
  background: var(--modal-bg);
  border: 1px solid var(--modal-border);
  border-radius: 12px;
  padding: 32px;
  width: 400px;
  max-width: 90vw;
  box-shadow: var(--modal-shadow);
}

#modal h2 {
  margin-bottom: 8px;
  color: var(--text-primary);
}

#modal label {
  display: block;
  font-size: 13px;
  font-weight: bold;
  color: var(--text-muted);
  margin-top: 16px;
  margin-bottom: 4px;
}

#modal input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--modal-input-border);
  border-radius: 6px;
  font-size: 14px;
  outline: none;
  font-family: inherit;
  background: var(--modal-input-bg);
  color: var(--text-primary);
  box-shadow: inset 0 0 12px rgba(0, 0, 0, 0.15);
}

:root[data-theme="dark"] #modal input:focus {
  border-color: var(--modal-input-focus);
  box-shadow:
    inset 0 0 12px rgba(0, 0, 0, 0.2),
    0 0 16px rgba(34, 211, 238, 0.2);
}

:root[data-theme="light"] #modal input:focus {
  border-color: var(--modal-input-focus);
  box-shadow: none;
}

.modal-actions {
  display: flex;
  gap: 8px;
  margin-top: 24px;
}

#btn-submit-auth {
  background: linear-gradient(135deg, #0891b2 0%, #0d9488 100%);
  color: #ecfeff;
  flex: 1;
  border-color: rgba(34, 211, 238, 0.35);
  box-shadow: 0 0 18px rgba(34, 211, 238, 0.25);
}
#btn-submit-auth:hover {
  background: linear-gradient(135deg, #06b6d4 0%, #14b8a6 100%);
  box-shadow: 0 0 24px rgba(45, 212, 191, 0.4);
}

:root[data-theme="light"] #btn-submit-auth {
  background: #0066cc;
  border-color: transparent;
  box-shadow: none;
}
:root[data-theme="light"] #btn-submit-auth:hover {
  background: #0055aa;
  box-shadow: none;
}

.mode-switch {
  margin-top: 16px;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}
.mode-switch a { color: var(--link); text-decoration: none; }
.mode-switch a:hover { color: var(--link-hover); text-decoration: underline; }

/* ── Google OAuth ─────────────────────────── */
.oauth-divider {
  display: flex;
  align-items: center;
  margin-top: 16px;
  color: var(--text-faint);
  font-size: 13px;
}
.oauth-divider::before,
.oauth-divider::after {
  content: '';
  flex: 1;
  border-top: 1px solid var(--oauth-border);
}
.oauth-divider span { padding: 0 10px; }

.btn-google {
  display: block;
  text-align: center;
  padding: 10px;
  border: 1px solid var(--oauth-border);
  border-radius: 6px;
  color: var(--text-muted);
  text-decoration: none;
  margin-top: 8px;
  font-size: 14px;
  transition: background 0.15s, box-shadow 0.15s;
}

:root[data-theme="dark"] .btn-google:hover {
  background: rgba(34, 211, 238, 0.08);
  box-shadow: 0 0 16px rgba(34, 211, 238, 0.12);
}

:root[data-theme="light"] .btn-google:hover {
  background: #f5f5f5;
  box-shadow: none;
}

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