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

:root {
  --bg:         #0a0e1a;
  --panel-bg:   rgba(12, 16, 28, 0.92);
  --border:     rgba(255,255,255,0.08);
  --accent:     #7b61ff;
  --accent-dim: rgba(123, 97, 255, 0.18);
  --gold:       #f5c518;
  --text:       #d4d8e8;
  --text-dim:   #6b7280;
  --danger:     #ef4444;
  --radius:     12px;
}

html, body {
  width: 100%; height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  font-size: 14px;
  overflow: hidden;
}

/* ── Canvas ── */
#canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  display: block;
}

/* CSS2DRenderer layer sits on top of the canvas but passes pointer events through */
#css2d-layer {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

/* ── Node label (CSS2DObject) ── */
.node-label {
  color: rgba(212, 216, 232, 0.9);
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
  text-shadow: 0 0 6px rgba(0,0,0,0.8), 0 1px 3px rgba(0,0,0,0.9);
  pointer-events: none;
  user-select: none;
  padding: 2px 5px;
}

/* ── Sidebar ── */
#sidebar {
  position: fixed;
  top: 0; right: 0;
  width: 280px; height: 100%;
  background: var(--panel-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-left: 1px solid var(--border);
  z-index: 10;
  display: flex;
  flex-direction: column;
}

#sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 18px 14px;
  border-bottom: 1px solid var(--border);
}

.sidebar-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}

#interest-count {
  font-size: 11px;
  color: var(--text-dim);
}

#interests-list {
  list-style: none;
  flex: 1;
  overflow-y: auto;
  padding: 10px 0;
}

#interests-list::-webkit-scrollbar { width: 4px; }
#interests-list::-webkit-scrollbar-track { background: transparent; }
#interests-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.interest-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 18px;
  cursor: default;
  transition: background 0.15s;
}

.interest-item:hover { background: rgba(255,255,255,0.04); }

.interest-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

.interest-label {
  flex: 1;
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.interest-remove {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 0 2px;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s;
}

.interest-item:hover .interest-remove { opacity: 1; }
.interest-remove:hover { color: var(--danger); }

#sidebar-footer {
  padding: 16px 18px;
  border-top: 1px solid var(--border);
}

#btn-research {
  width: 100%;
  padding: 11px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
}

#btn-research:hover:not(:disabled) { background: #6a50ee; }
#btn-research:disabled { background: var(--accent-dim); color: var(--text-dim); cursor: not-allowed; }

/* ── Node overlay ── */
#node-overlay {
  display: none;
  position: fixed;
  z-index: 20;
  width: 260px;
  background: rgba(16, 20, 36, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px 16px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.6);
}

#overlay-close {
  position: absolute;
  top: 8px; right: 10px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 18px;
  cursor: pointer;
  line-height: 1;
}

#overlay-close:hover { color: var(--text); }

#overlay-topic {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 10px;
  padding-right: 20px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#overlay-input {
  width: 100%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 13px;
  padding: 9px 12px;
  outline: none;
  transition: border-color 0.15s;
  margin-bottom: 10px;
}

#overlay-input:focus { border-color: var(--accent); }

#overlay-actions {
  display: flex;
  gap: 8px;
}

#overlay-submit {
  flex: 1;
  padding: 9px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

#overlay-submit:hover:not(:disabled) { background: #6a50ee; }
#overlay-submit:disabled { background: var(--accent-dim); color: var(--text-dim); cursor: not-allowed; }

#overlay-flag {
  padding: 9px 12px;
  background: rgba(245, 197, 24, 0.12);
  color: #c8a400;
  border: 1px solid rgba(245, 197, 24, 0.25);
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}

#overlay-flag:hover,
#overlay-flag.active {
  background: rgba(245, 197, 24, 0.22);
  color: var(--gold);
}

/* ── Settings panel ── */
#settings-panel {
  display: none;
  position: fixed;
  top: 60px; left: 20px;
  width: 300px;
  background: var(--panel-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  z-index: 15;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

#settings-panel.open { display: block; }

#settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 13px;
}

#settings-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 18px;
  cursor: pointer;
}

#settings-body {
  padding: 12px 16px 16px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}

#settings-body::-webkit-scrollbar { width: 4px; }
#settings-body::-webkit-scrollbar-track { background: transparent; }
#settings-body::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.settings-section {
  margin-bottom: 16px;
}

.settings-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.settings-select,
.settings-input {
  width: 100%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 13px;
  padding: 8px 10px;
  outline: none;
  transition: border-color 0.15s;
  margin-bottom: 4px;
}

.settings-select { cursor: pointer; }
.settings-select option { background: #1a1e30; }
.settings-select:focus,
.settings-input:focus { border-color: var(--accent); }

.settings-hint {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 2px;
}

.settings-slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.settings-slider {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}

.settings-slider-val {
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
  min-width: 70px;
  text-align: right;
}

.settings-toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  padding: 5px 0;
  font-size: 13px;
  color: var(--text);
  user-select: none;
}

.settings-toggle-row input[type="checkbox"] {
  accent-color: var(--accent);
  width: 15px; height: 15px;
  cursor: pointer;
}

.settings-group {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.settings-group:last-child { border-bottom: none; }

.settings-group-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.settings-account-email {
  font-size: 13px;
  color: var(--text);
  padding: 8px 10px;
  background: rgba(255,255,255,0.04);
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 10px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.settings-logout-btn {
  width: 100%;
  padding: 9px;
  background: rgba(239,68,68,0.12);
  color: #f87171;
  border: 1px solid rgba(239,68,68,0.25);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.settings-logout-btn:hover { background: rgba(239,68,68,0.22); }

/* ── Research progress modal ── */
#progress-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5,7,14,0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 150;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

#progress-modal {
  background: #0f1322;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 18px;
  width: 100%;
  max-width: 480px;
  padding: 36px 32px 32px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.7);
  text-align: center;
}

#progress-icon {
  font-size: 40px;
  margin-bottom: 16px;
  line-height: 1;
  transition: all 0.3s;
}

#progress-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 20px;
}

#progress-bar-wrap {
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 16px;
}

#progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.5s ease, background 0.4s;
}

#progress-message {
  font-size: 13px;
  color: var(--text-dim);
  margin: 0 0 16px;
  min-height: 18px;
}

#progress-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  margin-bottom: 20px;
  min-height: 28px;
}

.progress-chip {
  background: rgba(123,97,255,0.15);
  border: 1px solid rgba(123,97,255,0.3);
  color: #a78bfa;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 20px;
  animation: chipIn 0.25s ease;
}

@keyframes chipIn {
  from { opacity: 0; transform: scale(0.85); }
  to   { opacity: 1; transform: scale(1); }
}

#progress-close {
  padding: 10px 28px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
#progress-close:hover { background: #6a50ee; }

/* ── Auth modal ── */
#auth-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 7, 14, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

#auth-modal {
  background: #0f1322;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 18px;
  width: 100%;
  max-width: 400px;
  padding: 36px 32px 32px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.7);
}

#auth-logo {
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 24px;
  color: var(--text);
}

.auth-title {
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 6px;
  color: var(--text);
}

.auth-subtitle {
  font-size: 13px;
  color: var(--text-dim);
  text-align: center;
  margin-bottom: 24px;
}

.auth-field { margin-bottom: 14px; }

.auth-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.auth-input {
  width: 100%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 9px;
  color: var(--text);
  font-size: 14px;
  padding: 11px 14px;
  outline: none;
  transition: border-color 0.15s;
}
.auth-input:focus { border-color: var(--accent); }

.auth-error {
  background: rgba(239,68,68,0.12);
  border: 1px solid rgba(239,68,68,0.3);
  color: #f87171;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  margin-bottom: 14px;
}

.auth-btn {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 4px;
  transition: background 0.2s, opacity 0.2s;
}
.auth-btn:hover:not(:disabled) { background: #6a50ee; }
.auth-btn:disabled { opacity: 0.55; cursor: not-allowed; }

.auth-switch {
  font-size: 13px;
  color: var(--text-dim);
  text-align: center;
  margin-top: 18px;
}
.auth-switch a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}
.auth-switch a:hover { text-decoration: underline; }

/* ── Onboarding overlay ── */
#ob-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 7, 14, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

#ob-modal {
  background: #0f1322;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 18px;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.7);
  overflow: hidden;
}

#ob-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 28px 0;
}

#ob-logo {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

#ob-step-indicator {
  display: flex;
  gap: 6px;
}

.ob-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  transition: background 0.3s;
}
.ob-dot.active  { background: var(--accent); }
.ob-dot.done    { background: rgba(123,97,255,0.45); }

#ob-body {
  padding: 24px 28px 20px;
}

.ob-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.ob-subtitle {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 20px;
}

#ob-provider-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.ob-provider-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 8px;
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.ob-provider-card input[type="radio"] { display: none; }

.ob-provider-card:hover { background: rgba(255,255,255,0.04); }
.ob-provider-card.selected {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.ob-provider-icon { font-size: 22px; line-height: 1; }
.ob-provider-label { font-size: 12px; font-weight: 500; text-align: center; color: var(--text); }

.ob-field { margin-bottom: 14px; }

.ob-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 6px;
  letter-spacing: 0.04em;
}

.ob-required { color: var(--accent); }
.ob-hint-inline { color: var(--text-dim); font-weight: 400; }

.ob-input, .ob-select {
  width: 100%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 9px;
  color: var(--text);
  font-size: 13px;
  padding: 10px 12px;
  outline: none;
  transition: border-color 0.15s;
}
.ob-select { cursor: pointer; }
.ob-select option { background: #1a1e30; }
.ob-input:focus, .ob-select:focus { border-color: var(--accent); }

.ob-hint {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 5px;
  line-height: 1.5;
}

.ob-field-error {
  font-size: 12px;
  color: #f87171;
  margin-top: 5px;
}

.ob-skip-note {
  font-size: 12px;
  color: var(--text-dim);
  text-align: center;
  margin-top: 8px;
  font-style: italic;
}

.ob-summary {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.ob-summary-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 16px;
  border-bottom: 1px solid var(--border);
}
.ob-summary-row:last-child { border-bottom: none; }

.ob-summary-label { font-size: 13px; color: var(--text-dim); }
.ob-summary-value { font-size: 13px; font-weight: 500; color: var(--text); }
.ob-ok   { color: #4ade80 !important; }
.ob-warn { color: #fb923c !important; }
.ob-muted { color: var(--text-dim) !important; }

#ob-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px 24px;
  border-top: 1px solid var(--border);
  gap: 12px;
}

.ob-btn {
  padding: 10px 24px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background 0.2s, opacity 0.2s;
}

.ob-btn-primary {
  background: var(--accent);
  color: #fff;
  flex: 1;
}
.ob-btn-primary:hover:not(:disabled) { background: #6a50ee; }
.ob-btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.ob-btn-ghost {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.ob-btn-ghost:hover { background: rgba(255,255,255,0.05); color: var(--text); }

@keyframes ob-shake {
  0%, 100% { transform: translateX(0); }
  20%, 60%  { transform: translateX(-6px); }
  40%, 80%  { transform: translateX(6px); }
}
.ob-shake { animation: ob-shake 0.4s ease; }

/* ── Settings toggle ── */
#btn-settings {
  position: fixed;
  top: 16px; left: 16px;
  width: 38px; height: 38px;
  background: var(--panel-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-dim);
  font-size: 18px;
  cursor: pointer;
  z-index: 15;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
}

#btn-settings:hover { background: var(--accent-dim); color: var(--text); }