:root {
  color-scheme: light;
  --bg: #f3f7ff;
  --bg-elevated: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --line: #dbe4f0;
  --primary: #2563eb;
  --primary-strong: #1d4ed8;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --radius: 16px;
}

body.dark {
  color-scheme: dark;
  --bg: #020617;
  --bg-elevated: #0b1221;
  --text: #e2e8f0;
  --muted: #93a4bf;
  --line: #233045;
  --primary: #3b82f6;
  --primary-strong: #2563eb;
  --success: #22c55e;
  --warning: #fbbf24;
  --danger: #fb7185;
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: Inter, Segoe UI, Arial, sans-serif; background: var(--bg); color: var(--text); }
.hidden { display: none !important; }

.app-shell { min-height: 100vh; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-elevated) 88%, transparent);
  backdrop-filter: blur(10px);
}

.brand-wrap { display: flex; align-items: center; gap: 12px; }
.logo-pill {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(140deg, var(--primary), #6ea0ff);
  color: #fff;
  font-weight: 700;
  display: grid;
  place-items: center;
}

h1 { font-size: 18px; margin: 0; }
.subhead { margin: 2px 0 0; color: var(--muted); font-size: 13px; }

.topbar-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

.dashboard {
  width: min(1200px, 100% - 24px);
  margin: 18px auto 40px;
  display: grid;
  gap: 16px;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  animation: fadeInUp .45s ease;
}

.card-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.card h2 { margin: 0; font-size: 20px; }

.inline-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

.btn, .chip, .preset-btn {
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 14px;
  cursor: pointer;
  transition: all .2s ease;
}

.btn:hover, .chip:hover, .preset-btn:hover { transform: translateY(-1px); border-color: var(--primary); }
.btn:active, .chip:active, .preset-btn:active { transform: translateY(0); }

.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-strong); }
.btn-upgrade { background: linear-gradient(145deg, #7c3aed, #4f46e5); color: #fff; border-color: transparent; }
.btn-ghost { background: transparent; }

.preset-row { margin-top: 14px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.label-title { font-weight: 600; font-size: 13px; color: var(--muted); margin-right: 6px; }

.form-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 13px; color: var(--muted); font-weight: 600; }
.field input, .field select {
  width: 100%;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  outline: none;
}
.field input:focus, .field select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15); }

.field-checks { justify-content: end; }
.check-row { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text); }
.check-row input { width: auto; }

.tip {
  display: inline-grid;
  place-items: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--primary) 18%, transparent);
  color: var(--primary);
  font-size: 11px;
  margin-left: 4px;
  position: relative;
}
.tip::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%) scale(.98);
  min-width: 180px;
  max-width: 230px;
  background: var(--text);
  color: var(--bg-elevated);
  padding: 8px;
  border-radius: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .16s ease, transform .16s ease;
  font-size: 12px;
  z-index: 3;
}
.tip:hover::after { opacity: 1; transform: translateX(-50%) scale(1); }

.suggestion {
  margin-top: 12px;
  font-size: 14px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 10px;
  color: var(--muted);
}

.result-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.saved-list {
  margin-top: 12px;
  display: grid;
  gap: 8px;
}
.saved-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.saved-meta {
  display: grid;
  gap: 2px;
}
.saved-name {
  font-weight: 600;
  font-size: 14px;
}
.saved-time {
  color: var(--muted);
  font-size: 12px;
}
.saved-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.saved-action-btn {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 12px;
  cursor: pointer;
}
.saved-action-btn:hover {
  border-color: var(--primary);
}
.kpi {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.kpi span { color: var(--muted); font-size: 13px; }
.kpi strong { font-size: 18px; }

.density-wrap { margin-top: 14px; display: grid; gap: 8px; }
.density-badge { font-weight: 600; color: var(--text); }
.density-track {
  height: 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--line) 70%, transparent);
  overflow: hidden;
}
.density-fill {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--danger), var(--warning), var(--success));
  transition: width .35s ease;
}

.summary {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.5;
  background: color-mix(in srgb, var(--primary) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--primary) 25%, transparent);
  border-radius: 10px;
  padding: 10px;
}

.result-actions { margin-top: 12px; display: flex; gap: 8px; flex-wrap: wrap; }

.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}
.chart-box { border: 1px solid var(--line); border-radius: 12px; padding: 10px; }
canvas { width: 100% !important; height: 280px !important; }

.grid-title { margin: 16px 0 8px; }
.cell-grid {
  display: grid;
  gap: 6px;
  min-height: 70px;
}
.cell-node {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.25);
  opacity: 0;
  transform: scale(.8);
  animation: popCell .35s ease forwards;
}

.faq-card h3 { margin-bottom: 6px; }
.faq-item + .faq-item { margin-top: 10px; }
.faq-item p { margin: 0; color: var(--muted); }

.muted { color: var(--muted); }

.tool-extra-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.tool-toggle-btn {
  background: linear-gradient(135deg, #ffffff, #f8fafc);
  color: #0f172a;
  border: 1px solid #e2e8f0;
  border-radius: 14px;
  padding: 12px 16px;
  font-weight: 600;
  cursor: pointer;
}

.legal-popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1100;
  padding: 20px;
}
.legal-popup-box {
  width: 100%;
  max-width: 520px;
  background: #fff;
  border-radius: 22px;
  padding: 28px;
  text-align: center;
}
.legal-popup-box button {
  margin-top: 10px;
  background: #2563eb;
  color: #fff;
  border: none;
  padding: 12px 20px;
  border-radius: 12px;
  cursor: pointer;
}

.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1200;
  padding: 20px;
}
.popup-overlay.active { display: flex; }
.popup-box {
  width: 100%;
  max-width: 720px;
  background: #fff;
  border-radius: 24px;
  padding: 28px;
  position: relative;
  max-height: calc(100vh - 40px);
  overflow: auto;
}
.popup-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: #f1f5f9;
  cursor: pointer;
}
textarea {
  width: 100%;
  min-height: 160px;
  margin-top: 10px;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  padding: 10px;
  font-family: Consolas, monospace;
}
.copy-btn {
  margin-top: 12px;
  background: #10b981;
  color: #fff;
  border: none;
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
}

body.dark .tool-toggle-btn,
body.dark .popup-box,
body.dark .legal-popup-box,
body.dark textarea { background: #0f172a; color: #e2e8f0; }
body.dark .popup-close { background: #1e293b; color: #e2e8f0; }

@media (max-width: 1000px) {
  .form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .result-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .topbar { flex-direction: column; align-items: flex-start; }
  .topbar-actions { width: 100%; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .topbar-actions .btn { width: 100%; }
  .form-grid { grid-template-columns: 1fr; }
  .charts-grid { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; }
  .chip, .preset-btn, .btn { min-height: 44px; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes popCell {
  to { opacity: 1; transform: scale(1); }
}