/* ============ 基础重置 ============ */
:root {
  --bg: #0b1020;
  --bg-elev: #131a32;
  --bg-card: #1a2240;
  --bg-card-2: #202b52;
  --border: #2a3666;
  --text: #e8ecf7;
  --text-dim: #9aa3c4;
  --text-mute: #6b75a3;
  --primary: #4d8dff;
  --primary-2: #6ba6ff;
  --primary-soft: rgba(77, 141, 255, 0.12);
  --accent: #2dd4bf;
  --warn: #fbbf24;
  --danger: #ef4444;
  --success: #34d399;
  --blue: #4d8dff;
  --red: #f87171;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
  --transition: 0.22s ease;
  --sidebar-w: 260px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 800px at 80% -10%, #1a2455 0%, transparent 60%),
              radial-gradient(900px 700px at -10% 100%, #162048 0%, transparent 55%),
              var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}

button { font-family: inherit; cursor: pointer; }
canvas { display: block; max-width: 100%; }

/* ============ 应用骨架 ============ */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

/* ============ 侧边栏 ============ */
.sidebar {
  background: linear-gradient(180deg, #0e1530 0%, #0a0f24 100%);
  border-right: 1px solid var(--border);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 18px;
}
.brand-logo {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  display: grid;
  place-items: center;
  color: #fff;
  box-shadow: 0 6px 18px rgba(77, 141, 255, 0.4);
}
.brand-text { display: flex; flex-direction: column; }
.brand-text strong { font-size: 15px; color: var(--text); }
.brand-text span { font-size: 11px; color: var(--text-mute); letter-spacing: 0.5px; }

.nav { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  border-radius: 10px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition);
  border: 1px solid transparent;
}
.nav-item:hover {
  background: var(--bg-card);
  color: var(--text);
}
.nav-item.active {
  background: var(--primary-soft);
  color: var(--primary-2);
  border-color: rgba(77, 141, 255, 0.3);
}
.nav-icon {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  font-size: 16px;
  color: inherit;
}

.sidebar-footer {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.env-check { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.env-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-dim);
}
.dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-mute);
}
.dot.ok { background: var(--success); box-shadow: 0 0 8px var(--success); }
.dot.err { background: var(--danger); }
.disclaimer {
  font-size: 11px;
  color: var(--text-mute);
  line-height: 1.5;
}

/* ============ 主内容 ============ */
.content {
  padding: 36px 44px 60px;
  overflow-x: hidden;
}
.view { display: none; animation: fadeIn 0.3s ease; }
.view.active { display: block; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-header { margin-bottom: 24px; }
.page-header h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
}
.subtitle { color: var(--text-dim); margin-top: 6px; font-size: 14px; }

/* ============ 概览页 ============ */
.warn-banner {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  background: linear-gradient(135deg, rgba(251, 191, 36, 0.1), rgba(251, 191, 36, 0.04));
  border: 1px solid rgba(251, 191, 36, 0.25);
  padding: 14px 18px;
  border-radius: var(--radius);
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 28px;
}
.warn-banner strong { color: var(--warn); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
  margin-bottom: 32px;
}
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.tool-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.tool-card:hover {
  transform: translateY(-3px);
  border-color: rgba(77, 141, 255, 0.4);
  background: var(--bg-card-2);
}
.tool-card:hover::before { transform: scaleX(1); }
.tool-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  display: grid; place-items: center;
  font-size: 26px;
  margin-bottom: 14px;
  background: var(--primary-soft);
  color: var(--primary-2);
}
.tool-icon.high { background: rgba(45, 212, 191, 0.12); color: var(--accent); }
.tool-icon.disc { background: rgba(168, 85, 247, 0.12); color: #c084fc; }
.tool-icon.loc  { background: rgba(251, 191, 36, 0.12); color: var(--warn); }
.tool-card h3 { font-size: 17px; margin-bottom: 6px; }
.tool-card p { font-size: 13px; color: var(--text-dim); margin-bottom: 14px; min-height: 38px; }
.tool-meta {
  font-size: 12px;
  color: var(--text-mute);
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  display: block;
}

.info-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.info-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.info-num {
  font-size: 26px;
  font-weight: 700;
  color: var(--primary-2);
}
.info-label { font-size: 12px; color: var(--text-mute); margin-top: 4px; }

/* ============ 测试通用 ============ */
.test-shell {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}
.test-panel, .result-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.result-panel h3 {
  font-size: 15px;
  margin-bottom: 14px;
  color: var(--text);
}
.result-panel canvas {
  width: 100%;
  height: auto;
  background: var(--bg-elev);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.legend {
  display: flex;
  gap: 18px;
  margin-top: 12px;
  font-size: 12px;
  color: var(--text-dim);
  flex-wrap: wrap;
}
.legend span { display: flex; align-items: center; gap: 6px; }
.mark { display: inline-block; width: 12px; height: 12px; border-radius: 50%; }
.mark.blue { background: var(--blue); }
.mark.red { background: var(--red); }
.mark.line { background: transparent; border-top: 2px dashed var(--text-mute); border-radius: 0; height: 4px; }
.footnote { font-size: 11px; color: var(--text-mute); margin-top: 10px; }

.test-status {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 22px;
}
.status-block {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
}
.status-block.wide { grid-column: span 2; }
.status-label {
  display: block;
  font-size: 11px;
  color: var(--text-mute);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.status-value {
  font-size: 18px;
  font-weight: 600;
  color: var(--primary-2);
}
.status-value.big-num { font-size: 26px; }

.test-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.btn {
  background: var(--bg-card-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  transition: all var(--transition);
}
.btn:hover:not(:disabled) {
  background: var(--bg-elev);
  border-color: var(--primary);
}
.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.btn.primary, .btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 6px 18px rgba(77, 141, 255, 0.35);
}
.btn-primary:hover:not(:disabled) {
  filter: brightness(1.08);
  transform: translateY(-1px);
}
.btn.big, .btn-primary.big {
  padding: 14px 28px;
  font-size: 15px;
}
.btn-ghost { background: transparent; }
.btn-danger { background: rgba(239, 68, 68, 0.12); color: var(--danger); border-color: rgba(239, 68, 68, 0.3); }
.btn-danger:hover:not(:disabled) { background: rgba(239, 68, 68, 0.2); }

.hint {
  font-size: 13px;
  color: var(--text-dim);
  background: var(--bg-elev);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
  margin-bottom: 16px;
}

.progress-bar {
  height: 6px;
  background: var(--bg-elev);
  border-radius: 4px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 4px;
  transition: width 0.4s ease;
}

/* ============ 高频 ============ */
.freq-scale {
  margin-top: 18px;
}
.freq-bar {
  height: 10px;
  background: var(--bg-elev);
  border-radius: 4px;
  position: relative;
  overflow: hidden;
}
.freq-bar::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  transition: width 0.3s ease;
}
.freq-marks {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--text-mute);
  margin-top: 4px;
}

/* ============ 定位盘 ============ */
.localization-pad {
  background: var(--bg-elev);
  border-radius: var(--radius);
  padding: 18px;
  margin-top: 14px;
  cursor: crosshair;
}
.localization-pad svg {
  display: block;
  margin: 0 auto;
  max-width: 360px;
}

/* ============ 结果页 ============ */
.results-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-mute);
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}
.result-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin-bottom: 16px;
}
.result-block h3 {
  font-size: 16px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.result-block .badge {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary-2);
  font-weight: 500;
}
.result-block .badge.ok { background: rgba(52, 211, 153, 0.15); color: var(--success); }
.result-block .badge.warn { background: rgba(251, 191, 36, 0.15); color: var(--warn); }
.result-block .badge.bad { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.result-block table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-top: 8px;
}
.result-block th, .result-block td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}
.result-block th { color: var(--text-mute); font-weight: 500; }
.result-block td { color: var(--text); }
.result-block canvas {
  margin-top: 14px;
  width: 100%;
  background: var(--bg-elev);
  border-radius: var(--radius-sm);
}

/* ============ Toast ============ */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--bg-card-2);
  color: var(--text);
  padding: 12px 22px;
  border-radius: 10px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  font-size: 13px;
  z-index: 1000;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: relative;
    height: auto;
    flex-direction: column;
  }
  .nav { flex-direction: row; flex-wrap: wrap; }
  .nav-item { flex: 1; min-width: 120px; }
  .content { padding: 24px 20px 40px; }
  .test-shell { grid-template-columns: 1fr; }
  .test-status { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .info-strip { grid-template-columns: repeat(2, 1fr); }
  .page-header h1 { font-size: 22px; }
  .test-status { grid-template-columns: 1fr 1fr; }
}