:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1f2430;
  --text: #e6e8ee;
  --muted: #8a93a6;
  --accent: #4c8dff;
  --accent-2: #6aa9ff;
  --border: #262b37;
  --danger: #e5484d;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

header {
  padding: 20px 32px 4px;
}

header h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: 0.2px;
}

.subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

main {
  display: block;
  padding: 8px 32px 48px;
  max-width: 1600px;
  margin: 0 auto;
}

/* -------- top tabs -------- */
.tabs {
  display: flex;
  gap: 4px;
  padding: 16px 32px 0;
  border-bottom: 1px solid var(--border);
  max-width: 1600px;
  margin: 0 auto;
  flex-wrap: wrap;
}

.tab {
  display: inline-block;
  padding: 8px 16px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  font-size: 13px;
  font-weight: 500;
  transition: color 0.12s ease, background 0.12s ease, border-color 0.12s ease;
}

.tab:hover {
  color: var(--text);
  background: var(--panel-2);
}

.tab.active {
  color: var(--text);
  background: var(--panel);
  border-color: var(--border);
  border-bottom: 1px solid var(--panel);
  margin-bottom: -1px;
  position: relative;
  z-index: 1;
}

/* -------- chart panel -------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0 10px 10px 10px;
  padding: 16px 20px;
  margin-top: 0;
}

.chart-panel { margin-top: 0; }

.chart-toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.inline-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
}

select {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 10px;
  font-size: 13px;
  outline: none;
}

select:focus { border-color: var(--accent); }
select:disabled { opacity: 0.5; cursor: not-allowed; }

input[type="text"] {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 10px;
  font-size: 13px;
  outline: none;
  min-width: 180px;
}

input[type="text"]:focus { border-color: var(--accent); }

.url-filter-label { min-width: 260px; }

.url-filter-input {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-sm {
  padding: 6px 10px;
  font-size: 12px;
}

.chart-layout {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 16px;
  align-items: stretch;
}

.chart-box {
  position: relative;
  background: var(--panel-2);
  border-radius: 8px;
  padding: 8px;
  min-height: 620px;
}

#chart {
  width: 100%;
  min-height: 604px;
}

.placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 13px;
  pointer-events: none;
}

/* -------- serp sidebar -------- */
.serp-sidebar {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  min-height: 200px;
  align-self: start;
}

.serp-sidebar h3 {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.link-list li { margin: 0; }

.link-list a {
  display: block;
  padding: 7px 10px;
  color: var(--text);
  text-decoration: none;
  border-radius: 6px;
  font-size: 13px;
  border: 1px solid transparent;
  transition: background 0.12s ease, border-color 0.12s ease;
}

.link-list a:hover {
  background: rgba(76, 141, 255, 0.08);
  border-color: var(--border);
}

.link-list a.active {
  background: rgba(76, 141, 255, 0.16);
  border-color: var(--accent);
  color: var(--text);
}

/* -------- misc -------- */
.muted { color: var(--muted); font-size: 12px; }

code {
  background: var(--panel-2);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12px;
}

.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 13px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  z-index: 9999;
  max-width: 400px;
}

.toast.error { border-left-color: var(--danger); }

/* -------- upload panel -------- */
.upload-panel {
  margin-top: 16px;
  border-radius: 10px;
}

.upload-panel h2 {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.upload-form {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
  align-items: end;
  margin-top: 10px;
}

.upload-form.one-line {
  padding-top: 10px;
  margin-top: 10px;
  border-top: 1px dashed var(--border);
}

.cache-panel {
  margin-top: 16px;
  border-radius: 10px;
}

.cache-panel h2 {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.cache-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.inline-label.files { flex: 1 1 260px; }

.inline-label input[type="date"],
.inline-label input[type="file"] {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 10px;
  font-size: 13px;
  outline: none;
}

.inline-label input[type="file"] {
  padding: 5px 10px;
}

.inline-label input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(0.85);
  cursor: pointer;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 16px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
}

.btn:hover { background: #2a3040; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}
.btn-primary:hover { background: var(--accent-2); border-color: var(--accent-2); }

@media (max-width: 900px) {
  .chart-layout {
    grid-template-columns: 1fr;
  }
}