:root {
  color-scheme: light dark;
  --bg: #eef2f9;
  --bg-accent: radial-gradient(1200px 480px at 15% -10%, #dbe8fb 0%, transparent 60%);
  --surface: #ffffff;
  --surface-muted: #f5f8fc;
  --border: #dde4ef;
  --text: #16233a;
  --text-muted: #5b6b84;
  --accent: #2063a8;
  --accent-strong: #154c85;
  --accent-soft: #e6f0fb;
  --accent-contrast: #ffffff;
  --success: #1c8a5a;
  --success-soft: #e4f6ed;
  --warning: #a16b0c;
  --warning-soft: #fcf1dc;
  --danger: #b6261b;
  --danger-soft: #fbe9e6;
  --shadow: 0 1px 2px rgba(16, 33, 58, .05), 0 16px 32px -18px rgba(16, 33, 58, .25);
  --shadow-sm: 0 1px 2px rgba(16, 33, 58, .08);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --font-sans: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1626;
    --bg-accent: radial-gradient(1200px 480px at 15% -10%, #16233b 0%, transparent 60%);
    --surface: #141f33;
    --surface-muted: #19263d;
    --border: #273655;
    --text: #e7ecf6;
    --text-muted: #96a4bf;
    --accent: #5fa2e6;
    --accent-strong: #86bdf2;
    --accent-soft: #1b2e4a;
    --accent-contrast: #0a1322;
    --success: #4fd39b;
    --success-soft: #11301f;
    --warning: #eab766;
    --warning-soft: #352609;
    --danger: #f3958e;
    --danger-soft: #371b16;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 18px 40px -18px rgba(0, 0, 0, .65);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .5);
  }
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  font: 16px/1.55 var(--font-sans);
  color: var(--text);
  background: var(--bg-accent), var(--bg);
  min-height: 100vh;
}

h1, h2, h3 { line-height: 1.2; font-weight: 650; letter-spacing: -0.01em; }
h1 { font-size: 26px; margin: 0 0 6px; }
h2 { font-size: 18px; margin: 0; display: flex; align-items: center; gap: 10px; }
h3 { font-size: 15px; margin: 0 0 6px; }
p { margin: 10px 0; }
small { color: var(--text-muted); }
a { color: var(--accent-strong); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; font-size: 15px; color: var(--text); }
.brand svg { flex: none; color: var(--accent); }

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-muted);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
}
.nav-link:hover { border-color: var(--accent); color: var(--accent-strong); text-decoration: none; }

main.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 20px 64px;
}

main.container.wide { max-width: 1180px; }

.lead { color: var(--text-muted); max-width: 640px; }

section {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 22px 24px;
  margin: 18px 0;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  flex: none;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 13px;
  font-weight: 700;
}

label { display: block; margin: 12px 0; font-size: 14.5px; }
label input[type="checkbox"], label input[type="radio"] { accent-color: var(--accent); margin-right: 8px; vertical-align: middle; }

input, select, textarea {
  font: inherit;
  padding: 9px 11px;
  max-width: 100%;
  box-sizing: border-box;
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
}
input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button {
  font: inherit;
  font-weight: 600;
  padding: 10px 16px;
  margin: 6px 8px 6px 0;
  cursor: pointer;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-muted);
  color: var(--text);
  transition: transform .05s ease, border-color .15s ease, background .15s ease, color .15s ease, box-shadow .15s ease;
}
button:hover { border-color: var(--accent); color: var(--accent-strong); }
button:active { transform: translateY(1px); }
button:disabled { cursor: default; opacity: .5; border-color: var(--border); color: var(--text-muted); }

button.primary, #start, #refresh, #loginButton, #refreshAdmin, #settingsForm button {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
  box-shadow: var(--shadow-sm);
}
button.primary:hover, #start:hover, #refresh:hover, #loginButton:hover, #refreshAdmin:hover, #settingsForm button:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: var(--accent-contrast);
}

#stop {
  background: var(--danger-soft);
  border-color: var(--danger);
  color: var(--danger);
}
#stop:hover { background: var(--danger); color: var(--accent-contrast); }

#shot {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-strong);
}

#applyCleanup { border-color: var(--warning); color: var(--warning); background: var(--warning-soft); }
#applyCleanup:hover { background: var(--warning); color: var(--accent-contrast); }

#logout { color: var(--text-muted); }

.banner {
  white-space: pre-wrap;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  color: var(--text);
  font-size: 14.5px;
}
.banner.banner-warning { border-left-color: var(--warning); background: var(--warning-soft); }
.banner.banner-muted { border-left-color: var(--border); background: var(--surface-muted); color: var(--text-muted); }

#levels { display: flex; gap: 24px; flex-wrap: wrap; margin-top: 14px; }
#levels label { margin: 0; font-size: 13.5px; color: var(--text-muted); display: flex; flex-direction: column; gap: 6px; }

meter { width: 180px; height: 10px; border-radius: 999px; }
meter::-webkit-meter-bar { background: var(--surface-muted); border: 1px solid var(--border); border-radius: 999px; }
meter::-webkit-meter-optimum-value { background: var(--accent); border-radius: 999px; }
meter::-moz-meter-bar { background: var(--accent); border-radius: 999px; }

video {
  width: 100%;
  max-height: 330px;
  background: #0b121e;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

audio { display: block; max-width: 100%; margin: 10px 0; }

#results article, #sessions article {
  border-top: 1px solid var(--border);
  padding: 16px 0;
}
#results article:first-child, #sessions article:first-child { border-top: none; padding-top: 4px; }
#results img { display: block; max-width: 100%; max-height: 240px; margin: 10px 0; border-radius: var(--radius-sm); border: 1px solid var(--border); }
#sessions h3 { font-weight: 600; color: var(--text); }
#sessions article p { color: var(--text-muted); font-size: 14.5px; margin: 6px 0; }

[hidden] { display: none !important; }
.scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-md); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
thead th {
  text-align: left;
  padding: 10px 12px;
  background: var(--surface-muted);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .03em;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}
td { text-align: left; border-bottom: 1px solid var(--border); padding: 10px 12px; vertical-align: top; overflow-wrap: anywhere; white-space: pre-wrap; }
tbody tr:hover { background: var(--surface-muted); }
.actions { min-width: 180px; }
.actions p { margin: 4px 0; }

#metrics { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 4px; }
#metrics p {
  margin: 0;
  background: var(--surface-muted);
  border: 1px solid var(--border);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
}

.hint { color: var(--text-muted); font-size: 14px; }
.transcript-layout { display: grid; grid-template-columns: minmax(220px, 1fr) minmax(300px, 2fr); gap: 20px; align-items: start; }
.screenshot-grid { display: grid; gap: 14px; }
.screenshot-button { display: block; width: 100%; text-align: left; white-space: normal; }
.screenshot-button img { display: block; width: 100%; max-height: 240px; object-fit: contain; margin-bottom: 8px; }
.transcript-segments { max-height: 75vh; overflow-y: auto; scroll-behavior: smooth; }
.transcript-segment { padding: 12px; border-radius: 8px; }
.transcript-segment.selected { background: var(--accent-soft); outline: 2px solid var(--accent); }
@media (max-width: 800px) { .transcript-layout { grid-template-columns: 1fr; } }
.page-info { color: var(--text-muted); font-size: 13.5px; margin: 10px 0 8px; }

.filters-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 16px;
}
.filters-row label { margin: 0; flex: 1 1 180px; }
.filters-row label.checkbox { flex: 0 0 auto; }

@media (max-width: 640px) {
  main.container { padding: 20px 14px 48px; }
  section { padding: 18px; }
  .topbar { padding: 12px 16px; }
}