:root {
  --bg: #f5f6f3;
  --surface: #ffffff;
  --surface-2: #eef1ec;
  --text: #17201e;
  --muted: #5b6763;
  --border: #d5dbd5;
  --accent: #1d6b63;
  --accent-hover: #175850;
  --accent-text: #ffffff;
  --focus: #0b57d0;
  --error: #a33a2e;
  --warn-bg: #fbf5e1;
  --warn-border: #e7d9a6;
  --mark-bg: #cdeed6;
  --mark-text: #0d3a22;
  --radius: 12px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #101412;
    --surface: #171c1a;
    --surface-2: #1d2421;
    --text: #e8ece9;
    --muted: #9ea9a4;
    --border: #2c3532;
    --accent: #6cc3b8;
    --accent-hover: #86d2c9;
    --accent-text: #0b1a18;
    --focus: #8ab4f8;
    --error: #f08a7e;
    --warn-bg: #2a2716;
    --warn-border: #5b5227;
    --mark-bg: #1f4a31;
    --mark-text: #d8f5e2;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #101412;
  --surface: #171c1a;
  --surface-2: #1d2421;
  --text: #e8ece9;
  --muted: #9ea9a4;
  --border: #2c3532;
  --accent: #6cc3b8;
  --accent-hover: #86d2c9;
  --accent-text: #0b1a18;
  --focus: #8ab4f8;
  --error: #f08a7e;
  --warn-bg: #2a2716;
  --warn-border: #5b5227;
  --mark-bg: #1f4a31;
  --mark-text: #d8f5e2;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
[hidden] { display: none !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.row { display: flex; align-items: center; flex-wrap: wrap; }
.between { justify-content: space-between; }
.gap { gap: 8px; }
.small { font-size: 0.875rem; }
.muted { color: var(--muted); }
.error { color: var(--error); margin: 0; min-height: 0; }
.error:empty { display: none; }

/* Top bar */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px; border-bottom: 1px solid var(--border); background: var(--surface);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.brand-mark { width: 26px; height: 26px; color: var(--accent); }
.top-right { display: flex; align-items: center; gap: 10px; }
.badge { font-size: 0.75rem; color: var(--muted); border: 1px solid var(--border); border-radius: 999px; padding: 2px 10px; }
.icon-btn {
  width: 40px; height: 40px; padding: 0; display: inline-grid; place-items: center;
  border-radius: 10px; border: 1px solid var(--border); background: var(--surface); color: var(--text); cursor: pointer;
}
.icon-btn svg { width: 20px; height: 20px; }

/* App shell: icon rail + stage */
.app { flex: 1; display: grid; grid-template-columns: 76px minmax(0, 1fr); }
.rail {
  display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 14px 8px;
  border-right: 1px solid var(--border); background: var(--surface);
}
.rail-item {
  display: flex; flex-direction: column; align-items: center; gap: 4px; width: 100%;
  padding: 10px 4px; border-radius: 10px; color: var(--muted); text-decoration: none; font-size: 0.72rem;
}
.rail-item svg { width: 24px; height: 24px; }
.rail-item[aria-current="page"] { color: var(--accent); background: var(--surface-2); font-weight: 600; }
.rail-item:hover { color: var(--text); }

.stage { min-width: 0; padding: 20px 20px 8px; max-width: 1280px; width: 100%; margin: 0 auto; }
.intro { padding: 4px 0 14px; }
.intro h1 { font-size: 1.5rem; line-height: 1.25; margin: 0 0 4px; letter-spacing: -0.015em; }
.intro p { margin: 0; color: var(--muted); max-width: 72ch; font-size: 0.95rem; }

/* Controls */
.toolbar {
  display: grid; gap: 14px; padding: 14px 16px; margin-bottom: 14px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
@media (min-width: 720px) { .toolbar { grid-template-columns: minmax(200px, 260px) minmax(0, 1fr); align-items: end; } }
.control { display: grid; gap: 6px; min-width: 0; }
.control > label, .level label { font-size: 0.8rem; font-weight: 600; color: var(--muted); }
select {
  font: inherit; color: var(--text); background: var(--bg); min-height: 42px;
  border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; width: 100%;
}
.level-value { font-size: 0.8rem; font-weight: 600; color: var(--accent); }
input[type="range"] { width: 100%; accent-color: var(--accent); margin: 6px 0 0; min-height: 28px; }
.scale { display: flex; justify-content: space-between; font-size: 0.75rem; color: var(--muted); }

/* Panels */
.workspace { display: grid; gap: 14px; }
@media (min-width: 900px) { .workspace { grid-template-columns: 1fr 1fr; } }
.panel {
  display: flex; flex-direction: column; gap: 10px; min-width: 0; min-height: 440px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px;
}
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 36px; }
.panel-head h3 { font-size: 1rem; margin: 0; }
.panel-foot { display: flex; align-items: center; justify-content: flex-end; gap: 10px; flex-wrap: wrap; margin-top: auto; }
.panel-foot.between { justify-content: space-between; }

textarea {
  width: 100%; flex: 1; min-height: 300px; resize: vertical; padding: 14px;
  font: inherit; font-size: 1rem; line-height: 1.6; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 10px;
}

.meter-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
progress {
  width: 120px; height: 6px; appearance: none; -webkit-appearance: none; border: 0; border-radius: 999px; overflow: hidden;
  background: var(--surface-2);
}
progress::-webkit-progress-bar { background: var(--surface-2); }
progress::-webkit-progress-value { background: var(--accent); }
progress::-moz-progress-bar { background: var(--accent); }
#counts { margin-left: auto; }

button {
  font: inherit; font-size: 0.9rem; border-radius: 8px; padding: 8px 14px; cursor: pointer;
  border: 1px solid var(--border); background: var(--surface); color: var(--text); min-height: 42px;
}
button:disabled { opacity: 0.5; cursor: not-allowed; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; padding: 10px 24px; }
button.primary:not(:disabled):hover { background: var(--accent-hover); }
button.ghost { background: transparent; }

/* Output */
.legend { display: inline-flex; align-items: center; gap: 6px; }
.chg { background: var(--mark-bg); color: var(--mark-text); border-radius: 4px; padding: 0 2px; }
.output-body { flex: 1; min-height: 260px; }
.output, .empty, .loading { padding: 4px 2px; }
.output {
  white-space: pre-wrap; overflow-wrap: anywhere; font-size: 1rem; line-height: 1.7;
  max-height: 520px; overflow: auto; outline: none;
}
.empty { color: var(--muted); }
.empty.error { color: var(--error); }
.loading { display: flex; align-items: center; gap: 10px; color: var(--muted); }
.spinner {
  width: 16px; height: 16px; flex: none; border-radius: 50%;
  border: 2px solid var(--border); border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; } }

.status {
  background: var(--warn-bg); border: 1px solid var(--warn-border); border-radius: 10px;
  padding: 10px 12px; font-size: 0.9rem;
}
.status strong { display: block; margin-bottom: 2px; }
.status ul { margin: 6px 0 0; padding-left: 20px; }

/* Notice and footer */
.notice { margin: 18px 0 24px; font-size: 0.9rem; color: var(--muted); }
.notice summary { cursor: pointer; font-weight: 600; color: var(--text); padding: 6px 0; }
.notice p { margin: 6px 0; }
.footer { padding: 14px 20px 24px; border-top: 1px solid var(--border); text-align: center; }

/* Phone: the rail becomes a horizontal strip above the stage */
@media (max-width: 719px) {
  .topbar { padding: 10px 14px; }
  .app { grid-template-columns: 1fr; }
  .rail {
    flex-direction: row; justify-content: flex-start; padding: 6px 14px;
    border-right: 0; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 2;
  }
  .rail-item { flex-direction: row; width: auto; padding: 8px 12px; font-size: 0.875rem; }
  .stage { padding: 16px 16px 4px; }
  .intro h1 { font-size: 1.3rem; }
  .panel { min-height: 0; }
  textarea { min-height: 220px; }
  .output-body { min-height: 180px; }
}

/* ---- Landing page sections ------------------------------------------------------------- */
.top-links { display: flex; gap: 18px; margin-left: auto; margin-right: 18px; }
.top-links a { color: var(--muted); text-decoration: none; font-size: 0.9rem; }
.top-links a:hover { color: var(--text); }

.hero { padding: 28px 0 22px; max-width: 760px; }
.eyebrow { margin: 0 0 8px; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); }
.hero h1 { font-size: clamp(1.6rem, 3.2vw, 2.4rem); line-height: 1.18; margin: 0 0 12px; letter-spacing: -0.02em; }
.lead { font-size: 1.05rem; color: var(--muted); margin: 0 0 16px; max-width: 64ch; }
.chips { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; }
.chips li {
  font-size: 0.85rem; padding: 6px 12px; border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--border);
}

.tool-section { margin-top: 8px; }
.section-title { font-size: 1.25rem; margin: 0 0 12px; letter-spacing: -0.01em; }
.content-section { margin-top: 44px; }

.steps {
  list-style: none; margin: 0; padding: 0; display: grid; gap: 14px;
}
@media (min-width: 720px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.steps li {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 18px 16px;
}
.step-num {
  display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent); color: var(--accent-text); font-weight: 700; font-size: 0.85rem; margin-bottom: 10px;
}
.steps h3 { font-size: 1rem; margin: 0 0 6px; }
.steps p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.two-col { display: grid; gap: 16px; }
@media (min-width: 900px) { .two-col { grid-template-columns: 1fr 1fr; gap: 24px; } }
.checklist { margin: 0 0 10px; padding-left: 20px; }
.checklist li { margin: 0 0 6px; }
.honest-card {
  background: var(--warn-bg); border: 1px solid var(--warn-border); border-radius: var(--radius); padding: 16px 18px;
}
.honest-card .section-title { font-size: 1.05rem; }

.detect-panel {
  margin-top: 16px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px 18px;
}
.detect-panel .panel-head { margin-bottom: 10px; }
.level-pill {
  font-size: 0.85rem; font-weight: 600; padding: 3px 10px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--bg);
}

.faq {
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  padding: 0 16px; margin: 0 0 10px;
}
.faq summary { cursor: pointer; font-weight: 600; padding: 14px 0; list-style-position: outside; }
.faq p { margin: 0 0 14px; color: var(--muted); }

@media (max-width: 719px) {
  .top-links { display: none; }
  .hero { padding: 18px 0 14px; }
  .content-section { margin-top: 32px; }
}