/* ─────────────────────────  reset & base  ───────────────────────── */
*,*::before,*::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, "Apple Color Emoji", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  color: #e9ecf2;
  background: #0b0d12;
  -webkit-font-smoothing: antialiased;
}

:root {
  --bg: #0b0d12;
  --panel: #141821;
  --panel-2: #1a1f2b;
  --line: #242a38;
  --text: #e9ecf2;
  --muted: #8a93a6;
  --accent: #ff3b3b;          /* YouTube-ish red, used sparingly */
  --accent-2: #5b8cff;        /* informational blue */
  --good: #2ecc71;
  --warn: #f5b14c;
  --bad: #ff5c5c;
  --shadow: 0 6px 30px rgba(0,0,0,.35);
  --radius: 14px;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* ─────────────────────────  hero  ───────────────────────── */
.hero {
  padding: 56px 0 36px;
  background:
    radial-gradient(1200px 400px at 80% -10%, rgba(255,59,59,.18), transparent 60%),
    radial-gradient(800px 300px at 10% 10%, rgba(91,140,255,.12), transparent 60%),
    linear-gradient(180deg, #10131b 0%, #0b0d12 100%);
  border-bottom: 1px solid var(--line);
}
.kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 6px 10px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(28px, 4.4vw, 56px);
  line-height: 1.05;
  margin: 0 0 16px;
  letter-spacing: -.02em;
}
.lede {
  max-width: 760px;
  color: #c8cee0;
  font-size: clamp(15px, 1.4vw, 18px);
}
.lede strong { color: #fff; }
.hero-cta { margin-top: 22px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 11px 16px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .1s ease, background .15s, border-color .15s;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: #ff5252; }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn.ghost:hover { border-color: #3a4358; }

/* ─────────────────────────  presets  ───────────────────────── */
.presets {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 28px 0 8px;
}
.preset-label { color: var(--muted); font-size: 14px; }
.preset-buttons { display: flex; gap: 8px; flex-wrap: wrap; }
.preset-buttons button {
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  transition: border-color .15s, background .15s;
}
.preset-buttons button:hover { border-color: #3a4358; }
.preset-buttons button.active { background: rgba(91,140,255,.12); border-color: var(--accent-2); color: #cfd9ff; }

.share-btn {
  margin-left: auto;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: border-color .15s, background .15s, color .15s;
}
.share-btn:hover  { border-color: #3a4358; }
.share-btn.copied { background: rgba(46,204,113,.12); color: #5fe39a; border-color: rgba(46,204,113,.3); }
.share-ico { font-size: 13px; }

/* ─────────────────────────  channel picker  ───────────────────────── */
.channels-row {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 10px 14px;
  padding: 14px 0 4px;
  border-top: 1px solid var(--line);
  margin-top: 14px;
}
.channels-row .cp-label { color: var(--muted); font-size: 14px; white-space: nowrap; }
.channels-row select {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 14px;
  max-width: 360px;
}
.channels-row .cp-hint {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.5;
}
.channels-row .cp-hint em { color: #cfd5e3; font-style: normal; }
.channel-info {
  grid-column: 1 / -1;
  margin-top: 6px;
  padding: 14px 16px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 13.5px;
}
.channel-info.hidden { display: none; }
.ci-head { margin-bottom: 8px; font-size: 15px; color: #fff; }
.ci-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 8px 0;
}
.ci-stats > div {
  background: var(--panel);
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
}
.ci-stats strong { font-size: 16px; color: #fff; }
.ci-note {
  margin-top: 8px;
  padding: 8px 10px;
  border-left: 2px solid var(--accent-2);
  background: rgba(91,140,255,.06);
  color: #c8cee0;
  font-size: 12.5px;
  border-radius: 0 6px 6px 0;
}
.ci-disclaimer {
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}
@media (max-width: 720px) {
  .channels-row { grid-template-columns: 1fr; }
  .ci-stats { grid-template-columns: 1fr 1fr; }
}

/* ─────────────────────────  layout  ───────────────────────── */
.calc { padding-bottom: 80px; }
.layout {
  display: grid;
  grid-template-columns: 420px 1fr;
  grid-template-areas:
    "inputs verdict"
    "inputs outputs";
  align-items: start;
  gap: 24px;
  margin-top: 16px;
}
.inputs      { grid-area: inputs; }
.verdict-row { grid-area: verdict; }
.outputs     { grid-area: outputs; }

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-areas:
      "verdict"
      "inputs"
      "outputs";
  }
  .inputs { position: static !important; max-height: none; overflow: visible; }
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
}
.card + .card { margin-top: 20px; }

/* ─────────────────────────  inputs  ───────────────────────── */
.inputs {
  position: sticky;
  top: 16px;
  height: fit-content;
  max-height: calc(100vh - 32px);
  overflow: auto;
}
.inputs h2 { margin: 4px 0 14px; font-size: 18px; }
.inputs h3 {
  margin: 18px 0 6px;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 14px;
}
.inputs h3:first-of-type { border-top: 0; padding-top: 0; }

.group { display: flex; flex-direction: column; }

.row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 6px 12px;
  padding: 9px 0;
}
.row .lbl {
  grid-column: 1 / -1;
  font-size: 13.5px;
  color: #d5dae6;
}
.row .lbl small { color: var(--muted); font-size: 12px; font-weight: 400; }
.row input[type=range] {
  grid-column: 1;
  width: 100%;
}
.row output {
  grid-column: 2;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: 13.5px;
  color: #fff;
  min-width: 90px;
  text-align: right;
}
.row .numwrap {
  grid-column: 2;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 8px;
  font-variant-numeric: tabular-nums;
  transition: border-color .15s;
}
.row .numwrap:focus-within { border-color: var(--accent-2); }
.row .numwrap .prefix,
.row .numwrap .suffix {
  color: var(--muted);
  font-size: 12px;
  user-select: none;
}
.row .numwrap input.num {
  background: transparent;
  border: 0;
  outline: none;
  color: #fff;
  font: inherit;
  font-weight: 600;
  font-size: 13.5px;
  width: 84px;
  padding: 5px 0;
  text-align: right;
  -moz-appearance: textfield;
  appearance: textfield;
}
.row .numwrap input.num::-webkit-outer-spin-button,
.row .numwrap input.num::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.row.select, .row.check {
  grid-template-columns: 1fr auto;
}
.row.select .lbl, .row.check .lbl { grid-column: 1; }
.row.select select {
  grid-column: 2;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 8px;
  font-size: 13px;
}
.row.check input { grid-column: 2; width: 18px; height: 18px; accent-color: var(--accent-2); }

/* range styling */
input[type=range] {
  -webkit-appearance: none;
  background: transparent;
  height: 22px;
}
input[type=range]::-webkit-slider-runnable-track {
  height: 6px;
  background: linear-gradient(90deg, var(--accent-2) 0%, var(--accent-2) var(--p,0%), #2a3142 var(--p,0%), #2a3142 100%);
  border-radius: 999px;
}
input[type=range]::-moz-range-track {
  height: 6px;
  background: #2a3142;
  border-radius: 999px;
}
input[type=range]::-moz-range-progress {
  height: 6px;
  background: var(--accent-2);
  border-radius: 999px;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  background: #fff;
  border-radius: 50%;
  margin-top: -6px;
  box-shadow: 0 2px 8px rgba(0,0,0,.45), 0 0 0 2px var(--accent-2);
  cursor: pointer;
}
input[type=range]::-moz-range-thumb {
  width: 18px; height: 18px;
  background: #fff;
  border: none;
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0,0,0,.45), 0 0 0 2px var(--accent-2);
  cursor: pointer;
}

/* ─────────────────────────  verdict  ───────────────────────── */
.verdict { padding: 22px 24px; }
.verdict-headline {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
}
.verdict-sub {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
@media (max-width: 560px) {
  .verdict-sub { grid-template-columns: 1fr 1fr; }
}
.big {
  font-size: clamp(36px, 5.5vw, 56px);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
}
.med {
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.muted { color: var(--muted); font-size: 13px; }
.muted.small { font-size: 12px; }
.badge {
  align-self: stretch;
  padding: 14px 18px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 14px;
  text-align: center;
  min-width: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1.3;
}
.badge.bad   { background: rgba(255, 92, 92, .12);  color: #ff8c8c; border: 1px solid rgba(255,92,92,.3); }
.badge.warn  { background: rgba(245, 177, 76, .12); color: #f6c374; border: 1px solid rgba(245,177,76,.3); }
.badge.good  { background: rgba(46, 204, 113, .12); color: #5fe39a; border: 1px solid rgba(46,204,113,.3); }

@media (max-width: 640px) {
  .verdict { padding: 16px 18px; }
  .verdict-headline {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .big { font-size: clamp(28px, 9vw, 40px); white-space: nowrap; }
  .badge {
    min-width: 0;
    width: 100%;
    padding: 10px 14px;
    font-size: 13px;
  }
  .verdict-sub { grid-template-columns: 1fr 1fr; gap: 12px; }
  .med { font-size: 18px; }
}

.verdict-line {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 10px;
  background: rgba(91,140,255,.07);
  border: 1px solid rgba(91,140,255,.18);
  font-size: 14px;
  color: #d5dae6;
  line-height: 1.5;
}
.verdict-line strong { color: #fff; }

/* ─────────────────────────  charts  ───────────────────────── */
.chartwrap { position: relative; height: 240px; margin: 6px 0 8px; }
.chartwrap.tall { height: 320px; }

/* breakdown table */
.breakdown {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 13.5px;
}
.breakdown th, .breakdown td {
  padding: 7px 8px;
  text-align: right;
  border-top: 1px solid var(--line);
  font-variant-numeric: tabular-nums;
}
.breakdown th:first-child, .breakdown td:first-child { text-align: left; }
.breakdown tr.total td { font-weight: 700; border-top: 1px solid #344056; }
.breakdown tr.neg td.amt { color: #ff8c8c; }
.breakdown tr.pos td.amt { color: #5fe39a; }

/* ─────────────────────────  prose & footer  ───────────────────────── */
.prose { margin-top: 32px; }
.prose h2 { margin-top: 0; }
.prose h3 { margin-top: 22px; }
.prose ul { padding-left: 20px; }
.prose li { margin: 4px 0; color: #c8cee0; }

.note {
  margin-top: 10px;
  font-size: 13.5px;
  color: #cfd5e3;
  background: rgba(91,140,255,.07);
  border: 1px solid rgba(91,140,255,.18);
  padding: 10px 12px;
  border-radius: 10px;
}

.foot {
  margin-top: 60px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13.5px;
}
.foot p { margin: 6px 0; }