/* Liquid Glass theme, inspired by Apple's design language.
   Translucent layers float over a vivid colour field; system colours carry meaning. */

:root {
  /* Apple system colours (light) */
  --blue: #007aff;
  --indigo: #5856d6;
  --purple: #af52de;
  --pink: #ff2d55;
  --orange: #ff9500;
  --green: #34c759;
  --teal: #30b0c7;
  --red: #ff3b30;
  --yellow: #ffcc00;

  --bg: #f2f2f7;
  --ink: #1d1d1f;
  --muted: rgba(60, 60, 67, .62);
  --hair: rgba(60, 60, 67, .14);

  /* Glass recipe */
  --glass: rgba(255, 255, 255, .52);
  --glass-strong: rgba(255, 255, 255, .72);
  --glass-well: rgba(255, 255, 255, .55);
  --glass-edge: rgba(255, 255, 255, .85);
  --glass-shade: rgba(255, 255, 255, .25);
  --shadow: 0 1px 1px rgba(0, 0, 0, .04), 0 12px 40px -12px rgba(31, 38, 135, .22);
  --blur: saturate(180%) blur(28px);

  --blob-1: #5ac8fa; --blob-2: #af52de; --blob-3: #ff2d55; --blob-4: #ffcc00;
  --blob-opacity: .55;

  --r-xl: 30px; --r-lg: 22px; --r-md: 16px;
  --ease: cubic-bezier(.2, .8, .2, 1);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --blue: #0a84ff;
    --indigo: #5e5ce6;
    --purple: #bf5af2;
    --pink: #ff375f;
    --orange: #ff9f0a;
    --green: #30d158;
    --teal: #40c8e0;
    --red: #ff453a;
    --yellow: #ffd60a;

    --bg: #000;
    --ink: #f5f5f7;
    --muted: rgba(235, 235, 245, .6);
    --hair: rgba(255, 255, 255, .1);

    --glass: rgba(40, 40, 48, .42);
    --glass-strong: rgba(44, 44, 52, .62);
    --glass-well: rgba(255, 255, 255, .06);
    --glass-edge: rgba(255, 255, 255, .28);
    --glass-shade: rgba(255, 255, 255, .04);
    --shadow: 0 1px 1px rgba(0, 0, 0, .3), 0 20px 50px -16px rgba(0, 0, 0, .7);

    --blob-1: #0a84ff; --blob-2: #bf5af2; --blob-3: #ff375f; --blob-4: #30d158;
    --blob-opacity: .45;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.47 -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  letter-spacing: -0.012em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- Colour field behind the glass ---------- */
.backdrop { position: fixed; inset: 0; z-index: 0; overflow: hidden; pointer-events: none; }
.backdrop i {
  position: absolute; display: block; border-radius: 50%;
  filter: blur(80px); opacity: var(--blob-opacity);
  animation: drift 26s var(--ease) infinite alternate;
}
.backdrop .b1 { width: 52vmax; height: 52vmax; left: -14vmax; top: -18vmax; background: var(--blob-1); }
.backdrop .b2 { width: 44vmax; height: 44vmax; right: -12vmax; top: 8vmax; background: var(--blob-2); animation-delay: -6s; }
.backdrop .b3 { width: 40vmax; height: 40vmax; left: 18vmax; bottom: -20vmax; background: var(--blob-3); animation-delay: -12s; }
.backdrop .b4 { width: 30vmax; height: 30vmax; right: 8vmax; bottom: -8vmax; background: var(--blob-4); animation-delay: -18s; opacity: calc(var(--blob-opacity) * .7); }
@keyframes drift {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(4vmax, 3vmax) scale(1.08); }
  100% { transform: translate(-3vmax, 5vmax) scale(.96); }
}

.wrap { position: relative; z-index: 1; max-width: 1140px; margin: 0 auto; padding: 44px 20px 56px; }

/* ---------- Glass surface ---------- */
.card, .btn, select, #toast, .verdict, .tag {
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
}
.card {
  position: relative;
  background: linear-gradient(160deg, var(--glass-strong), var(--glass) 55%);
  border: 1px solid var(--glass-edge);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow), inset 0 1px 0 var(--glass-edge), inset 0 -1px 0 var(--glass-shade);
  padding: 26px;
  margin-bottom: 18px;
}
/* Specular highlight along the top edge */
.card::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: radial-gradient(120% 60% at 20% 0%, rgba(255, 255, 255, .35), transparent 60%);
  mix-blend-mode: soft-light;
}
.card > * { position: relative; }

/* ---------- Header ---------- */
.top { display: flex; flex-wrap: wrap; gap: 20px; align-items: flex-end; justify-content: space-between; margin-bottom: 30px; }
h1 {
  font-size: clamp(32px, 5vw, 52px); line-height: 1.05; margin: 0 0 10px;
  font-weight: 700; letter-spacing: -0.035em;
  background: linear-gradient(95deg, var(--blue), var(--purple) 45%, var(--pink) 80%, var(--orange));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.sub { margin: 0; color: var(--muted); font-size: 19px; max-width: 34em; }
.actions { display: flex; gap: 10px; align-items: center; }

select, .btn {
  font: inherit; font-size: 15px; font-weight: 600; height: 44px; border-radius: 999px;
  padding: 0 20px; cursor: pointer; color: var(--ink);
  background: var(--glass-strong);
  border: 1px solid var(--glass-edge);
  box-shadow: 0 6px 20px -8px rgba(0, 0, 0, .25), inset 0 1px 0 var(--glass-edge);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), filter .25s var(--ease);
}
select { padding-right: 16px; }
.btn:hover, select:hover { transform: translateY(-1px); filter: brightness(1.04); }
.btn:active { transform: scale(.96); }
.btn.primary {
  color: #fff; border-color: rgba(255, 255, 255, .35);
  background: linear-gradient(135deg, var(--blue), var(--indigo) 55%, var(--purple));
  box-shadow: 0 10px 28px -8px color-mix(in srgb, var(--blue) 70%, transparent), inset 0 1px 0 rgba(255, 255, 255, .45);
}
:focus-visible { outline: 3px solid color-mix(in srgb, var(--blue) 60%, transparent); outline-offset: 3px; }

/* ---------- Section titles ---------- */
h2 { font-size: 21px; font-weight: 700; letter-spacing: -0.02em; margin: 0 0 18px; display: flex; align-items: center; gap: 12px; }
.dot { width: 30px; height: 30px; border-radius: 10px; display: inline-block; box-shadow: inset 0 1px 0 rgba(255, 255, 255, .5), 0 6px 14px -6px currentColor; }
.dot.g { background: linear-gradient(135deg, #34aadc, var(--blue)); color: var(--blue); }
.dot.m { background: linear-gradient(135deg, var(--purple), var(--pink)); color: var(--purple); }
.ch-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }

.channels { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 18px; }
.channels .card { margin-bottom: 0; }
form { margin-bottom: 18px; }

/* Channel tint: a soft coloured glow inside each glass panel */
.channel[data-ch="g"] { background: linear-gradient(160deg, color-mix(in srgb, var(--blue) 14%, var(--glass-strong)), var(--glass) 60%); }
.channel[data-ch="m"] { background: linear-gradient(160deg, color-mix(in srgb, var(--purple) 14%, var(--glass-strong)), var(--glass) 60%); }
.total { background: linear-gradient(160deg, color-mix(in srgb, var(--green) 12%, var(--glass-strong)), var(--glass) 60%); }

/* ---------- Fields ---------- */
.grid-3 { display: grid; align-items: end; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; }
.grid-2 { display: grid; align-items: end; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 14px 16px; }
.field { display: flex; flex-direction: column; gap: 7px; font-size: 14px; font-weight: 600; }
.field small { font-weight: 400; color: var(--muted); font-size: 13px; }
.input {
  display: flex; align-items: center; padding: 0 16px; border-radius: var(--r-md);
  background: var(--glass-well);
  border: 1px solid var(--hair);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, .06);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease);
}
.input:hover { border-color: color-mix(in srgb, var(--blue) 30%, var(--hair)); }
.input:focus-within {
  background: var(--glass-strong);
  border-color: var(--blue);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--blue) 22%, transparent);
}
.input em { font-style: normal; color: var(--muted); font-weight: 500; }
.input.money em { margin-right: 5px; }
.input.pct em { margin-left: 5px; }
.input input {
  flex: 1; min-width: 0; border: 0; background: transparent; color: var(--ink);
  font: inherit; font-size: 19px; font-weight: 600; height: 48px; padding: 0; outline: none;
  font-variant-numeric: tabular-nums; letter-spacing: -0.01em;
}
.input input::-webkit-outer-spin-button, .input input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.input input[type=number] { -moz-appearance: textfield; appearance: textfield; }

/* ---------- KPI tiles ---------- */
.kpis { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; margin-top: 22px; }
.kpis.wide { grid-template-columns: repeat(6, minmax(0,1fr)); margin-top: 4px; }
.kpi {
  --c: var(--blue);
  position: relative; overflow: hidden; min-width: 0;
  padding: 14px 16px 16px; border-radius: var(--r-lg);
  background: linear-gradient(150deg, color-mix(in srgb, var(--c) 16%, transparent), color-mix(in srgb, var(--c) 4%, transparent));
  border: 1px solid color-mix(in srgb, var(--c) 22%, var(--hair));
  box-shadow: inset 0 1px 0 var(--glass-edge);
}
.kpi span { display: block; font-size: 13px; color: var(--muted); font-weight: 600; }
.kpi small { font-weight: 400; }
.kpi strong {
  display: block; margin-top: 2px; font-size: 30px; font-weight: 700; letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  background: linear-gradient(120deg, var(--c), color-mix(in srgb, var(--c) 60%, var(--ink)));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
/* One system colour per metric so they are scannable at a glance */
.kpis .kpi:nth-child(1) { --c: var(--blue); }
.kpis .kpi:nth-child(2) { --c: var(--green); }
.kpis .kpi:nth-child(3) { --c: var(--orange); }
.kpis .kpi:nth-child(4) { --c: var(--pink); }
.kpis .kpi:nth-child(5) { --c: var(--purple); }
.kpis .kpi:nth-child(6) { --c: var(--teal); }
.kpis.wide .kpi strong { font-size: 26px; }

.funnel { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 4px 18px; margin: 18px 0 0; font-size: 14px; }
.funnel div { display: flex; justify-content: space-between; gap: 8px; border-bottom: 1px solid var(--hair); padding: 7px 0; }
.funnel dt { color: var(--muted); }
.funnel dd { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; }

/* ---------- Verdict pills ---------- */
.verdict:empty { display: none; }
.verdict, .tag {
  --c: var(--green);
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 700; padding: 6px 12px; border-radius: 999px; white-space: nowrap;
  color: color-mix(in srgb, var(--c) 78%, var(--ink));
  background: color-mix(in srgb, var(--c) 18%, var(--glass-strong));
  border: 1px solid color-mix(in srgb, var(--c) 35%, transparent);
  box-shadow: 0 4px 14px -6px var(--c), inset 0 1px 0 var(--glass-edge);
}
.verdict::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--c); box-shadow: 0 0 8px var(--c); }
.ok { --c: var(--green); }
.warn { --c: var(--orange); }
.bad { --c: var(--red); }

.next {
  margin: 18px 0 0; font-size: 17px; font-weight: 500; padding: 14px 18px; border-radius: var(--r-md);
  background: var(--glass-well); border: 1px solid var(--hair);
}
.next:empty { display: none; }

/* ---------- Explainer ---------- */
.how { padding: 20px 26px; }
.how summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; align-items: center; gap: 10px; }
.how summary::-webkit-details-marker { display: none; }
.how summary::before {
  content: "›"; display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%;
  background: var(--glass-well); border: 1px solid var(--hair); font-size: 18px; line-height: 1;
  transition: transform .25s var(--ease);
}
.how[open] summary::before { transform: rotate(90deg); }
.how ul { padding-left: 20px; margin: 16px 0; }
.how li { margin-bottom: 9px; }
.how .tag { padding: 2px 10px; font-size: 12px; }
.muted { color: var(--muted); margin: 0; font-size: 15px; }
.foot { text-align: center; color: var(--muted); font-size: 14px; margin-top: 28px; }

/* ---------- Toast ---------- */
#toast {
  position: fixed; z-index: 10; left: 50%; bottom: 28px; transform: translate(-50%, 24px) scale(.96);
  background: var(--glass-strong); color: var(--ink); border: 1px solid var(--glass-edge);
  padding: 12px 20px; border-radius: 999px; box-shadow: var(--shadow);
  font-size: 15px; font-weight: 600; opacity: 0; pointer-events: none;
  transition: .35s var(--ease); max-width: calc(100% - 32px); word-break: break-all;
}
#toast.show { opacity: 1; transform: translate(-50%, 0) scale(1); }

/* ---------- Fallbacks and preferences ---------- */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  :root { --glass: rgba(255, 255, 255, .9); --glass-strong: rgba(255, 255, 255, .96); }
  @media (prefers-color-scheme: dark) { :root { --glass: rgba(28, 28, 30, .92); --glass-strong: rgba(44, 44, 46, .96); } }
}
@media (prefers-reduced-motion: reduce) {
  .backdrop i { animation: none; }
  * { transition: none !important; }
}
@media (prefers-reduced-transparency: reduce) {
  :root { --glass: var(--bg); --glass-strong: var(--bg); }
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .kpis.wide { grid-template-columns: repeat(3, minmax(0,1fr)); }
}
@media (max-width: 860px) {
  .channels { grid-template-columns: minmax(0,1fr); }
}
@media (max-width: 560px) {
  .wrap { padding: 26px 16px 40px; }
  .grid-3 { grid-template-columns: minmax(0,1fr) minmax(0,1fr); }
  .grid-3 .field:first-child { grid-column: 1 / -1; }
  .kpis, .kpis.wide { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .kpi strong, .kpis.wide .kpi strong { font-size: 24px; }
  .funnel { grid-template-columns: minmax(0,1fr) minmax(0,1fr); }
  .card { padding: 20px; border-radius: 26px; }
  .actions { width: 100%; }
  .actions .btn { flex: 1; }
}
@media print {
  .backdrop, .actions, #toast { display: none; }
  .card { break-inside: avoid; box-shadow: none; }
}