:root {
  --bg: #111111;
  --accent: #888888;
  --on-accent: #111111;
  --text: #eeeeee;
  --font: system-ui, sans-serif;
  --line: color-mix(in srgb, var(--text) 16%, transparent);
  --line-strong: color-mix(in srgb, var(--text) 32%, transparent);
  --muted: color-mix(in srgb, var(--text) 62%, transparent);
  --surface: color-mix(in srgb, var(--text) 5%, transparent);
  --surface-strong: color-mix(in srgb, var(--text) 10%, transparent);
  --radius: 16px;
  color-scheme: light dark;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.55;
  transition: background 0.8s ease, color 0.8s ease;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: color-mix(in srgb, var(--accent) 45%, transparent);
}

.hero,
main {
  max-width: 780px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 0;
}

/* ---- Barra superior ------------------------------------------------------ */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  max-width: 780px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 0;
}

.topbar-brand {
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-decoration: none;
  text-transform: uppercase;
}

.topbar-brand span {
  color: var(--accent);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.topbar-link {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--text);
  font-size: 0.76rem;
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.topbar-link:hover {
  border-color: var(--accent);
  background: var(--surface);
}

.topbar-link.lang {
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.06em;
}

main {
  padding-top: 0;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.75rem;
  font-weight: 600;
}

.eyebrow.small {
  font-size: 0.65rem;
  opacity: 0.85;
}

h1 {
  margin: 0.3rem 0 0.7rem;
  font-size: clamp(2.1rem, 6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.lead {
  max-width: 58ch;
  margin: 0;
  color: var(--muted);
}

.scan-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.6rem;
  margin: 1.7rem 0 0;
}

.scan-form input {
  min-width: 0;
  padding: 0.72rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.scan-form input::placeholder {
  color: color-mix(in srgb, var(--text) 38%, transparent);
}

.scan-form input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

.scan-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.72rem 1.3rem;
  border: 0;
  border-radius: 12px;
  background: var(--accent);
  color: var(--on-accent);
  font: inherit;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: filter 0.2s ease, opacity 0.2s ease;
}

.scan-form button:hover:not(:disabled) {
  filter: brightness(1.1);
}

.scan-form button:disabled {
  opacity: 0.55;
  cursor: wait;
}

.spinner {
  display: none;
  width: 0.85em;
  height: 0.85em;
  border: 2px solid color-mix(in srgb, currentColor 30%, transparent);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.scan-form[aria-busy="true"] .spinner {
  display: inline-block;
}

.scan-hint {
  margin: 0.7rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

/* ---- Panel de análisis --------------------------------------------------- */

.analysis {
  margin: 1.2rem 0 0;
  padding: 1rem 1.15rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(color-mix(in srgb, var(--accent) 8%, transparent), transparent 70%),
    var(--surface);
  animation: reveal 0.35s ease both;
}

.analysis.is-done {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
}

.analysis.is-error {
  border-color: color-mix(in srgb, #e5484d 60%, var(--line));
}

.analysis-head {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.analysis-copy {
  flex: 1 1 12rem;
  min-width: 0;
}

.analysis-step {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 600;
}

.analysis-sub {
  margin: 0.15rem 0 0;
  min-height: 1.2em;
  color: var(--muted);
  font-size: 0.78rem;
}

.analysis-pulse {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 18px;
  padding-top: 2px;
  color: var(--accent);
}

.analysis-pulse span {
  width: 3px;
  height: 5px;
  border-radius: 2px;
  background: currentColor;
  animation: pulse 0.9s ease-in-out infinite alternate;
}

.analysis-pulse span:nth-child(2) { animation-delay: -0.3s; }
.analysis-pulse span:nth-child(3) { animation-delay: -0.6s; }
.analysis-pulse span:nth-child(4) { animation-delay: -0.15s; }

.analysis.is-done .analysis-pulse span {
  height: 14px;
  animation-play-state: paused;
}

.analysis.is-error .analysis-pulse {
  color: #e5484d;
  opacity: 0.6;
}

.analysis.is-error .analysis-pulse span {
  animation-play-state: paused;
  height: 5px;
}

.analysis-steps {
  display: flex;
  flex-direction: column;
  gap: 0.32rem;
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
}

.analysis-steps li {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: color-mix(in srgb, var(--text) 42%, transparent);
  transition: color 0.2s ease;
}

.analysis-steps li::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--text) 30%, transparent);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.analysis-steps li[data-state="active"] {
  color: var(--text);
}

.analysis-steps li[data-state="active"]::before {
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 20%, transparent);
  animation: dot 1.1s ease-in-out infinite;
}

.analysis-steps li[data-state="done"] {
  color: var(--muted);
}

.analysis-steps li[data-state="done"]::before {
  background: var(--accent);
}

.analysis-track {
  overflow: hidden;
  height: 3px;
  margin-top: 0.95rem;
  border-radius: 999px;
  background: var(--surface-strong);
}

.analysis-progress {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 0.18s linear, background 0.3s ease;
}

.analysis.is-error .analysis-progress {
  background: #e5484d;
}

/* ---- Botones auxiliares -------------------------------------------------- */

.ghost {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  font-size: 0.78rem;
  white-space: nowrap;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, opacity 0.2s ease;
}

.ghost:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--surface);
}

.ghost:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ---- Presets y reproductor ---------------------------------------------- */

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1.9rem 0 1.3rem;
}

button {
  font: inherit;
  cursor: pointer;
}

.preset {
  padding: 0.55rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  font-size: 0.85rem;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.preset:hover {
  border-color: var(--accent);
  background: var(--surface);
}

.preset[aria-checked="true"] {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--on-accent);
}

.preset:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.player {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 1rem;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1.3rem;
  border: 0;
  border-radius: 999px;
  background: var(--text);
  color: var(--bg);
  font-weight: 600;
  white-space: nowrap;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toggle:hover:not(:disabled) {
  transform: translateY(-1px);
}

.toggle:disabled {
  opacity: 0.4;
  cursor: progress;
}

.bars {
  display: inline-flex;
  align-items: flex-end;
  gap: 2px;
  height: 14px;
}

.bars i {
  width: 3px;
  height: 4px;
  background: currentColor;
  border-radius: 1px;
}

.toggle[aria-pressed="true"] .bars i {
  animation: bar 0.9s ease-in-out infinite alternate;
}

.toggle[aria-pressed="true"] .bars i:nth-child(2) { animation-delay: -0.3s; }
.toggle[aria-pressed="true"] .bars i:nth-child(3) { animation-delay: -0.6s; }
.toggle[aria-pressed="true"] .bars i:nth-child(4) { animation-delay: -0.15s; }

.viz {
  display: grid;
  grid-template-rows: minmax(0, 2fr) minmax(0, 1fr);
  gap: 4px;
  min-width: 0;
  height: 68px;
}

.viz canvas {
  display: block;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
}

.status {
  min-height: 1.5em;
  margin: 0.7rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

/* ---- Tarjetas ------------------------------------------------------------ */

.card {
  margin: 1.4rem 0;
  padding: 1.4rem 1.6rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
}

.card h2 {
  margin: 0 0 0.6rem;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.card-sub {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.2rem;
}

.card-head h2 {
  margin: 0.1rem 0 0.2rem;
}

.vibe-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.7rem;
}

#vibe {
  margin: 0.1rem 0 0;
  font-size: 1.55rem;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

#explanation {
  max-width: 62ch;
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.palette {
  display: flex;
  gap: 0.4rem;
  padding-top: 0.15rem;
}

.swatch {
  width: 27px;
  height: 27px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px rgb(0 0 0 / 0.08);
}

.source {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  margin: 0.9rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.source-label {
  flex: none;
  color: var(--accent);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 600;
}

.source a {
  word-break: break-all;
}

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 2px;
}

.params {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.65rem 1rem;
  margin: 1.2rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.params dt {
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.params dd {
  margin: 0.05rem 0 0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.84rem;
}

/* ---- Controles manuales -------------------------------------------------- */

.sliders {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1.1rem 1.6rem;
}

.control-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.82rem;
}

.control-head label {
  font-weight: 500;
}

.control-head output {
  color: var(--muted);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  width: 100%;
  height: 24px;
  margin: 0.15rem 0 0;
  padding: 0;
  background: transparent;
  appearance: none;
  -webkit-appearance: none;
  accent-color: var(--accent);
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 3px;
  border-radius: 999px;
  background: var(--surface-strong);
}

input[type="range"]::-webkit-slider-thumb {
  width: 14px;
  height: 14px;
  margin-top: -5.5px;
  border: 2px solid var(--bg);
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 1px var(--line-strong);
  -webkit-appearance: none;
}

input[type="range"]::-moz-range-track {
  height: 3px;
  border-radius: 999px;
  background: var(--surface-strong);
}

input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border: 2px solid var(--bg);
  border-radius: 50%;
  background: var(--accent);
}

input[type="range"]:focus-visible {
  outline: none;
}

input[type="range"]:focus-visible::-webkit-slider-thumb {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 30%, transparent);
}

input[type="range"]:focus-visible::-moz-range-thumb {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 30%, transparent);
}

.control.is-disabled {
  opacity: 0.45;
}

input[type="range"]:disabled {
  cursor: not-allowed;
}

.hint {
  margin: 1.15rem 0 0;
  color: var(--muted);
  font-size: 0.75rem;
}

/* ---- Pie y utilidades ---------------------------------------------------- */

.footer {
  display: flex;
  align-items: center;
  gap: 0.75rem 1.4rem;
  flex-wrap: wrap;
  margin-top: 2.2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.74rem;
}

.footer span:first-child {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.footer a {
  margin-left: auto;
}

pre {
  overflow-x: auto;
  margin: 0;
  padding: 0.9rem 1rem;
  border-radius: 12px;
  background: color-mix(in srgb, var(--bg) 70%, var(--text) 5%);
  font-size: 0.78rem;
}

.spacer {
  height: 160vh;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

:where(button, a, input):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---- Animaciones --------------------------------------------------------- */

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes bar {
  from { height: 3px; }
  to { height: 14px; }
}

@keyframes pulse {
  from { height: 4px; }
  to { height: 17px; }
}

@keyframes dot {
  50% { box-shadow: 0 0 0 6px color-mix(in srgb, var(--accent) 6%, transparent); }
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
}

/* ---- Responsive ---------------------------------------------------------- */

@media (max-width: 640px) {
  .hero,
  main {
    padding-left: 1.1rem;
    padding-right: 1.1rem;
  }

  .hero {
    padding-top: 2.3rem;
  }

  .scan-form {
    grid-template-columns: 1fr;
  }

  .scan-form button {
    width: 100%;
  }

  .player {
    grid-template-columns: 1fr;
  }

  .toggle {
    width: 100%;
    justify-content: center;
  }

  .viz {
    height: 72px;
  }

  .analysis-head {
    gap: 0.7rem;
  }

  .analysis-copy {
    flex-basis: 100%;
    order: 2;
  }

  .analysis-pulse {
    order: 1;
  }

  .analysis-head .ghost {
    order: 3;
  }

  .card {
    padding: 1.2rem 1.15rem;
  }

  .footer {
    align-items: flex-start;
  }

  .footer a {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}