/* ── Variables (sistema Argira) ── */
:root {
  --gold: #e8c96a;
  --gold-dim: #c9a84c;
  --gold-border: rgba(232,201,106,0.25);
  --bg: #0a0a08;
  --surface: #131310;
  --surface2: #1a1a16;
  --text: #f0ead8;
  --text-body: #d8d0bc;
  --text-dim: #a89e88;
  --border: rgba(232,201,106,0.18);
  --green: #4caf50;
  --red: #ef5350;
  --focus: #ffdd44;
  --radius: 4px;
  --accent2: #6ab4e8;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  background: var(--bg);
  color: var(--text-body);
  min-height: 100vh;
}

/* Grain overlay */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none; z-index: 0; opacity: 0.3;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

/* ── Nav ── */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,10,8,0.95); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border); padding: 0 24px;
}
.nav-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 52px;
}
.nav-brand {
  font-family: 'Cinzel', serif; font-size: 0.8rem; letter-spacing: 0.28em;
  color: var(--gold); text-decoration: none;
}
.nav-back {
  font-family: 'Cinzel', serif; font-size: 0.7rem; letter-spacing: 0.18em;
  color: var(--text-dim); text-decoration: none;
}
.nav-back:hover { color: var(--gold); }

/* ── Header ── */
.page-header {
  text-align: center;
  padding: 60px 24px 48px;
  background: radial-gradient(ellipse 70% 50% at 50% 0%, rgba(232,201,106,0.07) 0%, transparent 70%);
  border-bottom: 1px solid var(--border);
}
.header-eyebrow {
  font-family: 'Cinzel', serif; font-size: 0.72rem; letter-spacing: 0.35em;
  color: var(--gold-dim); text-transform: uppercase; margin-bottom: 16px;
}
.page-title {
  font-family: 'Cinzel', serif; font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 600; letter-spacing: 0.12em; color: var(--gold);
  text-shadow: 0 0 60px rgba(232,201,106,0.25);
  margin-bottom: 12px;
}
.page-sub {
  font-family: 'Cormorant Garamond', serif; font-size: 1.15rem;
  font-style: italic; font-weight: 300; color: var(--text-dim);
  max-width: 560px; margin: 0 auto;
}

/* ── Layout principal ── */
.main-wrap {
  max-width: 1100px; margin: 0 auto;
  padding: 40px 16px 80px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}

@media (max-width: 760px) {
  .main-wrap { grid-template-columns: 1fr; }
}

/* ── Cards ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 10px;
}
.card-title {
  font-family: 'Cinzel', serif; font-size: 0.78rem;
  letter-spacing: 0.22em; color: var(--gold);
  text-transform: uppercase;
}
.card-body { padding: 20px; }

/* ── Imagen ── */
.image-preview-wrap {
  position: relative;
  background: #0d0d0a;
  border-bottom: 1px solid var(--border);
  min-height: 280px;
  display: flex; align-items: center; justify-content: center;
}
#imageCanvas {
  display: block;
  max-width: 100%;
  max-height: 360px;
  width: 100%;
  height: auto;
  object-fit: contain;
}
.canvas-placeholder {
  position: absolute;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 10px; color: var(--text-dim);
  font-family: 'Cinzel', serif; font-size: 0.72rem;
  letter-spacing: 0.2em; text-transform: uppercase;
}
.canvas-placeholder .icon { font-size: 2.5rem; opacity: 0.4; }
#imageCanvas.has-image + .canvas-placeholder { display: none; }

/* ── Fuentes de imagen ── */
.source-tabs {
  display: flex; border-bottom: 1px solid var(--border);
}
.source-tab {
  flex: 1;
  padding: 10px 6px;
  font-family: 'Cinzel', serif; font-size: 0.65rem;
  letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--text-dim); background: transparent;
  border: none; cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.source-tab:hover { color: var(--gold); }
.source-tab.active { color: var(--gold); border-bottom-color: var(--gold); background: rgba(232,201,106,0.04); }

.source-panel { display: none; padding: 16px 20px; }
.source-panel.active { display: block; }

/* Ejemplos generados */
.examples-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px;
}
.example-btn {
  padding: 10px 6px;
  font-family: 'Cinzel', serif; font-size: 0.62rem;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text-dim); background: var(--surface2);
  border: 1px solid var(--border); border-radius: var(--radius);
  cursor: pointer; transition: all 0.2s; text-align: center;
}
.example-btn:hover { border-color: var(--gold-dim); color: var(--gold); }
.example-btn .ex-icon { font-size: 1.4rem; display: block; margin-bottom: 4px; }

/* Upload */
.upload-zone {
  border: 2px dashed rgba(232,201,106,0.25);
  border-radius: var(--radius);
  padding: 28px 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--gold-dim);
  background: rgba(232,201,106,0.04);
}
.upload-zone p {
  font-family: 'Cinzel', serif; font-size: 0.72rem;
  letter-spacing: 0.18em; color: var(--text-dim);
  text-transform: uppercase;
}
.upload-icon { font-size: 2rem; margin-bottom: 8px; opacity: 0.5; }

/* URL */
.url-form { display: flex; gap: 8px; flex-wrap: wrap; }
.url-input {
  flex: 1; min-width: 0;
  background: var(--surface2); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text);
  padding: 10px 14px; font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem; outline: none;
}
.url-input:focus { border-color: var(--gold-dim); }
.url-input::placeholder { color: var(--text-dim); }
.url-btn {
  padding: 10px 18px;
  font-family: 'Cinzel', serif; font-size: 0.68rem;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--gold); background: rgba(232,201,106,0.08);
  border: 1px solid var(--gold-dim); border-radius: var(--radius);
  cursor: pointer; transition: all 0.2s; white-space: nowrap;
}
.url-btn:hover { background: var(--gold); color: #000; }

/* ── Sonido ── */
.sound-row {
  display: flex; gap: 8px; padding: 16px 20px;
  border-top: 1px solid var(--border); flex-wrap: wrap;
}
.sound-btn {
  flex: 1;
  padding: 10px 14px;
  font-family: 'Cinzel', serif; font-size: 0.68rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  border-radius: var(--radius); cursor: pointer;
  transition: all 0.2s; border: 1.5px solid;
}
.sound-btn-play {
  color: var(--gold); border-color: var(--gold-dim);
  background: rgba(232,201,106,0.08);
}
.sound-btn-play:hover, .sound-btn-play.playing {
  background: var(--gold); color: #000;
}
.sound-btn-stop {
  color: var(--text-dim); border-color: var(--border);
  background: transparent;
}
.sound-btn-stop:hover { border-color: var(--text-dim); color: var(--text); }

/* Indicador frecuencia */
.freq-display {
  padding: 10px 20px;
  background: #0d0d0a;
  border-top: 1px solid var(--border);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem; color: var(--text-dim);
  display: flex; align-items: center; gap: 10px;
}
.freq-value { color: var(--gold); font-size: 1rem; font-weight: 500; }
.freq-bar {
  flex: 1; height: 3px;
  background: rgba(232,201,106,0.12);
  border-radius: 2px; overflow: hidden;
}
.freq-bar-fill {
  height: 100%;
  background: linear-gradient(to right, #c9a84c, #e8c96a);
  border-radius: 2px;
  transition: width 0.5s ease;
  width: 0%;
}

/* ── Métricas numéricas ── */
.metrics-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1px; background: var(--border);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.metric-cell {
  background: var(--surface);
  padding: 16px 18px;
  position: relative;
}
.metric-cell-wide {
  grid-column: 1 / -1;
}
.metric-label-sm {
  font-family: 'Cinzel', serif; font-size: 0.62rem;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--text-dim); margin-bottom: 6px;
  display: flex; align-items: center; gap: 6px;
}
.metric-val {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.6rem; font-weight: 500;
  color: var(--gold); line-height: 1;
}
.metric-bar {
  height: 2px; margin-top: 8px;
  background: rgba(232,201,106,0.1); border-radius: 1px;
  overflow: hidden;
}
.metric-bar-fill {
  height: 100%;
  background: linear-gradient(to right, var(--gold-dim), var(--gold));
  border-radius: 1px;
  transition: width 0.6s cubic-bezier(0.4,0,0.2,1);
  width: 0%;
}

/* ── Radar chart ── */
.radar-wrap {
  padding: 20px;
  display: flex; flex-direction: column; align-items: center;
}
#radarCanvas {
  width: 100%; max-width: 320px; height: auto;
}

/* ── Interpretación ── */
.interpretation {
  padding: 20px;
  border-top: 1px solid var(--border);
}
.interp-title {
  font-family: 'Cinzel', serif; font-size: 0.68rem;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--gold-dim); margin-bottom: 12px;
}
.interp-text {
  font-family: 'Cormorant Garamond', serif; font-size: 1.05rem;
  font-style: italic; color: var(--text-body); line-height: 1.8;
}
.interp-style {
  margin-top: 10px;
  display: inline-block;
  font-family: 'Cinzel', serif; font-size: 0.65rem;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--gold);
  padding: 4px 12px;
  border: 1px solid var(--gold-border);
  border-radius: 40px;
}

/* ── Fórmulas ── */
.formulas {
  padding: 16px 20px;
  background: #0d0d0a;
  border-top: 1px solid var(--border);
}
.formula-label {
  font-family: 'Cinzel', serif; font-size: 0.62rem;
  letter-spacing: 0.25em; text-transform: uppercase;
  color: var(--gold-dim); margin-bottom: 10px;
}
.formula-line {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem; color: #a0a090;
  line-height: 1.8;
}
.formula-line em { color: var(--gold-dim); font-style: normal; }

/* ── Token sonoro ── */
.sonic-token {
  margin: 16px 20px;
  padding: 14px 16px;
  background: rgba(232,201,106,0.05);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius);
}
.token-label {
  font-family: 'Cinzel', serif; font-size: 0.62rem;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--gold-dim); margin-bottom: 6px;
}
.token-value {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem; color: var(--text);
}

/* ── Estado inicial (sin imagen) ── */
.empty-state {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 48px 24px; text-align: center; gap: 12px;
}
.empty-icon { font-size: 3rem; opacity: 0.2; }
.empty-text {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.05rem; font-style: italic;
  color: var(--text-dim);
}

/* Tooltip info */
.info-dot {
  display: inline-flex; align-items: center; justify-content: center;
  width: 14px; height: 14px;
  border-radius: 50%; background: rgba(232,201,106,0.15);
  color: var(--gold-dim); font-size: 9px; cursor: help;
  font-family: 'IBM Plex Mono', monospace; font-style: normal;
  flex-shrink: 0;
}

/* Loading */
.loading-bar {
  height: 2px; background: var(--border);
  overflow: hidden; display: none;
}
.loading-bar.active { display: block; }
.loading-bar::after {
  content: '';
  display: block; height: 100%;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  animation: loading 1.2s ease-in-out infinite;
  width: 40%;
}
@keyframes loading {
  0% { transform: translateX(-150%); }
  100% { transform: translateX(350%); }
}

/* Screen reader only */
.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;
}

/* Speak button */
.speak-btn {
  display: flex; align-items: center; justify-content: center;
  gap: 10px; width: calc(100% - 40px); margin: 0 20px 20px;
  padding: 11px 16px;
  font-size: 0.82rem; font-weight: 600;
  font-family: 'Cinzel', serif; letter-spacing: 0.14em; text-transform: uppercase;
  background: rgba(232,201,106,0.08); border: 1.5px solid var(--gold-dim);
  border-radius: 48px; color: var(--gold);
  transition: all 0.2s; cursor: pointer;
}
.speak-btn:hover, .speak-btn:focus-visible { background: var(--gold); color: #000; }
.speak-btn.speaking { background: var(--gold); color: #000; border-color: #fff; }

/* Tabla ARIA (invisible visualmente) */
.radar-table {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* Footer */
.page-footer {
  text-align: center; padding: 32px 24px;
  border-top: 1px solid var(--border);
  font-family: 'Cinzel', serif; font-size: 0.68rem;
  letter-spacing: 0.22em; color: var(--text-dim);
  text-transform: uppercase;
}
.page-footer a { color: var(--gold-dim); text-decoration: none; }

/* ── Controles de atenuación de agudos (shelving) ── */
.shelving-panel {
  padding: 14px 20px;
  background: rgba(106, 180, 232, 0.04);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.shelving-panel .param-row {
  margin-bottom: 12px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.shelving-panel .param-row:last-of-type {
  margin-bottom: 0;
}
.shelving-panel label {
  font-family: 'Cinzel', serif;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 6px;
}
.shelving-panel input[type="range"] {
  width: 100%;
  margin: 0;
  accent-color: var(--accent2);
  cursor: pointer;
}
.shelving-indicator {
  height: 2px;
  background: rgba(106, 180, 232, 0.12);
  margin: 10px 0 6px;
  border-radius: 1px;
  overflow: hidden;
}
.shelving-indicator-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(to right, #4a90c4, var(--accent2));
  transition: width 0.25s ease;
  border-radius: 1px;
}
.shelving-note {
  font-size: 0.62rem;
  color: var(--text-dim);
  text-align: center;
  font-family: 'Cinzel', serif;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 8px;
  opacity: 0.7;
}