/* =====================================================
   MusicTools — 3-Theme Design System
   Themes: neon (default) · minimal · amber
   Apply theme: <html data-theme="neon|minimal|amber">
   ===================================================== */

/* Fuentes: las carga shared/boot.js según el tema activo (sin bloquear el dibujo) */

/* =====================================================
   THEME TOKENS — default = Neón Midnight
   ===================================================== */
:root {
  /* Backgrounds */
  --bg:          #07071a;
  --bg-gradient: radial-gradient(120% 80% at 0% 0%, #1b1442 0%, transparent 55%),
                 radial-gradient(110% 80% at 100% 100%, #0a2d4a 0%, transparent 60%),
                 #07071a;
  /* Surfaces */
  --surface:     rgba(255,255,255,0.04);
  --surface-s:   rgba(255,255,255,0.08);
  --surface-ss:  rgba(255,255,255,0.13);
  /* Borders */
  --border:      rgba(255,255,255,0.09);
  --border-s:    rgba(255,255,255,0.16);
  /* Text */
  --ink:         #eef0ff;
  --ink-dim:     rgba(238,240,255,0.6);
  --muted:       rgba(238,240,255,0.42);
  /* Accent — Neón Midnight: violet + cyan */
  --accent:      #9d6bff;
  --accent-rgb:  157, 107, 255;
  --accent2:     #00c8ff;
  --accent2-rgb: 0, 200, 255;
  --accent-ink:  #0a0620;
  /* Semantic */
  --success:     #39f29d;
  --danger:      #ff5b7f;
  --success-rgb: 57,242,157;
  --danger-rgb:  255,91,127;
  --warning:     #ffb74a;
  /* Effects */
  --glow:        1;
  --radius:      20px;
  --radius-sm:   12px;
  --radius-xs:   8px;
  --radius-pill: 999px;
  --accent-glow:   0 0 40px rgba(var(--accent-rgb),0.45), 0 0 80px rgba(var(--accent-rgb),0.22);
  --accent-shadow: 0 12px 30px -8px rgba(var(--accent-rgb),0.7), inset 0 1px 0 rgba(255,255,255,0.25);
  --card-shadow:   0 8px 30px rgba(0,0,0,0.35), inset 0 1px 0 rgba(255,255,255,0.05);
  /* Typography */
  --font-head:   'Space Grotesk', 'Inter', sans-serif;
  --font-sans:   'Inter', system-ui, sans-serif;
  /* Shell chrome */
  --topbar-bg:   rgba(7,7,26,0.6);
  --nav-bg:      rgba(7,7,26,0.88);
  --sidebar-w:   260px;
  --topbar-h:    64px;
  --bottomnav-h: 72px;
  /* Ambient blobs */
  --ambient1:    rgba(var(--accent-rgb),0.12);
  --ambient2:    rgba(0,200,255,0.08);
  /* Theme kind for JS consumers */
  --theme-kind:  dark;
}

/* =====================================================
   STUDIO MINIMAL — warm sand, coral accent, Fraunces
   ===================================================== */
[data-theme="minimal"] {
  --bg:          #f5f2ec;
  --bg-gradient: radial-gradient(80% 60% at 100% 0%, rgba(232,90,60,0.05) 0%, transparent 55%), #f5f2ec;
  --surface:     rgba(255,255,255,0.7);
  --surface-s:   #ffffff;
  --surface-ss:  #f0ede7;
  --border:      rgba(26,26,26,0.08);
  --border-s:    rgba(26,26,26,0.18);
  --ink:         #1a1a1a;
  --ink-dim:     rgba(26,26,26,0.65);
  --muted:       rgba(26,26,26,0.48);
  --accent:      #e85a3c;
  --accent-rgb:  232, 90, 60;
  --accent2:     #1a1a1a;
  --accent2-rgb: 26, 26, 26;
  --accent-ink:  #ffffff;
  --success:     #2f8f5f;
  --danger:      #c73c3c;
  --success-rgb: 47,143,95;
  --danger-rgb:  199,60,60;
  --warning:     #c9821a;
  --glow:        0;
  --radius:      18px;
  --accent-glow:   none;
  --accent-shadow: 0 6px 16px -4px rgba(232,90,60,0.35);
  --card-shadow:   0 2px 12px rgba(26,26,26,0.06), inset 0 1px 0 rgba(255,255,255,0.8);
  --font-head:   'Fraunces', 'Inter', serif;
  --topbar-bg:   rgba(245,242,236,0.85);
  --nav-bg:      rgba(255,255,255,0.92);
  --ambient1:    rgba(232,90,60,0.04);
  --ambient2:    rgba(26,26,26,0.02);
  --theme-kind:  light;
}

/* =====================================================
   AMBER STAGE — espresso, brass/amber, Instrument Serif
   ===================================================== */
[data-theme="amber"] {
  --bg:          #14100e;
  --bg-gradient: radial-gradient(120% 80% at 100% 0%, #2a1a14 0%, transparent 55%), #14100e;
  --surface:     rgba(244,233,220,0.05);
  --surface-s:   rgba(244,233,220,0.12);
  --surface-ss:  rgba(244,233,220,0.20);
  --border:      rgba(244,233,220,0.09);
  --border-s:    rgba(244,233,220,0.18);
  --ink:         #f4e9dc;
  --ink-dim:     rgba(244,233,220,0.65);
  --muted:       rgba(244,233,220,0.45);
  --accent:      #f0a854;
  --accent-rgb:  240, 168, 84;
  --accent2:     #d95e22;
  --accent2-rgb: 217, 94, 34;
  --accent-ink:  #1a0f08;
  --success:     #82c98c;
  --danger:      #e8725a;
  --success-rgb: 130,201,140;
  --danger-rgb:  232,114,90;
  --warning:     #f0a854;
  --glow:        0.7;
  --radius:      16px;
  --accent-glow:   0 0 30px rgba(240,168,84,0.35), 0 0 60px rgba(240,168,84,0.16);
  --accent-shadow: 0 10px 24px -6px rgba(240,168,84,0.6), inset 0 1px 0 rgba(255,255,255,0.2);
  --card-shadow:   0 8px 30px rgba(0,0,0,0.5), inset 0 1px 0 rgba(244,233,220,0.05);
  --font-head:   'Instrument Serif', 'Fraunces', serif;
  --topbar-bg:   rgba(20,16,14,0.7);
  --nav-bg:      rgba(20,16,14,0.88);
  --ambient1:    rgba(240,168,84,0.1);
  --ambient2:    rgba(217,94,34,0.08);
  --theme-kind:  dark;
}

/* =====================================================
   RESET + BASE
   ===================================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Móvil: sin retardo de doble-tap/zoom ni flash gris al tocar controles */
button, select, input, label, a, [onclick], [role="button"] {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

body {
  background: var(--bg-gradient);
  color: var(--ink);
  transition: background 0.35s ease, color 0.35s ease;
  min-height: 100vh;
}

/* =====================================================
   AMBIENT BACKGROUND GLOW
   ===================================================== */
.mt-ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  transition: opacity 0.35s ease;
}
.mt-ambient::before {
  content: '';
  position: absolute;
  top: -20%; right: -10%;
  width: 500px; height: 500px;
  border-radius: 50%;
  background: var(--ambient1);
  filter: blur(100px);
}
.mt-ambient::after {
  content: '';
  position: absolute;
  bottom: -10%; left: -15%;
  width: 600px; height: 500px;
  border-radius: 50%;
  background: var(--ambient2);
  filter: blur(110px);
}

/* =====================================================
   SHELL LAYOUT
   ===================================================== */
.mt-shell {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  z-index: 1;
}
@media (min-width: 960px) {
  .mt-shell { flex-direction: row; height: 100vh; overflow: hidden; }
}

/* =====================================================
   SIDEBAR (Desktop only)
   ===================================================== */
.mt-sidebar { display: none; }
@media (min-width: 960px) {
  .mt-sidebar {
    display: flex;
    flex-direction: column;
    width: var(--sidebar-w);
    flex-shrink: 0;
    height: 100vh;
    padding: 22px 18px;
    gap: 4px;
    border-right: 1px solid var(--border);
    background: var(--topbar-bg);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    overflow-y: auto;
    transition: background 0.35s ease, border-color 0.35s ease;
  }
}

.mt-sidebar-brand {
  padding: 4px 8px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.mt-sidebar-brand svg { color: var(--accent); }
.mt-brand-text {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.mt-sidebar-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 14px 10px 6px;
}

.mt-sidebar-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid transparent;
  color: var(--ink);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-sans);
  text-decoration: none;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  width: 100%;
}
.mt-sidebar-btn:hover { background: var(--surface-s); }
.mt-sidebar-btn.active {
  background: rgba(var(--accent-rgb), 0.14);
  border-color: rgba(var(--accent-rgb), 0.3);
  color: var(--accent);
}

.mt-sidebar-tool {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 10px;
  background: transparent;
  border: none;
  color: var(--ink-dim);
  font-weight: 500;
  font-size: 13px;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-sans);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
  width: 100%;
}
.mt-sidebar-tool:hover { background: var(--surface); color: var(--ink); }
.mt-sidebar-tool.active { background: rgba(var(--accent-rgb), 0.1); color: var(--accent); }

.mt-sidebar-streak {
  margin-top: auto;
  padding: 14px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.16) 0%, rgba(var(--accent2-rgb), 0.08) 100%);
  border: 1px solid rgba(var(--accent-rgb), 0.25);
}
.mt-sidebar-streak .streak-icon  { color: var(--accent); margin-bottom: 8px; }
.mt-sidebar-streak .streak-title { font-size: 13px; font-weight: 700; color: var(--ink); }
.mt-sidebar-streak .streak-sub   { font-size: 11px; color: var(--ink-dim); margin-top: 2px; }

/* =====================================================
   MAIN CONTENT AREA
   ===================================================== */
.mt-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}
@media (min-width: 960px) {
  .mt-main { overflow: hidden; height: 100vh; }
}

/* =====================================================
   TOPBAR
   ===================================================== */
.mt-topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 20px;
  height: var(--topbar-h);
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
  background: var(--topbar-bg);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 10;
  transition: background 0.35s ease, border-color 0.35s ease;
}
@media (min-width: 960px) { .mt-topbar { padding: 0 32px; } }

.mt-topbar-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--ink);
}
@media (min-width: 960px) { .mt-topbar-brand { display: none; } }

.mt-topbar-spacer { flex: 1; }

.mt-topbar-search {
  display: none;
}
@media (min-width: 960px) {
  .mt-topbar-search {
    flex: 1; max-width: 360px;
    margin-right: auto; margin-left: 8px;
    display: flex; align-items: center; gap: 10px;
    padding: 10px 16px; border-radius: var(--radius-pill);
    background: var(--surface); border: 1px solid var(--border);
    color: var(--muted); font-size: 13px; font-family: var(--font-sans);
  }
}
.mt-topbar-search input {
  flex: 1; min-width: 0;
  background: none; border: none; outline: none;
  color: var(--ink); font: inherit;
}
.mt-topbar-search input::placeholder { color: var(--muted); }
.mt-topbar-search:focus-within { border-color: rgba(var(--accent-rgb), 0.45); }
.mt-topbar-search kbd {
  margin-left: auto; padding: 2px 8px;
  border-radius: 6px; background: var(--surface-s);
  font-size: 10px; font-weight: 700; color: var(--ink-dim);
  font-family: var(--font-sans);
}

/* Back button */
.mt-topbar-back {
  display: flex; align-items: center; gap: 12px; flex: 1; min-width: 0;
}
.mt-back-info { min-width: 0; }   /* permite que el título se corte con "…" */
.mt-back-info .back-label {
  font-size: 10px; font-weight: 700; letter-spacing: 0.14em;
  color: var(--muted); text-transform: uppercase;
}
.mt-back-info .back-title {
  font-size: 18px; font-weight: 800; letter-spacing: -0.015em;
  color: var(--ink); font-family: var(--font-head);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-top: 1px;
}

/* =====================================================
   THEME SWITCHER BUTTON
   ===================================================== */
.mt-theme-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 8px 12px;
  height: 36px;
  border-radius: var(--radius-pill);
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.mt-theme-btn:hover { background: var(--surface-s); border-color: var(--border-s); }
.mt-theme-btn:active { transform: scale(0.95); }
.mt-theme-btn .theme-label {
  font-size: 11px; font-weight: 700;
  color: var(--ink-dim); letter-spacing: 0.02em;
  font-family: var(--font-sans);
}
/* Pantallas estrechas (≤359 px): el tema se muestra solo con sus puntos de color */
@media (max-width: 359px) {
  .mt-topbar { padding: 0 12px; gap: 8px; }
  .mt-theme-btn { padding: 8px 10px; }
  .mt-theme-btn .theme-label { display: none; }
}
/* Enarmónico secundario en botones de fundamental (Do♯ / Re♭) */
.enh-alt {
  display: block;
  margin-top: 1px;
  font-size: 10px;
  font-weight: 600;
  opacity: 0.65;
  line-height: 1.1;
}

.mt-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

/* =====================================================
   ICON BUTTON (circular)
   ===================================================== */
.mt-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--ink);
  cursor: pointer;
  flex-shrink: 0;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.mt-icon-btn:hover { background: var(--surface-s); border-color: var(--border-s); }

/* =====================================================
   CONTENT SCROLL AREA
   ===================================================== */
.mt-content {
  flex: 1;
  overflow-y: auto;
  padding-bottom: calc(var(--bottomnav-h) + 16px);
  scroll-behavior: smooth;
}
@media (min-width: 960px) {
  .mt-content { padding-bottom: 40px; overflow-y: auto; height: calc(100vh - var(--topbar-h)); }
}
.mt-content-inner {
  max-width: 980px; margin: 0 auto; padding: 0 20px;
}
@media (min-width: 960px) { .mt-content-inner { padding: 0 32px; } }

/* =====================================================
   BOTTOM NAV (Mobile only)
   ===================================================== */
.mt-bottomnav {
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 8px 12px max(12px, env(safe-area-inset-bottom));
  gap: 4px;
  background: var(--nav-bg);
  -webkit-backdrop-filter: blur(26px);
  backdrop-filter: blur(26px);
  border-top: 1px solid var(--border);
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 20;
  transition: background 0.35s ease, border-color 0.35s ease;
}
@media (min-width: 960px) { .mt-bottomnav { display: none; } }

.mt-nav-item {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  background: transparent; border: none;
  color: var(--muted);
  cursor: pointer; font-family: var(--font-sans); text-decoration: none;
  transition: color 0.15s;
  flex: 1; min-height: 44px; justify-content: center;
  min-width: 0;            /* 320 px: "Herramientas" no debe empujar fuera de pantalla */
  position: relative;
}
@media (max-width: 359px) {
  .mt-nav-item { padding: 8px 6px; }
}
.mt-nav-item.active { color: var(--accent); }
.mt-nav-item.active::before {
  content: '';
  position: absolute;
  top: 2px;
  width: 28px; height: 3px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(var(--accent-rgb), 0.7);
}
.mt-nav-item .nav-label { font-size: 10px; font-weight: 700; }

/* =====================================================
   GLASS CARD PRIMITIVES
   ===================================================== */
.glass {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  backdrop-filter: blur(18px) saturate(180%);
  box-shadow: var(--card-shadow);
}
.glass-strong {
  background: var(--surface-s);
  border: 1px solid var(--border-s);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  backdrop-filter: blur(18px) saturate(180%);
  box-shadow: var(--card-shadow);
}
.glass-accent {
  background: rgba(var(--accent-rgb), 0.08);
  border: 1px solid rgba(var(--accent-rgb), 0.3);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}

/* =====================================================
   BUTTONS
   ===================================================== */
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 18px; border: none; border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
  color: var(--accent-ink);
  font-weight: 700; font-size: 13px; font-family: var(--font-sans);
  cursor: pointer; min-height: 44px; letter-spacing: -0.005em;
  box-shadow: var(--accent-shadow);
  transition: transform 0.1s, box-shadow 0.2s;
  text-decoration: none;
}
.btn-primary:active { transform: scale(0.97); }
.btn-primary:hover  { box-shadow: var(--accent-glow), var(--accent-shadow); }

.btn-ghost {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 18px;
  border: 1px solid var(--border); border-radius: var(--radius-pill);
  background: var(--surface); color: var(--ink);
  font-weight: 700; font-size: 13px; font-family: var(--font-sans);
  cursor: pointer; min-height: 44px;
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  transition: background 0.15s, border-color 0.15s;
  text-decoration: none;
}
.btn-ghost:hover  { background: var(--surface-s); border-color: var(--border-s); }
.btn-ghost.active {
  background: rgba(var(--accent-rgb), 0.14);
  border-color: rgba(var(--accent-rgb), 0.35);
  color: var(--accent);
}

/* =====================================================
   SECTION LABEL
   ===================================================== */
.section-label {
  font-size: 11px; font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.14em; text-transform: uppercase;
  margin: 28px 0 12px;
}

/* =====================================================
   HOME TOOL CARDS
   ===================================================== */
.tool-card-nm {
  display: flex; flex-direction: column; justify-content: space-between; gap: 8px;
  padding: 18px 16px;
  border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
  -webkit-backdrop-filter: blur(18px); backdrop-filter: blur(18px);
  cursor: pointer; text-decoration: none; color: var(--ink);
  min-height: 130px; position: relative; overflow: hidden;
  transition: transform 0.18s, box-shadow 0.18s, background 0.18s, border-color 0.18s;
  box-shadow: var(--card-shadow);
}
.tool-card-nm::before {
  content: '';
  position: absolute; right: -20px; bottom: -20px;
  width: 80px; height: 80px; border-radius: 50%;
  background: rgba(var(--accent-rgb), 0.08);
  filter: blur(24px); transition: background 0.3s;
}
.tool-card-nm:hover {
  background: var(--surface-s);
  border-color: rgba(var(--accent-rgb), 0.3);
  transform: translateY(-2px);
  box-shadow: 0 14px 40px -15px rgba(var(--accent-rgb), 0.35);
}
.tool-card-nm:hover::before { background: rgba(var(--accent-rgb), 0.2); }
.tool-card-nm:active { transform: scale(0.97); }

.tc-icon-wrap {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  background: rgba(var(--accent-rgb), 0.14);
  border: 1px solid rgba(var(--accent-rgb), 0.25);
  color: var(--accent); flex-shrink: 0;
}
.tc-name    { font-size: 14px; font-weight: 700; color: var(--ink); letter-spacing: -0.01em; font-family: var(--font-head); }
.tc-desc    { font-size: 11.5px; color: var(--muted); margin-top: 2px; line-height: 1.35; }
.tc-arrow   { align-self: flex-end; color: var(--muted); opacity: 0.5; transition: opacity 0.2s; }
.tool-card-nm:hover .tc-arrow { opacity: 1; }

/* Featured (full-width) card */
.tool-card-nm.featured {
  flex-direction: row; align-items: center;
  grid-column: 1 / -1; min-height: 100px;
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.18) 0%, rgba(var(--accent2-rgb), 0.10) 100%);
  border-color: rgba(var(--accent-rgb), 0.32);
  box-shadow: 0 20px 50px -18px rgba(var(--accent-rgb), 0.4), inset 0 1px 0 rgba(255,255,255,0.1);
  gap: 16px; padding: 20px;
}
.tool-card-nm.featured:hover {
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.26) 0%, rgba(var(--accent2-rgb), 0.14) 100%);
  transform: translateY(-2px);
}
.tool-card-nm.featured .tc-icon-wrap {
  width: 52px; height: 52px;
  background: rgba(255,255,255,0.14); border-color: rgba(255,255,255,0.2); border-radius: 16px;
}
.tool-card-nm.featured .tc-name { font-size: 17px; }
.tool-card-nm.featured .tc-desc { font-size: 12.5px; }

/* Grid */
.tools-grid-nm { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
@media (min-width: 960px) { .tools-grid-nm { grid-template-columns: repeat(4, 1fr); } }

/* =====================================================
   APP CARD WRAPPER
   ===================================================== */
.app-card {
  background: transparent !important;
  max-width: 100% !important;
  height: auto !important; min-height: unset !important;
  border-radius: 0 !important; box-shadow: none !important;
  display: flex !important; flex-direction: column !important;
}
@media (min-width: 960px) { .app-card { max-width: 720px; margin: 0 auto; } }

body { display: block; }

/* =====================================================
   DISPLAY SECTION (app header panel)
   ===================================================== */
.display-section {
  color: var(--ink) !important;
  text-align: center;
  padding: 20px 20px 24px !important;
  border-radius: var(--radius) !important;
  margin-bottom: 16px;
  position: relative; overflow: hidden;
  -webkit-backdrop-filter: blur(18px); backdrop-filter: blur(18px);
  transition: background 0.35s ease, border-color 0.35s ease;
}

/* Default neutral display section */
.display-section:not(.in-tune):not(.close):not(.out-tune):not(.ds-correct):not(.ds-wrong):not(.ds-gameover):not(.listening) {
  background: linear-gradient(135deg,
    rgba(var(--accent-rgb), 0.18) 0%,
    rgba(var(--accent2-rgb), 0.10) 100%) !important;
  border: 1px solid rgba(var(--accent-rgb), 0.28) !important;
  box-shadow: 0 20px 50px -18px rgba(var(--accent-rgb), 0.3) !important;
}

/* Tuner states */
.display-section.in-tune  {
  background: linear-gradient(135deg, rgba(var(--success-rgb),0.22), rgba(0,200,100,0.12)) !important;
  border: 1px solid rgba(var(--success-rgb),0.35) !important;
}
.display-section.close    {
  background: linear-gradient(135deg, rgba(255,183,74,0.22), rgba(255,140,0,0.12)) !important;
  border: 1px solid rgba(255,183,74,0.35) !important;
}
.display-section.out-tune {
  background: linear-gradient(135deg, rgba(var(--danger-rgb),0.22), rgba(255,60,100,0.12)) !important;
  border: 1px solid rgba(var(--danger-rgb),0.35) !important;
}
.display-section.listening {
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.12) 0%, rgba(var(--accent2-rgb), 0.06) 100%) !important;
  border: 1px solid rgba(var(--accent-rgb), 0.18) !important;
}

/* Ear training states */
.display-section.ds-correct {
  background: linear-gradient(135deg, rgba(var(--success-rgb),0.22), rgba(0,200,100,0.12)) !important;
  border: 1px solid rgba(var(--success-rgb),0.35) !important;
}
.display-section.ds-wrong   {
  background: linear-gradient(135deg, rgba(var(--danger-rgb),0.22), rgba(255,60,100,0.12)) !important;
  border: 1px solid rgba(var(--danger-rgb),0.35) !important;
}
.display-section.ds-gameover {
  background: var(--surface-s) !important;
  border: 1px solid var(--border) !important;
}

/* =====================================================
   CONFIG BODY + SECTION CARDS
   ===================================================== */
.config-body {
  background: transparent !important;
  padding: 0 !important;
  display: flex; flex-direction: column; gap: 12px;
}
.section-card {
  background: var(--surface-s) !important;
  border: 1px solid var(--border) !important;
  border-radius: var(--radius-sm) !important;
  padding: 14px !important;
  box-shadow: var(--card-shadow);
}
.section-title {
  font-size: 10px !important; font-weight: 700 !important;
  color: var(--muted) !important; letter-spacing: 0.14em !important;
  text-transform: uppercase !important; margin-bottom: 10px !important;
}
label {
  font-size: 12px !important; font-weight: 600 !important;
  color: var(--ink-dim) !important; margin-bottom: 4px !important;
  display: block;
}
select, input[type="text"], input[type="number"] {
  background: var(--surface) !important;
  border: 1px solid var(--border-s) !important;
  color: var(--ink) !important;
  border-radius: var(--radius-xs) !important;
  padding: 8px 10px !important;
  font-family: var(--font-sans) !important;
  width: 100%;
}
select option { background: var(--bg); color: var(--ink); }
input[type="range"] { accent-color: var(--accent); }

/* Light-theme specific overrides */
[data-theme="minimal"] select,
[data-theme="minimal"] input[type="text"],
[data-theme="minimal"] input[type="number"] {
  background: #ffffff !important;
  border: 1px solid rgba(26,26,26,0.15) !important;
  color: #1a1a1a !important;
}
[data-theme="minimal"] select option { background: #f5f2ec; color: #1a1a1a; }

/* Grid layout */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

/* Toggle row */
.toggle-row {
  background: var(--surface) !important; border: 1px solid var(--border) !important;
  border-radius: var(--radius-xs) !important; padding: 3px !important;
}
.toggle-btn {
  color: var(--ink-dim) !important; background: transparent !important;
  border-radius: 6px !important; font-size: 12px !important; border: none !important;
  padding: 5px 8px !important; cursor: pointer !important;
  font-family: var(--font-sans) !important; transition: background 0.15s, color 0.15s !important;
}
.toggle-btn.active {
  background: rgba(var(--accent-rgb), 0.2) !important;
  color: var(--accent) !important;
}

/* =====================================================
   MINI BUTTONS (preset grids)
   ===================================================== */
.btn-mini {
  background: var(--surface-s) !important; color: var(--ink-dim) !important;
  border: 1px solid var(--border) !important; border-radius: var(--radius-xs) !important;
  padding: 7px 6px !important; font-size: 11px !important;
  font-family: var(--font-sans) !important; cursor: pointer !important;
  transition: background 0.15s, color 0.15s !important;
}
.btn-mini:hover {
  background: rgba(var(--accent-rgb), 0.18) !important;
  color: var(--accent) !important;
  border-color: rgba(var(--accent-rgb), 0.3) !important;
}

/* =====================================================
   ACTION BAR
   ===================================================== */
.action-bar {
  padding: 12px 0 8px !important;
  display: flex !important; gap: 10px !important; background: transparent !important;
}
.action-bar .btn {
  flex: 1 !important; padding: 14px !important; border-radius: var(--radius-pill) !important;
  font-weight: 700 !important; font-size: 13px !important; font-family: var(--font-sans) !important;
  border: none !important; cursor: pointer !important; min-height: 48px !important;
  letter-spacing: 0.02em !important; transition: transform 0.1s, box-shadow 0.2s !important;
}
.action-bar .btn:active { transform: scale(0.97) !important; }
.action-bar .btn-play,
.action-bar .btn.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2)) !important;
  color: var(--accent-ink) !important; box-shadow: var(--accent-shadow) !important;
}
.action-bar .btn-stop,
.action-bar .btn.btn-danger {
  background: var(--danger) !important; color: #fff !important;
}

/* =====================================================
   INSTRUMENT PILLS (tuner)
   ===================================================== */
.instrument-pill {
  background: var(--surface-s) !important; border: 1px solid var(--border) !important;
  color: var(--ink-dim) !important; font-family: var(--font-sans) !important;
  border-radius: var(--radius-pill) !important; padding: 7px 14px !important;
  font-weight: 600 !important; font-size: 12px !important; cursor: pointer !important;
  transition: all 0.15s !important; flex-shrink: 0 !important; white-space: nowrap !important;
}
.instrument-pill.active {
  background: rgba(var(--accent-rgb), 0.2) !important;
  border-color: rgba(var(--accent-rgb), 0.4) !important; color: var(--accent) !important;
}
.instrument-pill:hover {
  background: var(--surface-ss) !important; border-color: var(--border-s) !important; color: var(--ink) !important;
}

/* Tuning select */
.tuning-select {
  background: var(--surface-s) !important; border: 1px solid var(--border-s) !important;
  color: var(--ink) !important; border-radius: var(--radius-xs) !important;
  font-family: var(--font-sans) !important; appearance: none !important;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239d6bff' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E") !important;
  background-repeat: no-repeat !important; background-position: right 12px center !important;
  padding-right: 32px !important;
}
[data-theme="minimal"] .tuning-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23e85a3c' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E") !important;
}
[data-theme="amber"] .tuning-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23f0a854' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E") !important;
}

/* =====================================================
   STRING BUTTONS (tuner)
   ===================================================== */
.string-btn {
  background: var(--surface-s) !important; border: 1px solid var(--border) !important;
  border-radius: var(--radius-xs) !important; cursor: pointer !important; transition: all 0.15s !important;
}
.string-btn .string-note  { color: var(--ink) !important; font-size: 20px !important; font-weight: 800 !important; display: block !important; line-height: 1 !important; }
.string-btn .string-label { color: var(--muted) !important; font-size: 10px !important; display: block !important; margin-top: 3px !important; font-weight: 500 !important; }
.string-btn:hover { border-color: rgba(var(--accent-rgb), 0.4) !important; background: rgba(var(--accent-rgb), 0.1) !important; }
.string-btn.selected { background: rgba(var(--accent-rgb), 0.22) !important; border-color: var(--accent) !important; }
.string-btn.selected .string-note,
.string-btn.selected .string-label { color: var(--accent) !important; }
.string-btn.auto-highlight { border-color: rgba(var(--success-rgb), 0.5) !important; background: rgba(var(--success-rgb),0.08) !important; }

/* Note ref grid */
.note-ref-btn {
  background: var(--surface-s) !important; border: 1px solid var(--border) !important;
  color: var(--ink-dim) !important; border-radius: var(--radius-xs) !important;
  font-family: var(--font-sans) !important; font-weight: 600 !important;
  cursor: pointer !important; transition: all 0.15s !important; text-align: center !important; padding: 8px 4px !important;
}
.note-ref-btn:hover  { background: rgba(var(--accent-rgb), 0.12) !important; border-color: rgba(var(--accent-rgb), 0.3) !important; color: var(--ink) !important; }
.note-ref-btn.playing { background: rgba(var(--accent-rgb), 0.24) !important; border-color: var(--accent) !important; color: var(--accent) !important; }

/* =====================================================
   CHORD / ROOT GRID BUTTONS
   ===================================================== */
.root-btn, .type-btn, .type-chip {
  background: var(--surface-s) !important; border: 1px solid var(--border) !important;
  color: var(--ink-dim) !important; border-radius: var(--radius-xs) !important;
  font-family: var(--font-sans) !important; font-weight: 600 !important;
  cursor: pointer !important; transition: all 0.15s !important;
}
.root-btn:hover, .type-btn:hover, .type-chip:hover {
  background: rgba(var(--accent-rgb), 0.12) !important; border-color: rgba(var(--accent-rgb), 0.3) !important; color: var(--ink) !important;
}
.root-btn.active, .type-btn.active, .type-chip.active {
  background: rgba(var(--accent-rgb), 0.22) !important; border-color: var(--accent) !important; color: var(--accent) !important;
}

/* Note pills */
.note-pills { display: flex; gap: 6px; flex-wrap: wrap; }
.note-pill {
  padding: 5px 11px; border-radius: 20px; font-size: 13px; font-weight: 700;
  background: rgba(var(--accent-rgb), 0.1); color: var(--ink-dim); border: 1px solid var(--border);
}
.note-pill.root { background: rgba(var(--accent-rgb), 0.24); color: var(--accent); border-color: rgba(var(--accent-rgb), 0.4); }

/* =====================================================
   SCALES (piano keys)
   ===================================================== */
.key-white {
  border: 1px solid rgba(var(--accent-rgb), 0.15) !important;
  border-radius: 0 0 5px 5px !important;
  background: rgba(255,255,255,0.88) !important;
}
.key-white.in-scale { background: rgba(var(--accent-rgb), 0.35) !important; border-color: rgba(var(--accent-rgb), 0.6) !important; }
.key-white.root     { background: var(--accent) !important; border-color: var(--accent) !important; }
.key-white.playing  { background: var(--accent2) !important; box-shadow: 0 0 12px rgba(var(--accent2-rgb), 0.7) !important; }
[data-theme="minimal"] .key-white { background: #fff !important; border-color: rgba(26,26,26,0.15) !important; }
[data-theme="minimal"] .key-white.in-scale { background: rgba(232,90,60,0.25) !important; }

.key-black { background: #0e0e28 !important; border: 1px solid rgba(255,255,255,0.1) !important; }
[data-theme="minimal"] .key-black { background: #2a2a2a !important; }
[data-theme="amber"]   .key-black { background: #1a1208 !important; }
.key-black.in-scale { background: rgba(var(--accent-rgb), 0.55) !important; }
.key-black.root     { background: var(--accent) !important; }
.key-black.playing  { background: var(--accent2) !important; }

.key-label { color: rgba(30,30,60,0.5) !important; }
[data-theme="minimal"] .key-label { color: rgba(26,26,26,0.4) !important; }
.key-white.root .key-label, .key-white.in-scale .key-label { color: white !important; }
[data-theme="minimal"] .key-white.root .key-label,
[data-theme="minimal"] .key-white.in-scale .key-label { color: white !important; }

/* Scale chips */
.scale-chip {
  padding: 7px 14px; border-radius: 20px; border: 1px solid var(--border);
  background: var(--surface-s); color: var(--ink-dim); font-size: 12px; font-weight: 600;
  cursor: pointer; font-family: var(--font-sans); transition: all 0.15s;
}
.scale-chip:hover  { border-color: rgba(var(--accent-rgb), 0.4); color: var(--ink); }
.scale-chip.active { background: rgba(var(--accent-rgb), 0.22); border-color: var(--accent); color: var(--accent); }

/* Scale note pills */
.scale-note-list { display: flex; gap: 6px; flex-wrap: wrap; }
.scale-note-pill {
  padding: 6px 12px; border-radius: 20px; font-size: 14px; font-weight: 700;
  background: rgba(var(--accent-rgb), 0.1); color: var(--ink-dim); border: 1px solid var(--border); transition: background 0.15s;
}
.scale-note-pill.root    { background: rgba(var(--accent-rgb), 0.24); color: var(--accent); border-color: rgba(var(--accent-rgb), 0.4); }
.scale-note-pill.playing { background: rgba(var(--accent2-rgb), 0.22); color: var(--accent2); border-color: rgba(var(--accent2-rgb), 0.4); }

/* =====================================================
   METRONOME
   ===================================================== */
.beat-dot {
  border-radius: 50%;
  background: rgba(var(--accent-rgb), 0.15);
  border: 1px solid rgba(var(--accent-rgb), 0.25);
}
.beat-dot.accent { background: rgba(var(--accent-rgb), 0.28); border-color: rgba(var(--accent-rgb), 0.45); }
.beat-dot.active { background: var(--ink); box-shadow: 0 0 14px rgba(var(--accent-rgb), 0.5); }
.beat-dot.accent.active { background: var(--accent); border-color: var(--accent); box-shadow: 0 0 18px rgba(var(--accent-rgb), 0.9); }

.bpm-btn {
  background: var(--surface-s) !important; border: 1px solid var(--border) !important;
  color: var(--ink-dim) !important; font-family: var(--font-sans) !important;
  border-radius: 50% !important; cursor: pointer !important; transition: all 0.12s !important;
}
.bpm-btn:hover { border-color: rgba(var(--accent-rgb), 0.4) !important; color: var(--accent) !important; background: rgba(var(--accent-rgb), 0.1) !important; }

.tap-btn {
  border: 2px dashed rgba(var(--accent-rgb), 0.35) !important;
  background: rgba(var(--accent-rgb), 0.06) !important;
  color: var(--accent) !important; font-family: var(--font-sans) !important; cursor: pointer !important;
}
.tap-btn:active { background: rgba(var(--accent-rgb), 0.14) !important; transform: scale(0.98) !important; border-style: solid !important; }

.sig-btn, .preset-btn {
  background: var(--surface-s) !important; border: 1px solid var(--border) !important;
  color: var(--ink-dim) !important; font-family: var(--font-sans) !important; cursor: pointer !important; transition: all 0.15s !important;
}
.sig-btn:hover, .preset-btn:hover  { border-color: rgba(var(--accent-rgb), 0.4) !important; color: var(--ink) !important; }
.sig-btn.active, .preset-btn.active { background: rgba(var(--accent-rgb), 0.22) !important; border-color: var(--accent) !important; color: var(--accent) !important; }
.preset-name { color: var(--ink) !important; }
.preset-range { color: var(--muted) !important; }

/* =====================================================
   ENTRENAMIENTO AUDITIVO
   ===================================================== */
.mode-card {
  padding: 14px 6px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--surface-s); color: var(--ink-dim); cursor: pointer;
  font-family: var(--font-sans); text-align: center; transition: all 0.14s;
}
.mode-card:hover  { border-color: rgba(var(--accent-rgb), 0.4); }
.mode-card.active { background: rgba(var(--accent-rgb), 0.14); border-color: var(--accent); }
.mode-name { font-size: 11px; font-weight: 700; color: var(--ink); }

.diff-pill {
  flex: 1; padding: 9px 4px; border-radius: 20px;
  border: 1px solid var(--border); background: var(--surface-s);
  color: var(--ink-dim); font-size: 12px; font-weight: 700;
  cursor: pointer; font-family: var(--font-sans); text-align: center; transition: all 0.14s;
}
.diff-pill:hover  { border-color: rgba(var(--accent-rgb), 0.4); color: var(--ink); }
.diff-pill.active { background: rgba(var(--accent-rgb), 0.22); border-color: var(--accent); color: var(--accent); }

.ans-btn {
  padding: 14px 6px; border-radius: 11px; border: 1px solid var(--border);
  background: var(--surface-s); color: var(--ink); font-size: 12px; font-weight: 700;
  cursor: pointer; font-family: var(--font-sans); text-align: center; transition: all 0.12s;
}
.ans-btn:hover:not(:disabled) { border-color: rgba(var(--accent-rgb), 0.4); color: var(--accent); }
.ans-btn.a-correct { background: rgba(var(--success-rgb),0.14) !important; border-color: var(--success) !important; color: var(--success) !important; }
.ans-btn.a-wrong   { background: rgba(var(--danger-rgb),0.14) !important; border-color: var(--danger) !important; color: var(--danger) !important; }
.ans-btn:disabled  { cursor: default; }

.rules li { font-size: 12px; color: var(--ink-dim); }
.rules li::before { color: var(--accent) !important; }

.go-score { color: var(--accent); text-shadow: var(--accent-glow); }
.go-stat  { background: var(--surface-s) !important; border: 1px solid var(--border) !important; }
.go-val   { color: var(--ink) !important; }
.go-lbl   { color: var(--muted) !important; }

/* Piano in ear training */
.piano-outer { background: rgba(var(--accent-rgb), 0.04) !important; border: 1px solid var(--border) !important; }
.wkey { background: rgba(255,255,255,0.88) !important; border: 1px solid rgba(var(--accent-rgb), 0.1) !important; }
[data-theme="minimal"] .wkey { background: #fff !important; }
.bkey { background: #0e0e28 !important; border: 1px solid rgba(255,255,255,0.1) !important; }
[data-theme="minimal"] .bkey { background: #2a2a2a !important; }
[data-theme="amber"]   .bkey { background: #1a1208 !important; }

/* =====================================================
   INFO BANNERS
   ===================================================== */
.info-banner {
  background: rgba(var(--accent2-rgb), 0.08) !important;
  border-left: 3px solid var(--accent2) !important;
  color: var(--ink-dim) !important;
}

/* =====================================================
   NAV BACK BUTTON (legacy compat)
   ===================================================== */
.nav-back {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--ink-dim); text-decoration: none; font-size: 13px; font-weight: 600;
  padding: 6px 10px; border-radius: 8px; transition: background 0.2s;
}
.nav-back:hover { background: var(--surface-s); color: var(--ink); }

/* =====================================================
   SCROLLBAR STYLING
   ===================================================== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-s); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(var(--accent-rgb), 0.4); }

/* =====================================================
   RESPONSIVE HELPERS
   ===================================================== */
.desktop-only { display: none; }
@media (min-width: 960px) {
  .desktop-only { display: flex; }
  .mobile-only  { display: none; }
}
