:root {
  --bg-1: #081625;
  --bg-2: #0d2843;
  --bg-3: #133a52;
  --panel: rgba(255, 255, 255, 0.1);
  --panel-strong: rgba(255, 255, 255, 0.16);
  --line: rgba(255, 255, 255, 0.22);
  --text: #ecf4ff;
  --text-dim: #c5d8ee;
  --accent: #45d4ff;
  --accent-warm: #ffca70;
  --ok: #55df95;
  --miss: #ff7f7f;
  --tap: 44px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Trebuchet MS", "Segoe UI", Tahoma, sans-serif;
  background: radial-gradient(circle at 20% 20%, var(--bg-3), transparent 45%),
    radial-gradient(circle at 80% 0%, #1a5878, transparent 35%),
    linear-gradient(140deg, var(--bg-1), var(--bg-2) 50%, #08253f 100%);
  color: var(--text);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(120deg, rgba(255, 255, 255, 0.06), transparent 30%),
    repeating-linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.02) 0,
      rgba(255, 255, 255, 0.02) 1px,
      transparent 1px,
      transparent 70px
    );
  animation: drift 12s linear infinite;
}

@keyframes drift {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-70px);
  }
}

#app {
  width: min(1100px, 100%);
  margin: 0 auto;
  padding: 12px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  backdrop-filter: blur(8px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
}

header.panel {
  padding: 14px;
  display: grid;
  gap: 12px;
}

.hero-header {
  position: relative;
  overflow: hidden;
  background-image:
    linear-gradient(135deg, rgba(5, 18, 31, 0.78), rgba(8, 27, 45, 0.74)),
    url("../assets/img/hero-bg-1920x1080.png"),
    url("assets/img/hero-bg-1920x1080.png"),
    url("data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1600 900'%3E%3Cdefs%3E%3ClinearGradient id='g' x1='0' y1='0' x2='1' y2='1'%3E%3Cstop offset='0' stop-color='%23143a57'/%3E%3Cstop offset='1' stop-color='%23081f34'/%3E%3C/linearGradient%3E%3C/defs%3E%3Crect width='1600' height='900' fill='url(%23g)'/%3E%3Cpath d='M0 660 L420 460 L780 620 L1150 420 L1600 580 L1600 900 L0 900 Z' fill='%23245f82' fill-opacity='0.36'/%3E%3C/svg%3E");
  background-size: cover, cover, cover, cover;
  background-position: center;
}

.hero-header > * {
  position: relative;
  z-index: 1;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: clamp(1.5rem, 3.7vw, 2.3rem);
  line-height: 1.1;
}

h2 {
  font-size: clamp(1.2rem, 3.2vw, 1.8rem);
}

p,
label,
button,
input,
select {
  font-size: 1rem;
}

button,
select,
input[type="text"],
input[type="number"] {
  min-height: var(--tap);
  border-radius: 12px;
  border: 1px solid var(--line);
  color: var(--text);
  background: rgba(4, 17, 30, 0.62);
  padding: 8px 12px;
}

button {
  cursor: pointer;
  font-weight: 700;
  letter-spacing: 0.2px;
}

button:hover,
button:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.toolbar,
.row,
.grid {
  display: grid;
  gap: 10px;
}

.toolbar {
  grid-template-columns: repeat(auto-fit, minmax(145px, 1fr));
}

.grid {
  grid-template-columns: repeat(12, 1fr);
}

.span-12 {
  grid-column: span 12;
}

.span-6 {
  grid-column: span 12;
}

.mode-nav {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.mode-tab.active {
  border-color: var(--accent);
  background: rgba(69, 212, 255, 0.17);
}

.card {
  padding: 12px;
}

.subtle {
  color: var(--text-dim);
}

.status {
  font-weight: 700;
}

.audio-banner {
  display: none;
  padding: 10px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 116, 116, 0.14);
  align-items: center;
  gap: 8px;
}

.audio-banner.show {
  display: flex;
  flex-wrap: wrap;
}

.hub-cards {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.mode-tile {
  position: relative;
  overflow: hidden;
  min-height: 170px;
  padding-top: 44px;
}

.mode-tile h3,
.mode-tile p {
  position: relative;
  z-index: 1;
}

.mode-tile::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 19, 32, 0.2), rgba(7, 19, 32, 0.68));
  pointer-events: none;
}

.mode-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(69, 212, 255, 0.2);
  border: 1px solid rgba(69, 212, 255, 0.5);
  font-size: 0.82rem;
  font-weight: 700;
  pointer-events: none;
}

.mode-tile-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.mode {
  display: none;
}

.mode.active {
  display: grid;
  gap: 10px;
}

.note-pad {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.note-btn {
  min-height: 54px;
  font-weight: 700;
}

.seq-grid {
  display: grid;
  gap: 6px;
  grid-template-columns: repeat(16, minmax(32px, 1fr));
}

.seq-step {
  min-height: var(--tap);
  padding: 4px;
  font-size: 0.86rem;
}

.seq-step.active {
  background: rgba(69, 212, 255, 0.22);
}

.seq-step.playhead {
  border-color: var(--accent-warm);
}

.slider-wrap {
  display: grid;
  gap: 4px;
}

.slider-wrap input[type="range"] {
  width: 100%;
}

.instrument-picker {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
}

.instrument-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: flex-start;
}

.instrument-chip.active {
  border-color: var(--accent);
  background: rgba(69, 212, 255, 0.17);
}

.chip-thumb,
.instrument-thumb {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.4);
  flex: 0 0 auto;
}

.det-thumb-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: var(--tap);
  padding: 6px 8px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(5, 20, 34, 0.45);
}

canvas {
  width: 100%;
  background: rgba(4, 16, 30, 0.72);
  border-radius: 14px;
  border: 1px solid var(--line);
}

.rhythm-lanes {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.lane-btn {
  min-height: 68px;
  font-size: 1.15rem;
}

.lane-btn.flash {
  background: rgba(85, 223, 149, 0.22);
}

.meter {
  width: 100%;
  height: 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  overflow: hidden;
}

.meter > span {
  display: block;
  height: 100%;
  width: 40%;
  background: linear-gradient(90deg, #ffc46a, #5ce0a5);
}

.choice-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.feedback.good {
  color: var(--ok);
}

.feedback.bad {
  color: var(--miss);
}

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

kbd {
  display: inline-block;
  border-radius: 6px;
  border: 1px solid var(--line);
  padding: 2px 6px;
  background: rgba(8, 30, 54, 0.85);
}

.decorative-img {
  pointer-events: none;
  user-select: none;
}

.update-toast {
  position: fixed;
  right: 12px;
  bottom: 12px;
  z-index: 25;
  display: grid;
  gap: 8px;
  padding: 10px;
  max-width: 240px;
}

.info-toast {
  position: fixed;
  left: 12px;
  bottom: 12px;
  z-index: 26;
  padding: 10px;
}

body.projector {
  --panel: rgba(255, 255, 255, 0.2);
  --panel-strong: rgba(255, 255, 255, 0.28);
  --line: rgba(255, 255, 255, 0.35);
  --text: #ffffff;
  --text-dim: #eff6ff;
  font-size: 1.08rem;
}

@media (min-width: 780px) {
  #app {
    padding: 16px;
  }

  .span-6 {
    grid-column: span 6;
  }

  .note-pad {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }
}