/* ============================================================
   e_music_tools – shared styles
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #1a1a2e;
  --surface:   #16213e;
  --card:      #0f3460;
  --accent:    #e94560;
  --accent2:   #f5a623;
  --text:      #eaeaea;
  --muted:     #8892a4;
  --radius:    12px;
  --shadow:    0 4px 24px rgba(0,0,0,.4);
  --font:      'Segoe UI', system-ui, sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---- top nav ---- */
.topnav {
  background: var(--surface);
  padding: .75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,.4);
  flex-wrap: wrap;
}
.topnav .brand {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: .04em;
}
.topnav a {
  color: var(--muted);
  text-decoration: none;
  font-size: .95rem;
  transition: color .2s;
}
.topnav a:hover, .topnav a.active { color: var(--text); }

/* ---- main content ---- */
main {
  flex: 1;
  padding: 2rem 1.5rem;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
}

h1 { font-size: 1.8rem; margin-bottom: .4rem; }
h2 { font-size: 1.3rem; margin-bottom: 1rem; color: var(--muted); font-weight: 400; }

/* ---- card ---- */
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

/* ---- buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .55rem 1.2rem;
  border: none;
  border-radius: 8px;
  font-size: .95rem;
  font-family: var(--font);
  font-weight: 600;
  cursor: pointer;
  transition: filter .15s, transform .1s;
  user-select: none;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-secondary { background: var(--surface); color: var(--text); border: 1px solid #334; }
.btn-accent2 { background: var(--accent2); color: #1a1a2e; }

.btn:hover { filter: brightness(1.15); }

/* ---- range / slider ---- */
input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 3px;
  background: var(--surface);
  outline: none;
  cursor: pointer;
  width: 100%;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}
input[type=range]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

/* ---- index grid ---- */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.app-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  transition: transform .2s, filter .2s;
}
.app-card:hover { transform: translateY(-4px); filter: brightness(1.1); }
.app-card .icon { font-size: 3rem; }
.app-card .label { font-weight: 600; font-size: 1.1rem; }
.app-card .desc { color: var(--muted); font-size: .85rem; text-align: center; }

/* ---- footer ---- */
footer {
  text-align: center;
  padding: 1rem;
  color: var(--muted);
  font-size: .8rem;
}