:root {
  --bg: #000;
  --fg: #fff;
  --dim: #8a8a8a;
  --line: #1d1d1d;
  --line-strong: #333;
  --hover: #161616;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 20px 120px;
}

/* ---------- Header ---------- */
.head { margin-bottom: 48px; }

.title {
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
}

.total {
  font-size: clamp(20px, 3.5vw, 28px);
  font-family: var(--mono);
  color: var(--fg);
  margin: 10px 0 0;
  letter-spacing: -0.01em;
}

/* ---------- Library ---------- */
.library { margin-top: 8px; }

.empty, .loading { color: var(--dim); font-size: 14px; }
.empty code {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg);
  background: #111;
  border: 1px solid var(--line);
  padding: 1px 6px;
  border-radius: 3px;
}

.cat {
  margin: 40px 0 8px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.cat-name {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  font-weight: 600;
}
.cat-count { font-size: 12px; color: var(--dim); margin-left: 8px; }

.recent-cat { margin-top: 0; text-align: center; }

.teacher {
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.04em;
  margin: 22px 0 4px;
}

.track {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 11px 12px;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition: background .12s, border-color .12s;
}
.track:hover { background: var(--hover); border-color: var(--line); }
.track-left { display: flex; align-items: baseline; gap: 10px; min-width: 0; }
.track-title {
  font-size: 15px;
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.track-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.track-dur { font-size: 12px; color: var(--dim); font-family: var(--mono); min-width: 42px; text-align: right; }

.play-ico {
  width: 26px; height: 26px; border-radius: 50%;
  border: 1px solid var(--line-strong);
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--fg); font-size: 10px; line-height: 1;
  transition: border-color .12s, background .12s;
}
.track:hover .play-ico { border-color: var(--fg); background: #fff; color: #000; }

/* ---------- Player ---------- */
.player {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.96);
  display: flex; align-items: center; justify-content: center;
  z-index: 50;
}
.player[hidden] { display: none; }
.player-inner {
  width: min(640px, 92vw);
  padding: 28px;
  position: relative;
}
.close {
  position: absolute; top: 4px; right: 6px;
  background: transparent; border: none; color: var(--dim);
  font-size: 30px; line-height: 1; cursor: pointer;
  transition: color .15s;
}
.close:hover { color: var(--fg); }

.player-cat { font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--dim); margin: 0 0 6px; }
.player-title { font-size: 22px; font-weight: 600; margin: 0 0 32px; letter-spacing: -0.01em; }

.player-progress { display: flex; align-items: center; gap: 14px; }
.time { font-family: var(--mono); font-size: 13px; color: var(--dim); min-width: 40px; }
.time.r { text-align: right; }

.seek {
  -webkit-appearance: none; appearance: none;
  flex: 1; height: 3px; background: var(--line-strong); border-radius: 2px;
  cursor: pointer;
}
.seek::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 14px; height: 14px; border-radius: 50%; background: var(--fg);
}
.seek::-moz-range-thumb { width: 14px; height: 14px; border: none; border-radius: 50%; background: var(--fg); }

.play {
  display: block; margin: 28px auto 0;
  width: 64px; height: 64px; border-radius: 50%;
  background: var(--fg); color: #000; border: none;
  font-size: 22px; cursor: pointer;
  transition: opacity .15s, transform .1s;
}
.play:hover { opacity: .85; }
.play:active { transform: scale(0.96); }

/* ---------- Completion overlay ---------- */
.complete {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.97);
  display: flex; align-items: center; justify-content: center;
  z-index: 60;
  padding: 24px;
}
.complete[hidden] { display: none; }
.complete-inner {
  width: min(640px, 92vw);
  text-align: center;
}
.complete-label {
  font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--dim); margin: 0 0 28px;
}
.quote {
  margin: 0 auto;
  max-width: 30em;
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.45;
  color: var(--fg);
  font-weight: 400;
}
.author { margin: 18px 0 0; font-size: 13px; color: var(--dim); }
.complete-total {
  margin: 40px 0 0;
  display: flex; flex-direction: column; gap: 4px;
}
.complete-total-label { font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--dim); }
.complete-total strong { font-family: var(--mono); font-size: 18px; font-weight: 500; color: var(--fg); }
.complete-actions { margin-top: 36px; display: flex; gap: 12px; justify-content: center; }
.complete-actions button {
  font: inherit; font-size: 13px;
  color: var(--dim); background: transparent;
  border: 1px solid var(--line-strong);
  padding: 8px 18px; border-radius: 4px; cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
}
.complete-actions button:hover { color: var(--fg); border-color: var(--fg); background: var(--hover); }
.complete-actions button.primary { color: #000; background: var(--fg); border-color: var(--fg); }
.complete-actions button.primary:hover { opacity: .85; background: var(--fg); }

/* ---------- Login ---------- */
.login { max-width: 360px; padding-top: 18vh; }
.login .title { margin-bottom: 32px; }
.login-form { display: flex; flex-direction: column; gap: 16px; }
.login-form label { display: flex; flex-direction: column; gap: 6px; }
.login-form label span {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  font-weight: 600;
}
.login-form input {
  font: 16px var(--mono);
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  padding: 10px 12px;
  outline: none;
}
.login-form input:focus { border-color: var(--fg); }
.login-form button.primary {
  margin-top: 8px;
  font: 600 14px var(--sans);
  color: #000;
  background: var(--fg);
  border: 1px solid var(--fg);
  border-radius: 4px;
  padding: 11px 16px;
  cursor: pointer;
}
.login-form button.primary:hover { opacity: .85; }
.login-form button.primary:disabled { opacity: .5; cursor: default; }
.login-error { min-height: 1.2em; margin: 0; font-size: 14px; color: var(--dim); }

.logout {
  float: right;
  font: 12px var(--sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--dim);
  background: none;
  border: none;
  padding: 4px 0;
  cursor: pointer;
}
.logout:hover { color: var(--fg); }

@media (max-width: 560px) {
  .wrap { padding: 32px 16px 100px; }
  .track-dur { min-width: 36px; }
}