:root {
  color-scheme: dark;
  --ink: #f4ecdf;
  --muted: #cbbda8;
  --amber: #e2c48a;
  --night: #070b12;
  font-family: "Yu Gothic UI", "Hiragino Sans", "Segoe UI", sans-serif;
  color: var(--ink);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--night);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(5, 8, 14, 0.12) 0%, rgba(5, 8, 14, 0.22) 36%, rgba(5, 8, 14, 0.72) 100%),
    url("/bg-night.jpg") center 72% / cover no-repeat;
  z-index: -1;
}

h1,
.num,
.clock,
.eyebrow {
  font-family: "Yu Mincho", "Hiragino Mincho ProN", "Times New Roman", serif;
}

button {
  font: inherit;
  color: inherit;
  background: transparent;
  border: 0;
  padding: 0;
}

.mast {
  min-height: 38vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.4rem 1.35rem 1.1rem;
}

.eyebrow {
  margin: 0 0 0.35rem;
  color: var(--amber);
  letter-spacing: 0.46em;
  font-size: 0.74rem;
}

h1 {
  margin: 0;
  font-size: 3.1rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-shadow: 0 8px 28px rgba(0, 0, 0, 0.75);
}

.lede,
.muted {
  color: var(--muted);
  line-height: 1.6;
}

.lede {
  margin: 0.45rem 0 0;
}

main {
  padding: 0.4rem 1.2rem 2.8rem;
}

#chapters {
  margin: 0.4rem 0 0;
  padding: 0;
  list-style: none;
}

.chapter {
  display: flex;
  width: 100%;
  gap: 0.85rem;
  align-items: center;
  text-align: left;
  padding: 0.9rem 0.15rem;
  border-bottom: 1px solid rgba(226, 196, 138, 0.2);
}

.chapter .num {
  width: 2.1rem;
  color: var(--amber);
  font-size: 1.2rem;
}

.chapter strong {
  display: block;
  font-weight: 500;
}

.chapter small {
  color: var(--muted);
}

.chapter:disabled {
  opacity: 0.42;
}

#install,
#play,
#quiz-start,
#quiz button {
  border-radius: 999px;
}

#install,
#quiz-start {
  margin-top: 0.8rem;
  border: 1px solid rgba(226, 196, 138, 0.55);
  padding: 0.55rem 0.95rem;
}

#listen {
  min-height: 100dvh;
  padding: 30vh 1.25rem 2.6rem;
  background: linear-gradient(180deg, rgba(5, 8, 14, 0.05) 0%, rgba(5, 8, 14, 0.55) 28%, rgba(5, 8, 14, 0.9) 48%);
}

#back {
  color: var(--amber);
  letter-spacing: 0.08em;
}

#listen h1 {
  margin-top: 0.8rem;
  font-size: 1.8rem;
  letter-spacing: 0.08em;
}

.clock {
  margin: 0.3rem 0 0.8rem;
  font-size: 2.35rem;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

#play {
  display: block;
  width: 100%;
  background: var(--amber);
  color: #1b140c;
  padding: 0.85rem 1rem;
  font-size: 1.05rem;
}

#speeds,
#segments {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.85rem;
}

.chip {
  border: 1px solid rgba(226, 196, 138, 0.5);
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
}

.chip[aria-pressed="true"] {
  background: var(--amber);
  color: #1b140c;
}

#quiz {
  display: grid;
  gap: 0.55rem;
  margin-top: 0.8rem;
}

#quiz button {
  width: 100%;
  text-align: left;
  border: 1px solid rgba(226, 196, 138, 0.4);
  border-radius: 0.8rem;
  padding: 0.75rem 0.85rem;
  background: rgba(7, 11, 18, 0.45);
}

#done {
  color: var(--amber);
}

#talk {
  margin-top: 1.6rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(226, 196, 138, 0.28);
}

#talk h2 {
  margin: 0 0 0.4rem;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

#talk-slots,
#talk-hints {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.7rem 0;
}

.slot,
.hint {
  border: 1px solid rgba(226, 196, 138, 0.45);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
}

.slot.filled {
  background: var(--amber);
  color: #1b140c;
}

#talk-log p {
  margin: 0.35rem 0;
}

#talk textarea {
  display: block;
  width: 100%;
  min-height: 4.5rem;
  margin-top: 0.35rem;
  padding: 0.7rem;
  color: inherit;
  background: rgba(7, 11, 18, 0.55);
  border: 1px solid rgba(226, 196, 138, 0.45);
  border-radius: 0.8rem;
  font: inherit;
}

#talk-mic,
#talk-send,
#talk-reset {
  display: block;
  width: 100%;
  margin-top: 0.6rem;
  border-radius: 999px;
  padding: 0.75rem;
}

#talk-mic {
  border: 1px solid rgba(226, 196, 138, 0.45);
}

#talk-mic[aria-pressed="true"] {
  background: #8f3b3b;
  color: #f4efe6;
}

#talk-send {
  background: var(--amber);
  color: #1b140c;
}

#talk-review {
  white-space: pre-line;
}

#talk-reset {
  border: 1px solid rgba(226, 196, 138, 0.45);
}

#steps {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.8rem 0;
}

#steps button,
#notes-open,
#practice button,
#notebook button {
  border: 1px solid rgba(226, 196, 138, 0.45);
  border-radius: 999px;
  padding: 0.45rem 0.75rem;
  background: transparent;
  color: inherit;
}

#steps button[aria-pressed="true"] {
  background: var(--amber);
  color: #1b140c;
}

#practice,
#notebook {
  display: grid;
  gap: 0.7rem;
  margin-top: 0.8rem;
}

#practice p,
#notebook p {
  margin: 0.25rem 0;
  white-space: pre-line;
}

.token {
  border: 1px solid rgba(226, 196, 138, 0.45);
  border-radius: 999px;
  padding: 0.4rem 0.7rem;
}

.token[aria-pressed="true"] {
  background: var(--amber);
  color: #1b140c;
}

.hidden {
  display: none;
}