.introApp { max-width: 1080px; margin: auto; padding: 24px; }
.introHeader { margin: 36px 0 24px; }
.introHeader h1 { font-size: 34px; margin: 8px 0; }
.introHeader p:last-child,.introNote { color: var(--muted); line-height: 1.7; }
.eyebrow { color: var(--accent); font-size: 12px; letter-spacing: 1.4px; font-weight: 700; }
.introOptions,.playerFooter,.scriptHeading { display: flex; justify-content: space-between; gap: 16px; align-items: center; flex-wrap: wrap; }
.introOptions { margin-bottom: 16px; color: var(--muted); }
.introPlayer { padding: 30px; border: 1px solid var(--line); border-radius: 18px; background: white; }
#currentEnglish { font-size: clamp(25px,4vw,37px); line-height: 1.4; font-weight: 600; margin: 22px 0 12px; }
.translation { font-size: 19px; color: var(--muted); line-height: 1.6; }
.hint { color: var(--accent); font-size: 15px; line-height: 1.7; }
.playerControls { display: flex; gap: 10px; flex-wrap: wrap; margin: 26px 0 18px; }
.introApp button,.introApp select { border-radius: 9px; padding: 11px 15px; }
.introApp button:focus-visible,.introApp select:focus-visible { outline: 3px solid #75afa2; outline-offset: 3px; }
.introApp button:disabled { opacity: .4; cursor: default; }
.introApp button.primary { background: var(--accent); border-color: var(--accent); color: white; }
.playerFooter { border-top: 1px solid var(--line); padding-top: 18px; font-size: 14px; }
#playStatus { color: var(--accent); min-height: 24px; line-height: 1.5; margin-bottom: 0; }
.introScript { margin-top: 32px; }
.scriptHeading h2 { font-size: 22px; }.scriptHeading span { color: var(--muted); font-size: 14px; }
#sentenceList { display: grid; gap: 8px; }
.introApp .sentence { display: flex; align-items: flex-start; gap: 16px; width: 100%; text-align: left; padding: 18px; line-height: 1.6; background: transparent; }
.introApp .sentence[aria-current="true"] { background: #e9f1ed; border-color: #8bafa3; }
.sentence .number { color: var(--accent); font-size: 13px; min-width: 22px; padding-top: 3px; }.sentence .en { display: block; font-size: 18px; }.sentence .zh { display: block; color: var(--muted); font-size: 15px; margin-top: 5px; }
.introNote { font-size: 13px; margin: 24px 0; }
.hideChinese .translation,.hideChinese .zh { display: none; }
@media(max-width:600px) { .introApp { padding: 14px; }.introPlayer { padding: 20px; }.introHeader { margin-top: 24px; }.playerControls button { flex: 1 1 42%; }.scriptHeading { gap: 0; }.introApp .sentence { padding: 14px; } }

/* Word pronunciation works in both the player and the full passage. */
.introApp .sentence { border: 1px solid var(--line); border-radius: 9px; cursor: pointer; }
.introApp .sentence .number { padding: 4px 6px; min-width: 32px; background: white; flex-shrink: 0; }
.introApp button.wordTap { display: inline; font: inherit; color: inherit; line-height: inherit; padding: 2px 0; border: 0; border-radius: 4px; background: transparent; text-align: inherit; text-decoration: underline dotted #a8bfb5; text-underline-offset: 5px; cursor: pointer; }
.introApp button.wordTap:hover, .introApp button.wordTap.speakingWord { background: #d7ebe2; color: #205548; }
.introApp button.wordTap:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }