:root {
  --course-paper: #f8f4ec;
  --course-paper-strong: #fffdf8;
  --course-ink: #1d2a36;
  --course-navy: #263e55;
  --course-navy-deep: #172a3a;
  --course-rust: #b95c24;
  --course-rust-deep: #823d18;
  --course-yellow: #f6c84f;
  --course-green: #50715d;
  --course-line: rgba(29, 42, 54, .18);
  --course-shadow: 0 22px 54px rgba(23, 42, 58, .18);
  --course-design-width: 1920px;
  --course-design-height: 1080px;
}

* { box-sizing: border-box; }

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body.course-page,
body[data-course-slide] {
  overflow: hidden;
  background: #101b25;
  color: var(--course-ink);
  font-family: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}

button,
select,
input { font: inherit; }

[hidden] { display: none !important; }

.course-shell {
  width: 100%;
  height: 100dvh;
  display: grid;
  grid-template-rows: minmax(0, 1fr) 76px;
  overflow: hidden;
  background: #101b25;
}

.course-viewport,
.course-stage-wrap {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-color: rgba(246, 200, 79, .65) rgba(255, 255, 255, .06);
  touch-action: pan-x pan-y;
}

.course-stage {
  position: relative;
  flex: none;
}

.course-canvas {
  position: absolute;
  inset: 0 auto auto 0;
  width: var(--course-design-width);
  height: var(--course-design-height);
  overflow: hidden;
  transform-origin: 0 0;
  background-color: var(--course-paper);
  background-image:
    linear-gradient(rgba(29, 42, 54, .025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 42, 54, .025) 1px, transparent 1px);
  background-size: 32px 32px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .42);
}

.course-orientation-note {
  position: fixed;
  z-index: 100;
  inset: 18px 18px auto;
  display: none;
  padding: 12px 18px;
  border: 1px solid var(--course-yellow);
  background: var(--course-navy-deep);
  color: white;
  font-size: 16px;
  font-weight: 800;
  text-align: center;
}

.course-nav,
.course-toolbar {
  position: relative;
  z-index: 80;
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(150px, auto) minmax(0, 1fr) minmax(154px, auto);
  align-items: center;
  gap: 14px;
  padding: 10px 16px;
  border-top: 1px solid rgba(255, 255, 255, .16);
  background: rgba(23, 42, 58, .98);
  color: white;
  box-shadow: 0 -12px 30px rgba(0, 0, 0, .24);
}

.course-toolbar {
  grid-template-columns: auto minmax(0, 1fr) 1fr auto auto;
}

.course-toolbar .deck-label {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-toolbar .nav-spacer { min-width: 0; }

.course-nav__middle,
.course-toolbar__middle {
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.course-nav__position {
  overflow: hidden;
  color: rgba(255, 255, 255, .74);
  font-size: 15px;
  font-weight: 800;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-nav__link,
.course-nav__disabled,
.course-nav__library {
  min-width: 150px;
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 18px;
  border: 1px solid rgba(255, 255, 255, .22);
  background: rgba(255, 255, 255, .08);
  color: white;
  font-weight: 900;
  text-decoration: none;
  touch-action: manipulation;
}

.course-nav__link:hover { background: rgba(255, 255, 255, .15); }
.course-nav__disabled { opacity: .3; }
.course-nav__library { min-width: 52px; padding-inline: 14px; }

.course-toolbar > a,
.course-toolbar > button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border: 1px solid rgba(255, 255, 255, .22);
  background: rgba(255, 255, 255, .08);
  color: white;
  font-weight: 900;
  text-decoration: none;
  touch-action: manipulation;
}

.course-touch-target,
.course-canvas button,
.course-canvas [role="button"],
.course-canvas select,
.course-canvas input[type="file"] {
  min-width: 96px;
  min-height: 96px;
  touch-action: manipulation;
}

.course-header {
  height: 126px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 34px;
  padding: 20px 54px;
  border-bottom: 2px solid var(--course-ink);
  background: rgba(255, 253, 248, .94);
}

.course-header__identity {
  margin: 0 0 5px;
  color: var(--course-rust-deep);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: .08em;
}

.course-header__title {
  margin: 0;
  font-size: 48px;
  line-height: 1.08;
  text-wrap: balance;
}

/* Generator-compatible lesson structure. */
body[data-course-slide] .course-canvas {
  display: grid;
  grid-template-rows: 126px minmax(0, 1fr) 72px;
}

.lesson-header {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
  padding: 18px 54px;
  border-bottom: 2px solid var(--course-ink);
  background: rgba(255, 253, 248, .95);
}

.lesson-header h1 {
  margin: 0;
  font-size: 48px;
  line-height: 1.08;
  text-wrap: balance;
}

.lesson-id {
  margin: 0 0 5px;
  color: var(--course-rust-deep);
  font-size: 24px;
  font-weight: 900;
  letter-spacing: .07em;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 14px;
}

.header-tools button,
.header-tools a {
  min-width: 150px;
  min-height: 96px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border: 2px solid var(--course-navy);
  background: transparent;
  color: var(--course-navy);
  cursor: pointer;
  font-size: 24px;
  font-weight: 900;
  text-decoration: none;
}

.journey {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(29, 42, 54, .55);
  font-size: 24px;
  font-weight: 800;
}

.journey span {
  max-width: 220px;
  padding: 10px 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.journey span[aria-current="step"],
.journey .is-current { background: var(--course-yellow); color: var(--course-ink); }
.journey i { width: 34px; height: 2px; background: rgba(29, 42, 54, .22); }

.slide-main {
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  padding: 32px 54px;
}

.teach-layout,
.action-layout {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  gap: 40px;
}

.teaching-copy,
.action-copy {
  min-width: 0;
  display: grid;
  align-content: start;
  gap: 18px;
}

.action-copy { gap: 12px; }

.teaching-copy h2,
.action-copy h2,
.physical-brief h2 {
  margin: 0;
  font-size: 64px;
  line-height: 1.12;
  text-wrap: balance;
}

.action-copy h2 { font-size: 56px; }

.eyebrow {
  margin: 0;
  color: var(--course-rust-deep);
  font-size: 24px;
  font-weight: 900;
  letter-spacing: .08em;
}

.lead-copy {
  margin: 0;
  font-size: 30px;
  line-height: 1.55;
  text-wrap: pretty;
}

.visual-lab {
  position: relative;
  min-width: 0;
  min-height: 0;
  padding: 28px;
  overflow: hidden;
  border: 2px solid var(--course-navy);
  background: var(--course-navy-deep);
  color: white;
  box-shadow: var(--course-shadow);
}

.prompt-tickets {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.prompt-ticket {
  min-height: 112px;
  display: grid;
  align-content: center;
  padding: 16px 20px;
  border: 2px solid var(--course-navy);
  background: var(--course-paper-strong);
  font-size: 24px;
  font-weight: 900;
  line-height: 1.38;
}

.choice-message,
.task-message,
.reveal-panel,
.say-line {
  min-height: 96px;
  padding: 18px 22px;
  border-left: 10px solid var(--course-yellow);
  background: #fff7ce;
  color: var(--course-ink);
  font-size: 24px;
  font-weight: 800;
  line-height: 1.45;
}

.action-copy .task-message { min-height: 72px; padding-block: 12px; }

.real-card-gallery {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 34px;
}

.real-card {
  min-width: 0;
  display: grid;
  justify-items: center;
  gap: 12px;
  color: white;
  font-size: 24px;
  font-weight: 900;
  text-align: center;
}

.real-card img {
  display: block;
  width: min(420px, 100%);
  max-height: 700px;
  object-fit: contain;
  border-radius: 18px;
  box-shadow: 0 18px 42px rgba(0, 0, 0, .4);
}

.physical-brief {
  min-width: 0;
  display: grid;
  align-content: start;
  gap: 20px;
}

.action-copy .physical-brief {
  grid-template-columns: 160px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
}

.physical-brief > span {
  color: var(--course-rust-deep);
  font-size: 24px;
  font-weight: 900;
}

.physical-brief > strong { font-size: 24px; line-height: 1.4; }

.task-checklist {
  display: grid;
  gap: 10px;
}

.task-toggle,
.reveal-button {
  width: 100%;
  min-height: 104px;
  padding: 18px 24px;
  border: 2px solid var(--course-navy);
  background: var(--course-paper-strong);
  color: var(--course-ink);
  cursor: pointer;
  font-size: 26px;
  font-weight: 900;
  line-height: 1.35;
  text-align: left;
}

.task-toggle { min-height: 96px; }

.task-toggle[aria-pressed="true"] { background: var(--course-green); color: white; }
.reveal-button { background: var(--course-navy); color: white; }
.reveal-button:disabled { opacity: .42; cursor: default; }
.reveal-panel { border: 2px solid var(--course-ink); border-left-width: 10px; background: white; }

.physical-table {
  min-width: 0;
  display: grid;
  gap: 12px;
  padding: 22px;
  border: 2px solid var(--course-navy);
  background: var(--course-paper-strong);
}

.physical-table > * {
  min-width: 0;
  font-size: 24px;
  line-height: 1.4;
}

.physical-table > .real-card-gallery {
  height: auto;
  min-height: 0;
  align-self: stretch;
  overflow: hidden;
}

.physical-table .real-card img { width: auto; max-width: 360px; max-height: 520px; }

.table-label {
  margin: 0;
  padding: 10px 16px;
  border-bottom: 1px solid var(--course-line);
  color: var(--course-rust-deep);
  font-size: 24px;
  font-weight: 900;
}

.physical-table .say-line { margin: 0; }

.mini-board {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding: 24px;
  border: 2px solid #6e8397;
  background: var(--course-navy-deep);
  color: white;
  box-shadow: var(--course-shadow);
}

.board-zone {
  position: relative;
  min-width: 0;
  min-height: 120px;
  display: grid;
  place-items: center;
  padding: 18px;
  border: 2px dashed rgba(255, 255, 255, .4);
  background: rgba(255, 255, 255, .055);
  color: rgba(255, 255, 255, .82);
  font-size: 24px;
  font-weight: 900;
  text-align: center;
}

.teacher-panel,
.ability-drawer {
  position: absolute;
  z-index: 65;
  top: 24px;
  right: 24px;
  width: 760px;
  max-height: 1032px;
  padding: 28px;
  overflow: auto;
  border: 3px solid var(--course-yellow);
  background: var(--course-navy-deep);
  color: white;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .45);
  transform: translateX(calc(100% + 60px));
  transition: transform .2s ease;
}

.teacher-panel.is-open,
.ability-drawer.is-open { transform: translateX(0); }

.teacher-panel h2,
.ability-drawer h2 { margin: 0; color: var(--course-yellow); font-size: 36px; }
.teacher-panel h3,
.ability-drawer h3 { margin: 22px 0 8px; font-size: 28px; }
.teacher-panel p,
.teacher-panel li,
.ability-drawer p,
.ability-drawer li { font-size: 24px; line-height: 1.5; }

.teacher-time {
  display: inline-flex;
  min-height: 54px;
  align-items: center;
  padding: 8px 14px;
  border: 1px solid var(--course-yellow);
  color: var(--course-yellow);
  font-size: 24px;
  font-weight: 900;
}

.ability-open {
  width: 100%;
  min-height: 96px;
  padding: 16px 20px;
  border: 0;
  background: var(--course-yellow);
  color: var(--course-ink);
  cursor: pointer;
  font-size: 24px;
  font-weight: 900;
}

.plain-list {
  display: grid;
  gap: 10px;
  margin: 10px 0;
  padding-left: 30px;
}

.official-source {
  display: block;
  margin-top: 18px;
  color: var(--course-yellow);
  font-size: 24px;
  font-weight: 800;
  line-height: 1.4;
}

.teacher-close,
.ability-close,
[data-ability-close] {
  width: 100%;
  min-height: 96px;
  margin-top: 18px;
  border: 1px solid white;
  background: transparent;
  color: white;
  cursor: pointer;
  font-size: 24px;
  font-weight: 900;
}

.ability-fields,
[data-ability-fields] { display: grid; gap: 8px; }

.ability-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 96px;
  align-items: start;
  gap: 18px;
}

.ability-head p { margin: 0 0 4px; color: var(--course-yellow); font-size: 20px; font-weight: 900; }
.ability-head [data-ability-close] { width: 96px; min-width: 96px; min-height: 96px; margin: 0; font-size: 34px; }

.ability-field {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
}

.ability-label { color: white; font-size: 24px; font-weight: 900; }
.ability-levels,
.ability-scale { display: grid; grid-template-columns: repeat(4, minmax(96px, 1fr)); gap: 9px; }

.ability-level,
.ability-value {
  min-width: 96px;
  min-height: 96px;
  border: 1px solid rgba(255, 255, 255, .36);
  background: rgba(255, 255, 255, .08);
  color: white;
  cursor: pointer;
  font-size: 26px;
  font-weight: 900;
}

.ability-level[aria-pressed="true"],
.ability-value[aria-pressed="true"] { border-color: var(--course-yellow); background: var(--course-yellow); color: var(--course-ink); }

.ability-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 18px;
}

.ability-actions button,
.ability-actions label {
  min-height: 96px;
  display: grid;
  place-items: center;
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, .36);
  background: rgba(255, 255, 255, .08);
  color: white;
  cursor: pointer;
  font-size: 24px;
  font-weight: 900;
  text-align: center;
}

.import-label { position: relative; overflow: hidden; }
.import-label input[type="file"] { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer; }

.ability-status,
[data-ability-status] { min-height: 36px; color: var(--course-yellow); font-size: 24px; }

.ability-note {
  display: grid;
  gap: 8px;
  margin-top: 14px;
  color: white;
  font-size: 24px;
  font-weight: 900;
}

.ability-note textarea {
  width: 100%;
  min-height: 110px;
  padding: 12px 14px;
  resize: vertical;
  border: 1px solid rgba(255, 255, 255, .36);
  background: rgba(255, 255, 255, .08);
  color: white;
  font-size: 24px;
  line-height: 1.45;
}

.page-footer {
  min-width: 0;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 0 54px;
  border-top: 1px solid var(--course-line);
  background: var(--course-paper-strong);
  color: rgba(29, 42, 54, .72);
  font-size: 24px;
  font-weight: 800;
}

.library-link,
.deck-label,
.nav-button,
.nav-disabled,
.finish-link {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border: 1px solid rgba(255, 255, 255, .22);
  background: rgba(255, 255, 255, .08);
  color: white;
  font-size: 16px;
  font-weight: 900;
  text-decoration: none;
}

.nav-button,
.finish-link { cursor: pointer; }
.nav-disabled { opacity: .3; }

.course-continuity {
  max-width: 740px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 38px minmax(0, 1fr) 38px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 800;
}

.course-continuity__item {
  min-width: 0;
  padding: 10px 14px;
  overflow: hidden;
  color: rgba(29, 42, 54, .55);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-continuity__item[aria-current="step"] {
  background: var(--course-yellow);
  color: var(--course-ink);
}

.course-continuity__line {
  height: 2px;
  background: rgba(29, 42, 54, .22);
}

.course-hotspot {
  position: absolute;
  min-width: 96px;
  min-height: 96px;
  border: 4px solid var(--course-yellow);
  border-radius: 50%;
  background: rgba(23, 42, 58, .08);
  box-shadow: 0 0 0 8px rgba(246, 200, 79, .22);
  cursor: pointer;
}

.course-hotspot[aria-pressed="true"] {
  border-color: white;
  background: rgba(246, 200, 79, .38);
  box-shadow: 0 0 0 8px rgba(255, 255, 255, .24);
}

.course-choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.course-choice {
  min-height: 126px;
  padding: 18px 22px;
  border: 2px solid var(--course-navy);
  background: var(--course-paper-strong);
  color: var(--course-ink);
  cursor: pointer;
  text-align: left;
}

.course-choice[aria-pressed="true"] {
  background: var(--course-yellow);
  box-shadow: 8px 8px 0 rgba(38, 62, 85, .18);
}

.course-choice__letter {
  display: block;
  color: var(--course-rust-deep);
  font-size: 20px;
  font-weight: 900;
}

.course-choice__label {
  display: block;
  margin-top: 5px;
  font-size: 28px;
  font-weight: 900;
  line-height: 1.28;
}

.course-result,
.course-step {
  padding: 22px 26px;
  border: 2px solid var(--course-ink);
  background: var(--course-paper-strong);
}

.course-result[aria-live] { min-height: 150px; }

.course-reveal,
.course-physical-task,
.course-reset {
  min-height: 96px;
  padding: 18px 28px;
  border: 0;
  background: var(--course-navy);
  color: white;
  cursor: pointer;
  font-size: 25px;
  font-weight: 900;
  text-align: left;
}

.course-reveal:disabled { opacity: .34; cursor: default; }
.course-physical-task { background: var(--course-yellow); color: var(--course-ink); }
.course-physical-task[aria-pressed="true"] { background: var(--course-green); color: white; }
.course-reset { border: 2px solid var(--course-navy); background: transparent; color: var(--course-navy); }

.course-teacher-trigger {
  min-width: 154px;
  min-height: 96px;
  border: 2px solid var(--course-navy);
  background: transparent;
  color: var(--course-navy);
  cursor: pointer;
  font-size: 21px;
  font-weight: 900;
}

.course-teacher-trigger.is-holding,
.course-teacher-trigger:active { background: var(--course-navy); color: white; }

.course-teacher-panel {
  position: absolute;
  z-index: 60;
  top: 24px;
  right: 24px;
  width: 760px;
  max-height: 1032px;
  padding: 28px;
  overflow: auto;
  border: 3px solid var(--course-yellow);
  background: var(--course-navy-deep);
  color: white;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .44);
  transform: translateX(calc(100% + 60px));
  transition: transform .2s ease;
}

.course-teacher-panel.is-open { transform: translateX(0); }
.course-teacher-panel h2 { margin: 0; color: var(--course-yellow); font-size: 36px; }
.course-teacher-panel p,
.course-teacher-panel li { font-size: 20px; line-height: 1.55; }

.course-teacher-close {
  width: 100%;
  min-height: 96px;
  margin-top: 20px;
  border: 1px solid white;
  background: transparent;
  color: white;
  cursor: pointer;
  font-weight: 900;
}

.course-ability-field {
  display: grid;
  grid-template-columns: 190px 1fr;
  align-items: center;
  gap: 14px;
  margin-top: 14px;
}

.course-ability-field__label {
  color: white;
  font-size: 21px;
}

.course-ability-levels {
  display: grid;
  grid-template-columns: repeat(4, minmax(96px, 1fr));
  gap: 9px;
}

.course-ability-level {
  min-width: 96px;
  min-height: 96px;
  border: 1px solid rgba(255, 255, 255, .36);
  background: rgba(255, 255, 255, .08);
  color: white;
  cursor: pointer;
  font-size: 26px;
  font-weight: 900;
}

.course-ability-level[aria-pressed="true"] {
  border-color: var(--course-yellow);
  background: var(--course-yellow);
  color: var(--course-ink);
}

.course-empty-focus {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.course-canvas :focus-visible,
.course-nav :focus-visible {
  outline: 6px solid var(--course-rust);
  outline-offset: 5px;
}

@media (orientation: portrait) and (max-width: 1100px) {
  .course-orientation-note { display: block; }
}

@media (max-width: 720px) {
  .course-shell { grid-template-rows: minmax(0, 1fr) 68px; }
  .course-nav { grid-template-columns: 1fr 1fr; padding: 8px; }
  .course-nav__middle { display: none; }
  .course-nav__link,
  .course-nav__disabled { min-width: 0; min-height: 48px; }
  .course-toolbar { grid-template-columns: 1fr auto auto; }
  .course-toolbar .deck-label,
  .course-toolbar .nav-spacer { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .course-teacher-panel { transition: none; }
}

@media print {
  html,
  body,
  .course-shell,
  .course-viewport,
  .course-stage { width: 1920px !important; height: 1080px !important; overflow: visible; }
  .course-shell { display: block; }
  .course-stage { margin: 0 !important; }
  .course-canvas { position: static; transform: none !important; box-shadow: none; }
  .course-nav,
  .course-orientation-note,
  .course-teacher-trigger,
  .course-teacher-panel { display: none !important; }
}