:root {
  --ink: #1b2430;
  --ink-soft: #3d4a5c;
  --muted: #5c6b7a;
  --paper: #f4efe4;
  --paper-2: #fffdf8;
  --line: #d7cfc0;
  --teal: #0b6e6e;
  --teal-deep: #084f4f;
  --coral: #c45c3e;
  --gold: #d4a017;
  --sky: #2f4f73;
  --ok: #2d6a4f;
  --bad: #9b2226;
  --shadow: 0 10px 28px rgba(27, 36, 48, 0.08);
  --radius: 18px;
  --font: "Be Vietnam Pro", "Segoe UI", sans-serif;
  --display: "Fraunces", "Times New Roman", serif;
}

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

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

body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 0% 0%, rgba(11, 110, 110, 0.08), transparent 55%),
    radial-gradient(700px 380px at 100% 10%, rgba(196, 92, 62, 0.07), transparent 50%),
    var(--paper);
  line-height: 1.6;
}

.skip-link {
  position: absolute; left: 0.75rem; top: -3rem; z-index: 20;
  background: var(--ink); color: #fff; padding: 0.4rem 0.7rem; border-radius: 8px;
}
.skip-link:focus { top: 0.75rem; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); border: 0;
}

.app { display: grid; grid-template-columns: 268px 1fr; min-height: 100vh; }

.rail {
  position: sticky; top: 0; height: 100vh;
  padding: 1.4rem 1.15rem 1.2rem;
  background: linear-gradient(180deg, #12363a 0%, #0c2428 100%);
  color: #e8efe9; overflow: auto;
}
.rail-back { color: #b7d4ce; text-decoration: none; font-size: 0.82rem; font-weight: 600; }
.rail-back:hover { color: #fff; }
.rail-kicker {
  margin: 1.15rem 0 0.25rem; font-size: 0.72rem;
  letter-spacing: 0.08em; text-transform: uppercase; color: #8fb8b2;
}
.rail-title {
  margin: 0 0 1.1rem; font-family: var(--display);
  font-size: 1.55rem; font-weight: 700; line-height: 1.2;
}
.stations { list-style: none; margin: 0; padding: 0; }
.stations li + li { margin-top: 0.2rem; }
.stations button {
  width: 100%; text-align: left; border: 0; background: transparent;
  color: inherit; font: inherit; font-size: 0.86rem;
  padding: 0.42rem 0.5rem; border-radius: 10px; cursor: pointer;
  display: flex; gap: 0.5rem; align-items: baseline;
}
.stations button:hover, .stations button.is-current { background: rgba(255, 255, 255, 0.08); }
.stations .n { flex: 0 0 1.3rem; font-weight: 700; color: #e0b54a; }
.rail-score {
  margin-top: 1.4rem; padding: 0.75rem 0.8rem;
  border: 1px dashed rgba(255, 255, 255, 0.22); border-radius: 12px; font-size: 0.85rem;
}
.rail-score-label { display: block; color: #8fb8b2; margin-bottom: 0.15rem; }
.rail-score strong { font-size: 1.4rem; }

.stage { display: flex; flex-direction: column; min-width: 0; min-height: 100vh; }
.topbar { padding: 1rem 1.6rem 0; }
.progress-meta {
  display: flex; justify-content: space-between;
  font-size: 0.82rem; color: var(--muted); margin-bottom: 0.35rem;
}
.progress-track { height: 7px; background: #e4ddd0; border-radius: 99px; overflow: hidden; }
.progress-fill {
  height: 100%; width: 11%;
  background: linear-gradient(90deg, var(--teal), #3d9b8f);
  border-radius: inherit; transition: width 0.35s ease;
}

.screen-host { flex: 1; padding: 1.1rem 1.7rem 1.4rem; outline: none; }
.screen { display: none; animation: rise 0.35s ease; }
.screen.is-active { display: block; }
@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.eyebrow {
  margin: 0 0 0.25rem; font-size: 0.78rem; letter-spacing: 0.08em;
  text-transform: uppercase; font-weight: 700; color: var(--coral);
}
h2 {
  margin: 0 0 0.55rem; font-family: var(--display);
  font-size: clamp(1.55rem, 3vw, 2.15rem); line-height: 1.2; font-weight: 700;
}
h2 em { font-style: italic; color: var(--teal-deep); }
.lead { margin: 0 0 1.15rem; max-width: 62ch; color: var(--ink-soft); }
.subhead { margin: 1.5rem 0 0.5rem; font-size: 1.05rem; }

.btn {
  appearance: none; border: 0; border-radius: 999px;
  padding: 0.62rem 1.15rem; font: inherit; font-weight: 700; cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:focus-visible, .goal-card:focus-visible, .tab:focus-visible,
.flip:focus-visible, .carrier:focus-visible, .sort-chip:focus-visible,
.stations button:focus-visible, .choice:focus-within, .rain-table button:focus-visible {
  outline: 3px solid #e0b54a; outline-offset: 2px;
}
.btn-primary { background: var(--teal); color: #fff; box-shadow: 0 6px 16px rgba(11, 110, 110, 0.22); }
.btn-primary:hover { background: var(--teal-deep); }
.btn-secondary { background: #ead9c6; color: var(--ink); }
.btn-ghost { background: transparent; color: var(--sky); border: 1px solid var(--line); }

.nav-bar {
  display: flex; justify-content: space-between; gap: 0.75rem;
  padding: 0.7rem 1.6rem 1.1rem; border-top: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.7); backdrop-filter: blur(8px); position: sticky; bottom: 0;
}

.hero {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 1.6rem; align-items: center;
  background: var(--paper-2); border: 1px solid var(--line); border-radius: 28px;
  padding: 1.6rem 1.5rem; box-shadow: var(--shadow);
}
.badge {
  display: inline-block; margin: 0 0 0.7rem; padding: 0.2rem 0.65rem;
  border-radius: 999px; background: #e7f3f1; color: var(--teal-deep);
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.04em;
}
.hero-facts { margin: 0 0 1.1rem; padding-left: 1.15rem; color: var(--ink-soft); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.hero-visual { margin: 0; text-align: center; }
.hero-visual .flow-boxes { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; }
.flow-box {
  min-width: 88px; padding: 0.7rem 0.6rem; border-radius: 12px;
  border: 2px solid var(--teal); background: #eef6f4;
}
.flow-box.mid { border-color: var(--gold); background: #fff6e8; }
.flow-box.end { border-color: var(--coral); background: #fdece6; }
.flow-box strong { display: block; font-family: var(--display); font-size: 1.15rem; }
.flow-box span { font-size: 0.78rem; color: var(--muted); }
.hero-visual figcaption { font-size: 0.85rem; color: var(--muted); margin-top: 0.5rem; }

.goal-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.85rem; }
.goal-card {
  text-align: left; border: 1px solid var(--line); background: var(--paper-2);
  border-radius: var(--radius); padding: 1rem 1.05rem; cursor: pointer;
  font: inherit; color: inherit; box-shadow: var(--shadow);
}
.goal-icon {
  display: inline-grid; place-items: center; width: 1.8rem; height: 1.8rem;
  border-radius: 50%; background: #12363a; color: #f4efe4;
  font-weight: 800; font-size: 0.85rem; margin-bottom: 0.45rem;
}
.goal-title { display: block; font-weight: 700; }
.goal-body { display: none; margin-top: 0.45rem; color: var(--ink-soft); font-size: 0.94rem; }
.goal-card.is-open .goal-body, .goal-card[aria-expanded="true"] .goal-body { display: block; }

.note-card, .insight, .task-panel, .open-box, .teacher-box {
  margin-top: 1.15rem; padding: 0.95rem 1.05rem; border-radius: 16px;
  background: #fff8ea; border: 1px dashed #d8b56a;
}
.insight { background: #e7f3f1; border-color: #7fb3ad; }

.tabs { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 0.9rem; }
.tab {
  border: 1px solid var(--line); background: var(--paper-2); border-radius: 999px;
  padding: 0.4rem 0.85rem; font: inherit; font-weight: 600; cursor: pointer; color: var(--ink-soft);
}
.tab.is-active { background: var(--teal); border-color: var(--teal); color: #fff; }

.situation {
  display: grid; grid-template-columns: 180px 1fr; gap: 1rem;
  background: var(--paper-2); border: 1px solid var(--line); border-radius: 20px; padding: 1rem;
}
.situation-visual {
  display: grid; place-items: center; min-height: 160px; border-radius: 16px; background: #eef4f1;
  text-align: center; padding: 0.6rem;
}
.icon-visual { font-size: 2.8rem; line-height: 1.2; }
.icon-caption { margin: 0.4rem 0 0; font-weight: 700; font-size: 0.92rem; }
.situation-body h3 { margin: 0 0 0.3rem; }
.situation-body label, .apply-form label, .open-box label, .own-q {
  display: block; margin: 0.65rem 0; font-weight: 600; font-size: 0.92rem;
}
textarea, input[type="text"] {
  display: block; width: 100%; margin-top: 0.3rem; font: inherit;
  padding: 0.55rem 0.7rem; border-radius: 12px; border: 1px solid #cfc6b6; background: #fff; resize: vertical;
}
.reveal { margin-top: 0.7rem; padding: 0.7rem 0.8rem; border-radius: 12px; background: #e7f3f1; }
.reveal p { margin: 0.25rem 0; }

.flip-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.8rem; perspective: 900px; }
.flip-row.cols-4 { grid-template-columns: repeat(4, 1fr); }
.flip { min-height: 168px; padding: 0; border: 0; background: transparent; cursor: pointer; font: inherit; color: inherit; }
.flip-inner { display: block; height: 168px; transform-style: preserve-3d; transition: transform 0.45s ease; position: relative; }
.flip.is-flipped .flip-inner, .flip[aria-pressed="true"] .flip-inner { transform: rotateY(180deg); }
.flip-face {
  position: absolute; inset: 0; backface-visibility: hidden; border-radius: 16px;
  padding: 1rem; display: flex; flex-direction: column; justify-content: center;
  border: 1px solid var(--line); box-shadow: var(--shadow);
}
.flip-front { background: var(--paper-2); }
.flip-back { background: #12363a; color: #f3f7f5; transform: rotateY(180deg); font-size: 0.95rem; }
.flip-kicker { font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.flip-word { font-family: var(--display); font-size: 1.35rem; font-weight: 700; }
.flip-hint { margin-top: 0.4rem; font-size: 0.8rem; color: var(--muted); }

.pipeline { display: flex; align-items: center; gap: 0.8rem; margin: 1.3rem 0 0.4rem; flex-wrap: wrap; }
.pipe-node { flex: 1 1 180px; background: var(--paper-2); border: 1px solid var(--line); border-radius: 16px; padding: 0.85rem 1rem; }
.pipe-node-info { background: #fdece6; border-color: #e8b3a3; }
.pipe-label { display: block; font-weight: 800; }
.pipe-arrow { font-weight: 700; color: var(--teal); }

.carrier-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 0.55rem; }
.carrier { border: 1px solid var(--line); background: var(--paper-2); border-radius: 14px; padding: 0.7rem 0.4rem; font: inherit; cursor: pointer; }
.carrier.is-on { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(11, 110, 110, 0.15); }
.carrier-emoji { display: block; font-size: 1.5rem; margin-bottom: 0.2rem; }
.carrier-detail {
  margin-top: 0.75rem; padding: 0.8rem 0.9rem; border-radius: 14px;
  background: var(--paper-2); border: 1px solid var(--line);
}

.sort-bank { display: flex; flex-wrap: wrap; gap: 0.45rem; min-height: 3rem; margin-bottom: 0.85rem; }
.sort-chip {
  border: 1px solid #c9bba4; background: #fff; border-radius: 999px;
  padding: 0.38rem 0.75rem; font: inherit; font-size: 0.9rem; cursor: pointer;
}
.sort-chip.is-held { background: #12363a; color: #fff; border-color: #12363a; }
.sort-chip.is-ok { background: #d8f3dc; border-color: #2d6a4f; }
.sort-chip.is-bad { background: #fde2e1; border-color: #9b2226; }
.sort-bins { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.7rem; }
.sort-bins.cols-2 { grid-template-columns: 1fr 1fr; }
.sort-bins.cols-4 { grid-template-columns: repeat(4, 1fr); }
.bin { background: var(--paper-2); border: 1px dashed #b7c4bc; border-radius: 16px; padding: 0.7rem; min-height: 170px; }
.bin.is-target { border-color: var(--teal); background: #eef7f5; }
.bin h3 { margin: 0; font-size: 1rem; }
.bin-hint { margin: 0.15rem 0 0.5rem; font-size: 0.78rem; color: var(--muted); }
.bin-drop { display: flex; flex-direction: column; gap: 0.35rem; min-height: 4.5rem; }

.row-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.65rem; margin-top: 0.9rem; }
.inline-feedback { margin: 0; font-weight: 600; }
.inline-feedback.is-ok { color: var(--ok); }
.inline-feedback.is-bad { color: var(--bad); }

.story-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
.story { background: var(--paper-2); border-radius: 16px; padding: 0.85rem 1rem; border-left: 5px solid var(--gold); }
.story h3 { margin: 0 0 0.3rem; }
.story p { margin: 0; color: var(--ink-soft); }

.question-picks { border: 0; padding: 0; margin: 0.6rem 0; display: grid; gap: 0.4rem; }
.question-picks label {
  display: flex; gap: 0.55rem; align-items: flex-start;
  background: #fff; border: 1px solid var(--line); border-radius: 12px;
  padding: 0.55rem 0.7rem; font-weight: 500;
}
.question-picks label.is-good { background: #d8f3dc; border-color: #2d6a4f; }
.question-picks label.is-weak { background: #fde2e1; border-color: #e0b4b4; }

.quiz { margin: 0; padding-left: 1.2rem; }
.quiz > li { margin: 0 0 0.95rem; }
.quiz fieldset { border: 0; margin: 0.35rem 0 0; padding: 0; display: grid; gap: 0.3rem; }
.quiz label {
  display: flex; gap: 0.5rem; align-items: flex-start;
  background: var(--paper-2); border: 1px solid var(--line); border-radius: 10px; padding: 0.45rem 0.6rem;
}
.quiz label.is-right { background: #d8f3dc; border-color: #2d6a4f; }
.quiz label.is-wrong { background: #fde2e1; border-color: #9b2226; }

.table-wrap { overflow-x: auto; margin: 0.6rem 0; }
.rain-table { width: 100%; border-collapse: collapse; background: var(--paper-2); }
.rain-table caption { text-align: left; font-weight: 700; padding-bottom: 0.4rem; }
.rain-table th, .rain-table td { border: 1px solid #d2c8b6; padding: 0.45rem; text-align: center; }
.rain-table button {
  border: 0; background: transparent; font: inherit; font-weight: 700;
  cursor: pointer; color: var(--teal-deep); width: 100%;
}
.rain-table .is-hi { background: #fff3c4; }
.table-note { color: var(--muted); font-size: 0.92rem; }

.choice-row { display: grid; gap: 0.5rem; margin-bottom: 0.9rem; }
.choice {
  display: flex; gap: 0.6rem; align-items: flex-start;
  background: var(--paper-2); border: 1px solid var(--line); border-radius: 14px; padding: 0.7rem 0.8rem;
}
.choice:has(input:checked) { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(11, 110, 110, 0.12); }
.apply-form { background: var(--paper-2); border: 1px solid var(--line); border-radius: 18px; padding: 1rem; }
.form-hint { color: var(--muted); font-size: 0.88rem; }
.takeaways { padding-left: 1.2rem; }
.takeaways li { margin-bottom: 0.45rem; }
.scoreboard { margin: 1rem 0; padding: 1rem; border-radius: 16px; background: #12363a; color: #eef5f3; }
.scoreboard strong { font-family: var(--display); font-size: 1.8rem; }
.checklist { display: grid; gap: 0.4rem; }
.checklist label { display: flex; gap: 0.5rem; align-items: flex-start; }
.teacher-toggle {
  border: 0; background: transparent; font: inherit; font-weight: 700;
  color: var(--sky); cursor: pointer; padding: 0; text-align: left;
}
.teacher-body { margin-top: 0.6rem; }
.teacher-body ul { margin: 0.3rem 0; padding-left: 1.15rem; }

@media (max-width: 960px) {
  .app { grid-template-columns: 1fr; }
  .rail { position: relative; height: auto; padding-bottom: 0.8rem; }
  .stations { display: flex; gap: 0.25rem; overflow: auto; }
  .stations li { flex: 0 0 auto; }
  .stations button { width: auto; white-space: nowrap; }
  .rail-score { display: none; }
  .hero, .situation, .goal-grid, .flip-row, .flip-row.cols-4,
  .sort-bins, .sort-bins.cols-4, .story-grid { grid-template-columns: 1fr; }
  .carrier-grid { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

@media print {
  .rail, .nav-bar, .topbar, .skip-link { display: none !important; }
  .app, .stage, .screen-host { display: block; }
  .screen { display: block !important; break-inside: avoid; margin-bottom: 1.2rem; }
}