:root {
  --future-bg: #f8fafc;
  --future-card: #ffffff;
  --future-text: #172033;
  --future-muted: #64748b;
  --future-border: #dbe5e7;
  --future-accent: #0f766e;
  --future-accent-dark: #115e59;
  --future-soft: #ecfdf5;
  --future-warm: #fff7ed;
  --future-good: #15803d;
  --future-bad: #b91c1c;
}

.future-fill-page {
  margin: 0;
  min-height: 100vh;
  color: var(--future-text);
  background: linear-gradient(180deg, #f0fdfa 0, #f8fafc 300px, #f8fafc 100%);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.future-fill-main { width: min(920px, calc(100% - 28px)); margin: 0 auto; padding: 44px 0 64px; }
.future-fill-hero { text-align: center; margin-bottom: 26px; }
.hero-kicker { display: inline-block; padding: 7px 12px; border-radius: 999px; background: #ccfbf1; color: #115e59; font-size: .78rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.future-fill-hero h1 { margin: 14px 0 10px; font-size: clamp(2rem, 5vw, 3.25rem); line-height: 1.05; letter-spacing: -.03em; }
.hero-subtitle { margin: 0 auto 8px; max-width: 720px; font-size: 1.1rem; color: #334155; }
.hero-copy { margin: 0 auto; max-width: 760px; color: var(--future-muted); line-height: 1.7; }

.quiz-shell { background: var(--future-card); border: 1px solid var(--future-border); border-radius: 20px; box-shadow: 0 10px 30px rgba(15, 23, 42, .07); overflow: hidden; }
#start-screen, #quiz-screen, .result-screen { padding: clamp(22px, 5vw, 42px); }
.hidden { display: none !important; }

.setup-heading { text-align: center; margin-bottom: 16px; }
.setup-eyebrow { margin: 0 0 5px; color: var(--future-accent); font-size: .76rem; font-weight: 900; text-transform: uppercase; letter-spacing: .09em; }
.setup-heading h2 { margin: 0; font-size: clamp(1.25rem, 3vw, 1.65rem); line-height: 1.25; }
.setup-heading em { color: var(--future-accent-dark); font-style: normal; }

.rules-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 18px 0 22px; }
.rules-strip > div { display: grid; grid-template-columns: auto 1fr; gap: 9px; align-items: center; min-height: 68px; padding: 12px; border: 1px solid var(--future-border); border-radius: 14px; background: #f8fafc; }
.rules-strip strong { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; background: var(--future-soft); color: var(--future-accent-dark); font-size: .82rem; }
.rules-strip span { color: #475569; font-size: .82rem; line-height: 1.4; }

.example-card { margin: 22px auto; max-width: 430px; padding: 20px; border-radius: 18px; background: var(--future-warm); border: 1px solid #fed7aa; text-align: center; display: grid; gap: 3px; }
.example-label { margin: 0 0 5px; font-size: .72rem; font-weight: 800; color: #c2410c; text-transform: uppercase; letter-spacing: .1em; }
.example-card strong { font-size: 1.45rem; }
.example-card small { color: var(--future-muted); font-size: .82rem; }
.example-arrow { margin: 4px 0; color: #ea580c; }
.example-card .answer-example { color: var(--future-accent-dark); }

.length-picker { border: 0; padding: 0; margin: 24px 0 18px; }
.length-picker legend { width: 100%; margin-bottom: 12px; text-align: center; font-weight: 800; }
.length-picker { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.length-picker legend { grid-column: 1 / -1; }
.length-option { cursor: pointer; position: relative; }
.length-option input { position: absolute; opacity: 0; pointer-events: none; }
.length-option span { display: block; padding: 14px 9px; border: 2px solid var(--future-border); border-radius: 14px; background: #fff; text-align: center; transition: .18s ease; }
.length-option strong { display: block; font-size: 1.35rem; color: var(--future-accent); }
.length-option small { display: block; margin-top: 3px; color: var(--future-muted); font-size: .75rem; }
.length-option:hover span { transform: translateY(-1px); border-color: #99f6e4; }
.length-option.selected span, .length-option:has(input:checked) span { border-color: var(--future-accent); background: var(--future-soft); box-shadow: 0 0 0 3px rgba(15,118,110,.08); }

.primary-action, .secondary-action { min-height: 46px; border-radius: 12px; padding: 11px 18px; border: 0; font: inherit; font-weight: 800; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; }
.primary-action { background: var(--future-accent); color: white; }
.primary-action:hover { background: var(--future-accent-dark); }
.secondary-action { background: white; color: var(--future-accent-dark); border: 1px solid #99f6e4; }
.secondary-action:hover { background: var(--future-soft); }
#start-quiz-btn { width: 100%; }

.quiz-topbar { margin-bottom: 20px; }
.meta-row { display: flex; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
.meta-chip { font-size: .82rem; font-weight: 800; color: #475569; }
.score-chip { color: var(--future-accent-dark); }
.progress-track { height: 9px; border-radius: 999px; overflow: hidden; background: #e2e8f0; }
.progress-bar { height: 100%; width: 0; background: linear-gradient(90deg, #14b8a6, #0f766e); transition: width .25s ease; }

.question-panel { text-align: center; }
.question-instruction { margin: 0 0 13px; color: var(--future-accent-dark); font-size: .76rem; font-weight: 900; text-transform: uppercase; letter-spacing: .08em; }
.prompt-card { padding: 24px 18px; background: #f8fafc; border: 1px solid var(--future-border); border-radius: 18px; }
.question-spanish { margin: 0; font-size: clamp(1.9rem, 6vw, 2.8rem); font-weight: 850; letter-spacing: -.02em; }
.question-english { margin: 7px 0 0; color: var(--future-muted); font-size: .88rem; }
.target-card { margin-top: 18px; padding: 18px 14px; border: 1px solid #c7d2fe; border-radius: 16px; background: #eef2ff; }
.answer-label { display: block; margin: 0 0 10px; font-size: .76rem; font-weight: 850; color: #4338ca; text-transform: uppercase; letter-spacing: .06em; }
.answer-builder { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 5px; color: var(--future-text); font-size: clamp(1.35rem, 4.7vw, 2rem); font-weight: 800; line-height: 1.55; }
.answer-context { white-space: pre-wrap; }
.answer-input { width: min(180px, 48vw); box-sizing: border-box; padding: 7px 10px; border: 0; border-bottom: 3px solid #6366f1; border-radius: 8px 8px 3px 3px; background: #fff; color: var(--future-text); font: inherit; font-size: 1.05em; font-weight: 850; text-align: center; outline: none; }
.answer-input:focus { border-bottom-color: var(--future-accent); box-shadow: 0 0 0 4px rgba(15,118,110,.10); }
.answer-input[disabled] { background: #f8fafc; color: #475569; }

.spanish-keyboard { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 7px; margin-top: 13px; }
.spanish-keyboard > span { margin-right: 2px; color: var(--future-muted); font-size: .76rem; font-weight: 700; }
.char-key { min-width: 36px; min-height: 34px; border: 1px solid #cbd5e1; border-radius: 9px; background: #fff; color: #334155; font: inherit; font-weight: 800; cursor: pointer; }
.char-key:hover { border-color: var(--future-accent); background: var(--future-soft); }

.accent-note, .feedback { width: min(560px, 100%); margin: 15px auto 0; box-sizing: border-box; padding: 12px 14px; border-radius: 12px; line-height: 1.5; }
.accent-note { background: #fffbeb; border: 1px solid #fde68a; color: #92400e; }
.feedback { border: 1px solid; }
.feedback.correct { background: #f0fdf4; border-color: #bbf7d0; color: #166534; }
.feedback.wrong { background: #fef2f2; border-color: #fecaca; color: #991b1b; }
.feedback .feedback-answer { display: block; margin-top: 5px; font-size: 1.45rem; font-weight: 900; color: var(--future-text); }
.feedback .feedback-english { display: block; margin-top: 1px; font-size: .82rem; color: #64748b; }
.question-actions { margin-top: 18px; display: flex; justify-content: center; gap: 10px; }

.result-screen { text-align: center; }
.result-icon { width: 58px; height: 58px; margin: 0 auto 10px; border-radius: 50%; display: grid; place-items: center; background: var(--future-soft); color: var(--future-good); font-size: 1.7rem; font-weight: 900; }
.result-label { margin: 0; color: var(--future-muted); font-size: .8rem; text-transform: uppercase; font-weight: 800; letter-spacing: .08em; }
.result-score { margin: 6px 0; font-size: clamp(2.5rem, 8vw, 4.2rem); font-weight: 900; color: var(--future-accent-dark); }
.result-screen h2 { margin: 3px 0 7px; }
#result-summary { margin: 0 auto; max-width: 620px; color: var(--future-muted); }
.result-stats { margin: 22px auto; max-width: 600px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.result-stats > div { padding: 14px 10px; border-radius: 14px; background: #f8fafc; border: 1px solid var(--future-border); }
.result-stats strong, .result-stats span { display: block; }
.result-stats strong { font-size: 1.45rem; }
.result-stats span { margin-top: 2px; color: var(--future-muted); font-size: .75rem; }

.review-section { margin: 24px auto; max-width: 680px; text-align: left; }
.review-section h3 { text-align: center; }
.review-item { padding: 13px 14px; margin-top: 9px; border: 1px solid var(--future-border); border-radius: 12px; background: #f8fafc; }
.review-item strong, .review-item small { display: block; }
.review-item .review-answer { margin-top: 4px; color: var(--future-good); font-weight: 850; }
.review-item small { color: var(--future-muted); margin-top: 2px; }

.leaderboard-panel { margin: 26px auto 0; max-width: 650px; padding: 20px; border: 1px solid var(--future-border); border-radius: 18px; background: #f8fafc; text-align: left; }
.leaderboard-panel h3 { margin: 0 0 4px; text-align: center; }
.leaderboard-copy { margin: 0 0 14px; color: var(--future-muted); text-align: center; font-size: .85rem; }
.save-row { display: grid; grid-template-columns: 1fr auto; gap: 9px; }
.save-row input { min-width: 0; padding: 11px 12px; border: 1px solid #cbd5e1; border-radius: 10px; font: inherit; }
.save-message { margin: 9px 0 0; font-size: .82rem; font-weight: 700; }
#leaderboard-list { margin: 16px 0 0; padding-left: 26px; }
#leaderboard-list li { padding: 5px 0; color: #475569; }
.result-actions { margin-top: 20px; display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }

.study-section { margin-top: 34px; }
.study-section h2 { text-align: center; }
.study-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.study-grid article { padding: 17px; border: 1px solid var(--future-border); border-radius: 15px; background: #fff; }
.study-grid strong, .study-grid span { display: block; }
.study-grid span { margin-top: 5px; color: var(--future-muted); line-height: 1.55; font-size: .9rem; }
.related-links { margin-top: 16px; display: flex; flex-wrap: wrap; justify-content: center; gap: 9px; }
.related-links a { padding: 9px 12px; border-radius: 999px; background: #fff; border: 1px solid var(--future-border); color: var(--future-accent-dark); font-size: .85rem; font-weight: 750; text-decoration: none; }
.related-links a:hover { background: var(--future-soft); }

@media (max-width: 700px) {
  .future-fill-main { padding-top: 28px; }
  .rules-strip, .study-grid { grid-template-columns: 1fr; }
  .result-stats { grid-template-columns: 1fr; }
  .save-row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .length-picker { grid-template-columns: 1fr; }
  .length-picker legend { grid-column: auto; }
  #start-screen, #quiz-screen, .result-screen { padding: 20px 15px; }
  .question-actions { flex-direction: column; }
  .question-actions .primary-action { width: 100%; }
}

@media (max-width: 480px) {
  .answer-builder { font-size: 1.28rem; gap: 3px; }
  .answer-input { width: min(155px, 52vw); }
}