:root {
  --bg-0: #0a0a0c;
  --bg-1: #141417;
  --bg-2: #1c1c20;
  --ink: #ffffff;
  --ink-soft: rgba(255, 255, 255, 0.7);
  --ink-faint: rgba(255, 255, 255, 0.45);
  --accent: #fa5400;
  --p1: #38bdf8;
  --p2: #fa5400;
  --right: #34d399;
  --wrong: #f87171;
  --card: #16161a;
  --card-line: rgba(255, 255, 255, 0.08);
  --radius: 18px;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  font-family: 'Quicksand', 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(180deg, var(--bg-0) 0%, var(--bg-1) 60%, var(--bg-2) 100%);
  background-attachment: fixed;
  color: var(--ink);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ------ Screens ------ */
.screen { display: none; padding: 40px 24px 60px; max-width: 980px; margin: 0 auto; }
.screen--active { display: block; }

/* ------ Setup ------ */
.hero { text-align: center; position: relative; margin-bottom: 28px; }
.back-link {
  position: absolute; top: 6px; left: 6px; font-size: 0.92rem;
  color: var(--ink-faint);
}
.back-link:hover { color: var(--accent); text-decoration: none; }
h1 {
  font-family: 'Helvetica Neue', 'Arial Black', system-ui, sans-serif;
  font-style: italic;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.015em;
  font-size: clamp(2.6rem, 7vw, 4.2rem);
  margin: 14px 0 10px;
}
.tagline {
  color: var(--ink-soft); font-size: 1.05rem; max-width: 560px; margin: 0 auto;
  line-height: 1.5;
}

.setup-card {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: var(--shadow);
  margin-top: 16px;
}

.players {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 14px;
  align-items: end;
  margin-bottom: 28px;
}
.players label { display: flex; flex-direction: column; gap: 6px; }
.lbl {
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--ink-faint); font-weight: 700;
}
.players input {
  background: var(--bg-1);
  border: 1px solid var(--card-line);
  color: var(--ink);
  border-radius: 10px;
  padding: 14px 14px;
  font-size: 1.1rem;
  font-weight: 700;
  font-family: inherit;
}
.players input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.vs {
  font-weight: 900; font-style: italic; opacity: 0.5; padding-bottom: 14px;
  font-size: 1.1rem;
}
#name1:focus, #p1-card .score-name { color: var(--p1); }
#name2:focus, #p2-card .score-name { color: var(--p2); }

.mode-picker {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-bottom: 22px;
}
.mode {
  background: var(--bg-1);
  border: 1px solid var(--card-line);
  color: var(--ink);
  border-radius: 14px;
  padding: 18px 16px;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  display: flex; flex-direction: column; gap: 4px;
  transition: border-color 0.15s, background 0.15s;
}
.mode:hover { border-color: rgba(255, 255, 255, 0.25); }
.mode--active {
  border-color: var(--accent);
  background: rgba(250, 84, 0, 0.08);
}
.mode__title { font-weight: 800; font-size: 1.15rem; }
.mode__sub { color: var(--ink-faint); font-size: 0.9rem; }

.options {
  display: flex; gap: 10px; align-items: center; margin-bottom: 24px;
  flex-wrap: wrap;
}
.opt-label { color: var(--ink-faint); font-size: 0.92rem; }
.target {
  background: var(--bg-1);
  border: 1px solid var(--card-line);
  color: var(--ink);
  border-radius: 999px;
  padding: 8px 18px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.95rem;
}
.target--active { background: rgba(250, 84, 0, 0.15); border-color: var(--accent); color: var(--accent); }

.setsize {
  background: var(--bg-1);
  border: 1px solid var(--card-line);
  color: var(--ink);
  border-radius: 999px;
  padding: 8px 18px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.95rem;
}
.setsize--active { background: rgba(250, 84, 0, 0.15); border-color: var(--accent); color: var(--accent); }

.setup-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  border: none; cursor: pointer; font-family: inherit; font-weight: 700;
  padding: 14px 22px; border-radius: 999px; font-size: 1rem;
  transition: transform 0.1s, background 0.15s;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--accent); color: white;
}
.btn--primary:hover { background: #ff6a1f; }
.btn--ghost {
  background: transparent; color: var(--ink-soft);
  border: 1px solid var(--card-line);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn--sm { padding: 8px 14px; font-size: 0.88rem; }

.word-count {
  color: var(--ink-faint); font-size: 0.85rem; margin: 16px 0 0;
}

/* ------ Learn (flashcards) ------ */
.learn-bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 14px; margin-bottom: 20px;
}
.learn-progress { flex: 1; display: flex; flex-direction: column; gap: 6px; align-items: center; }
.learn-progress__track {
  width: 100%; max-width: 360px; height: 8px;
  background: var(--bg-1); border: 1px solid var(--card-line);
  border-radius: 999px; overflow: hidden;
}
.learn-progress__fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--accent), #ffb347);
  border-radius: 999px; transition: width 0.3s ease;
}
.learn-progress__label { font-size: 0.82rem; color: var(--ink-faint); font-weight: 700; }

.flashcard {
  perspective: 1200px;
  cursor: pointer;
  margin: 0 auto 22px;
  max-width: 680px;
}
.flashcard__inner {
  position: relative;
  width: 100%; min-height: 260px;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.3, 0.8, 0.4, 1);
}
.flashcard.flipped .flashcard__inner { transform: rotateY(180deg); }
.flashcard__face {
  position: absolute; inset: 0;
  -webkit-backface-visibility: hidden; backface-visibility: hidden;
  background: var(--card); border: 1px solid var(--card-line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 36px 28px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 14px; text-align: center;
}
.flashcard__back { transform: rotateY(180deg); }
.flashcard__label {
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.16em;
  color: var(--ink-faint); font-weight: 800;
}
.flashcard__text {
  font-family: 'Helvetica Neue', system-ui, sans-serif;
  font-weight: 900; font-style: italic;
  font-size: clamp(2rem, 6vw, 3.2rem); line-height: 1.05;
  letter-spacing: -0.01em;
}
.flashcard__text--def {
  font-style: normal; font-weight: 700;
  font-size: clamp(1.3rem, 4vw, 1.9rem); line-height: 1.35;
}
.flashcard__back .flashcard__label { color: var(--accent); }
.flashcard__sentence {
  margin-top: 14px;
  padding: 0 18px;
  font-size: clamp(0.92rem, 2.4vw, 1.05rem);
  font-style: italic;
  font-weight: 500;
  color: var(--ink-soft, rgba(0,0,0,0.55));
  line-height: 1.45;
  max-width: 90%;
}
.flashcard__hint {
  position: absolute; bottom: 16px; left: 0; right: 0;
  font-size: 0.8rem; color: var(--ink-faint); font-weight: 600;
}

.learn-rating {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  max-width: 680px; margin: 0 auto;
  opacity: 0.35; pointer-events: none; transition: opacity 0.2s;
}
.flashcard.flipped ~ .learn-rating { opacity: 1; pointer-events: auto; }
.rate { color: #fff; }
.rate--learning { background: var(--accent); }
.rate--learning:hover { background: #ff6a1f; }
.rate--known { background: var(--right); }
.rate--known:hover { background: #2bbd86; }
.learn-tip {
  text-align: center; color: var(--ink-faint); font-size: 0.85rem;
  max-width: 560px; margin: 16px auto 0; line-height: 1.5; min-height: 1em;
}
.learn-test-cta { text-align: center; margin-top: 18px; }

/* ------ Set picker ------ */
.sets-head { flex: 1; text-align: center; }
.sets-title {
  margin: 0; font-weight: 900; font-style: italic; text-transform: uppercase;
  font-size: 1.4rem; letter-spacing: -0.01em;
}
.sets-sub { margin: 2px 0 0; color: var(--ink-faint); font-size: 0.85rem; }
.set-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px; max-width: 760px; margin: 8px auto 0;
}
.set-tile {
  background: var(--card); border: 1px solid var(--card-line);
  border-radius: 14px; padding: 16px 14px; cursor: pointer;
  font-family: inherit; color: var(--ink); text-align: left;
  display: flex; flex-direction: column; gap: 4px;
  transition: border-color 0.15s, transform 0.05s;
}
.set-tile:hover { border-color: rgba(255, 255, 255, 0.25); }
.set-tile:active { transform: scale(0.99); }
.set-tile__name { font-weight: 800; font-size: 1.05rem; }
.set-tile__range { color: var(--ink-faint); font-size: 0.8rem; }
.set-tile__status { font-size: 0.82rem; font-weight: 700; margin-top: 4px; min-height: 1em; }
.set-tile--passed { border-color: rgba(52, 211, 153, 0.5); }
.set-tile--passed .set-tile__status { color: var(--right); }
.set-tile--current { border-color: var(--accent); box-shadow: 0 0 0 1px rgba(250, 84, 0, 0.4); }
.set-tile--current .set-tile__status { color: var(--accent); }

/* ------ Test score chip ------ */
.test-score { font-size: 0.95rem; color: var(--ink-soft); white-space: nowrap; }
.test-score span { color: var(--ink); font-weight: 800; font-size: 1.3rem; }

/* ------ Learn confetti ------ */
#screen-learn-done { position: relative; }
#learn-confetti { position: fixed; inset: 0; pointer-events: none; z-index: 5; }

.recent {
  margin-top: 32px;
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: var(--radius);
  padding: 20px 24px;
}
.recent h3 {
  margin: 0 0 12px;
  color: var(--ink-faint); font-size: 0.85rem; letter-spacing: 0.12em;
  text-transform: uppercase;
}
.recent ul { list-style: none; padding: 0; margin: 0; }
.recent li {
  padding: 8px 0;
  border-top: 1px solid var(--card-line);
  display: flex; justify-content: space-between; gap: 12px;
  font-size: 0.95rem;
}
.recent li:first-child { border-top: 0; }
.recent .who { font-weight: 700; }
.recent .when { color: var(--ink-faint); font-size: 0.82rem; }

/* ------ Duel ------ */
.duel-scoreboard {
  display: grid; grid-template-columns: 1fr auto 1fr;
  gap: 14px; align-items: center;
  margin-bottom: 18px;
}
.score-card {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: 14px;
  padding: 14px 18px;
  text-align: center;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.score-card.active { box-shadow: 0 0 0 2px var(--accent); }
#p1-card.active { box-shadow: 0 0 0 2px var(--p1); }
#p2-card.active { box-shadow: 0 0 0 2px var(--p2); }
.score-name {
  font-weight: 800; font-size: 1rem; letter-spacing: 0.04em;
  text-transform: uppercase;
}
.score-num {
  font-family: 'Helvetica Neue', system-ui, sans-serif;
  font-weight: 900; font-style: italic;
  font-size: clamp(2.4rem, 7vw, 3.6rem);
  line-height: 1;
  margin: 4px 0;
}
.score-streak {
  font-size: 0.82rem; color: var(--ink-faint); min-height: 1em;
}
.target-mid {
  color: var(--ink-faint); font-size: 0.85rem;
  text-transform: uppercase; letter-spacing: 0.1em;
  text-align: center;
  padding: 0 6px;
}

.turn-banner {
  text-align: center; font-weight: 800; font-size: 1.1rem;
  padding: 10px 14px; margin-bottom: 18px;
  background: var(--card); border: 1px solid var(--card-line);
  border-radius: 999px;
}

/* ------ Clock ------ */
.clock-head {
  display: grid; grid-template-columns: 1fr auto 1fr;
  align-items: center; gap: 14px;
  background: var(--card); border: 1px solid var(--card-line);
  border-radius: 14px; padding: 14px 22px; margin-bottom: 18px;
}
.clock-player { font-weight: 800; font-size: 1.1rem; }
.clock-timer {
  font-family: 'Helvetica Neue', system-ui, sans-serif;
  font-weight: 900; font-style: italic; font-size: 2.4rem;
  letter-spacing: -0.02em;
}
.clock-timer.low { color: var(--wrong); animation: pulse 0.6s infinite alternate; }
@keyframes pulse {
  from { transform: scale(1); }
  to   { transform: scale(1.08); }
}
.clock-score { text-align: right; font-size: 1rem; color: var(--ink-soft); }
.clock-score span { color: var(--ink); font-weight: 800; font-size: 1.4rem; }

/* ------ Shared word stage ------ */
.word-stage {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: var(--radius);
  padding: 32px 28px;
  margin-bottom: 18px;
  box-shadow: var(--shadow);
}
.word-prompt {
  text-align: center;
  font-family: 'Helvetica Neue', system-ui, sans-serif;
  font-weight: 900; font-style: italic;
  font-size: clamp(2rem, 6vw, 3.2rem);
  letter-spacing: -0.01em;
  margin-bottom: 24px;
}
.answers { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 560px) { .answers { grid-template-columns: 1fr; } }
.answer {
  text-align: left;
  background: var(--bg-1);
  border: 1px solid var(--card-line);
  color: var(--ink);
  border-radius: 12px;
  padding: 14px 16px;
  font-family: inherit;
  font-size: 0.98rem;
  line-height: 1.4;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, transform 0.05s;
}
.answer:hover:not(:disabled) { border-color: rgba(255, 255, 255, 0.25); background: rgba(255, 255, 255, 0.03); }
.answer:active { transform: scale(0.99); }
.answer:disabled { cursor: default; opacity: 0.85; }
.answer.right { border-color: var(--right); background: rgba(52, 211, 153, 0.12); }
.answer.wrong { border-color: var(--wrong); background: rgba(248, 113, 113, 0.12); }

.feedback {
  min-height: 1.2em; margin-top: 14px;
  text-align: center; font-weight: 700; font-size: 1rem;
}
.feedback.good { color: var(--right); }
.feedback.bad  { color: var(--wrong); }

.duel-actions { text-align: center; }

/* ------ Handoff ------ */
.handoff-card {
  max-width: 520px; margin: 80px auto 0;
  background: var(--card); border: 1px solid var(--card-line);
  border-radius: var(--radius); padding: 36px 28px;
  text-align: center; box-shadow: var(--shadow);
}
.handoff-eyebrow {
  color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.12em;
  font-size: 0.8rem; font-weight: 700; margin-bottom: 8px;
}
.handoff-card h2 { margin: 0 0 14px; font-size: 1.8rem; font-weight: 900; font-style: italic; text-transform: uppercase; }
.handoff-detail { color: var(--ink-soft); font-size: 1.05rem; margin-bottom: 24px; line-height: 1.5; }

/* ------ Result ------ */
#screen-result { position: relative; }
#confetti {
  position: fixed; inset: 0; pointer-events: none; z-index: 5;
}
.result-card {
  max-width: 560px; margin: 60px auto 0;
  background: var(--card); border: 1px solid var(--card-line);
  border-radius: var(--radius); padding: 36px 28px;
  text-align: center; box-shadow: var(--shadow);
  position: relative; z-index: 10;
}
.result-eyebrow {
  color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.12em;
  font-size: 0.8rem; font-weight: 700; margin-bottom: 8px;
}
#result-headline {
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  font-weight: 900; font-style: italic; text-transform: uppercase;
  margin: 0 0 16px;
}
.result-scores {
  display: flex; justify-content: center; gap: 30px; margin: 18px 0;
}
.result-score { text-align: center; }
.result-score .rs-name {
  font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--ink-faint); font-weight: 700;
}
.result-score .rs-num {
  font-family: 'Helvetica Neue', system-ui, sans-serif;
  font-weight: 900; font-style: italic;
  font-size: 2.6rem; line-height: 1;
}
.result-score.win .rs-num { color: var(--accent); }
.result-detail { color: var(--ink-soft); margin: 14px 0 24px; }
.result-actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

/* ------ Editor modal ------ */
.modal {
  position: fixed; inset: 0; background: rgba(0, 0, 0, 0.7);
  display: flex; align-items: center; justify-content: center;
  padding: 20px; z-index: 100;
}
.modal[hidden] { display: none !important; }
.modal__sheet {
  background: var(--card); border: 1px solid var(--card-line);
  border-radius: var(--radius); padding: 28px 28px 24px;
  max-width: 600px; width: 100%;
  position: relative; max-height: 92vh; overflow-y: auto;
}
.modal__close {
  position: absolute; top: 10px; right: 16px;
  background: transparent; border: none; color: var(--ink-soft);
  font-size: 2rem; cursor: pointer; line-height: 1;
}
.modal__close:hover { color: var(--accent); }
.modal__sheet h2 { margin: 0 0 6px; font-weight: 900; font-style: italic; text-transform: uppercase; }
.editor-help { color: var(--ink-soft); font-size: 0.95rem; line-height: 1.5; }
.editor-help code {
  background: var(--bg-1); padding: 1px 6px; border-radius: 4px; font-size: 0.88em;
}
#editor-textarea {
  width: 100%; min-height: 220px;
  background: var(--bg-0); color: var(--ink);
  border: 1px solid var(--card-line); border-radius: 10px;
  padding: 14px; font-family: ui-monospace, 'SF Mono', Consolas, monospace;
  font-size: 0.92rem; line-height: 1.5; margin: 10px 0 12px;
  resize: vertical;
}
.editor-toggle {
  display: flex; align-items: center; gap: 10px;
  color: var(--ink-soft); font-size: 0.95rem; margin-bottom: 10px;
  cursor: pointer;
}
.editor-toggle input { transform: scale(1.2); accent-color: var(--accent); }
.editor-stats { color: var(--ink-faint); font-size: 0.88rem; margin-bottom: 14px; }
.editor-actions { display: flex; justify-content: flex-end; gap: 10px; }

/* ------ Footer ------ */
footer {
  text-align: center; padding: 30px 24px 50px;
  color: var(--ink-faint); font-size: 0.88rem;
}
.disclaimer {
  font-size: 0.75rem; opacity: 0.55; max-width: 640px; margin: 8px auto 0;
  line-height: 1.5;
}

/* ------ Responsive ------ */
@media (max-width: 560px) {
  .screen { padding: 20px 14px 40px; }
  .players { grid-template-columns: 1fr; }
  .players .vs { display: none; }
  .mode-picker { grid-template-columns: 1fr; }
  .word-stage { padding: 24px 18px; }
  .duel-scoreboard { grid-template-columns: 1fr 1fr; }
  .target-mid { display: none; }
  .clock-head { grid-template-columns: 1fr 1fr; }
  .clock-score { grid-column: span 2; text-align: center; }
}