:root {
  --terms-violet: #6556d9;
  --terms-violet-dark: #4435b3;
  --terms-violet-soft: #efedff;
  --terms-yellow: #ffd665;
}

.terms-page { background: #f7f8fc; }
.terms-page button { font: inherit; }
.terms-page [hidden] { display: none !important; }

.terms-hero {
  padding: clamp(52px, 7vw, 88px) 0;
  border-bottom: 1px solid #dedff0;
  background:
    radial-gradient(circle at 82% 22%, rgba(255, 214, 101, .32), transparent 25%),
    radial-gradient(circle at 12% 85%, rgba(101, 86, 217, .16), transparent 30%),
    linear-gradient(135deg, #fbfbff, #f4f2ff 62%, #fffaf0);
}

.terms-hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(320px, .85fr); gap: clamp(34px, 6vw, 78px); align-items: center; }
.grade-line { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 19px; }
.grade-line span { padding: 6px 11px; border: 1px solid #d1cdf8; border-radius: 999px; background: rgba(255,255,255,.75); color: var(--terms-violet-dark); font-size: .82rem; font-weight: 850; letter-spacing: .035em; text-transform: uppercase; }
.grade-line span:first-child { border-color: var(--terms-violet); background: var(--terms-violet); color: #fff; }
.terms-hero h1 { font-size: clamp(2.4rem, 5vw, 4.65rem); }
.terms-hero p { max-width: 680px; margin: 22px 0 0; color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.25rem); }
.terms-page .button { background: var(--terms-violet); }
.terms-page .button:hover { background: var(--terms-violet-dark); }
.terms-page .button.secondary { background: #fff; color: var(--ink); }

.hero-math { padding: clamp(25px, 4vw, 42px); border: 1px solid #d6d2f8; border-radius: 28px; background: rgba(255,255,255,.88); box-shadow: 0 24px 60px rgba(68,53,179,.16); text-align: center; transform: rotate(1deg); }
.math-chip { padding: 15px 18px; border-radius: 14px; background: #f5f5fb; color: var(--ink); font-family: "Cambria Math", Cambria, Georgia, serif; font-size: clamp(1.35rem, 3vw, 2rem); font-weight: 700; }
.math-chip.accent { background: var(--terms-violet-soft); color: var(--terms-violet-dark); }
.hero-arrow { margin: 8px; color: var(--terms-violet); font-size: 1.5rem; font-weight: 900; }
.hero-result { margin-top: 16px; color: #0f7b6c; font-size: clamp(1.6rem, 3vw, 2.25rem); font-weight: 900; }

.terms-heading { max-width: 800px; }
.terms-page .eyebrow { border-color: #d1cdf8; color: var(--terms-violet-dark); }
.law-browser { display: grid; grid-template-columns: minmax(245px, 330px) minmax(0, 1fr); gap: 20px; }
.law-tabs { display: grid; gap: 10px; align-content: start; }
.law-tab { display: flex; gap: 13px; align-items: center; width: 100%; padding: 15px; border: 1px solid var(--line); border-radius: 15px; background: #fff; color: var(--ink); text-align: left; cursor: pointer; }
.law-tab:hover { border-color: #bcb7ee; }
.law-tab.is-active { border-color: var(--terms-violet); background: var(--terms-violet-soft); box-shadow: 0 10px 25px rgba(68,53,179,.1); }
.law-tab span:last-child { display: grid; }
.law-tab small { margin-top: 2px; color: var(--muted); }
.law-icon { display: grid; flex: 0 0 45px; height: 45px; place-items: center; border-radius: 12px; background: #f3f5f8; color: var(--terms-violet-dark); font-family: "Cambria Math", Cambria, serif; font-size: 1.15rem; font-weight: 900; }
.law-tab.is-active .law-icon { background: var(--terms-violet); color: #fff; }
.law-stage { min-height: 320px; padding: clamp(24px, 4vw, 42px); border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: 0 14px 40px rgba(16,42,67,.07); }
.law-stage-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.law-stage-header span { color: var(--terms-violet-dark); font-size: .8rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.law-stage h3 { margin-top: 8px; font-size: clamp(1.5rem, 3vw, 2.1rem); }
.law-stage p { max-width: 680px; color: var(--muted); }
.law-equation { display: grid; grid-template-columns: 1fr auto 1fr; gap: 15px; align-items: center; margin-top: 28px; }
.law-equation div { padding: 18px; border-radius: 14px; background: #f5f6fa; font-family: "Cambria Math", Cambria, Georgia, serif; font-size: clamp(1.22rem, 3vw, 1.8rem); font-weight: 800; text-align: center; }
.law-equation div:last-child { background: var(--terms-violet-soft); color: var(--terms-violet-dark); }
.law-equation span { color: var(--terms-violet); font-size: 1.6rem; font-weight: 900; }
.law-note { display: flex; gap: 9px; align-items: flex-start; margin-top: 22px; padding: 12px 14px; border-radius: 12px; background: #fff8df; color: #604a00; }

.practice-section { border-block: 1px solid #dedff0; background: #f0effb; }
.practice-layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 22px; align-items: start; }
.practice-sidebar { display: grid; gap: 14px; }
.player-card, .level-picker, .session-card, .rule-reminder { padding: 18px; border: 1px solid #ddddeb; border-radius: 17px; background: #fff; }
.player-card { display: grid; grid-template-columns: 48px 1fr; gap: 11px 13px; align-items: center; }
.player-card .sidebar-label { margin: 0; }
.player-card strong { color: var(--terms-violet-dark); }
.player-avatar { display: grid; grid-row: span 2; width: 48px; height: 48px; place-items: center; border-radius: 15px; background: linear-gradient(135deg, var(--terms-violet), #9b8ff3); color: #fff; font-family: Georgia, serif; font-size: 1.45rem; font-weight: 900; box-shadow: 0 8px 18px rgba(68,53,179,.22); }
.xp-line { grid-column: 1 / -1; height: 7px; overflow: hidden; border-radius: 999px; background: #ececf3; }
.xp-line span { display: block; width: 0; height: 100%; border-radius: inherit; background: linear-gradient(90deg, #ffb82e, #ffd665); transition: width .35s ease; }
.player-card small { grid-column: 1 / -1; color: var(--muted); font-size: .76rem; }
.sidebar-label { display: block; margin-bottom: 10px; color: var(--muted); font-size: .77rem; font-weight: 850; letter-spacing: .07em; text-transform: uppercase; }
.segmented-control { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; padding: 4px; border-radius: 11px; background: #f0f1f5; }
.segmented-control button { padding: 8px 5px; border: 0; border-radius: 8px; background: transparent; color: var(--muted); font-size: .86rem; font-weight: 800; cursor: pointer; }
.segmented-control button.is-active { background: #fff; color: var(--terms-violet-dark); box-shadow: 0 2px 7px rgba(16,42,67,.12); }
.session-head, .score-row { display: flex; justify-content: space-between; gap: 12px; }
.session-head { font-weight: 800; }
.progress-track { height: 9px; margin: 13px 0 15px; overflow: hidden; border-radius: 999px; background: #e8e8f0; }
.progress-track span { display: block; width: 0; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--terms-violet), #9287ef); transition: width .3s ease; }
.score-row { color: var(--muted); font-size: .9rem; }
.score-row strong { color: #0f7b6c; }
.game-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 5px; text-align: center; }
.game-stats div { display: grid; grid-template-columns: auto auto; justify-content: center; gap: 3px; padding: 7px 3px; border-radius: 9px; background: #f7f7fb; color: var(--terms-violet-dark); }
.game-stats small { grid-column: 1 / -1; color: var(--muted); font-size: .66rem; }
.hearts { grid-column: 1 / -1; color: #e34d59; font-size: .82rem; letter-spacing: -1px; white-space: nowrap; }
.rule-reminder { border-color: #efd78b; background: #fffaf0; }
.rule-reminder strong { color: #705600; }
.rule-reminder ol { margin: 10px 0 0; padding-left: 24px; color: #655a36; font-size: .92rem; }
.rule-reminder li + li { margin-top: 4px; }

.exercise-card { min-height: 550px; padding: clamp(22px, 4vw, 38px); border: 1px solid #d8d6ef; border-radius: 22px; background: #fff; box-shadow: 0 18px 45px rgba(68,53,179,.09); }
.exercise-topline { display: flex; justify-content: space-between; gap: 12px; align-items: center; color: var(--muted); font-size: .84rem; font-weight: 800; text-transform: uppercase; letter-spacing: .05em; }
.step-badge { padding: 5px 10px; border-radius: 999px; background: var(--terms-violet-soft); color: var(--terms-violet-dark); }
.expression { margin: 40px 0 22px; color: var(--ink); font-family: "Cambria Math", Cambria, Georgia, serif; font-size: clamp(2rem, 6vw, 3.7rem); font-weight: 800; text-align: center; }
.exercise-question { text-align: center; color: var(--muted); font-size: 1.05rem; font-weight: 700; }
.answer-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 11px; margin-top: 22px; }
.answer-button { min-height: 62px; padding: 11px 14px; border: 1px solid #cfd5df; border-radius: 13px; background: #fff; color: var(--ink); font-weight: 800; cursor: pointer; }
.answer-button:hover { border-color: var(--terms-violet); background: #f9f8ff; }
.answer-button:disabled { cursor: default; opacity: .7; }
.answer-button.is-correct { border-color: #4ba695; background: #eaf8f5; color: #096456; opacity: 1; }
.answer-button.is-wrong { border-color: #df8b85; background: #fff0ef; color: #9c251c; opacity: 1; }
.term-entry { max-width: 680px; margin: 22px auto 0; }
.term-entry > label { display: block; margin-bottom: 7px; color: var(--muted); font-size: .8rem; font-weight: 850; letter-spacing: .05em; text-transform: uppercase; }
.term-input-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 9px; }
.term-input-row input { width: 100%; min-width: 0; padding: 13px 15px; border: 2px solid #c9c7df; border-radius: 12px; color: var(--ink); font-family: "Cambria Math", Cambria, Georgia, serif; font-size: 1.22rem; font-weight: 750; }
.term-input-row input:focus { border-color: var(--terms-violet); outline: 3px solid rgba(101,86,217,.15); }
.term-input-row input.is-wrong { border-color: #d45d54; animation: input-shake .24s ease; }
.keyboard-hint { margin: 7px 2px 0; color: var(--muted); font-size: .8rem; }
.mobile-math-pad { display: none; }
.feedback-panel { margin-top: 18px; padding: 13px 15px; border-radius: 12px; font-weight: 750; }
.feedback-panel.success { background: #eaf8f5; color: #096456; }
.feedback-panel.error { background: #fff0ef; color: #9c251c; }
.feedback-panel.hint { background: #fff8df; color: #604a00; }
.solution-path { display: grid; gap: 0; margin-top: 23px; border: 1px solid #ddddeb; border-radius: 15px; overflow: hidden; }
.path-line { display: grid; grid-template-columns: 135px minmax(0, 1fr); gap: 15px; align-items: center; padding: 12px 15px; background: #f8f8fc; }
.path-line + .path-line { border-top: 1px solid #e7e7f0; }
.path-line span { color: var(--muted); font-size: .79rem; font-weight: 850; text-transform: uppercase; letter-spacing: .04em; }
.path-line strong { font-family: "Cambria Math", Cambria, Georgia, serif; font-size: 1.1rem; }
.path-line.is-current { background: var(--terms-violet-soft); }
.exercise-actions { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-top: 22px; }
.hint-button { padding: 9px 12px; border: 0; background: transparent; color: var(--terms-violet-dark); font-weight: 850; cursor: pointer; }
.reward-pop { position: fixed; z-index: 40; top: 45%; left: 50%; padding: 11px 18px; border-radius: 999px; background: #24204d; color: #fff; font-weight: 900; pointer-events: none; transform: translate(-50%, -50%); animation: reward-pop .8s ease both; }
.confetti-layer { position: fixed; z-index: 35; inset: 0; overflow: hidden; pointer-events: none; }
.confetti-piece { position: absolute; top: -20px; width: 9px; height: 16px; border-radius: 3px; animation: confetti-fall 1.2s ease-in forwards; }

@keyframes input-shake { 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }
@keyframes reward-pop { 0% { opacity: 0; transform: translate(-50%,-20%) scale(.75); } 25% { opacity: 1; transform: translate(-50%,-50%) scale(1.08); } 100% { opacity: 0; transform: translate(-50%,-85%) scale(1); } }
@keyframes confetti-fall { to { transform: translateY(105vh) rotate(520deg); opacity: .2; } }

.method-section { background: #fff; }
.method-card { padding: clamp(24px, 5vw, 48px); border: 1px solid #d8d6ef; border-radius: 25px; background: linear-gradient(135deg, #fbfbff, #f2f0ff); }
.method-card h2 { max-width: 650px; }
.method-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 28px; }
.method-steps div { position: relative; padding: 20px 18px 20px 68px; border-radius: 15px; background: #fff; }
.method-steps span { position: absolute; top: 17px; left: 17px; display: grid; width: 38px; height: 38px; place-items: center; border-radius: 50%; background: var(--terms-violet); color: #fff; font-weight: 900; }
.method-steps strong, .method-steps small { display: block; }
.method-steps small { margin-top: 4px; color: var(--muted); line-height: 1.45; }

@media (max-width: 900px) {
  .terms-hero-grid, .law-browser, .practice-layout { grid-template-columns: 1fr; }
  .hero-math { max-width: 600px; transform: none; }
  .law-tabs { grid-template-columns: repeat(3, 1fr); }
  .law-tab { display: grid; justify-items: center; text-align: center; }
  .law-tab small { display: none; }
}

@media (max-width: 680px) {
  .law-tabs, .method-steps { grid-template-columns: 1fr; }
  .law-tab { display: flex; justify-items: initial; text-align: left; }
  .law-tab small { display: block; }
  .law-equation { grid-template-columns: 1fr; }
  .law-equation span { transform: rotate(90deg); text-align: center; }
  .answer-grid { grid-template-columns: 1fr; }
  .path-line { grid-template-columns: 1fr; gap: 3px; }
  .expression { margin-top: 30px; }
  .term-input-row { grid-template-columns: 1fr; }
  .term-input-row .button { display: none; }
  .keyboard-hint { display: none; }
  .mobile-math-pad { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 7px; margin-top: 11px; padding: 10px; border-radius: 15px; background: #24283b; }
  .mobile-math-pad button { min-height: 47px; padding: 5px; border: 0; border-radius: 9px; background: #fff; color: #182034; font-weight: 900; box-shadow: 0 2px 0 #bfc4cf; }
  .mobile-math-pad .pad-operator { background: #eae7ff; color: var(--terms-violet-dark); }
  .mobile-math-pad .pad-utility { background: #e8edf3; color: #3c4f63; }
  .mobile-math-pad .pad-submit { grid-column: span 2; background: var(--terms-violet); color: #fff; box-shadow: 0 2px 0 var(--terms-violet-dark); }
}

@media (prefers-reduced-motion: reduce) {
  .progress-track span { transition: none; }
  .reward-pop, .confetti-piece, .term-input-row input.is-wrong { animation: none; }
}