* {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
}

:root {
  --bg: #eef8f0;
  --panel: #ffffff;
  --soft: #eefaf7;
  --soft2: #dff8e9;
  --text: #173b34;
  --text-soft: #587b75;
  --muted: #718d86;
  --line: #d9ece3;
  --green: #4dbd87;
  --green-deep: #195a4b;
  --green-dark: #103e33;
  --mint: #b8f0cf;
  --mint-light: #ddf8ea;
  --yellow: #ffd984;
  --orange: #ffb562;
  --coral: #ff8d72;
  --purple: #a594ff;
  --pink: #f7b2cf;
  --blue: #77b9ff;
  --shadow: rgba(20, 74, 54, 0.12);
  --danger: #e66a75;
  --font: "Inter", "Segoe UI", Arial, sans-serif;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 70% 8%, var(--mint-light), transparent 22%),
    radial-gradient(circle at 25% 100%, var(--yellow), transparent 20%),
    var(--bg);
  font-family: var(--font);
  min-height: 100vh;
}

.app {
  min-height: 100vh;
  width: min(1500px, calc(100vw - 40px));
  margin: 0 auto;
  display: flex;
  gap: 24px;
  padding: 22px 0;
}

.sidebar {
  width: 270px;
  background: var(--green-dark);
  color: #fff;
  border-radius: 30px;
  padding: 30px 24px;
  box-shadow: 0 24px 50px var(--shadow);
  position: relative;
  overflow: hidden;
}

.sidebar::before,
.sidebar::after {
  content: "";
  position: absolute;
  background: rgba(255,255,255,.05);
  border-radius: 50%;
}

.sidebar::before {
  width: 180px;
  height: 180px;
  left: -60px;
  top: -50px;
}

.sidebar::after {
  width: 130px;
  height: 130px;
  right: -40px;
  bottom: -20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 24px;
}

.brand-icon {
  width: 50px;
  height: 50px;
  border-radius: 16px;
  background: var(--mint);
  color: var(--green-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 12px 24px rgba(0,0,0,.2);
}

.brand-svg {
  width: 36px;
  height: 36px;
}

.brand-title {
  display: block;
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.06em;
}

.brand-subtitle {
  display: block;
  font-size: 12px;
  opacity: .8;
  letter-spacing: .2em;
  text-transform: uppercase;
}

.brand-description {
  display: block;
  margin-top: 10px;
  font-size: 11px;
  font-weight: 700;
  color: var(--yellow);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.brand-text {
  line-height: 1.4;
}

.student-card {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 20px;
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 32px;
}

.student-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--yellow);
  color: var(--green-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 20px;
}

.student-label {
  display: block;
  font-size: 11px;
  color: var(--mint-light);
  opacity: .8;
  text-transform: uppercase;
}

.student-name {
  display: block;
  font-size: 16px;
  font-weight: 700;
}

.student-card .small-icon {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--soft);
  color: var(--green-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  margin-left: auto;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.nav-link {
  color: #dff8e9;
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid transparent;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: .2s ease;
}

.nav-link .nav-icon {
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: rgba(255,255,255,.06);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-link:hover,
.nav-link.active {
  background: var(--mint);
  color: var(--green-dark);
  border-color: var(--mint-light);
}

.sidebar-footer {
  margin-top: 36px;
}

.day-card {
  border-radius: 22px;
  border: 1px solid rgba(255,255,255,.2);
  background: rgba(255,255,255,.08);
  padding: 22px 18px;
}

.day-label {
  display: block;
  font-size: 11px;
  color: var(--mint-light);
  text-transform: uppercase;
  letter-spacing: .15em;
}

.day-title {
  display: block;
  margin-top: 8px;
  font-size: 24px;
  font-weight: 800;
}

.day-progress {
  display: block;
  margin-top: 14px;
}

.progress-bar {
  height: 8px;
  background: rgba(255,255,255,.1);
  border-radius: 20px;
  display: block;
  overflow: hidden;
}

.progress-fill {
  display: block;
  width: 64%;
  height: 100%;
  background: var(--mint);
  border-radius: inherit;
}

.main {
  flex: 1;
  min-width: 0;
}

.screen {
  display: none;
}

.screen.active {
  display: block;
}

.choice-screen {
  width: 100%;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0 24px;
}

.section-tag {
  color: var(--green-deep);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .2em;
  text-transform: uppercase;
}

.topbar h1 {
  margin: 8px 0 0;
  font-size: clamp(34px, 3vw, 42px);
  color: var(--green-dark);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-button,
.btn,
.user-pill {
  font-family: var(--font);
}

.icon-button {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--green-deep);
  font-size: 26px;
  cursor: pointer;
  box-shadow: 0 12px 30px var(--shadow);
}

.user-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--panel);
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--green-deep);
  font-weight: 800;
  font-size: 13px;
}

.small-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--green-dark);
  color: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  background: var(--panel);
  border-radius: 30px;
  padding: 34px 40px;
  box-shadow: 0 24px 50px var(--shadow);
  border: 1px solid var(--line);
}

.hero-content {
  max-width: min(560px, calc(100vw - 340px));
}

.hero-kicker {
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .22em;
  text-transform: uppercase;
}

.hero-content h2 {
  margin: 14px 0 16px;
  font-size: clamp(40px, 3vw, 56px);
  letter-spacing: -0.04em;
  color: var(--green-dark);
}

.hero-content p {
  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  border: none;
  border-radius: 14px;
  font-weight: 800;
  font-size: 14px;
  padding: 12px 22px;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn.primary {
  background: var(--green-deep);
  color: white;
  box-shadow: 0 12px 24px var(--shadow);
}

.btn.ghost {
  background: var(--mint-light);
  color: var(--green-deep);
  border: 1px solid var(--line);
}

.btn.ghost-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}

.hero-stats {
  display: flex;
  gap: 28px;
  margin-top: 26px;
  flex-wrap: wrap;
}

.hero-stats .stat-number {
  display: block;
  color: var(--green-deep);
  font-size: 34px;
  font-weight: 900;
}

.hero-stats .stat-label {
  display: block;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.hero-art {
  position: relative;
}

.planet {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--mint), var(--green));
  display: flex;
  align-items: center;
  justify-content: center;
  border: 10px solid rgba(255,255,255,.8);
  box-shadow: inset 20px 20px 60px rgba(255,255,255,.7), 0 24px 50px var(--shadow);
}

.planet-inner {
  position: relative;
  width: 100%;
  height: 100%;
}

.planet-sun {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--yellow);
  color: var(--green-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
}

.planet-star {
  position: absolute;
  font-size: 22px;
  color: var(--yellow);
}

.star-one { left: 30px; top: 30px; }
.star-two { right: 30px; top: 70px; font-size: 30px; }
.star-three { right: 20px; bottom: 30px; font-size: 26px; }

.game-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(4, minmax(170px, 1fr));
  gap: 16px;
}

.game-card {
  background: var(--panel);
  border-radius: 24px;
  padding: 26px 20px;
  box-shadow: 0 16px 34px var(--shadow);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease;
}

.game-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px var(--shadow);
}

.game-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.game-icon {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: var(--soft2);
  color: var(--green-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 24px;
}

.game-icon.frac-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  font-size: 20px;
}

.frac-line {
  font-size: 14px;
  margin: 0 3px;
}

.game-badge {
  color: var(--green-deep);
  background: var(--mint-light);
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
}

.game-card-body {
  margin-top: 22px;
}

.game-category {
  color: var(--green);
  font-weight: 900;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
}

.game-card-body h3 {
  margin: 14px 0 12px;
  color: var(--green-dark);
  font-size: 24px;
}

.game-card-body p {
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.55;
}

.game-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.game-level {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.play-arrow {
  font-size: 20px;
  color: var(--green-deep);
}

.game-screen {
  background: var(--panel);
  border-radius: 30px;
  padding: 22px 28px;
  box-shadow: 0 24px 50px var(--shadow);
  min-height: 520px;
}

.game-screen-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.back-button {
  background: var(--soft2);
  color: var(--green-deep);
  border: 1px solid var(--line);
}

.game-title-wrap {
  flex: 1;
}

.game-title-wrap h2 {
  margin: 5px 0 0;
  color: var(--green-dark);
  font-size: clamp(30px, 2vw, 36px);
}

.game-screen-label {
  color: var(--green);
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .22em;
}

.score-panel {
  min-width: 120px;
  text-align: right;
}

.score-label {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
}

.score-value {
  display: block;
  color: var(--green-deep);
  font-size: 36px;
  font-weight: 900;
}

.game-stage {
  margin-top: 24px;
}

.game-render {
  display: flex;
  justify-content: center;
}

.question-card,
.correct-card {
  width: min(760px, 100%);
  background: var(--soft);
  border-radius: 24px;
  padding: 30px;
  border: 1px solid var(--line);
}

.question-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.question-number {
  color: var(--green-deep);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.question-level {
  color: var(--orange);
  font-weight: 900;
  background: var(--yellow);
  border-radius: 999px;
  padding: 8px 14px;
}

.question-text {
  margin-top: 24px;
  color: var(--green-dark);
  font-size: clamp(30px, 2.2vw, 40px);
  font-weight: 800;
  line-height: 1.4;
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(160px, 1fr));
  gap: 14px;
  margin-top: 26px;
}

.answer-button {
  width: 100%;
  border-radius: 16px;
  padding: 14px 16px;
  background: var(--panel);
  color: var(--green-dark);
  border: 1px solid var(--line);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 800;
  cursor: pointer;
  transition: transform .2s ease;
}

.answer-button:hover:not(:disabled) {
  transform: translateY(-2px);
  background: var(--mint-light);
}

.answer-button.correct {
  background: var(--mint);
  border-color: var(--green);
  color: var(--green-deep);
}

.answer-button.wrong {
  background: var(--coral);
  color: white;
  border-color: var(--coral);
}

.answer-button:disabled {
  cursor: default;
}

.question-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 22px;
}

.question-message {
  color: var(--text-soft);
  font-weight: 700;
}

.next-button {
  background: var(--green-deep);
  color: white;
}

.next-button:disabled {
  opacity: .65;
  cursor: not-allowed;
}

.correct-card {
  text-align: center;
}

.correct-card h3 {
  font-size: 34px;
  color: var(--green-dark);
}

.correct-card p {
  color: var(--text-soft);
}

.ranking-screen {
  background: var(--panel);
  border-radius: 30px;
  padding: 22px 28px;
  box-shadow: 0 24px 50px var(--shadow);
}

.ranking-box {
  padding: 24px 0 10px;
}

.ranking-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--soft);
  border-radius: 16px;
  overflow: hidden;
}

.ranking-table th {
  background: var(--green-dark);
  color: white;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 14px 16px;
}

.ranking-table td {
  padding: 16px 14px;
  border-bottom: 1px solid var(--line);
  color: var(--text-soft);
  font-weight: 700;
}

.ranking-table tbody tr:nth-child(even) {
  background: var(--mint-light);
}

.ranking-table .vazio {
  color: var(--muted);
  text-align: center;
}

.ranking-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 20px;
}

.ranking-hint {
  color: var(--muted);
  font-size: 12px;
  margin-top: 16px;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(16, 62, 51, .55);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.active {
  display: flex;
}

.modal-card {
  width: min(440px, calc(100vw - 40px));
  background: var(--panel);
  border-radius: 30px;
  padding: 30px;
  text-align: center;
  box-shadow: 0 30px 80px rgba(0,0,0,.4);
}

.modal-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: var(--yellow);
  color: var(--green-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
}

.modal-card h3 {
  color: var(--green-dark);
  font-size: 30px;
}

.modal-card p {
  color: var(--text-soft);
}

.modal-card input {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--soft);
  padding: 14px 16px;
  font-family: var(--font);
  font-size: 16px;
  color: var(--text);
  outline: none;
}

.modal-card select {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--soft);
  padding: 14px 16px;
  font-family: var(--font);
  font-size: 16px;
  color: var(--text);
  outline: none;
  margin-top: 12px;
}

.modal-card input.input-error {
  border-color: var(--danger);
}

.modal-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 22px;
}

@media (max-width: 960px) {
  .app {
    display: block;
  }

  .sidebar {
    width: 100%;
    margin-bottom: 24px;
  }

  .game-grid {
    grid-template-columns: repeat(2, minmax(180px, 1fr));
  }

  .hero {
    flex-wrap: wrap;
  }
}

@media (max-width: 640px) {
  .game-grid {
    grid-template-columns: 1fr;
  }

  .answer-grid {
    grid-template-columns: 1fr;
  }

  .game-screen-top,
  .topbar {
    flex-wrap: wrap;
  }
}