.fst-app {
  --fst-bg: #f8fafc;
  --fst-card: #ffffff;
  --fst-text: #0f172a;
  --fst-muted: #64748b;
  --fst-border: #e2e8f0;
  --fst-primary: #0f172a;
  --fst-primary-soft: #e2e8f0;
  max-width: 980px;
  margin: 32px auto;
  color: var(--fst-text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.fst-card {
  background: var(--fst-card);
  border: 1px solid var(--fst-border);
  border-radius: 28px;
  padding: 28px;
  box-shadow: 0 18px 55px rgba(15, 23, 42, 0.08);
}

.fst-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 24px;
}

.fst-header h2 {
  margin: 0 0 6px;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.05;
}

.fst-header p,
.fst-small {
  color: var(--fst-muted);
}

.fst-label {
  display: block;
  margin: 18px 0 8px;
  font-weight: 700;
}

.fst-input {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid var(--fst-border);
  border-radius: 18px;
  padding: 14px 16px;
  font-size: 18px;
  background: white;
}

.fst-input:focus {
  outline: 3px solid rgba(15, 23, 42, 0.12);
  border-color: var(--fst-primary);
}

.fst-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 18px;
  padding: 14px 20px;
  margin-top: 18px;
  background: var(--fst-primary);
  color: #fff;
  font-weight: 800;
  font-size: 16px;
  cursor: pointer;
  text-decoration: none;
}

.fst-button:hover {
  opacity: 0.92;
}

.fst-button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.fst-button-light {
  background: var(--fst-primary-soft);
  color: var(--fst-text);
}

.fst-message {
  margin-top: 14px;
  font-weight: 700;
}

.fst-message-error,
.fst-alert {
  color: #991b1b;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 18px;
  padding: 14px 16px;
  margin-top: 18px;
}

.fst-child-hero {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 20px;
  margin-bottom: 22px;
}

.fst-avatar {
  font-size: 52px;
  line-height: 1;
  margin-bottom: 10px;
}

.fst-child-hero h3 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
}

.fst-child-hero p {
  margin: 6px 0 0;
  color: var(--fst-muted);
}

.fst-balance {
  background: var(--fst-primary);
  color: #fff;
  border-radius: 26px;
  padding: 20px 24px;
  min-width: 190px;
  text-align: right;
}

.fst-balance span {
  display: block;
  opacity: 0.75;
}

.fst-balance strong {
  display: block;
  font-size: 28px;
}

.fst-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 22px 0;
}

.fst-stats > div {
  background: var(--fst-bg);
  border: 1px solid var(--fst-border);
  border-radius: 22px;
  padding: 16px;
}

.fst-stats span {
  display: block;
  color: var(--fst-muted);
  font-size: 14px;
}

.fst-stats strong {
  display: block;
  margin-top: 4px;
  font-size: 20px;
}

.fst-section-title {
  margin-top: 28px;
}

.fst-time-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.fst-time-block {
  border: 1px solid var(--fst-border);
  border-radius: 24px;
  padding: 22px 14px;
  background: #fff;
  cursor: pointer;
  text-align: center;
  color: var(--fst-text);
}

.fst-time-block:hover {
  border-color: var(--fst-primary);
  transform: translateY(-1px);
}

.fst-time-block:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
}

.fst-time-block strong {
  display: block;
  font-size: 30px;
}

.fst-time-block span {
  color: var(--fst-muted);
}

.fst-running {
  min-height: 420px;
  border-radius: 28px;
  background: var(--fst-primary);
  color: #fff;
  padding: 36px;
  text-align: center;
}

.fst-running p {
  color: rgba(255,255,255,0.75);
}

.fst-countdown {
  margin: 24px 0;
  font-size: clamp(70px, 13vw, 150px);
  font-weight: 950;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.fst-progress {
  max-width: 620px;
  height: 18px;
  border-radius: 999px;
  background: rgba(255,255,255,0.18);
  overflow: hidden;
  margin: 0 auto 14px;
}

.fst-progress span {
  display: block;
  height: 100%;
  background: #fff;
  border-radius: 999px;
  transition: width 0.2s linear;
}


.fst-running.fst-warning-yellow {
  background: #f59e0b;
  color: #111827;
}

.fst-running.fst-warning-yellow p {
  color: rgba(17, 24, 39, 0.78);
}

.fst-running.fst-warning-yellow .fst-progress {
  background: rgba(17, 24, 39, 0.18);
}

.fst-running.fst-warning-yellow .fst-progress span {
  background: #111827;
}

.fst-running.fst-warning-red {
  background: #dc2626;
  color: #fff;
}

.fst-running.fst-warning-red p {
  color: rgba(255, 255, 255, 0.82);
}

.fst-admin-button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.fst-admin-button-row .button {
  margin-top: 0;
}


.fst-loading {
  padding: 24px;
  border-radius: 20px;
  background: var(--fst-bg);
  font-weight: 800;
}

.fst-admin-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.fst-admin-box {
  padding: 0;
}

.fst-admin-box .hndle {
  padding: 12px 16px;
  border-bottom: 1px solid #ccd0d4;
}

.fst-admin-box .inside {
  padding: 16px;
}

.fst-admin-form {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  max-width: 520px;
  align-items: start;
}

.fst-admin-form label {
  display: block;
  width: 100%;
  margin: 0;
  font-weight: 600;
}

.fst-admin-form input,
.fst-admin-form select {
  display: block;
  width: 100%;
  max-width: 360px;
  margin-top: 4px;
}

.fst-admin-form .button,
.fst-admin-form button {
  justify-self: start;
  margin-top: 4px;
}

.fst-admin-form .description {
  margin: 0;
  grid-column: 1;
}

.fst-admin-radio-group {
  display: grid;
  gap: 8px;
  margin: 0 0 16px;
  padding: 12px;
  border: 1px solid #dcdcde;
  border-radius: 6px;
  background: #fff;
}

.fst-admin-radio-group label {
  display: block;
}

@media (max-width: 780px) {
  .fst-card {
    padding: 20px;
  }

  .fst-header,
  .fst-child-hero {
    grid-template-columns: 1fr;
    display: grid;
  }

  .fst-balance {
    text-align: left;
  }

  .fst-stats,
  .fst-time-grid,
  .fst-admin-grid {
    grid-template-columns: 1fr;
  }
}

.fst-marbles-card {
  background: #f8fafc;
  border: 1px solid var(--fst-border);
  border-radius: 24px;
  padding: 16px;
  margin: 18px 0 22px;
}

.fst-marbles-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
  margin-bottom: 12px;
}

.fst-marbles-heading span,
.fst-marbles-rest,
.fst-no-marbles {
  color: var(--fst-muted);
  font-size: 14px;
}

.fst-marbles {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  align-items: center;
}

.fst-marble {
  width: 28px;
  height: 28px;
  display: inline-block;
  border-radius: 999px;
  border: 2px solid #0f172a;
  box-shadow: inset -5px -6px 8px rgba(15, 23, 42, 0.16), inset 5px 5px 8px rgba(255, 255, 255, 0.85), 0 2px 6px rgba(15, 23, 42, 0.12);
}

.fst-marble-full {
  background: radial-gradient(circle at 35% 30%, #ffffff 0 10%, #cbd5e1 12% 30%, #0f172a 100%);
}

.fst-marble-partial {
  background: linear-gradient(to top, #0f172a 0 var(--fst-fill), #ffffff var(--fst-fill) 100%);
}

.fst-marble-more {
  min-width: 28px;
  height: 28px;
  padding: 0 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: #e2e8f0;
  color: #0f172a;
  font-size: 12px;
  font-weight: 800;
}

.fst-sound-test {
  margin-top: 16px;
}

.fst-sound-hint {
  max-width: 620px;
  margin: 18px auto 0;
  text-align: left;
}

@media (max-width: 780px) {
  .fst-marbles-heading {
    display: grid;
  }
}