:root {
  color-scheme: light;
  --bg: #f5f8ff;
  --card: #ffffff;
  --line: #d8def0;
  --text: #1e2545;
  --muted: #677092;
  --accent: #4f67ff;
  --ok: #1d8f4a;
  --warn: #b64e00;
  --bad: #c12940;
  --shadow: 0 12px 26px rgba(51, 62, 112, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #eaf0ff 0%, var(--bg) 52%);
}

.app-shell {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 16px 44px;
}

.header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin: 0 -4px 14px;
  padding: 14px 4px 12px;
  background: rgba(245, 248, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(216, 222, 240, 0.85);
}

h1 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.35rem);
}

.score-board {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 10px 14px;
  min-width: 180px;
}

.bunny-icon {
  width: 54px;
  height: 54px;
}

.bunny-icon svg {
  width: 100%;
  height: 100%;
}

.ear {
  fill: #ffd2e0;
}

.head {
  fill: #fff;
  stroke: #e0e6f8;
  stroke-width: 1.2;
}

.eye {
  fill: #353f7d;
}

.nose {
  fill: #ff7fa2;
}

.score-content {
  text-align: right;
}

.score-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

.score-value {
  margin: 4px 0;
  font-size: 1.7rem;
  font-weight: 700;
  transform-origin: center;
}

.score-value.score-up {
  animation: spin-up 360ms ease-out;
}

.score-value.score-down {
  animation: spin-down 360ms ease-out;
}

.score-delta {
  margin: 0;
  min-height: 1rem;
  font-size: 0.9rem;
  opacity: 0;
  transform: translateY(6px);
}

.score-delta.show {
  animation: delta-pop 900ms ease forwards;
}

.score-delta.up {
  color: var(--ok);
}

.score-delta.down {
  color: var(--bad);
}

.intro {
  margin: 0 0 14px;
  color: var(--muted);
}

.tasks-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.task-item {
  display: grid;
  grid-template-columns: minmax(260px, 2fr) minmax(140px, 0.9fr) auto;
  align-items: center;
  gap: 10px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
}

.task-item.is-correct {
  border-color: rgba(29, 143, 74, 0.45);
  background: #f5fff8;
}

.task-item.is-locked {
  border-color: rgba(193, 41, 64, 0.28);
  background: #fff6f8;
}

.task-main {
  min-width: 0;
  margin: 4px 0;
}

.task-caption {
  margin: 0 0 4px;
  font-size: 0.98rem;
  font-weight: 400;
  color: var(--muted);
}

.task-title {
  margin: 0 0 6px;
  font-size: 1.16rem;
  font-weight: 700;
  line-height: 1.35;
}

.task-meta {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.2;
}

.task-item input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  font-size: 1rem;
}

.task-item button {
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  padding: 10px 14px;
  cursor: pointer;
}

.task-item button:disabled,
.task-item input:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.task-status {
  grid-column: 1 / -1;
  margin: 2px 0 0;
  font-size: 0.9rem;
}

.task-status.pending {
  color: var(--muted);
}

.task-status.success {
  color: var(--ok);
}

.task-status.warning {
  color: var(--warn);
}

.task-status.error {
  color: var(--bad);
}

.completion-panel {
  margin-top: 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
}

.completion-panel.hidden {
  display: none;
}

.completion-panel h2 {
  margin: 0 0 8px;
}

.completion-panel p {
  margin: 0 0 10px;
}

.server-note {
  font-size: 0.9rem;
  color: var(--muted);
}

.reset-button {
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  padding: 10px 14px;
  cursor: pointer;
}

.api-status {
  margin: 12px 0 0;
  padding: 10px;
  border-radius: 10px;
  background: #f4f7ff;
  color: var(--text);
  min-height: 3.4rem;
  white-space: pre-wrap;
}

@keyframes spin-up {
  0% {
    transform: perspective(300px) rotateX(-80deg) scale(0.86);
  }
  70% {
    transform: perspective(300px) rotateX(8deg) scale(1.08);
  }
  100% {
    transform: perspective(300px) rotateX(0deg) scale(1);
  }
}

@keyframes spin-down {
  0% {
    transform: perspective(300px) rotateX(80deg) scale(1.08);
  }
  70% {
    transform: perspective(300px) rotateX(-8deg) scale(0.9);
  }
  100% {
    transform: perspective(300px) rotateX(0deg) scale(1);
  }
}

@keyframes delta-pop {
  0% {
    opacity: 0;
    transform: translateY(6px);
  }
  20% {
    opacity: 1;
    transform: translateY(0);
  }
  80% {
    opacity: 1;
    transform: translateY(-4px);
  }
  100% {
    opacity: 0;
    transform: translateY(-8px);
  }
}

@media (max-width: 760px) {
  .header {
    flex-direction: column;
    align-items: stretch;
  }

  .score-board {
    align-self: flex-end;
  }

  .task-item {
    grid-template-columns: 1fr;
  }
}