:root {
  --bg: #f5f7fb;
  --text: #1f2937;
  --card: #ffffff;
  --line: #dbe2ef;
  --primary: #1755ff;
  --ok: #0f9d58;
  --error: #d93025;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: radial-gradient(circle at top, #eef4ff 0%, #f7f9ff 28%, #eef1f7 100%);
  color: var(--text);
}

.app {
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px;
}

h1 {
  margin: 0;
  font-size: 40px;
}

.subtitle {
  margin-top: 8px;
  font-size: 22px;
}

.nav-buttons {
  display: flex;
  gap: 12px;
  margin: 20px 0;
}

.btn {
  font-size: 24px;
  border: 2px solid var(--line);
  border-radius: 10px;
  padding: 12px 26px;
  cursor: pointer;
  background: #fff;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.card {
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 12px;
  padding: 24px;
}

.hidden {
  display: none;
}

.progress {
  font-size: 26px;
  font-weight: 700;
}

.countdown {
  margin-top: 10px;
  font-size: 24px;
  font-weight: 700;
  color: #b45309;
}

.countdown.urgent {
  color: var(--error);
}

.tip {
  font-size: 20px;
  color: #4b5563;
  margin: 10px 0 20px;
}

.question {
  font-size: 44px;
  font-weight: 700;
  margin: 16px 0;
}

.answer-box {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

input[type="text"] {
  font-size: 30px;
  width: 260px;
  padding: 8px 12px;
  border: 2px solid #9ca3af;
  border-radius: 8px;
}

.feedback {
  min-height: 34px;
  margin-top: 14px;
  font-size: 25px;
  font-weight: 700;
}

.feedback.ok {
  color: var(--ok);
}

.feedback.error {
  color: var(--error);
}

.day-status {
  font-size: 24px;
  margin: 20px 0;
  color: #0f172a;
}

.stats-title {
  margin: 0 0 16px;
  font-size: 32px;
}

.summary-grid {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 14px;
  margin-bottom: 16px;
}

.ability-panel,
.progress-panel {
  border: 2px solid #d7def0;
  border-radius: 14px;
  padding: 14px;
  background: linear-gradient(145deg, #0b1227 0%, #121d3f 58%, #172554 100%);
  color: #dce7ff;
}

.ability-main {
  margin-top: 10px;
  border: 2px solid rgba(255, 255, 255, 0.18);
  border-radius: 14px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 10px;
  padding: 10px;
}

.ability-number {
  font-size: 56px;
  font-weight: 900;
}

.ability-label {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 1px;
}

.ability-metrics p {
  margin: 8px 0;
  font-size: 17px;
}

.progress-list {
  display: grid;
  gap: 8px;
  max-height: 260px;
  overflow: auto;
}

.progress-item {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.45);
  border-radius: 10px;
  padding: 8px 10px;
}

.progress-item header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.progress-item p {
  margin: 8px 0 0;
  font-size: 15px;
}

.trend-up .trend-value {
  color: #34d399;
  font-weight: 700;
}

.trend-down .trend-value {
  color: #fb7185;
  font-weight: 700;
}

.stats-layout {
  display: grid;
  grid-template-columns: minmax(320px, 38%) 1fr;
  gap: 14px;
}

.stats-left,
.stats-right {
  border: 2px solid #dbe4f7;
  border-radius: 14px;
  padding: 12px;
  background: #f9fbff;
}

.panel-title {
  margin: 0 0 10px;
  font-size: 22px;
}

.day-list {
  display: grid;
  gap: 10px;
  max-height: 620px;
  overflow: auto;
  padding-right: 2px;
  overscroll-behavior: contain;
}

.day-card {
  width: 100%;
  border: 2px solid #d5dff8;
  background: linear-gradient(180deg, #ffffff 0%, #f2f7ff 100%);
  border-radius: 12px;
  padding: 10px;
  text-align: left;
  cursor: pointer;
  user-select: none;
}

.day-card:hover {
  border-color: #90a8e7;
  transform: translateY(-1px);
}

.active-day-card {
  border-color: #3b82f6;
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.day-card-header,
.day-card-overview {
  display: flex;
  justify-content: space-between;
  gap: 6px;
  align-items: center;
}

.day-card-ops {
  margin-top: 6px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  font-size: 15px;
}

.rating-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 14px;
  font-weight: 700;
  border: 1px solid transparent;
  white-space: nowrap;
}

.grade-sss {
  color: #102a43;
  background: linear-gradient(90deg, #fef08a, #facc15 35%, #f59e0b);
  border-color: #f59e0b;
}

.grade-ss {
  color: #072f3c;
  background: linear-gradient(90deg, #67e8f9, #22d3ee);
  border-color: #0891b2;
}

.grade-s {
  color: #062e5a;
  background: linear-gradient(90deg, #93c5fd, #60a5fa);
  border-color: #2563eb;
}

.grade-a {
  color: #052e16;
  background: linear-gradient(90deg, #86efac, #4ade80);
  border-color: #16a34a;
}

.grade-b {
  color: #4c0519;
  background: linear-gradient(90deg, #fda4af, #fb7185);
  border-color: #e11d48;
}

.grade-c {
  color: #2b0a0a;
  background: linear-gradient(90deg, #fecaca, #f87171);
  border-color: #dc2626;
}

.detail-panel {
  margin-top: 10px;
}

.question-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 17px;
}

.question-table th,
.question-table td {
  border: 2px solid var(--line);
  padding: 8px;
  text-align: center;
}

#trendCanvas {
  width: 100%;
  max-width: 860px;
  border: 2px solid #243356;
  border-radius: 8px;
  margin: 10px 0 16px;
  background: #0b1227;
}

#dailyCurveCanvas {
  width: 100%;
  border: 2px solid #243356;
  border-radius: 8px;
  margin: 4px 0 12px;
  background: #0b1227;
}

.ok-text {
  color: var(--ok);
  font-weight: 700;
}

.error-text {
  color: var(--error);
  font-weight: 700;
}

body.flash-correct {
  animation: flashGreen 0.4s ease;
}

body.flash-wrong {
  animation: flashRed 0.45s ease;
}

@keyframes flashGreen {
  from {
    background: #c7f4d4;
  }
  to {
    background: var(--bg);
  }
}

@keyframes flashRed {
  from {
    background: #ffd2d2;
  }
  to {
    background: var(--bg);
  }
}

@media (max-width: 980px) {
  .summary-grid,
  .stats-layout {
    grid-template-columns: 1fr;
  }

  .day-list {
    max-height: 300px;
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 32px;
  }

  .subtitle,
  .tip,
  .day-status,
  .question-table,
  .progress,
  .btn {
    font-size: 18px;
  }

  .question {
    font-size: 32px;
  }

  input[type="text"] {
    width: 100%;
    font-size: 28px;
  }
}