* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

.page {
  max-width: 1680px;
  margin: 0 auto 40px;
  background: var(--panel-bg);
  padding: 24px;
  width: calc(100% - 48px);
  border-radius: 18px;
  border: 1px solid var(--border);
  box-shadow: 0 18px 36px var(--shadow);
  color: var(--heading);
}

h1 {
  text-align: center;
  color: var(--heading);
  margin: 0 0 24px;
  font-size: 26px;
  font-weight: 600;
}

.controls {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: flex-end;
  margin-bottom: 18px;
}

.donem-controls {
  margin-top: -6px;
}

.donem-controls .control-group {
  max-width: 280px;
  flex: 0 1 280px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 140px;
  flex: 1;
}

.control-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--heading);
}

.control-group input,
.control-group select {
  border: 1px solid var(--input-border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
  background: var(--input-bg);
  color: var(--input-text);
  min-height: 42px;
}

.control-group input:focus,
.control-group select:focus {
  outline: 2px solid #94a3b8;
  outline-offset: 1px;
}

.control-action {
  flex: 0 0 auto;
  min-width: 120px;
}

.show-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  min-height: 42px;
  border-radius: 10px;
  border: 1px solid var(--button-primary-border);
  background: var(--button-primary-bg);
  color: var(--button-primary-text);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
}

.show-btn:disabled {
  opacity: 0.65;
  cursor: wait;
}

.status-message {
  margin: 0 0 14px;
  font-size: 14px;
  color: var(--body-text);
}

.status-message.error {
  color: #f87171;
}

html[data-theme="light"] .status-message.error {
  color: #b91c1c;
}

.results {
  display: grid;
  gap: 12px;
}

.result-heading {
  padding: 0 4px;
}

.term-block {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  box-shadow: 0 8px 18px var(--shadow);
}

.term-title {
  margin: 0 0 6px;
  font-size: 18px;
  color: var(--heading);
}

.term-subtitle {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--body-text);
}

.chart-wrap {
  position: relative;
  width: 100%;
  height: 280px;
  margin-bottom: 16px;
}

.grade-table-wrap {
  overflow-x: auto;
}

.grade-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--table-bg);
  font-size: 14px;
}

.grade-table th,
.grade-table td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  color: var(--heading);
}

.grade-table th {
  background: var(--table-header-bg);
  font-weight: 600;
}

.grade-table .text-end {
  text-align: right;
}

@media (max-width: 900px) {
  .topbar {
    flex-wrap: wrap;
    gap: 8px;
  }

  .topbar-right {
    flex-wrap: wrap;
    flex: 1;
    min-width: 0;
    justify-content: flex-end;
  }

  .auth-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  h1 {
    font-size: 22px;
  }

  .control-group {
    min-width: calc(50% - 6px);
  }

  .control-action {
    width: 100%;
  }

  .show-btn {
    width: 100%;
  }

  .chart-wrap {
    height: 240px;
  }
}