/* CGPA Percentage Calculator - #3d85c6 */
:root {
  --cgpa-brand: #3d85c6;
  --cgpa-brand-dark: #2c6396;
  --cgpa-brand-light: #eaf4fb;
  --cgpa-brand-border: #b6d5f2;
  --cgpa-bg: #f4f8fc;
  --cgpa-surface: rgba(255, 255, 255, 0.97);
  --cgpa-solid: #ffffff;
  --cgpa-text: #1a1a1a;
  --cgpa-muted: #64748b;
  --cgpa-shadow: 0 10px 28px rgba(61, 133, 198, 0.12);
  --cgpa-radius: 16px;
  --cgpa-font: 'DM Sans', system-ui, sans-serif;
}

#tool-main {
  font-family: var(--cgpa-font);
  color: var(--cgpa-text);
  background: var(--cgpa-bg);
  background-image: radial-gradient(ellipse 70% 40% at 50% -5%, rgba(61, 133, 198, 0.1), transparent);
  padding-bottom: 16px;
}

.cgpa-wrap {
  max-width: 480px;
  margin: 0 auto;
  padding: 12px 16px 8px;
}

.cgpa-hero {
  text-align: center;
  margin-bottom: 12px;
}

.cgpa-hero h1 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--cgpa-brand);
  margin: 0 0 4px;
  line-height: 1.25;
}

.cgpa-hero p {
  color: var(--cgpa-muted);
  font-size: 0.85rem;
  margin: 0;
}

.cgpa-glass {
  background: var(--cgpa-surface);
  border: 1px solid var(--cgpa-brand-border);
  border-radius: var(--cgpa-radius);
  box-shadow: var(--cgpa-shadow);
  padding: 14px 16px;
  margin-bottom: 10px;
}

.cgpa-modes {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.cgpa-modes button {
  flex: 1;
  padding: 9px 8px;
  border-radius: 10px;
  border: 1px solid var(--cgpa-brand-border);
  background: var(--cgpa-solid);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--cgpa-brand-dark);
  cursor: pointer;
  font-family: inherit;
}

.cgpa-modes button:hover {
  background: var(--cgpa-brand-light);
}

.cgpa-modes button.active {
  background: var(--cgpa-brand);
  border-color: var(--cgpa-brand);
  color: #fff;
}

.cgpa-field {
  margin-bottom: 12px;
}

.cgpa-field label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--cgpa-brand-dark);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.cgpa-input,
.cgpa-select {
  width: 100%;
  padding: 11px 13px;
  font-size: 1.1rem;
  font-weight: 600;
  border: 1.5px solid var(--cgpa-brand-border);
  border-radius: 10px;
  background: #f7fbff;
  box-sizing: border-box;
  font-family: inherit;
  color: var(--cgpa-text);
}

.cgpa-input:focus,
.cgpa-select:focus {
  border-color: var(--cgpa-brand);
  outline: none;
  box-shadow: 0 0 0 2px var(--cgpa-brand-light);
}

.cgpa-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.cgpa-formulas {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.cgpa-formulas button {
  padding: 6px 11px;
  border-radius: 999px;
  border: 1px solid var(--cgpa-brand-border);
  background: var(--cgpa-solid);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--cgpa-brand-dark);
  cursor: pointer;
  font-family: inherit;
}

.cgpa-formulas button:hover {
  background: var(--cgpa-brand-light);
}

.cgpa-formulas button.active {
  background: var(--cgpa-brand);
  border-color: var(--cgpa-brand);
  color: #fff;
}

.cgpa-custom[hidden] {
  display: none !important;
}

.cgpa-hint {
  font-size: 0.72rem;
  color: var(--cgpa-muted);
  margin: 6px 0 0;
  line-height: 1.4;
}

.cgpa-note {
  font-size: 0.72rem;
  color: var(--cgpa-muted);
  margin: 10px 0 0;
  line-height: 1.4;
}

.cgpa-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.cgpa-btn {
  padding: 11px 16px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.92rem;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.cgpa-btn--primary {
  flex: 1;
  background: var(--cgpa-brand);
  color: #fff;
  box-shadow: 0 4px 14px rgba(61, 133, 198, 0.3);
}

.cgpa-btn--primary:hover {
  background: var(--cgpa-brand-dark);
}

.cgpa-btn--ghost {
  background: var(--cgpa-solid);
  border: 1px solid var(--cgpa-brand-border);
  color: var(--cgpa-muted);
  padding-left: 14px;
  padding-right: 14px;
}

.cgpa-btn--sm {
  padding: 7px 14px;
  font-size: 0.8rem;
}

.cgpa-empty {
  text-align: center;
  color: var(--cgpa-muted);
  font-size: 0.85rem;
  padding: 16px 8px;
}

.cgpa-empty[hidden],
.cgpa-result[hidden] {
  display: none !important;
}

.cgpa-result {
  text-align: center;
  background: linear-gradient(145deg, var(--cgpa-brand) 0%, var(--cgpa-brand-dark) 100%);
  border-radius: var(--cgpa-radius);
  padding: 22px 16px;
  margin-bottom: 10px;
  color: #fff;
  box-shadow: 0 12px 32px rgba(61, 133, 198, 0.35);
  animation: cgpaIn 0.3s ease;
}

@keyframes cgpaIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.cgpa-result-label {
  font-size: 0.82rem;
  opacity: 0.9;
  margin: 0 0 6px;
}

.cgpa-result-value {
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.cgpa-result-formula {
  font-size: 0.78rem;
  opacity: 0.85;
  background: rgba(255, 255, 255, 0.12);
  padding: 8px 12px;
  border-radius: 8px;
  margin: 0 0 14px;
  word-break: break-word;
}

.cgpa-result-actions {
  display: flex;
  justify-content: center;
}

.cgpa-result-actions .cgpa-btn--ghost {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}

.cgpa-result-actions .cgpa-btn--ghost:hover {
  background: rgba(255, 255, 255, 0.28);
}

.cgpa-toast {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.25s, transform 0.25s;
}

.cgpa-toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.cgpa-toast--success { background: #166534; color: #fff; }
.cgpa-toast--warning { background: #b45309; color: #fff; }
.cgpa-toast--error { background: #b91c1c; color: #fff; }

@media (max-width: 400px) {
  .cgpa-form-row {
    grid-template-columns: 1fr;
  }
}