/* Theme Colors */
:root {
  --underweight: #ffb347;
  --normal: #4caf50;
  --overweight: #ff7f7f;
  --obese: #ff3b3b;

  --primary: #8a2be2;
  --secondary: #4facfe;
}

/* CARD WRAPPER - CENTER */
.card-wrapper {
  width: 100%;
  display: flex;
  justify-content: center;
  padding: 40px 15px;
}

/* CARD - GLASS THEME */
.card {
  width: 100%;
  max-width: 480px;
  background: rgba(20, 20, 35, 0.65);
  backdrop-filter: blur(12px);
  border-radius: 18px;
  border: 1px solid rgba(138, 43, 226, 0.4);
  box-shadow:
    0 0 25px rgba(138, 43, 226, 0.25),
    0 0 10px rgba(79, 172, 254, 0.2),
    inset 0 0 10px rgba(255,255,255,0.05);
  padding: 25px;
  display: grid;
  gap: 1.2rem;
}

/* CARD CONTAINER - INPUTS + OUTPUTS */
.card-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

/* INPUT SECTION */
.inputs-section {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

/* FORM GROUP */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  color: #ccc;
  font-weight: 600;
  font-size: 0.95rem;
}

/* INPUTS */
.form-group input {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.05);
  color: #fff;
  font-size: 1.1rem;
  text-align: center;
  outline: none;
  transition: 0.2s;
}

.form-group input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 10px rgba(138, 43, 226, 0.4);
}

/* TIP GRID */
.tip-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
}

.tip-grid button {
  padding: 12px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow: 0 0 10px rgba(138, 43, 226, 0.5);
  transition: 0.25s ease;
}

.tip-grid button.active {
  background: var(--primary);
}

.tip-grid button:hover {
  transform: scale(1.05);
  filter: brightness(110%);
}

/* CUSTOM TIP INPUT */
.tip-grid input {
  text-align: center;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.05);
  color: #fff;
  font-size: 1rem;
  padding: 12px;
  outline: none;
}

.tip-grid input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 10px rgba(138, 43, 226, 0.4);
}

/* SUBMIT BUTTON */
.submit-btn {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  font-size: 1rem;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow: 0 0 10px rgba(138, 43, 226, 0.5);
  transition: 0.25s ease;
}

.submit-btn:hover {
  transform: scale(1.05);
  filter: brightness(110%);
}

/* OUTPUT SECTION */
.outputs-section {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  text-align: center;
}

.output-box {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.output-box p {
  color: #fff;
  font-size: 0.95rem;
}

.output-box span {
  font-size: 0.75rem;
  color: #ccc;
}

.output-box h2 {
  font-size: 2rem;
  font-weight: bold;
  color: var(--primary);
}

/* RESET BUTTON */
.reset-btn {
  margin-top: 0.5rem;
  padding: 12px;
  border-radius: 10px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  color: #fff;
  background: #444;
  transition: 0.25s ease;
}

.reset-btn:hover {
  transform: scale(1.05);
  filter: brightness(110%);
}

/* RESPONSIVE */
@media (max-width: 480px) {
  .card {
    padding: 18px;
  }

  .tip-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .output-box h2 {
    font-size: 1.5rem;
  }

  .submit-btn,
  .reset-btn {
    font-size: 0.95rem;
    padding: 10px;
  }
}