/* ==========================================================================
   INTERACTIVE TESTS & CALCULATORS STYLING
   Water Hydration Calculator & Joint Stiffness Assessment Quiz
   ========================================================================== */

.tests-hero {
  background: radial-gradient(circle at 70% 30%, #163052 0%, #0e2038 100%);
  color: #fff;
  padding: 4.5rem 0 3.5rem 0;
  text-align: center;
}

.tests-hero h1 {
  color: #fff;
  font-size: 2.6rem;
  margin-bottom: 0.75rem;
}

.tests-hero p {
  color: #cbd5e1;
  max-width: 680px;
  margin: 0 auto;
  font-size: 1.1rem;
}

.tests-tabs-nav {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.test-tab-btn {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.test-tab-btn:hover, .test-tab-btn.active {
  background: var(--accent-copper);
  border-color: var(--accent-copper);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(197, 143, 68, 0.4);
}

.test-panel-wrapper {
  margin-top: 3.5rem;
}

.test-panel {
  display: none;
}

.test-panel.active {
  display: block;
  animation: fadeInTest 0.35s ease-out;
}

@keyframes fadeInTest {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   1. WATER HYDRATION CALCULATOR STYLES
   ========================================================================== */
.calc-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
  padding: 3rem;
  max-width: 900px;
  margin: 0 auto;
}

.calc-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.calc-input-group {
  margin-bottom: 2rem;
}

.calc-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: 0.75rem;
  font-size: 1rem;
}

.calc-val-display {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent-copper);
  background: var(--accent-copper-light);
  padding: 0.2rem 0.75rem;
  border-radius: var(--radius-sm);
}

/* Custom Range Slider */
.custom-range {
  -webkit-appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: #e2e8f0;
  outline: none;
  transition: background var(--transition-fast);
}

.custom-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-copper);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(197, 143, 68, 0.45);
  border: 3px solid #fff;
  transition: transform var(--transition-fast);
}

.custom-range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

/* Option Chips (Buttons) */
.option-chips {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.chip-btn {
  background: var(--bg-alt);
  border: 1.5px solid var(--border-color);
  padding: 0.65rem 0.5rem;
  border-radius: var(--radius-md);
  text-align: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.chip-btn:hover {
  border-color: var(--accent-copper);
  color: var(--primary-navy);
}

.chip-btn.active {
  background: #fdf6ec;
  border-color: var(--accent-copper);
  color: var(--accent-copper-hover);
  font-weight: 700;
}

/* Water Output Result Box */
.calc-result-box {
  background: linear-gradient(145deg, #0e2038, #163052);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  color: #fff;
  text-align: center;
  box-shadow: 0 10px 25px rgba(14, 32, 56, 0.2);
  position: relative;
  overflow: hidden;
}

.water-indicator-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
  animation: floatWater 3s ease-in-out infinite;
}

@keyframes floatWater {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.calc-result-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #cbd5e1;
  margin-bottom: 0.5rem;
}

.water-liters-num {
  font-size: 3.5rem;
  font-weight: 800;
  color: #38bdf8;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.water-unit {
  font-size: 1.1rem;
  color: #e0f2fe;
}

.hydration-schedule-card {
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-top: 1.5rem;
  text-align: left;
  font-size: 0.825rem;
}

.hydration-schedule-card h5 {
  color: #ffffff;
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.schedule-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.35rem;
  color: #cbd5e1;
}

.schedule-row strong {
  color: #38bdf8;
}

/* ==========================================================================
   2. JOINT STIFFNESS QUIZ STYLES
   ========================================================================== */
.quiz-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
  padding: 3rem;
  max-width: 820px;
  margin: 0 auto;
}

/* Quiz Progress Bar */
.quiz-progress-wrap {
  margin-bottom: 2.5rem;
}

.quiz-progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.quiz-progress-track {
  width: 100%;
  height: 8px;
  background: var(--bg-alt);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  width: 20%;
  background: linear-gradient(90deg, var(--accent-copper), #e0a353);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

/* Quiz Step Containers */
.quiz-step {
  display: none;
}

.quiz-step.active {
  display: block;
  animation: fadeInTest 0.3s ease-out;
}

.quiz-question-title {
  font-size: 1.45rem;
  color: var(--primary-navy);
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.quiz-question-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.quiz-option-label {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.15rem 1.25rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-white);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quiz-option-label:hover {
  border-color: var(--accent-copper);
  background: #fdfaf6;
}

.quiz-option-label input[type="radio"] {
  width: 20px;
  height: 20px;
  accent-color: var(--accent-copper);
}

.quiz-option-label.selected {
  border-color: var(--accent-copper);
  background: var(--accent-copper-light);
}

.option-text-wrap {
  display: flex;
  flex-direction: column;
}

.option-main-text {
  font-weight: 700;
  color: var(--primary-navy);
  font-size: 1rem;
}

.option-sub-text {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.quiz-nav-btns {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

/* Quiz Result Card */
.quiz-result-wrapper {
  text-align: center;
  padding: 1rem 0;
}

.result-meter-circle {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  margin: 0 auto 1.5rem auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 6px solid var(--accent-copper);
  box-shadow: 0 6px 20px rgba(197, 143, 68, 0.25);
  background: #fff;
}

.result-score-num {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--primary-navy);
  line-height: 1;
}

.result-score-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
}

.result-badge-diagnosis {
  display: inline-block;
  padding: 0.4rem 1.25rem;
  border-radius: var(--radius-full);
  font-weight: 800;
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.diag-mild {
  background: #dcfce7;
  color: #166534;
}

.diag-moderate {
  background: #fef3c7;
  color: #92400e;
}

.diag-severe {
  background: #fee2e2;
  color: #991b1b;
}

.result-feedback-box {
  background: var(--bg-alt);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  text-align: left;
  margin-bottom: 2rem;
  border-left: 4px solid var(--accent-copper);
}

.doctor-note-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.doctor-note-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent-copper);
}

.doctor-note-header h4 {
  font-size: 0.95rem;
  margin-bottom: 0.1rem;
}

.doctor-note-header span {
  font-size: 0.75rem;
  color: var(--text-light);
}

/* ==========================================================================
   3. NUTRIENT CHECKER QUICK TOOL
   ========================================================================== */
.nutrient-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.nutrient-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.nutrient-card:hover {
  border-color: var(--accent-copper);
  transform: translateY(-3px);
}

.nutrient-card h4 {
  font-size: 1.15rem;
  color: var(--primary-navy);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nutrient-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.nutrient-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  background: var(--accent-copper-light);
  color: var(--accent-copper-hover);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-top: 0.5rem;
}

@media (max-width: 768px) {
  .calc-grid {
    grid-template-columns: 1fr;
  }
  .calc-card, .quiz-card {
    padding: 1.5rem;
  }
  .option-chips {
    grid-template-columns: 1fr;
  }
  .nutrient-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  .tests-hero {
    padding: 3rem 1rem 2rem 1rem;
  }
  .tests-hero h1 {
    font-size: 1.8rem;
  }
  .tests-tabs-nav {
    flex-direction: column;
    gap: 0.5rem;
  }
  .test-tab-btn {
    width: 100%;
    justify-content: center;
  }
}