:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --accent-gradient: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
  --primary-color: #667eea;
  --text-dark: #252525;
  --text-muted: #333;
  --border-color: #e1e5e9;
  --error-color: #dc3545;
  --error-bg: #fff8f8;
  --holiday-color: #e53e3e;
  --holiday-bg: #fff5f5;
  --holiday-border: #feb2b2;
  --full-bg: #f7fafc;
  --full-border: #edf2f7;
  --full-text: #a0aec0;
  --success-color: #38a169;
  --accent-color: #ff6b6b;
  --card-bg: #ffffff;
  --disabled-bg: #f2f2f2;
  --disabled-text: #999999;
  --disabled-border: #dddddd;
  --subtle-bg: #f8f9ff;
  --overlay-bg: rgba(0, 0, 0, 0.55);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background: var(--primary-gradient);
  color: var(--text-dark);
  font-family: "Poppins", arial, sans-serif;
  line-height: 1.6;
}

/* ============ LOADING SCREEN (BARU) ============ */
.loading-screen {
  position: fixed;
  inset: 0;
  z-index: 99999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #f8f9fa;
  transition: opacity 0.3s ease;
}

.loading-screen.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  margin-bottom: 20px;
  border: 4px solid #dee2e6;
  border-top: 4px solid #667eea;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.loading-screen p {
  color: #6c757d;
  font-size: 1rem;
  font-weight: 500;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ============ ANTI-FLASH (BARU) ============ */
body.ip-checked #mainContent {
  display: block !important;
  animation: fadeInContent 0.5s ease;
}

@keyframes fadeInContent {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ... (CSS existing lainnya tetap sama) ... */

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: clamp(10px, 1.4vw, 20px) clamp(8px, 1.1vw, 15px);
}

.form-wrapper {
  position: relative;
  padding: clamp(16px, 2.1vw, 30px) clamp(12px, 1.7vw, 24px);
  background: var(--card-bg);
  border-radius: clamp(16px, 1.4vw, 20px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.header {
  margin: clamp(10px, 1.4vw, 20px) 0 clamp(20px, 2.1vw, 30px);
  color: var(--card-bg);
  text-align: center;
}

.header h1 {
  margin-bottom: clamp(0px, 0.6vw, 8px);
  font-size: clamp(1.5rem, 2.9vw, 2.5rem);
  font-weight: 600;
  line-height: 1.2;
}

.header p {
  font-size: clamp(0.9rem, 1.4vw, 1.25rem);
  opacity: 0.9;
}

.form-section {
  margin-bottom: clamp(0px, 1.7vw, 24px);
}

.form-section h3 {
  margin-bottom: clamp(0px, 1.1vw, 16px);
  color: var(--text-muted);
  font-size: clamp(1.1rem, 1.3vw, 1.1rem);
  font-weight: 600;
}

.field-group {
  margin-bottom: clamp(12px, 1.1vw, 16px);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(12px, 1.1vw, 16px);
}

.field {
  position: relative;
}

.field.full-width {
  grid-column: 1 / -1;
}

.field label {
  margin-bottom: clamp(0px, 0.6vw, 8px);
  display: block;
  color: var(--text-muted);
  font-size: clamp(0.875rem, 1vw, 0.875rem);
  font-weight: 500;
}

.field input,
.placeholder-input {
  width: 100%;
  padding: clamp(0px, 0.9vw, 12px) clamp(0px, 1.1vw, 16px);
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  border-radius: clamp(0px, 0.9vw, 12px);
  font-size: clamp(0.95rem, 1.1vw, 0.95rem);
  font-family: inherit;
  transition: all 0.3s;
}

.field input:focus,
.placeholder-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.field input.error-border {
  background-color: var(--error-bg);
  border-color: var(--error-color) !important;
}

.placeholder-input {
  position: relative;
  cursor: pointer;
}

.placeholder-input::after {
  position: absolute;
  top: 50%;
  right: clamp(0px, 1.1vw, 16px);
  content: "▼";
  color: var(--primary-color);
  font-size: clamp(0.75rem, 0.9vw, 0.75rem);
  transform: translateY(-50%);
}

.placeholder-input.no-arrow {
  background-color: #f9f9f9;
  background-image: none !important;
  border-color: var(--border-color);
  cursor: default;
  pointer-events: none;
}

.placeholder-input.no-arrow::after {
  display: none !important;
}

.date-options {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 1000;
  max-height: 250px;
  margin-top: clamp(0px, 0.4vw, 6px);
  display: none;
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  border-radius: clamp(0px, 0.9vw, 12px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  overflow-y: auto;
}

.date-options.show {
  display: block;
}

.date-list {
  padding: clamp(0px, 0.6vw, 8px);
}

.trial-date {
  width: 100%;
  margin-bottom: clamp(0px, 0.3vw, 4px);
  padding: clamp(0px, 0.7vw, 10px) clamp(0px, 1vw, 14px);
  background: var(--card-bg);
  border: 2px solid transparent;
  border-radius: clamp(0px, 0.6vw, 8px);
  color: inherit;
  font-size: clamp(0.875rem, 1vw, 0.875rem);
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: all 0.3s;
}

.trial-date:hover,
.trial-date.selected {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: var(--card-bg);
}

.trial-date.status-holiday {
  background-color: var(--holiday-bg) !important;
  border: 1px solid var(--holiday-border) !important;
  color: var(--holiday-color) !important;
  font-weight: 600;
  cursor: not-allowed !important;
}

.trial-date.status-holiday .status-text {
  color: inherit !important;
}

.trial-date.status-full {
  background-color: var(--full-bg) !important;
  border: 1px solid var(--full-border) !important;
  color: var(--full-text) !important;
  cursor: not-allowed !important;
}

.trial-date.status-full .status-text {
  color: var(--holiday-color) !important;
  font-weight: 600;
}

#timeSlotsContainer {
  margin-top: 4px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 10px;
}

.time-placeholder {
  padding: 15px;
  grid-column: 1 / -1;
  color: #888;
  font-size: 0.9rem;
  text-align: center;
}

.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(8px, 0.9vw, 12px);
}

.radio-group input[type="radio"],
.time-radio input[type="radio"] {
  display: none;
}

.radio-group label {
  min-width: 120px;
  padding: clamp(10px, 0.9vw, 12px) clamp(14px, 1.1vw, 16px);
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: center;
  gap: clamp(0px, 0.6vw, 8px);
  border: 2px solid var(--border-color);
  border-radius: clamp(0px, 0.7vw, 10px);
  font-size: clamp(0.9rem, 1vw, 0.9rem);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s;
}

.radio-group label:hover,
.time-radio label:hover {
  background: var(--subtle-bg);
  border-color: var(--primary-color);
}

.radio-group label:has(input:checked),
.time-radio input[type="radio"]:checked + label {
  background: var(--primary-color);
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.3);
  color: var(--card-bg) !important;
}

.radio-group label:has(input:disabled:checked) {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: var(--card-bg) !important;
  opacity: 1;
  cursor: default;
}

.radio-group label:has(input:disabled:not(:checked)) {
  opacity: 0.4;
  cursor: not-allowed;
}

.time-radio label {
  min-height: 60px;
  padding: clamp(8px, 0.7vw, 10px) 5px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--card-bg);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  line-height: 1.2;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.time-radio label.disabled,
.time-radio input:disabled + label {
  background-color: var(--disabled-bg);
  border-color: var(--disabled-border);
  color: var(--disabled-text);
  opacity: 0.7;
  cursor: not-allowed;
}

.time-radio label small {
  color: var(--success-color);
}

.time-radio input:disabled + label small {
  color: var(--holiday-color) !important;
  font-weight: 600;
}

.time-text {
  font-size: 0.95rem;
  font-weight: 600;
}

.slot-badge {
  margin-top: 3px;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.75rem;
}

.slot-badge.available {
  background-color: #38a169;
  color: #e8f8ec;
}

.slot-badge.full {
  background-color: #fde8e8;
  color: var(--error-color);
}

.helper-text {
  display: block;
  margin-top: clamp(0px, 0.4vw, 6px);
  color: #666666;
  font-size: clamp(0.75rem, 0.9vw, 0.75rem);
  font-style: italic;
  line-height: 1.4;
}

#waError {
  transition: all 0.3s ease;
}

.submit-btn {
  width: 100%;
  margin-top: clamp(0px, 1.4vw, 20px);
  margin-bottom: clamp(0px, 0.7vw, 10px);
  padding: clamp(14px, 1.1vw, 16px);
  background: var(--accent-color);
  border: none;
  border-radius: clamp(0px, 0.9vw, 12px);
  color: var(--card-bg);
  font-size: clamp(0.95rem, 1.1vw, 1rem);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
}

.submit-btn:hover:not(:disabled):not(.loading) {
  background: #c9423b;
}

.submit-btn:disabled,
.submit-btn.loading {
  background: #cccccc !important;
  box-shadow: none !important;
  transform: none !important;
  cursor: not-allowed !important;
}

.popup-overlay {
  position: fixed;
  inset: 0;
  z-index: 99999;
  padding: clamp(0px, 1.4vw, 20px);
  display: none;
  align-items: center;
  justify-content: center;
  background: var(--overlay-bg);
}

.popup-overlay.show {
  display: flex;
}

.popup-box {
  width: 100%;
  max-width: 420px;
  padding: clamp(0px, 1.7vw, 24px);
  background: var(--card-bg);
  border-radius: clamp(0px, 1.3vw, 18px);
  text-align: center;
  animation: popupShow 0.25s ease;
}

.popup-box h3 {
  margin-bottom: clamp(0px, 0.7vw, 10px);
  color: var(--text-dark);
  font-size: clamp(1.25rem, 1.4vw, 1.25rem);
}

.popup-box p {
  margin-bottom: clamp(0px, 1.4vw, 20px);
  color: #555555;
  font-size: clamp(0.9rem, 1vw, 0.9rem);
  line-height: 1.6;
}

.popup-box button {
  width: 100%;
  padding: clamp(0px, 0.9vw, 12px);
  background: var(--accent-color);
  border: none;
  border-radius: clamp(0px, 0.9vw, 12px);
  color: var(--card-bg);
  font-size: clamp(0.95rem, 1.1vw, 0.95rem);
  font-weight: 600;
  cursor: pointer;
}

.popup-icon {
  margin-bottom: clamp(0px, 0.9vw, 12px);
  font-size: clamp(2.5rem, 2.9vw, 2.5rem);
}

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  margin-left: clamp(0px, 0.7vw, 10px);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top: 2px solid var(--card-bg);
  border-radius: 50%;
  vertical-align: middle;
  animation: spin 1s linear infinite;
}

@keyframes popupShow {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 30px;
  }

  .form-wrapper {
    padding: 18px;
    border-radius: 12px;
  }

  .field-group {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .field input,
  .placeholder-input {
    width: 100%;
    padding: 8px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: clamp(0.95rem, 1.1vw, 0.95rem);
    font-family: inherit;
    transition: all 0.3s;
  }

  #timeSlotsContainer {
    grid-template-columns: repeat(2, 1fr);
  }

  .radio-group {
    flex-direction: column;
    gap: clamp(8px, 0.9vw, 12px);
  }

  .radio-group label {
    width: 100%;
    min-width: unset;
    padding: clamp(10px, 0.9vw, 12px) clamp(14px, 1.1vw, 16px);
  }

  .time-radio label {
    min-height: 48px;
    padding: clamp(8px, 0.7vw, 10px) 5px;
    font-size: clamp(0.85rem, 1vw, 0.9rem);
  }

  .helper-text {
    margin-top: 4px;
    font-size: 0.55rem;
    font-style: italic;
    line-height: 1.2;
  }

  .popup-overlay {
    padding: clamp(20px, 1.4vw, 20px);
  }

  .popup-box {
    padding: clamp(24px, 1.7vw, 24px);
    border-radius: clamp(18px, 1.3vw, 18px);
  }

  .popup-box h3 {
    margin-bottom: clamp(10px, 0.7vw, 10px);
    font-size: clamp(1.5rem, 1.7vw, 1.5rem);
  }

  .popup-box p {
    margin-bottom: clamp(15px, 1.1vw, 15px);
    font-size: clamp(0.8rem, 0.9vw, 0.8rem);
    line-height: 1.4;
  }

  .popup-box button {
    width: auto;
    margin-bottom: clamp(15px, 1.1vw, 15px);
    padding: clamp(12px, 0.9vw, 12px);
    border-radius: clamp(8px, 0.6vw, 8px);
    font-size: clamp(0.85rem, 1vw, 0.85rem);
    cursor: pointer;
  }

  .popup-icon {
    margin-bottom: clamp(15px, 1.1vw, 15px);
    font-size: clamp(2.5rem, 2.9vw, 2.5rem);
  }
}