/* ===== CSS Variables ===== */
:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --error-color: #ef4444;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --bg-light: #f8fafc;
  --white: #ffffff;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
}

/* ===== Reset & Base Styles ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans TC',
    'Microsoft JhengHei', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== Container ===== */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* ===== Header ===== */
.form-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.form-header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.form-header .subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* ===== Form Sections ===== */
.application-form {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 2rem;
}

.form-section {
  margin-bottom: 2.5rem;
}

.form-section:last-of-type {
  margin-bottom: 2rem;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--primary-color);
}

/* ===== Trip Planning Subsections ===== */
.trip-planning-subsection {
  margin-bottom: 2.5rem;
  padding: 1.5rem;
  background-color: var(--bg-light);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.trip-planning-subsection:last-child {
  margin-bottom: 0;
}

.subsection-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

/* ===== Form Groups ===== */
.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.form-group label.required::after {
  content: ' *';
  color: var(--error-color);
}

/* ===== Form Inputs ===== */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="date"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

input[type="text"]:disabled,
input[type="text"][readonly],
input[type="number"]:disabled,
select:disabled {
  background-color: var(--bg-light);
  cursor: not-allowed;
}

textarea {
  resize: vertical;
  min-height: 100px;
}

select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
  appearance: none;
}

/* ===== Address Groups ===== */
.address-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.address-detail {
  margin-top: 0.75rem;
}

/* ===== Checkbox Groups ===== */
.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  font-size: 0.9375rem;
  font-weight: 400;
  cursor: pointer;
  margin-bottom: 0;
}

.checkbox-group input[type="checkbox"] {
  width: 1.125rem;
  height: 1.125rem;
  margin-right: 0.5rem;
  cursor: pointer;
  accent-color: var(--primary-color);
}

/* ===== Radio Groups ===== */
.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.radio-group label {
  display: flex;
  align-items: center;
  font-size: 0.9375rem;
  font-weight: 400;
  cursor: pointer;
  margin-bottom: 0;
}

.radio-group input[type="radio"] {
  width: 1.125rem;
  height: 1.125rem;
  margin-right: 0.5rem;
  cursor: pointer;
  accent-color: var(--primary-color);
}

/* ===== Other Language Input ===== */
.other-language-group {
  margin-top: 0.75rem;
}

.other-language-group input {
  max-width: 300px;
}

/* ===== Luggage Capacity Group ===== */
.luggage-capacity-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.luggage-size-input {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
  min-width: 150px;
}

.luggage-size-input label {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0;
  white-space: nowrap;
}

.luggage-size-input input {
  flex: 1;
  min-width: 80px;
}

/* ===== Character Count ===== */
.char-count {
  text-align: right;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

/* ===== Error Messages ===== */
.error-message {
  display: block;
  font-size: 0.8125rem;
  color: var(--error-color);
  margin-top: 0.25rem;
  min-height: 1.25rem;
}

.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea {
  border-color: var(--error-color);
}

.form-group.has-error input:focus,
.form-group.has-error select:focus,
.form-group.has-error textarea:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

/* ===== Buttons ===== */
.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.btn {
  padding: 0.625rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  min-width: 120px;
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--white);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--white);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-light);
}

.btn:active {
  transform: translateY(1px);
}

/* ===== Success Modal ===== */
.success-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal-content {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
  max-width: 400px;
  width: 100%;
  box-shadow: var(--shadow-lg);
}

.success-icon {
  width: 4rem;
  height: 4rem;
  background-color: var(--success-color);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin: 0 auto 1.5rem;
}

.modal-content h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.modal-content p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* ===== Image Upload Component ===== */
.image-upload-container {
  margin-top: 0.5rem;
}

.image-upload-area {
  position: relative;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
  background-color: var(--bg-light);
  transition: all 0.3s ease;
  cursor: pointer;
}

.image-upload-area:hover {
  border-color: var(--primary-color);
  background-color: rgba(37, 99, 235, 0.02);
}

.image-upload-area.drag-over {
  border-color: var(--primary-color);
  background-color: rgba(37, 99, 235, 0.05);
  transform: scale(1.01);
}

.upload-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.upload-icon {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.image-upload-area:hover .upload-icon {
  color: var(--primary-color);
}

.upload-text {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
  margin: 0;
}

.upload-hint {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin: 0;
}

.image-preview-container {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.image-preview {
  max-width: 100%;
  max-height: 300px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  object-fit: contain;
}

.remove-image-btn {
  position: absolute;
  top: -0.5rem;
  right: -0.5rem;
  width: 2rem;
  height: 2rem;
  background-color: var(--error-color);
  color: var(--white);
  border: 2px solid var(--white);
  border-radius: 50%;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  box-shadow: var(--shadow-md);
}

.remove-image-btn:hover {
  background-color: #dc2626;
  transform: scale(1.1);
}

.image-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  text-align: center;
}

.image-name {
  font-weight: 500;
  color: var(--text-primary);
  word-break: break-all;
}

.image-size {
  color: var(--text-secondary);
}

/* Image upload error state */
.form-group.has-error .image-upload-area {
  border-color: var(--error-color);
}

.form-group.has-error .image-upload-area:hover {
  border-color: var(--error-color);
  background-color: rgba(239, 68, 68, 0.02);
}

/* Loading state for image upload */
.image-upload-area.loading {
  pointer-events: none;
  opacity: 0.6;
}

.image-upload-area.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 2rem;
  height: 2rem;
  margin: -1rem 0 0 -1rem;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ===== Responsive Design ===== */
@media (min-width: 640px) {
  .container {
    padding: 3rem 1.5rem;
  }

  .form-header h1 {
    font-size: 2.5rem;
  }

  .application-form {
    padding: 2.5rem;
  }
}

@media (min-width: 768px) {
  .form-row {
    grid-template-columns: 1fr 1fr;
  }

  .checkbox-group {
    gap: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 4rem 2rem;
  }

  .application-form {
    padding: 3rem;
  }
}

/* ===== Utility Classes ===== */
.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: 0.5rem;
}

.mb-1 {
  margin-bottom: 0.5rem;
}