:root {
  --primary: #5c2483;
  --primary-hover: #481a69;
  --blue: #2563eb;
  --blue-hover: #1d4ed8;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --success: #10b981;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --font-family: 'Sarabun', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
}

/* Header */
.app-header {
  background: linear-gradient(135deg, #4a154b, #6b21a8);
  color: #ffffff;
  padding: 0.9rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 1rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.pea-badge {
  background: #ffffff;
  color: #5c2483;
  font-weight: 800;
  font-size: 0.95rem;
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  letter-spacing: 0.5px;
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.app-header h1 {
  font-size: 1.2rem;
  font-weight: 700;
}

.app-header .subtitle {
  font-size: 0.85rem;
  opacity: 0.9;
}

.header-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.55rem 1rem;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: all 0.18s ease;
  white-space: nowrap;
}

.btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.84rem;
  background-color: #f1f5f9;
  color: #334155;
  border: 1px solid #cbd5e1;
}
.btn-sm:hover {
  background-color: #e2e8f0;
}

.btn-primary {
  background-color: var(--blue);
  color: #ffffff;
  border: none;
}
.btn-primary:hover {
  background-color: var(--blue-hover);
}

.btn-danger {
  background-color: var(--danger);
  color: #ffffff;
  border: none;
}
.btn-danger:hover {
  background-color: var(--danger-hover);
}

.btn-secondary,
.btn-outline {
  background-color: rgba(255, 255, 255, 0.16);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.35);
}
.btn-secondary:hover,
.btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.28);
}

/* Project Status Bar */
.project-bar {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  padding: 0.7rem 2rem;
}

.project-bar-inner {
  max-width: 1240px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.project-title-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex: 1;
  min-width: 280px;
}

.project-title-group label {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.9rem;
  white-space: nowrap;
}

.project-title-group input {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  border: 1px dashed #cbd5e1;
  background: #f8fafc;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  width: 100%;
  max-width: 480px;
}
.project-title-group input:focus {
  border: 1px solid var(--primary);
  background: #ffffff;
  outline: none;
}

.project-options-group {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.red-toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-size: 0.88rem;
  cursor: pointer;
  user-select: none;
}

.red-toggle-label input {
  accent-color: #dc2626;
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.red-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #dc2626;
  display: inline-block;
}

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.86rem;
  color: #065f46;
  font-weight: 600;
}

.status-indicator .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.5);
}

/* Main Container */
.main-container {
  max-width: 1240px;
  margin: 1.25rem auto 3rem;
  padding: 0 1.5rem;
}

/* Stepper Tabs Navigation */
.tabs-nav {
  display: flex;
  gap: 0.35rem;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1.25rem;
  overflow-x: auto;
  padding-bottom: 2px;
}

.tab-btn {
  padding: 0.7rem 1rem;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  background: #ffffff;
  border: 1px solid var(--border);
  border-bottom: 3px solid transparent;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
  transition: all 0.18s;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--primary);
  background: #faf5ff;
}

.tab-btn.active {
  color: var(--primary);
  background: #faf5ff;
  border-color: #d8b4fe;
  border-bottom: 3px solid var(--primary);
}

/* Tab Panels */
.tab-panel {
  display: none;
}
.tab-panel.active {
  display: block;
}

/* Step Banner */
.step-banner {
  background: linear-gradient(135deg, #faf5ff, #f3e8ff);
  border: 1px solid #d8b4fe;
  border-radius: 12px;
  padding: 1.1rem 1.5rem;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.step-banner h2 {
  font-size: 1.15rem;
  color: #4a154b;
  font-weight: 700;
}

.step-banner p {
  font-size: 0.88rem;
  color: #581c87;
  margin-top: 0.15rem;
}

.step-banner-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* Cards */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.03);
  margin-bottom: 1.25rem;
  overflow: hidden;
}

.highlight-card {
  border: 2px solid #8b5cf6;
  background: #fdfcff;
}

.card-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: #f8fafc;
}

.card-header h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.card-header p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* Form Grid */
.form-grid {
  padding: 1.25rem 1.5rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

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

.form-group label {
  font-size: 0.9rem;
  font-weight: 600;
  color: #334155;
}

.req {
  color: var(--danger);
}

.form-group input,
.form-group textarea,
.form-group select {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.58rem 0.85rem;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  background-color: #ffffff;
  color: var(--text-main);
  transition: border-color 0.15s;
  width: 100%;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(92, 36, 131, 0.12);
}

.input-with-btn {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.input-with-btn input {
  flex: 1;
}

.hint {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Info Summary Box */
.info-summary-box {
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.95rem;
  background: #ffffff;
}

.info-summary-box span {
  color: #b91c1c;
  font-weight: 600;
}

/* Step 6: 3 Company Invite Rows */
.company-invite-row {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  padding: 1.1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.company-invite-row:last-child {
  border-bottom: none;
}

.company-badge {
  background: #5c2483;
  color: #ffffff;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.55rem 0.95rem;
  border-radius: 8px;
  white-space: nowrap;
  margin-bottom: 0.15rem;
}

.company-inputs {
  flex: 1;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 1rem;
  min-width: 320px;
}

.company-actions {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.15rem;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(2px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hidden {
  display: none !important;
}

.modal-box {
  background: #ffffff;
  border-radius: 12px;
  width: 92%;
  max-width: 620px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.15);
  overflow: hidden;
}

.modal-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  color: var(--text-muted);
}

.modal-body {
  padding: 1.25rem 1.5rem;
  max-height: 70vh;
  overflow-y: auto;
}

.modal-toolbar {
  margin-bottom: 1rem;
}

.projects-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.project-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #f8fafc;
}

.project-item-info strong {
  display: block;
  font-size: 0.96rem;
  color: var(--text-main);
}

.project-item-info small {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.project-item-actions {
  display: flex;
  gap: 0.4rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.75rem;
  right: 1.75rem;
  background: #1e293b;
  color: #ffffff;
  padding: 0.8rem 1.3rem;
  border-radius: 8px;
  font-weight: 500;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.25);
  z-index: 300;
}

.toast.success {
  background: #065f46;
}

.toast.error {
  background: #991b1b;
}

@media (max-width: 768px) {
  .form-grid,
  .company-inputs {
    grid-template-columns: 1fr;
  }
}