/* ══════════════════════════════════════════════════
   AD Travel Agency — Payments App
   Premium Dark Design System v2
   ══════════════════════════════════════════════════ */

:root {
  /* ── Colors ── */
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-hover: rgba(25, 33, 52, 0.9);
  --bg-input: #182648;
  --bg-input-focus: #1d2e56;

  --border: rgba(255, 255, 255, 0.06);
  --border-focus: rgba(245, 158, 11, 0.5);
  --border-subtle: rgba(255, 255, 255, 0.03);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #f59e0b;

  --accent: #f59e0b;
  --accent-hover: #fbbf24;
  --accent-glow: rgba(245, 158, 11, 0.15);

  --green: #10b981;
  --green-bg: rgba(16, 185, 129, 0.1);
  --red: #ef4444;
  --red-bg: rgba(239, 68, 68, 0.1);
  --blue: #3b82f6;
  --blue-bg: rgba(59, 130, 246, 0.1);

  /* ── Typography ── */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* ── Spacing ── */
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;

  /* ── Shadows ── */
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
  --glow: 0 0 20px rgba(245, 158, 11, 0.1);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(ellipse at top, rgba(245, 158, 11, 0.03) 0%, transparent 60%),
    radial-gradient(ellipse at bottom right, rgba(59, 130, 246, 0.02) 0%, transparent 60%);
}

/* ══════════ HEADER ══════════ */
#app-header {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(17, 24, 39, 0.9));
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-icon {
  font-size: 28px;
  background: linear-gradient(135deg, var(--accent), #d97706);
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius);
  box-shadow: var(--glow);
}

.header-content h1 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text-primary);
}

.subtitle {
  font-size: 12px;
  color: var(--text-accent);
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* ══════════ TABS ══════════ */
#tab-nav {
  max-width: 800px;
  margin: 0 auto;
  padding: 16px 20px 0;
  display: flex;
  gap: 4px;
}

.tab {
  flex: 1;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex; align-items: center; justify-content: center; gap: 8px;
}

.tab:hover { background: var(--bg-card-hover); color: var(--text-primary); }

.tab.active {
  background: var(--bg-secondary);
  color: var(--text-accent);
  border-color: var(--border-focus);
  border-bottom-color: var(--bg-secondary);
}

.tab-icon { font-size: 16px; }

/* ══════════ TAB CONTENT ══════════ */
.tab-content {
  display: none;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px 40px;
  animation: fadeIn 0.3s ease;
}

.tab-content.active { display: block; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ══════════ CARDS ══════════ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  position: relative;
}

.card + .card {
  border-radius: var(--radius-lg);
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.title-icon { font-size: 20px; }

.sub-card {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 8px;
}

.sub-card h3 {
  font-size: 14px;
  color: var(--text-accent);
  font-weight: 600;
  margin-bottom: 16px;
}

.section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 20px 0 12px;
}

/* ══════════ FORM ELEMENTS ══════════ */
.form-group {
  margin-bottom: 20px;
  flex: 1;
}

.form-row {
  display: flex;
  gap: 16px;
}

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
  letter-spacing: 0.3px;
}

.required { color: var(--red); }

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
input[type="date"],
select {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 14px;
  transition: all 0.2s ease;
  outline: none;
}

input:focus, select:focus {
  border-color: var(--border-focus);
  background: var(--bg-input-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input::placeholder { color: var(--text-muted); }

/* ── Date Input Icons ── */
input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(0.7) sepia(0.3) hue-rotate(180deg);
  cursor: pointer;
  width: 20px;
  height: 20px;
  opacity: 0.85;
}

input[type="date"]::-webkit-calendar-picker-indicator:hover {
  opacity: 1;
}

/* Fallback for other browsers */
input[type="date"] {
  color-scheme: dark;
}

.input-with-icon {
  position: relative;
}

.input-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-accent);
  font-weight: 700;
  font-size: 15px;
}

.input-with-icon input {
  padding-left: 32px;
}

.hint {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

.select-wrapper { position: relative; }

select {
  appearance: none;
  cursor: pointer;
  padding-right: 36px;
}

.select-wrapper::after {
  content: '▾';
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

/* ── Search Select (Client dropdown) ── */
.search-select { position: relative; }

.dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-focus);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  max-height: 220px;
  overflow-y: auto;
  z-index: 50;
  box-shadow: var(--shadow-lg);
}

.dropdown.open { display: block; }

.dropdown-item {
  padding: 10px 14px;
  cursor: pointer;
  font-size: 13px;
  border-bottom: 1px solid var(--border-subtle);
  transition: background 0.15s ease;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.dropdown-item:hover { background: var(--accent-glow); }
.dropdown-item:last-child { border-bottom: none; }

.dropdown-item .client-id {
  font-size: 11px;
  color: var(--text-muted);
}

/* ── File Upload ── */
.file-upload {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.file-upload:hover {
  border-color: var(--border-focus);
  background: var(--accent-glow);
}

.file-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.file-upload-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.file-icon { font-size: 28px; }
.file-text { color: var(--text-muted); font-size: 13px; }
.file-selected { color: var(--text-accent); font-weight: 600; font-size: 13px; }

/* ══════════ BUTTONS ══════════ */
.btn-primary {
  width: 100%;
  padding: 14px 24px;
  background: linear-gradient(135deg, var(--accent), #d97706);
  border: none;
  border-radius: var(--radius);
  color: #0a0e1a;
  font-family: var(--font);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  transition: all 0.2s ease;
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
  margin-top: 8px;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(245, 158, 11, 0.4);
}

.btn-primary:active { transform: translateY(0); }

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  padding: 10px 18px;
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-sm);
  color: var(--text-accent);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: rgba(245, 158, 11, 0.2);
  border-color: var(--accent);
}

.btn-outline {
  padding: 10px 18px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
  transition: all 0.2s ease;
}

.btn-outline:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.btn-green {
  padding: 10px 18px;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.35);
  border-radius: var(--radius-sm);
  color: var(--green);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
  transition: all 0.2s ease;
}

.btn-green:hover {
  background: rgba(16, 185, 129, 0.25);
  border-color: var(--green);
}

.btn-link {
  background: none;
  border: none;
  color: var(--text-accent);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  padding: 4px 0;
  display: inline-flex; align-items: center; gap: 4px;
  transition: color 0.2s ease;
  margin-top: -12px;
  margin-bottom: 8px;
}

.btn-link:hover { color: var(--accent-hover); }

/* ══════════ PROCESSING OVERLAY ══════════ */
.processing-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 14, 26, 0.9);
  backdrop-filter: blur(4px);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 10;
}

.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.processing-overlay p {
  color: var(--text-accent);
  font-weight: 600;
  font-size: 14px;
}

/* ══════════ RESULT CARD ══════════ */
.result-card {
  border-radius: var(--radius-lg) !important;
  border-color: rgba(16, 185, 129, 0.2);
  animation: slideUp 0.4s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.result-header.error { color: var(--red); }

.result-icon { font-size: 28px; }

.result-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.result-row span { color: var(--text-secondary); font-size: 13px; }
.result-row strong { color: var(--text-primary); font-size: 14px; }

.result-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

/* ── Post-Payment Navigation ── */
.result-nav {
  display: flex;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.result-nav .btn-primary {
  flex: 1;
  margin-top: 0;
  font-size: 14px;
  padding: 12px 16px;
}

.result-nav .btn-green {
  flex: 1;
  font-size: 14px;
  padding: 12px 16px;
  justify-content: center;
}

/* ══════════ TABLES ══════════ */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

thead {
  background: rgba(15, 23, 42, 0.8);
}

th {
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

td {
  padding: 10px 14px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-primary);
  white-space: nowrap;
}

tbody tr:hover { background: var(--accent-glow); }

.empty-row td {
  text-align: center;
  color: var(--text-muted);
  padding: 24px;
  font-style: italic;
}

/* ══════════ BILLING ══════════ */
.billing-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.billing-stat {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}

.billing-stat.highlight {
  border-color: var(--border-focus);
  background: var(--accent-glow);
}

.billing-label {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.billing-value {
  display: block;
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
}

.billing-value.accent { color: var(--text-accent); }
.billing-value.green { color: var(--green); }

.billing-actions {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

/* ══════════ MODAL ══════════ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 20px;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  position: relative;
  animation: fadeIn 0.2s ease;
}

.modal h3 {
  font-size: 16px;
  margin-bottom: 20px;
  color: var(--text-accent);
}

.modal-close {
  position: absolute;
  top: 12px; right: 16px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 24px;
  cursor: pointer;
}

.modal-close:hover { color: var(--text-primary); }

/* ══════════ TOASTS ══════════ */
#toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  animation: slideIn 0.3s ease;
  box-shadow: var(--shadow);
  max-width: 350px;
}

.toast.success { background: var(--green); color: white; }
.toast.error { background: var(--red); color: white; }
.toast.info { background: var(--blue); color: white; }

@keyframes slideIn { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: translateX(0); } }

/* ══════════ NOTIFICATION BADGE ══════════ */
.notif-sending {
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
  padding: 6px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.notif-sending .mini-spin {
  display: inline-block;
  width: 12px; height: 12px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ══════════ UTILITIES ══════════ */
.hidden { display: none !important; }

/* ══════════ RESPONSIVE ══════════ */
@media (max-width: 640px) {
  .form-row { flex-direction: column; gap: 0; }
  .billing-summary { grid-template-columns: repeat(2, 1fr); }
  .result-actions { flex-direction: column; }
  .result-actions button { width: 100%; justify-content: center; }
  .result-nav { flex-direction: column; }
  .result-nav button { width: 100%; justify-content: center; }
  .billing-actions { flex-direction: column; }
  .billing-actions button { width: 100%; justify-content: center; }
  .header-content h1 { font-size: 16px; }
  .tab { font-size: 12px; padding: 10px 8px; }
  .card { padding: 20px; }
}