:root {
  --bg: #f8fafc;
  --bg-gradient: radial-gradient(circle at 50% 0%, #ffffff 0%, #f8fafc 100%);
  --surface: #ffffff;
  --surface-subtle: #f8fafc;
  --surface-hover: #f1f5f9;
  --border: #e2e8f0;
  --border-subtle: #f1f5f9;
  --border-focus: #2563eb;
  --text: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --primary: #0f172a;
  --primary-hover: #1e293b;
  --accent-blue: #2563eb;
  --accent-blue-hover: #1d4ed8;
  --accent-indigo: #4f46e5;
  
  --radius-lg: 14px;
  --radius: 10px;
  --radius-sm: 7px;
  
  --shadow-xs: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.08), 0 1px 2px -1px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px -1px rgba(15, 23, 42, 0.08), 0 2px 6px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 28px -4px rgba(15, 23, 42, 0.12), 0 6px 12px -4px rgba(15, 23, 42, 0.06);
  --shadow-focus: 0 0 0 3px rgba(37, 99, 235, 0.16);
}

[data-theme="dark"] {
  --bg: #090d16;
  --bg-gradient: radial-gradient(circle at 50% 0%, #131b2e 0%, #090d16 100%);
  --surface: #111827;
  --surface-subtle: #162032;
  --surface-hover: #1e293b;
  --border: #243046;
  --border-subtle: #1a2436;
  --border-focus: #3b82f6;
  --text: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  
  --primary: #f8fafc;
  --primary-hover: #e2e8f0;
  --accent-blue: #3b82f6;
  --accent-blue-hover: #2563eb;
  --accent-indigo: #6366f1;
  
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.5), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 14px -1px rgba(0, 0, 0, 0.6), 0 2px 6px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px -4px rgba(0, 0, 0, 0.7);
  --shadow-focus: 0 0 0 3px rgba(59, 130, 246, 0.35);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text);
  min-height: 100vh;
  padding: 2.25rem 1.25rem 4rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.wrapper {
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Header */
.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding: 1.1rem 1.35rem;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(226, 232, 240, 0.8);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

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

.brand-logo {
  width: 50px;
  height: 50px;
  object-fit: contain;
  filter: drop-shadow(0 3px 8px rgba(15, 23, 42, 0.12));
  flex-shrink: 0;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.brand-logo:hover {
  transform: scale(1.08) rotate(-1deg);
}

.top-bar h1 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text);
  line-height: 1.2;
}

.subtitle {
  font-size: 0.825rem;
  font-weight: 450;
  color: var(--text-muted);
  margin-top: 0.15rem;
  letter-spacing: -0.01em;
}

.header-actions {
  display: flex;
  gap: 0.55rem;
  align-items: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  font-family: inherit;
  font-size: 0.825rem;
  font-weight: 600;
  padding: 0.55rem 0.95rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  text-decoration: none;
  user-select: none;
  white-space: nowrap;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-primary {
  background: linear-gradient(135deg, #1e40af 0%, #2563eb 100%);
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
  background: #94a3b8;
}

.btn-dark {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.2);
}

.btn-dark:hover:not(:disabled) {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.25);
  transform: translateY(-1px);
}

.btn-dark:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
  background: #94a3b8;
}

.btn-outline {
  background-color: var(--surface);
  color: var(--text-secondary);
  border-color: var(--border);
  box-shadow: var(--shadow-xs);
}

.btn-outline:hover {
  background-color: var(--surface-hover);
  color: var(--text);
  border-color: #cbd5e1;
}

/* Main Options Grid */
.mode-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 768px) {
  .mode-options-grid {
    grid-template-columns: 1fr;
  }
}

.mode-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border: 2px dashed #cbd5e1;
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.5rem 1.6rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
  user-select: none;
}

.mode-card:hover {
  border-color: var(--border-focus);
  background: linear-gradient(180deg, #f0f7ff 0%, #ffffff 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.manual-entry-card {
  border: 2px solid #e2e8f0;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.manual-entry-card:hover {
  border-color: #3b82f6;
  background: linear-gradient(180deg, #eff6ff 0%, #ffffff 100%);
}

.mode-badge {
  position: absolute;
  top: 0.85rem;
  left: 0.85rem;
  font-size: 0.685rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  background: #eff6ff;
  color: #2563eb;
  padding: 0.22rem 0.6rem;
  border-radius: 9999px;
  border: 1px solid #bfdbfe;
}

.manual-badge {
  background: #fef3c7;
  color: #b45309;
  border-color: #fde68a;
}

.drop-icon {
  font-size: 2.35rem;
  margin-bottom: 0.4rem;
  transition: transform 0.2s ease;
}

.mode-card:hover .drop-icon {
  transform: scale(1.1);
}

.drop-title {
  font-size: 1.025rem;
  font-weight: 650;
  color: var(--text);
  letter-spacing: -0.015em;
}

.drop-sub {
  font-size: 0.815rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
  line-height: 1.4;
}

.drop-zone input {
  display: none;
}

/* Status Bar */
.status-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border: 1px solid #bfdbfe;
  color: #1d4ed8;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  animation: pulseLight 2s infinite ease-in-out;
}

@keyframes pulseLight {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.88; }
}

.spinner {
  width: 17px;
  height: 17px;
  border: 2.5px solid rgba(37, 99, 235, 0.25);
  border-top-color: #2563eb;
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  flex-shrink: 0;
}

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

/* Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.35rem;
  animation: fadeInGrid 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

@media (max-width: 768px) {
  .results-grid {
    grid-template-columns: 1fr;
  }
}

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

.data-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.35rem 1.4rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.data-card:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-md);
}

.data-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.015em;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.field-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.property-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 0.95rem;
}

.field-item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.lbl {
  font-size: 0.725rem;
  font-weight: 650;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.035em;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.58rem 0.8rem;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  outline: none;
  transition: all 0.18s ease;
  box-shadow: var(--shadow-xs);
}

input[type="text"]:focus,
input[type="password"]:focus {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-focus);
  background: #ffffff;
}

input[type="text"]::placeholder,
input[type="password"]::placeholder {
  color: var(--text-light);
  font-weight: 400;
}

.highlight {
  animation: flash 0.8s ease;
}

@keyframes flash {
  0% { background-color: #dcfce7; border-color: #86efac; }
  100% { background-color: #ffffff; border-color: var(--border); }
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1.25rem;
  animation: modalFadeIn 0.2s ease;
}

@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.modal-card {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius-lg);
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(226, 232, 240, 0.9);
  overflow: hidden;
  animation: modalSlideUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideUp {
  from { transform: translateY(12px) scale(0.98); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}

.modal-header {
  padding: 1.1rem 1.35rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #ffffff;
}

.modal-header h3 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.btn-close {
  background: transparent;
  border: none;
  font-size: 1.35rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 6px;
  padding: 0.2rem 0.4rem;
  transition: all 0.15s ease;
}

.btn-close:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.modal-body {
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.modal-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.field-help {
  font-size: 0.775rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.test-feedback {
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.815rem;
  font-weight: 550;
  line-height: 1.4;
}

.test-feedback.success {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: #166534;
}

.test-feedback.error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
}

.test-feedback.info {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1d4ed8;
}

.modal-footer {
  padding: 0.95rem 1.35rem;
  background: var(--surface-subtle);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.link-btn {
  font-size: 0.815rem;
  color: var(--accent-blue);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.15s ease;
}

.link-btn:hover {
  color: var(--accent-blue-hover);
  text-decoration: underline;
}

.modal-actions {
  display: flex;
  gap: 0.55rem;
}

/* Notice Banner */
.notice-banner {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
  border: 1px solid #fde68a;
  color: #92400e;
  padding: 0.95rem 1.15rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  line-height: 1.45;
  box-shadow: var(--shadow-sm);
  animation: fadeInBanner 0.25s ease;
}

@keyframes fadeInBanner {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.notice-icon {
  font-size: 1.35rem;
  flex-shrink: 0;
  line-height: 1;
}

.notice-body {
  flex: 1;
}

.notice-body strong {
  display: block;
  font-weight: 700;
  margin-bottom: 0.2rem;
  color: #78350f;
}

.notice-close {
  background: transparent;
  border: none;
  font-size: 1.35rem;
  line-height: 1;
  color: #b45309;
  cursor: pointer;
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
  transition: all 0.15s;
}

.notice-close:hover {
  color: #451a03;
  background: rgba(180, 83, 9, 0.1);
}

.btn-theme {
  padding: 0.55rem 0.75rem;
  font-size: 1.05rem;
  line-height: 1;
  transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-theme:hover {
  background-color: var(--surface-hover);
  color: var(--text);
  border-color: #cbd5e1;
  transform: translateY(-1px);
}

[data-theme="dark"] .top-bar {
  background: rgba(17, 24, 39, 0.85);
  border-color: rgba(36, 48, 70, 0.85);
}

[data-theme="dark"] .mode-card {
  background: var(--surface);
  border-color: #334155;
}

[data-theme="dark"] .mode-card:hover {
  border-color: var(--border-focus);
  background: linear-gradient(180deg, #162238 0%, #111827 100%);
}

[data-theme="dark"] .manual-entry-card {
  border-color: #334155;
  background: linear-gradient(180deg, #172033 0%, #111827 100%);
}

[data-theme="dark"] .manual-entry-card:hover {
  border-color: #60a5fa;
  background: linear-gradient(180deg, #1e2c47 0%, #111827 100%);
}

[data-theme="dark"] .mode-badge {
  background: rgba(59, 130, 246, 0.18);
  color: #93c5fd;
  border-color: rgba(59, 130, 246, 0.35);
}

[data-theme="dark"] .manual-badge {
  background: rgba(245, 158, 11, 0.18);
  color: #fcd34d;
  border-color: rgba(245, 158, 11, 0.35);
}

[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="password"] {
  background: var(--surface-subtle);
  color: var(--text);
  border-color: var(--border);
}

[data-theme="dark"] input[type="text"]:focus,
[data-theme="dark"] input[type="password"]:focus {
  background: var(--surface);
  border-color: var(--border-focus);
}

[data-theme="dark"] .modal-card {
  background: var(--surface);
  border-color: var(--border);
}

[data-theme="dark"] .modal-header {
  background: var(--surface);
  border-color: var(--border);
}

[data-theme="dark"] .modal-footer {
  background: var(--surface-subtle);
  border-color: var(--border);
}

[data-theme="dark"] .status-bar {
  background: linear-gradient(135deg, #172554 0%, #1e3a8a 100%);
  border-color: #2563eb;
  color: #bfdbfe;
}

[data-theme="dark"] .status-bar .spinner {
  border-color: rgba(147, 197, 253, 0.25);
  border-top-color: #60a5fa;
}

[data-theme="dark"] .notice-banner {
  background: linear-gradient(135deg, #381a04 0%, #451a03 100%);
  border-color: #92400e;
  color: #fef3c7;
}

[data-theme="dark"] .notice-body strong {
  color: #fde68a;
}

[data-theme="dark"] .notice-close {
  color: #fde68a;
}

[data-theme="dark"] .notice-close:hover {
  background: rgba(254, 243, 199, 0.12);
  color: #ffffff;
}

[data-theme="dark"] input.field-error {
  background-color: rgba(239, 68, 68, 0.12) !important;
  border-color: #ef4444 !important;
}

/* Field Validation Error Highlight */
input.field-error {
  border-color: #ef4444 !important;
  background-color: #fef2f2 !important;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.18) !important;
}

input.field-error:focus {
  outline: none !important;
  border-color: #dc2626 !important;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.25) !important;
}

.hidden {
  display: none !important;
}

/* ==========================================================================
   💎 PROFESSIONAL FLOATING VERSION BADGE
   ========================================================================== */
.version-badge {
  position: fixed;
  bottom: 14px;
  right: 16px;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 0.28rem 0.68rem;
  border-radius: 9999px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  z-index: 50;
  user-select: none;
  transition: all 0.2s ease;
  cursor: default;
}

[data-theme="dark"] .version-badge {
  background: rgba(17, 24, 39, 0.88);
  border-color: var(--border);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
  color: var(--text-light);
}

.version-badge:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
  border-color: var(--border-focus);
}

.version-dot {
  width: 6px;
  height: 6px;
  background-color: #10b981;
  border-radius: 50%;
  position: relative;
  flex-shrink: 0;
}

.version-dot::after {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 50%;
  border: 1.5px solid rgba(16, 185, 129, 0.5);
  animation: beaconPulse 2.2s infinite ease-out;
}

@keyframes beaconPulse {
  0% { transform: scale(0.8); opacity: 0.9; }
  100% { transform: scale(2.4); opacity: 0; }
}

.version-label {
  letter-spacing: 0.025em;
  font-weight: 650;
  color: var(--text-secondary);
}

[data-theme="dark"] .version-label {
  color: var(--text-secondary);
}