:root {
  --bg-main: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;
  --border-color: #e2e8f0;
  --border-focus: #f97316;
  --primary: #ea580c;
  --primary-hover: #c2410c;
  --primary-light: #ffedd5;
  --accent: #f97316;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  --success: #16a34a;
  --success-light: #dcfce7;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header & Nav */
.header {
  border-bottom: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-size: 1.35rem;
  font-weight: 800;
  color: #0f172a;
  letter-spacing: -0.02em;
}

.brand-badge {
  background: linear-gradient(135deg, #f97316, #ea580c);
  color: white;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: color 0.2s;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, #f97316, #ea580c);
  color: #fff;
  box-shadow: 0 4px 14px rgba(234, 88, 12, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #ea580c, #c2410c);
  box-shadow: 0 6px 20px rgba(234, 88, 12, 0.5);
  transform: translateY(-1px);
}

.btn-secondary {
  background: #ffffff;
  border-color: var(--border-color);
  color: var(--text-main);
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.btn-secondary:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

.btn-orange-outline {
  background: #fff;
  border: 1.5px solid #f97316;
  color: #ea580c;
}

.btn-orange-outline:hover {
  background: #fff7ed;
}

.btn-danger {
  background: #fee2e2;
  color: #b91c1c;
  border-color: #fca5a5;
}

.btn-danger:hover {
  background: #dc2626;
  color: white;
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

/* Layout Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  flex: 1;
  width: 100%;
}

/* Cards & Surface */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
}

/* Form Controls */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.8rem 1rem;
  background: #ffffff;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.2);
}

/* Big Hero URL Shortener */
.hero-section {
  text-align: center;
  padding: 3rem 1rem 2rem;
  max-width: 840px;
  margin: 0 auto;
}

.hero-kicker {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #ea580c;
  background: #ffedd5;
  padding: 0.35rem 0.95rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
  color: #0f172a;
}

.hero-title span {
  background: linear-gradient(135deg, #f97316, #c2410c);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

/* Shortener Input Box */
.shortener-box {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: 0 10px 30px -5px rgba(234, 88, 12, 0.08);
  text-align: left;
}

.shortener-main-row {
  display: flex;
  gap: 0.75rem;
}

.shortener-input {
  flex: 1;
  font-size: 1.1rem;
  padding: 0.95rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1.5px solid #cbd5e1;
  background: #ffffff;
  color: #0f172a;
  outline: none;
}

.shortener-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.2);
}

.advanced-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: #ea580c;
  cursor: pointer;
  user-select: none;
}

.advanced-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
}

/* Result Box */
.result-card {
  margin-top: 1.75rem;
  background: #fff7ed;
  border: 1.5px solid #fdba74;
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  animation: fadeIn 0.3s ease;
}

.result-row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.result-label {
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #c2410c;
}

.result-input-group {
  display: flex;
  gap: 0.5rem;
}

.result-input {
  flex: 1;
  background: #ffffff;
  border: 1.5px solid #fed7aa;
  color: #ea580c;
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  font-family: monospace;
  font-size: 1rem;
  font-weight: 600;
}

/* Stat Grid */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin: 3rem 0;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.stat-value {
  font-size: 2.25rem;
  font-weight: 800;
  color: #ea580c;
  letter-spacing: -0.03em;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-top: 0.25rem;
}

/* Data Tables */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: #ffffff;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.data-table th {
  background: #f8fafc;
  padding: 0.85rem 1rem;
  font-weight: 700;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
}

.data-table td {
  padding: 1rem;
  border-bottom: 1px solid #f1f5f9;
  color: var(--text-main);
  vertical-align: middle;
}

.data-table tr:hover {
  background: #f8fafc;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
}

.badge-orange { background: #ffedd5; color: #ea580c; }
.badge-success { background: #dcfce7; color: #15803d; }
.badge-warning { background: #fef3c7; color: #b45309; }
.badge-danger { background: #fee2e2; color: #b91c1c; }
.badge-indigo { background: #e0e7ff; color: #4338ca; }

/* Alerts */
.alert-error {
  background: #fee2e2;
  border: 1.5px solid #fca5a5;
  color: #991b1b;
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
}

.alert-success {
  background: #dcfce7;
  border: 1.5px solid #86efac;
  color: #166534;
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-content {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 650px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 2rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  color: #0f172a;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.75rem;
  cursor: pointer;
}

.modal-close:hover {
  color: #0f172a;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: 1.5rem;
  overflow-x: auto;
}

.tab-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 0.85rem 1.35rem;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
  white-space: nowrap;
}

.tab-btn:hover {
  color: #ea580c;
}

.tab-btn.active {
  color: #ea580c;
  border-bottom-color: #ea580c;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  background: #ffffff;
  padding: 2.25rem 1.5rem;
  margin-top: auto;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.75rem;
  margin-bottom: 0.85rem;
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 600;
}

.footer-link:hover {
  color: var(--primary);
}

.hidden {
  display: none !important;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 640px) {
  .hero-title { font-size: 2.35rem; }
  .shortener-main-row { flex-direction: column; }
  .nav-links { gap: 0.75rem; }
}