/* Base Styles & Typography */
:root {
  --primary: #4f46e5; /* Indigo 600 */
  --primary-hover: #4338ca; /* Indigo 700 */
  --secondary: #0ea5e9; /* Sky 500 */
  --bg-light: #f8fafc;
  --bg-dark: #0f172a;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #f8fafc;
  --border-light: #e2e8f0;
  --border-dark: #334155;
  --surface-light: #ffffff;
  --surface-dark: #1e293b;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-light);
  -webkit-font-smoothing: antialiased;
  transition: var(--transition);
}

body.dark-mode {
  color: var(--text-light);
  background-color: var(--bg-dark);
}

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
}

body.dark-mode header {
  background-color: rgba(15, 23, 42, 0.8);
  border-bottom-color: var(--border-dark);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4.5rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  text-decoration: none;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.025em;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

nav a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--primary);
}

body.dark-mode nav a {
  color: #94a3b8;
}

body.dark-mode nav a:hover {
  color: #fff;
}

/* Mobile Menu */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-main);
  margin-bottom: 5px;
  transition: var(--transition);
}

body.dark-mode .hamburger span {
  background-color: var(--text-light);
}

.hamburger span:last-child {
  margin-bottom: 0;
}

/* Hero Section */
.hero {
  padding: 6rem 0 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.15) 0%, rgba(255,255,255,0) 70%);
  z-index: -1;
}

body.dark-mode .hero::before {
  background: radial-gradient(circle, rgba(79, 70, 229, 0.2) 0%, rgba(15,23,42,0) 70%);
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin-bottom: 1.5rem;
  color: var(--text-main);
}

body.dark-mode .hero h1 {
  color: #fff;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

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

body.dark-mode .btn-secondary {
  background-color: var(--surface-dark);
  color: var(--text-light);
  border-color: var(--border-dark);
}

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

body.dark-mode .btn-secondary:hover {
  background-color: #334155;
}

/* Tool Section */
.tool-section {
  background-color: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  margin-bottom: 4rem;
  box-shadow: var(--shadow-lg);
  position: relative;
}

body.dark-mode .tool-section {
  background-color: var(--surface-dark);
  border-color: var(--border-dark);
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

input, select, textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background-color: #f8fafc;
  color: var(--text-main);
  transition: var(--transition);
  font-family: inherit;
  outline: none;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

body.dark-mode input, body.dark-mode select, body.dark-mode textarea {
  background-color: #0f172a;
  border-color: var(--border-dark);
  color: var(--text-light);
}

body.dark-mode input:focus, body.dark-mode select:focus, body.dark-mode textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.25);
}

.advanced-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0.5rem 0;
  margin-top: 1rem;
}

/* Results Table */
.results-container {
  margin-top: 2rem;
  background-color: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

body.dark-mode .results-container {
  background-color: var(--surface-dark);
  border-color: var(--border-dark);
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-light);
  background-color: #f8fafc;
}

body.dark-mode .results-header {
  background-color: #0f172a;
  border-bottom-color: var(--border-dark);
}

.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th, td {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

body.dark-mode th, body.dark-mode td {
  border-bottom-color: var(--border-dark);
}

th {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-muted);
  background-color: #f8fafc;
}

body.dark-mode th {
  background-color: rgba(15, 23, 42, 0.5);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background-color: #f1f5f9;
}

body.dark-mode tr:hover td {
  background-color: #1e293b;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-info { background: #e0f2fe; color: #0369a1; }
.badge-comm { background: #f3e8ff; color: #7e22ce; }
.badge-trans { background: #dcfce3; color: #15803d; }
.badge-nav { background: #ffedd5; color: #c2410c; }

body.dark-mode .badge-info { background: rgba(14, 165, 233, 0.2); color: #7dd3fc; }
body.dark-mode .badge-comm { background: rgba(168, 85, 247, 0.2); color: #d8b4fe; }
body.dark-mode .badge-trans { background: rgba(34, 197, 94, 0.2); color: #86efac; }
body.dark-mode .badge-nav { background: rgba(249, 115, 22, 0.2); color: #fdba74; }

/* Features & Stats & Testimonials */
.section-title {
  text-align: center;
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 3rem;
  font-size: 1.125rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.card {
  background-color: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

body.dark-mode .card {
  background-color: var(--surface-dark);
  border-color: var(--border-dark);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-icon {
  width: 48px;
  height: 48px;
  background-color: rgba(79, 70, 229, 0.1);
  color: var(--primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.card p {
  color: var(--text-muted);
}

/* Footer */
footer {
  background-color: var(--surface-light);
  border-top: 1px solid var(--border-light);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

body.dark-mode footer {
  background-color: var(--surface-dark);
  border-top-color: var(--border-dark);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  font-size: 1.125rem;
  margin-bottom: 1.5rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 0.75rem;
}

.footer-col a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
  color: var(--text-muted);
  font-size: 0.875rem;
}

body.dark-mode .footer-bottom {
  border-top-color: var(--border-dark);
}

/* Utilities */
.hidden { display: none !important; }
.text-center { text-align: center; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.w-full { width: 100%; }

.loading {
  text-align: center;
  padding: 4rem;
  color: var(--primary);
  font-weight: 500;
}

/* Content Pages */
.content-page {
  max-width: 800px;
  margin: 4rem auto;
  background-color: var(--surface-light);
  padding: 3rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

body.dark-mode .content-page {
  background-color: var(--surface-dark);
  border-color: var(--border-dark);
}

.content-page h1 { font-size: 2.5rem; margin-bottom: 2rem; }
.content-page h2 { font-size: 1.75rem; margin-top: 2.5rem; margin-bottom: 1rem; }
.content-page p { margin-bottom: 1rem; color: var(--text-muted); }
.content-page ul { margin-bottom: 1rem; padding-left: 1.5rem; color: var(--text-muted); }

/* Responsive */
@media (max-width: 768px) {
  .hamburger {
    display: block;
  }
  
  nav ul {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--surface-light);
    flex-direction: column;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
  }
  
  body.dark-mode nav ul {
    background-color: var(--surface-dark);
    border-bottom-color: var(--border-dark);
  }
  
  nav ul.active {
    display: flex;
  }
  
  .results-header {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
}