/* ==========================================================================
   PROFESSIONAL RESET & BASE STYLES
   Mobile-first, accessible, performant
   ========================================================================== */
:root {
  /* CSS Custom Properties for consistency & performance */
  --primary-gold: #C6A75E;
  --gold-hover: #E6C200;
  --dark-bg: #0B0B0F;
  --navbar-bg: #111116;
  --card-bg: #111116;
  --border-light: #1F2937;
  --text-primary: #E5E7EB;
  --text-secondary: #B0B3B8;
  --text-muted: #9CA3AF;
  --shadow-light: rgba(255, 215, 0, 0.08);
  --shadow-hover: rgba(255, 215, 0, 0.18);
  --shadow-focus: rgba(255, 215, 0, 0.4);
  --border-radius: 14px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--dark-bg);
  color: var(--text-primary);
  line-height: 1.6;
  text-align: center;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Typography Scale */
h1 { font-size: clamp(2rem, 5vw, 2.5rem); margin: 0 0 var(--spacing-md); }
h2 { font-size: clamp(1.5rem, 4vw, 1.875rem); margin: var(--spacing-lg) 0 var(--spacing-md); }
h3 { font-size: clamp(1.25rem, 3vw, 1.5rem); margin: var(--spacing-md) 0 var(--spacing-sm); }
p { font-size: clamp(0.875rem, 2.5vw, 1.125rem); margin: 0 0 var(--spacing-sm); }

/* ==========================================================================
   COMPONENTS
   ========================================================================== */

/* Navbar - Sticky & Responsive */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: clamp(1rem, 3vw, 1.125rem) clamp(1.25rem, 5vw, 1.875rem);
  background: var(--navbar-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
}

.logo {
  font-size: clamp(1.125rem, 3vw, 1.375rem);
  font-weight: 800;
  letter-spacing: 0.1875rem;
  color: var(--primary-gold);
  text-decoration: none;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: clamp(1rem, 4vw, 1.5625rem);
  padding: 0;
  margin: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-primary);
  font-size: clamp(0.875rem, 2vw, 0.9375rem);
  font-weight: 500;
  transition: var(--transition);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--spacing-xs);
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--primary-gold);
  outline: none;
  box-shadow: 0 0 0 2px var(--shadow-focus);
}

/* Button Component */
.btn,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: clamp(0.75rem, 2.5vw, 0.875rem) clamp(1.5rem, 4vw, 1.625rem);
  border: 2px solid var(--primary-gold);
  background: transparent;
  color: var(--primary-gold);
  text-decoration: none;
  font-weight: 600;
  font-size: clamp(0.875rem, 2vw, 1rem);
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
  min-height: 44px; /* Touch target */
}

.btn:hover,
.btn:focus,
button:hover,
button:focus {
  background: var(--primary-gold);
  color: var(--dark-bg);
  transform: translateY(-1px);
  outline: none;
  box-shadow: 0 4px 12px var(--shadow-light);
}

.btn:active,
button:active {
  transform: translateY(0);
}

/* Tool Cards */
.tool-card {
  background: var(--card-bg);
  padding: clamp(1.75rem, 5vw, 2.1875rem);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-light);
  box-shadow: 0 8px 32px var(--shadow-light);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-gold), transparent);
}

.tool-card:hover,
.tool-card:focus-within {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px var(--shadow-hover);
}

.tool-card h2 {
  color: var(--primary-gold);
  margin-bottom: var(--spacing-md);
  position: relative;
}

.tool-card h2::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--primary-gold);
}

/* Form Inputs */
.tool-input {
  width: 100%;
  padding: clamp(0.75rem, 2vw, 1rem);
  margin: var(--spacing-sm) 0;
  background: #1a1a1a;
  border: 1px solid #333;
  color: var(--text-primary);
  font-size: clamp(0.875rem, 2.5vw, 1rem);
  border-radius: 8px;
  transition: var(--transition);
}

.tool-input:focus {
  outline: none;
  border-color: var(--primary-gold);
  box-shadow: 0 0 0 3px var(--shadow-focus);
}

/* Result */
#result {
  margin-top: var(--spacing-lg);
  font-size: clamp(1.25rem, 3.5vw, 1.5rem);
  font-weight: 700;
  color: var(--primary-gold);
  padding: var(--spacing-md);
  background: rgba(198, 167, 94, 0.1);
  border-radius: 8px;
  border-left: 4px solid var(--primary-gold);
}

/* ==========================================================================
   LAYOUT SECTIONS
   ========================================================================== */

header {
  padding: clamp(4rem, 12vw, 5.625rem) clamp(1.25rem, 5vw, 1.25rem) clamp(3.75rem, 8vw, 3.75rem);
}

.tools-section {
  padding: clamp(4rem, 10vw, 4.375rem) clamp(1.25rem, 5vw, 1.25rem);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(clamp(16rem, 40vw, 20rem), 1fr));
  gap: clamp(1.875rem, 5vw, 1.875rem);
  max-width: 1200px;
  margin: var(--spacing-xl) auto 0;
}

.tool-explanation,
.tool-faq {
  max-width: 900px;
  margin: clamp(3rem, 8vw, 3.75rem) auto;
  padding: clamp(1.5rem, 6vw, 2.5rem);
  background: var(--navbar-bg);
  border-radius: var(--border-radius);
  box-shadow: 0 10px 40px var(--shadow-light);
  border: 1px solid var(--border-light);
}

.tool-explanation h2,
.tool-faq h2 {
  color: var(--primary-gold);
  border-left: 4px solid var(--primary-gold);
  padding-left: clamp(0.75rem, 2vw, 0.75rem);
  margin-top: 0;
}

.faq-item {
  margin-bottom: var(--spacing-lg);
  text-align: left;
}

.faq-item h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

footer {
  margin-top: clamp(5rem, 12vw, 5rem);
  padding: clamp(1.25rem, 4vw, 1.25rem);
  font-size: 0.875rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-light);
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS
   Mobile-first approach
   ========================================================================== */

/* Tablet */
@media (min-width: 768px) {
  .navbar {
    padding: 1.125rem 1.875rem;
  }
  
  .nav-links {
    gap: 1.5625rem;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .tools-grid {
    grid-template-columns: repeat(auto-fit, minmax(22rem, 1fr));
    gap: 2.5rem;
  }
  
  header {
    padding: 6rem 3.75rem 4rem;
  }
}

/* Large Desktop */
@media (min-width: 1440px) {
  .tools-grid {
    max-width: 1400px;
    grid-template-columns: repeat(auto-fit, minmax(24rem, 1fr));
  }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .tool-card {
    border-width: 0.5px;
  }
}

/* Print Styles */
@media print {
  .navbar, footer { display: none; }
  body { background: white; color: black; }
}

/* Accessibility & Focus Management */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

:focus-visible {
  outline: 2px solid var(--primary-gold);
  outline-offset: 2px;
}

/* Selection Styles */
::selection {
  background: var(--primary-gold);
  color: var(--dark-bg);
}

::-moz-selection {
  background: var(--primary-gold);
  color: var(--dark-bg);
                 }