/* KeyRush Global Reset, Typography, Layout, and Design System */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&family=Fira+Code:wght@400;500;600&family=Space+Mono:wght@400;700&display=swap');

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

body {
  font-family: var(--kr-font-ui);
  background-color: var(--kr-bg-main);
  color: var(--kr-text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color 0.25s ease, color 0.25s ease;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}
::-webkit-scrollbar-track {
  background: var(--kr-bg-main);
}
::-webkit-scrollbar-thumb {
  background: var(--kr-border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--kr-border-highlight);
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.text-accent {
  color: var(--kr-accent-primary) !important;
}

.text-cyan {
  color: var(--kr-accent-secondary) !important;
}

.text-muted {
  color: var(--kr-text-muted) !important;
}

.text-success {
  color: var(--kr-success) !important;
}

.text-danger {
  color: var(--kr-danger) !important;
}

.text-xs {
  font-size: 0.75rem;
}

.font-mono {
  font-family: var(--kr-font-typing);
}

.font-bold {
  font-weight: 700;
}

/* Navigation Header */
.kr-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(9, 10, 16, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--kr-border);
  height: 64px;
  display: flex;
  align-items: center;
}

.kr-nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.kr-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  text-decoration: none;
}

.kr-logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--kr-accent-primary), var(--kr-accent-secondary));
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.15rem;
  color: #fff;
  box-shadow: 0 0 16px var(--kr-accent-glow);
  transition: transform 0.2s ease;
}

.kr-brand:hover .kr-logo-icon {
  transform: scale(1.05) rotate(2deg);
}

.kr-brand-title {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(120deg, #ffffff, var(--kr-accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.kr-nav-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
}

.kr-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--kr-text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.18s ease;
}

.kr-nav-btn:hover {
  color: var(--kr-text-main);
  background: var(--kr-bg-subtle);
}

.kr-nav-link-active {
  color: var(--kr-text-main) !important;
  background: var(--kr-bg-surface-elevated) !important;
  border: 1px solid var(--kr-border-highlight);
  box-shadow: 0 0 12px var(--kr-accent-glow);
}

.kr-header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.kr-icon-btn {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--kr-bg-surface);
  border: 1px solid var(--kr-border);
  color: var(--kr-text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.kr-icon-btn:hover {
  color: var(--kr-text-main);
  border-color: var(--kr-border-highlight);
  background: var(--kr-bg-surface-elevated);
}

.kr-user-profile-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.8rem;
  background: var(--kr-bg-surface);
  border: 1px solid var(--kr-border);
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.kr-user-profile-badge:hover {
  border-color: var(--kr-border-highlight);
  box-shadow: 0 0 10px var(--kr-accent-glow);
}

.kr-avatar-icon {
  font-size: 1.1rem;
}

.kr-username-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--kr-text-main);
}

/* Mobile hamburger button */
.kr-mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--kr-text-main);
  font-size: 1.4rem;
  cursor: pointer;
}

.kr-mobile-menu {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  background: var(--kr-bg-surface);
  border-bottom: 1px solid var(--kr-border);
}

/* Main Viewport Container */
.kr-main-viewport {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem 1.5rem;
  display: flex;
  flex-direction: column;
}

/* Hero Section */
.kr-hero-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  background: radial-gradient(circle at 10% 20%, rgba(168, 85, 247, 0.12), transparent 45%),
              linear-gradient(145deg, var(--kr-bg-surface), rgba(13, 15, 23, 0.7));
  border: 1px solid var(--kr-border);
  border-radius: 20px;
  padding: 2.25rem 2.5rem;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.kr-hero-content {
  max-width: 580px;
}

.kr-hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--kr-accent-secondary);
  background: rgba(6, 182, 212, 0.1);
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
  border: 1px solid rgba(6, 182, 212, 0.25);
  margin-bottom: 1rem;
}

.kr-hero-title {
  font-size: 2.75rem;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 0.85rem;
}

.kr-hero-desc {
  font-size: 1.05rem;
  color: var(--kr-text-muted);
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.kr-hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.kr-hero-img-wrap {
  width: 320px;
  height: 200px;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--kr-border);
  box-shadow: 0 0 25px var(--kr-accent-glow);
  flex-shrink: 0;
}

.kr-hero-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.kr-hero-img-wrap:hover img {
  transform: scale(1.05);
}

/* Feature Cards Grid */
.kr-features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.kr-feature-card {
  background: var(--kr-bg-surface);
  border: 1px solid var(--kr-border);
  border-radius: 14px;
  padding: 1.25rem 1.4rem;
  transition: all 0.2s ease;
}

.kr-feature-card:hover {
  transform: translateY(-2px);
  border-color: var(--kr-border-highlight);
  box-shadow: 0 6px 20px var(--kr-accent-glow);
}

.kr-feature-icon {
  font-size: 1.6rem;
  margin-bottom: 0.5rem;
}

.kr-feature-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
  color: var(--kr-text-main);
}

.kr-feature-desc {
  font-size: 0.825rem;
  color: var(--kr-text-muted);
  line-height: 1.4;
}

/* Test Config Toolbar */
.kr-test-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem 1.5rem;
  background: var(--kr-bg-surface);
  border: 1px solid var(--kr-border);
  border-radius: 16px;
  padding: 0.6rem 1.25rem;
  margin: 0 auto 2.5rem auto;
  width: fit-content;
  max-width: 100%;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.kr-toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.kr-toolbar-divider {
  width: 1px;
  height: 20px;
  background: var(--kr-border);
}

.kr-mode-btn, .kr-sub-btn, .kr-diff-btn {
  background: transparent;
  border: none;
  color: var(--kr-text-muted);
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.kr-mode-btn:hover, .kr-sub-btn:hover, .kr-diff-btn:hover {
  color: var(--kr-text-main);
}

.kr-mode-btn.active, .kr-sub-btn.active, .kr-diff-btn.active {
  color: var(--kr-accent-primary);
  background: var(--kr-bg-surface-elevated);
  box-shadow: 0 0 8px var(--kr-accent-glow);
}

/* Footer */
.kr-footer {
  margin-top: auto;
  border-top: 1px solid var(--kr-border);
  padding: 1.5rem 0;
  font-size: 0.85rem;
  color: var(--kr-text-muted);
}

.kr-footer-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.kr-footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.kr-footer-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
}

.kr-footer-links a {
  color: var(--kr-text-muted);
  text-decoration: none;
  transition: color 0.15s;
}

.kr-footer-links a:hover {
  color: var(--kr-accent-primary);
}

/* Responsive Media Queries */
@media (max-width: 900px) {
  .kr-hero-banner {
    flex-direction: column;
    text-align: center;
    padding: 2rem 1.5rem;
  }
  .kr-hero-content {
    max-width: 100%;
  }
  .kr-hero-actions {
    justify-content: center;
  }
  .kr-hero-img-wrap {
    width: 100%;
    max-width: 420px;
    height: 180px;
  }
  .kr-nav-links {
    display: none;
  }
  .kr-mobile-toggle {
    display: block;
  }
}