/* ============================================
   VelociBar — Styles
   Minimal, performant, accessible
   ============================================ */

/* --- CSS Variables --- */
:root {
  /* Colors — Deep teal/cyan palette */
  --color-bg: #0a0f14;
  --color-bg-alt: #0f1820;
  --color-surface: #141f2a;
  --color-border: rgba(56, 189, 195, 0.15);
  
  --color-text: #e8f0f2;
  --color-text-muted: #8aa3ad;
  --color-text-subtle: #5a7580;
  
  --color-accent: #38bdc3;
  --color-accent-hover: #4dd4db;
  --color-accent-glow: rgba(56, 189, 195, 0.25);
  
  --color-success: #38c378;
  
  /* Typography */
  --font-stack: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 
                system-ui, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, ui-monospace, Menlo, Monaco, 
               'Cascadia Mono', Consolas, monospace;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  
  /* Layout */
  --max-width: 960px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-stack);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
}

/* Atmospheric background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--color-accent-glow), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(56, 189, 195, 0.08), transparent),
    radial-gradient(ellipse 50% 30% at 0% 80%, rgba(56, 195, 150, 0.06), transparent);
  pointer-events: none;
  z-index: -1;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
}

h1 em {
  font-style: normal;
  color: var(--color-accent);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: var(--space-xl);
  text-align: center;
}

h3 {
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* --- Layout --- */
.section {
  padding: var(--space-3xl) var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-alt {
  background: var(--color-bg-alt);
  max-width: 100%;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

.section-alt > *:not(.faq-list):not(.evidence-content) {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

/* --- Header / Nav --- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 15, 20, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
  gap: var(--space-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-text);
}

.logo:hover {
  color: var(--color-text);
}

.logo-icon {
  color: var(--color-accent);
  font-size: 1.25rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--color-text);
}

/* --- Hero --- */
.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg);
  min-height: calc(100vh - 200px);
}

@media (min-width: 768px) {
  .hero {
    grid-template-columns: 1.2fr 1fr;
    min-height: auto;
    padding-top: var(--space-3xl);
    padding-bottom: var(--space-3xl);
  }
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  width: fit-content;
  padding: var(--space-xs) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.01em;
}

.pill::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-subtitle {
  font-size: 1.125rem;
  max-width: 520px;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
  box-shadow: 0 0 20px var(--color-accent-glow);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 24px var(--color-accent-glow);
}

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

.btn-secondary:hover {
  background: var(--color-surface);
  border-color: var(--color-text-subtle);
  color: var(--color-text);
}

.btn-large {
  padding: var(--space-lg) var(--space-2xl);
  font-size: 1.125rem;
}

.btn-icon {
  font-size: 1.2em;
}

/* --- Hero Visual --- */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.menu-bar-preview {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-xl);
  background: linear-gradient(135deg, var(--color-surface) 0%, rgba(20, 31, 42, 0.8) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 
    0 4px 24px rgba(0, 0, 0, 0.3),
    0 0 60px var(--color-accent-glow);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.menu-bar-dot {
  width: 12px;
  height: 12px;
  background: var(--color-success);
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(56, 195, 120, 0.5);
}

.menu-bar-content {
  display: flex;
  align-items: baseline;
  gap: var(--space-xs);
}

.speed-value {
  font-size: 2.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.speed-unit {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

/* --- Features --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
}

.feature-card {
  padding: var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 195, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
  filter: grayscale(0);
}

.feature-card h3 {
  color: var(--color-text);
}

/* --- Evidence --- */
.evidence-content {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.evidence-content > p {
  max-width: 680px;
  margin: 0 auto var(--space-xl);
  font-size: 1.0625rem;
}

.csv-preview {
  display: inline-block;
  padding: var(--space-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: left;
}

.csv-preview code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* --- Privacy --- */
.privacy-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  max-width: 600px;
  margin: 0 auto;
}

.privacy-list li {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.privacy-list .check {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(56, 195, 120, 0.15);
  color: var(--color-success);
  border-radius: 50%;
  font-size: 0.875rem;
  font-weight: 700;
}

.privacy-list strong {
  display: block;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.privacy-list p {
  font-size: 0.9375rem;
  margin: 0;
}

/* --- FAQ --- */
.faq-list {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.faq-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-item summary {
  padding: var(--space-lg);
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  transition: background var(--transition-fast);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--color-accent);
  transition: transform var(--transition-base);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item summary:hover {
  background: var(--color-surface);
}

.faq-item summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.faq-item p {
  padding: 0 var(--space-lg) var(--space-lg);
  margin: 0;
}

/* --- CTA Section --- */
.cta-section {
  text-align: center;
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-3xl);
}

.cta-section p {
  font-size: 1.125rem;
  margin-bottom: var(--space-xl);
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) var(--space-lg);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  color: var(--color-text);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-lg);
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

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

.copyright {
  font-size: 0.875rem;
  color: var(--color-text-subtle);
}

/* --- Toast --- */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: var(--space-md) var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-weight: 500;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 200;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  visibility: visible;
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .nav {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .nav-links {
    gap: var(--space-md);
  }
  
  .cta-group {
    flex-direction: column;
  }
  
  .cta-group .btn {
    width: 100%;
  }
  
  .section {
    padding: var(--space-2xl) var(--space-md);
  }
  
  .menu-bar-preview {
    padding: var(--space-md) var(--space-lg);
  }
  
  .speed-value {
    font-size: 2rem;
  }
}