/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif;
  background: #0B0C10;
  color: #EAEAEA;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; font: inherit; border: none; background: none; color: inherit; }

/* ===== CSS VARIABLES ===== */
:root {
  --c-primary-start: #4A00E0;
  --c-primary-end: #8E2DE2;
  --c-secondary: #00FF87;
  --c-accent: #FF3366;
  --c-bg: #0B0C10;
  --c-surface: #1F2232;
  --c-surface-hover: #2A2D3A;
  --c-text: #EAEAEA;
  --c-text-muted: #A0A0B0;
  --c-border: #2A2D3A;
  --c-overlay: rgba(11,12,16,0.72);
  --gradient-primary: linear-gradient(135deg, #4A00E0, #8E2DE2);
  --gradient-secondary: linear-gradient(135deg, #00FF87, #00E5A0);
  --glass-bg: rgba(31,34,50,0.55);
  --glass-border: rgba(255,255,255,0.08);
  --shadow-glow: 0 0 20px rgba(138,45,226,0.25);
  --shadow-neon: 0 0 12px rgba(0,255,135,0.3);
  --font-heading: 'Segoe UI', 'Exo 2', 'Orbitron', system-ui, sans-serif;
  --font-body: 'Segoe UI', 'Roboto', system-ui, sans-serif;
  --font-data: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --max-width: 1200px;
  --header-h: 80px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.1;
  color: var(--c-text);
}
h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.125rem; }
p, li, .text-body { font-family: var(--font-body); font-weight: 300; line-height: 1.6; color: var(--c-text); }
.text-small { font-size: 0.875rem; line-height: 1.4; color: var(--c-text-muted); }
.text-data { font-family: var(--font-data); font-weight: 400; letter-spacing: 0.02em; }
.text-muted { color: var(--c-text-muted); }

/* ===== SKIP LINK ===== */
.skip-link {
  position: fixed; top: 0; left: 0; z-index: 10000;
  background: var(--gradient-primary); color: #fff;
  padding: var(--space-sm) var(--space-lg);
  border-radius: 0 0 var(--radius-md) 0;
  font-weight: 700; font-size: 0.875rem;
  transform: translateY(-120%);
  transition: transform 0.25s ease;
}
.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid var(--c-secondary);
  outline-offset: 2px;
}

/* ===== SITE HEADER ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 9000;
  height: var(--header-h);
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid var(--glass-border);
  transition: background 0.3s ease;
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
}
/* brand */
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  position: absolute;
  left: 50%; top: 12px;
  transform: translateX(-50%);
  white-space: nowrap;
}
.brand-icon {
  font-size: 1.6rem;
  filter: drop-shadow(0 0 8px rgba(138,45,226,0.6)) drop-shadow(0 0 20px rgba(74,0,224,0.3));
  animation: glow-pulse 3s ease-in-out infinite;
}
@keyframes glow-pulse {
  0%, 100% { filter: drop-shadow(0 0 8px rgba(138,45,226,0.6)) drop-shadow(0 0 20px rgba(74,0,224,0.3)); }
  50% { filter: drop-shadow(0 0 16px rgba(138,45,226,0.9)) drop-shadow(0 0 32px rgba(74,0,224,0.5)); }
}
.brand-name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: 0.08em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 30px rgba(138,45,226,0.3);
}

/* nav toggle (mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px; height: 44px;
  position: absolute; right: var(--space-lg); top: 50%; transform: translateY(-50%);
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}
.nav-toggle:hover { background: var(--c-surface-hover); }
.nav-toggle:focus-visible { outline: 2px solid var(--c-secondary); outline-offset: 2px; }
.toggle-line {
  display: block; width: 24px; height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
/* mobile open state */
[data-open] .toggle-line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
[data-open] .toggle-line:nth-child(2) { opacity: 0; }
[data-open] .toggle-line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* navigation */
.nav-wrap {
  width: 100%;
  margin-top: 36px;
}
.nav-list {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-lg);
}
.nav-link {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  padding: var(--space-xs) var(--space-sm);
  border-bottom: 2px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease, text-shadow 0.25s ease;
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute; bottom: -2px; left: 50%; transform: translateX(-50%);
  width: 0; height: 2px;
  background: var(--gradient-primary);
  transition: width 0.3s ease;
}
.nav-link:hover,
.nav-link:focus-visible {
  color: var(--c-text);
  text-shadow: 0 0 20px rgba(138,45,226,0.3);
}
.nav-link:hover::after,
.nav-link:focus-visible::after { width: 80%; }
.nav-link[aria-current="page"] {
  color: #fff;
  text-shadow: 0 0 20px rgba(138,45,226,0.5);
}
.nav-link[aria-current="page"]::after {
  width: 80%;
  background: var(--gradient-secondary);
  box-shadow: 0 0 12px rgba(0,255,135,0.4);
}

/* ===== PROGRESS BAR ===== */
.progress-bar {
  position: absolute; bottom: 0; left: 0; height: 3px;
  width: 0;
  background: var(--gradient-secondary);
  box-shadow: 0 0 16px rgba(0,255,135,0.5), 0 0 32px rgba(0,255,135,0.2);
  transition: width 0.08s linear;
  border-radius: 0 2px 2px 0;
  pointer-events: none;
}

/* ===== SITE FOOTER ===== */
.site-footer {
  background: #0A0B12;
  border-top: 1px solid var(--c-border);
  padding: var(--space-xl) var(--space-lg) var(--space-lg);
  margin-top: var(--space-xl);
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-lg) var(--space-xl);
  align-items: start;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.footer-brand .brand-icon {
  font-size: 1.4rem;
  filter: drop-shadow(0 0 8px rgba(138,45,226,0.4));
  animation: none;
}
.footer-brand .brand-name {
  font-size: 1.1rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.footer-link {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.9rem;
  color: var(--c-text-muted);
  transition: color 0.2s ease, padding-left 0.2s ease;
  padding-left: 0;
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--c-secondary);
  padding-left: var(--space-xs);
}
.footer-contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  font-size: 0.85rem;
  color: var(--c-text-muted);
}
.footer-icp {
  grid-column: 1 / -1;
  text-align: center;
  font-size: 0.8rem;
  color: var(--c-text-muted);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding-top: var(--space-md);
  border-top: 1px solid var(--c-border);
}
.footer-note {
  font-style: italic;
  opacity: 0.7;
}
.footer-copy {
  grid-column: 1 / -1;
  text-align: center;
  font-size: 0.8rem;
  color: var(--c-text-muted);
  padding-top: var(--space-sm);
}

/* ===== BUTTONS ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  background: var(--gradient-secondary);
  color: #0B0C10;
  border: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}
.btn-primary:hover,
.btn-primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 0 24px rgba(0,255,135,0.35);
}
.btn-primary:focus-visible { outline: 2px solid var(--c-primary-start); outline-offset: 2px; }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--c-text);
  border: 1px solid var(--c-border);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  cursor: pointer;
}
.btn-outline:hover,
.btn-outline:focus-visible {
  border-color: var(--c-primary-end);
  box-shadow: 0 0 16px rgba(138,45,226,0.2);
  background: rgba(138,45,226,0.08);
}
.btn-outline:focus-visible { outline: 2px solid var(--c-primary-end); outline-offset: 2px; }

/* ===== BREADCRUMB ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md) 0;
  font-size: 0.85rem;
  color: var(--c-text-muted);
}
.breadcrumb a {
  color: var(--c-text-muted);
  transition: color 0.2s;
}
.breadcrumb a:hover,
.breadcrumb a:focus-visible { color: var(--c-secondary); }
.breadcrumb .separator {
  color: var(--c-border);
  margin: 0 var(--space-xs);
}
.breadcrumb [aria-current="page"] {
  color: var(--c-text);
  font-weight: 600;
}

/* ===== CONTAINER & SECTION ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}
.section {
  padding: var(--space-xl) 0;
  position: relative;
}
.section::before {
  content: attr(data-number);
  position: absolute; top: 0; right: var(--space-lg);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(3rem, 8vw, 6rem);
  line-height: 1;
  color: rgba(138,45,226,0.08);
  pointer-events: none;
  letter-spacing: -0.04em;
}

/* ===== TAG ===== */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.15em 0.75em;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-secondary);
  border: 1px solid rgba(0,255,135,0.3);
  border-radius: 100px;
  background: rgba(0,255,135,0.06);
}

/* ===== GRID HELPERS ===== */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: var(--space-lg); }
.grid-4 { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: var(--space-lg); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --header-h: 70px; --space-lg: 1.25rem; --space-xl: 2.5rem; }
  .header-inner { flex-direction: row; justify-content: space-between; align-items: center; padding: 0 var(--space-md); }
  .brand { position: static; transform: none; }
  .brand-name { font-size: 1.1rem; }
  .brand-icon { font-size: 1.4rem; }
  .nav-toggle { display: flex; }
  .nav-wrap {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(1.4);
    -webkit-backdrop-filter: blur(20px) saturate(1.4);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--space-md);
    margin-top: 0;
    transform: translateY(-120%);
    opacity: 0;
    transition: transform 0.35s ease, opacity 0.35s ease;
    pointer-events: none;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
  }
  [data-open] .nav-wrap {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-list {
    flex-direction: column;
    gap: var(--space-xs);
  }
  .nav-link {
    font-size: 1rem;
    padding: var(--space-sm) var(--space-md);
    width: 100%;
    text-align: center;
    border-bottom: 1px solid var(--glass-border);
  }
  .nav-link:last-child { border-bottom: none; }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] {
    background: rgba(138,45,226,0.15);
    border-radius: var(--radius-sm);
  }
  .progress-bar { top: auto; bottom: 0; }
  .footer-inner { grid-template-columns: 1fr; text-align: center; gap: var(--space-md); }
  .footer-brand { justify-content: center; }
  .footer-links { align-items: center; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .section::before { right: var(--space-md); }
}

@media (max-width: 480px) {
  :root { --header-h: 62px; --space-lg: 1rem; --space-xl: 2rem; }
  .brand-name { font-size: 1rem; }
  .brand-icon { font-size: 1.2rem; }
  .nav-link { font-size: 0.95rem; }
}

/* ===== ACCESSIBILITY & MOTION ===== */
:focus-visible {
  outline: 2px solid var(--c-secondary);
  outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .brand-icon { animation: none; filter: drop-shadow(0 0 8px rgba(138,45,226,0.4)); }
  .progress-bar { transition: none; }
  .nav-wrap { transition: none; }
  .nav-link::after { transition: none; }
  .btn-primary, .btn-outline { transition: none; }
}

/* ===== UTILITY ===== */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.gradient-text-secondary {
  background: var(--gradient-secondary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.glow-border {
  border: 1px solid transparent;
  border-image: var(--gradient-primary) 1;
}
.glow-border-secondary {
  border: 1px solid transparent;
  border-image: var(--gradient-secondary) 1;
}
.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}