/* =====================================================
   CodeTigrinya (ኮድ ትግርኛ) - Design System
   Dark Terminal Theme with Electric Green Accent
   ===================================================== */

/* ===== IMPORTS ===== */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap");

/* ===== CSS VARIABLES ===== */
:root {
  /* Colors */
  --bg-primary: #050505;
  --bg-secondary: #0a0a0a;
  --bg-card: #0f0f0f;
  --bg-elevated: #141414;
  --accent: #00ff88;
  --accent-dim: #00cc6a;
  --accent-glow: rgba(0, 255, 136, 0.3);
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;
  --border-color: #1a1a1a;
  --success: #00ff88;
  --warning: #ffaa00;
  --error: #ff4444;
  --info: #00aaff;

  /* Typography */
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Shadows */
  --shadow-glow: 0 0 20px var(--accent-glow);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.5);
}

/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Noise Overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  opacity: 0.03;
  pointer-events: none;
  z-index: 9999;
}

/* Scanline Effect */
body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.1) 2px,
    rgba(0, 0, 0, 0.1) 4px
  );
  pointer-events: none;
  z-index: 9998;
  opacity: 0.4;
}

/* ===== TYPOGRAPHY ===== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-mono);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}
h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
}
h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}
h4 {
  font-size: 1.25rem;
}

p {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

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

a:hover {
  color: var(--text-primary);
  text-shadow: 0 0 10px var(--accent-glow);
}

code,
.mono {
  font-family: var(--font-mono);
}

/* ===== LAYOUT ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) 0;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--accent-glow), 0 10px 40px rgba(0, 255, 136, 0.2);
}

.btn-secondary {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}

.btn-secondary:hover {
  background: var(--accent);
  color: var(--bg-primary);
}

/* Button Glow Pulse */
.btn-primary::before {
  content: "";
  position: absolute;
  inset: -2px;
  background: linear-gradient(45deg, var(--accent), transparent, var(--accent));
  border-radius: inherit;
  z-index: -1;
  animation: btnGlow 2s linear infinite;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.btn-primary:hover::before {
  opacity: 1;
}

@keyframes btnGlow {
  0%,
  100% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* ===== CARDS ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: var(--transition-base);
  position: relative;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--accent-glow), transparent);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: var(--accent-dim);
}

.card:hover::before {
  opacity: 1;
}

/* ===== NAVIGATION ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(5, 5, 5, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-logo span {
  color: var(--text-primary);
}

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

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--accent);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-link.active {
  color: var(--accent);
}

.nav-link.active::after {
  width: 100%;
}

/* Language Toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-xs);
}

.lang-btn {
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.lang-btn.active {
  background: var(--accent);
  color: var(--bg-primary);
}

/* Mobile Menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition-fast);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-secondary);
    padding: var(--space-lg);
    gap: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
  }

  .nav-links.open {
    display: flex;
  }
}

/* ===== FORMS ===== */
.input {
  width: 100%;
  padding: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: var(--transition-fast);
}

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

.input::placeholder {
  color: var(--text-muted);
}

/* ===== BADGES ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
}

.badge-beginner {
  color: var(--success);
  border-color: var(--success);
}

.badge-intermediate {
  color: var(--warning);
  border-color: var(--warning);
}

.badge-advanced {
  color: var(--error);
  border-color: var(--error);
}

/* ===== PROGRESS BAR ===== */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
  border-radius: inherit;
  transition: width var(--transition-slow);
  position: relative;
}

.progress-fill::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

/* ===== CODE BLOCK ===== */
.code-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.code-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-color);
}

.code-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.code-dot.red {
  background: #ff5f56;
}
.code-dot.yellow {
  background: #ffbd2e;
}
.code-dot.green {
  background: #27c93f;
}

.code-content {
  padding: var(--space-lg);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.8;
  overflow-x: auto;
}

.code-line {
  display: flex;
  gap: var(--space-md);
}

.code-line-number {
  color: var(--text-muted);
  user-select: none;
  min-width: 2ch;
}

.code-keyword {
  color: #ff79c6;
}
.code-string {
  color: #f1fa8c;
}
.code-function {
  color: var(--accent);
}
.code-comment {
  color: var(--text-muted);
  font-style: italic;
}

/* ===== GRID ===== */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}
.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* ===== UTILITIES ===== */
.text-center {
  text-align: center;
}
.text-accent {
  color: var(--accent);
}
.text-muted {
  color: var(--text-muted);
}
.font-mono {
  font-family: var(--font-mono);
}

.mb-sm {
  margin-bottom: var(--space-sm);
}
.mb-md {
  margin-bottom: var(--space-md);
}
.mb-lg {
  margin-bottom: var(--space-lg);
}
.mb-xl {
  margin-bottom: var(--space-xl);
}
.mb-2xl {
  margin-bottom: var(--space-2xl);
}

.mt-sm {
  margin-top: var(--space-sm);
}
.mt-md {
  margin-top: var(--space-md);
}
.mt-lg {
  margin-top: var(--space-lg);
}
.mt-xl {
  margin-top: var(--space-xl);
}

.hidden {
  display: none !important;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  :root {
    --space-lg: 1rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
    --space-3xl: 2.5rem;
  }

  .section {
    padding: var(--space-2xl) 0;
  }
}