/* ============================================
   ARGUS � Dark Terminal-Inspired Theme
   ============================================ */

:root {
  --bg-root: #0a0a0a;
  --bg-surface: #111111;
  --bg-elevated: #1a1a1a;
  --bg-inset: #0d0d0d;
  --border-subtle: #222222;
  --border-default: #2a2a2a;
  --border-strong: #333333;
  --text-primary: #e6e6e6;
  --text-secondary: #999999;
  --text-muted: #666666;
  --accent-primary: #00ff88;
  --accent-secondary: #00d4ff;
  --accent-dim: rgba(0, 255, 136, 0.12);
  --accent-glow: rgba(0, 255, 136, 0.25);
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --max-width: 1200px;
  --nav-height: 64px;
}

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

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

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

a {
  color: inherit;
  text-decoration: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

@media (min-width: 768px) {
  .container {
    padding: 0 40px;
  }
}

/* ============================================
   Navbar
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

@media (min-width: 768px) {
  .navbar .container {
    padding: 0 40px;
  }
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.5px;
  z-index: 101;
}

.logo-icon {
  width: 26px;
  height: 26px;
  color: var(--accent-primary);
}

.logo-text {
  font-family: var(--font-mono);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  position: relative;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--text-primary);
  outline: none;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-primary);
  transition: width 0.25s ease;
}

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

.nav-link--external::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 6px;
  border-radius: 50%;
  background: var(--accent-primary);
  opacity: 0.6;
  vertical-align: middle;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 101;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 767px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 260px;
    height: 100vh;
    background: var(--bg-surface);
    border-left: 1px solid var(--border-subtle);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: calc(var(--nav-height) + 24px) 24px 24px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    box-shadow: -8px 0 30px rgba(0, 0, 0, 0.5);
  }

  .nav-menu.is-open {
    transform: translateX(0);
  }

  .nav-link {
    display: block;
    padding: 14px 0;
    font-size: 16px;
    border-bottom: 1px solid var(--border-subtle);
    width: 100%;
  }

  .nav-link::after {
    display: none;
  }
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-height) + 40px) 24px 60px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse at center, var(--accent-dim) 0%, transparent 70%);
  filter: blur(80px);
  opacity: 0.6;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 720px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid var(--border-default);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-surface);
  margin-bottom: 24px;
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-glow);
  animation: pulse-dot 2s ease-in-out infinite;
}

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

.hero-title {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.hero-title-main {
  font-family: var(--font-mono);
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -2px;
  color: var(--text-primary);
}

.hero-title-sub {
  font-size: clamp(18px, 3vw, 24px);
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: -0.3px;
}

.hero-desc {
  font-size: clamp(16px, 2vw, 18px);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-bottom: 28px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.hero-meta-sep {
  color: var(--border-default);
}

@media (min-width: 768px) {
  .hero {
    padding: calc(var(--nav-height) + 60px) 24px 80px;
  }
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}

.btn-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--accent-primary);
  color: #0a0a0a;
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 30px var(--accent-glow), 0 4px 12px rgba(0, 0, 0, 0.3);
}

.btn-primary:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
}

.btn-secondary:hover {
  background: var(--border-subtle);
  transform: translateY(-1px);
}

.btn-secondary:focus-visible {
  outline: 2px solid var(--text-secondary);
  outline-offset: 3px;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 17px;
}

@media (max-width: 767px) {
  .btn {
    padding: 12px 20px;
    font-size: 14px;
    width: 100%;
    justify-content: center;
  }

  .btn-lg {
    padding: 14px 24px;
    font-size: 16px;
  }
}

/* ============================================
   Terminal Visual
   ============================================ */
.hero-visual {
  display: none;
  margin-top: 48px;
}

@media (min-width: 1024px) {
  .hero-visual {
    display: block;
  }
}

.terminal-window {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 40px var(--accent-dim);
  max-width: 520px;
  margin: 0 auto;
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

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

.terminal-title {
  margin-left: 8px;
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.terminal-body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  background: var(--bg-inset);
}

.terminal-line {
  display: flex;
  gap: 8px;
}

.terminal-prompt {
  color: var(--accent-primary);
  user-select: none;
}

.terminal-line--muted {
  color: var(--text-muted);
}

.terminal-line--accent {
  color: var(--accent-secondary);
}

.terminal-line--success {
  color: var(--accent-primary);
}

.terminal-cursor {
  display: inline-block;
  width: 8px;
  height: 16px;
  background: var(--accent-primary);
  margin-left: 4px;
  animation: blink 1s step-end infinite;
}

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

@media (prefers-reduced-motion: reduce) {
  .hero-badge-dot,
  .terminal-cursor {
    animation: none;
  }
  html {
    scroll-behavior: auto;
  }
}

/* ============================================
   Section Styles
   ============================================ */
section {
  padding: 80px 0;
  border-top: 1px solid var(--border-subtle);
}

.section-title {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 48px;
  max-width: 480px;
}

/* ============================================
   Features
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.feature-card:hover {
  border-color: var(--border-default);
  transform: translateY(-2px);
}

.feature-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 16px;
  color: var(--accent-primary);
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   How It Works
   ============================================ */
.how-it-works {
  background: var(--bg-inset);
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

@media (min-width: 768px) {
  .steps {
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
  }
}

.step {
  flex: 1;
  text-align: center;
  padding: 24px 16px;
}

.step-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-primary);
  padding: 4px 10px;
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  margin-bottom: 16px;
}

.step-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 14px;
  color: var(--text-secondary);
  max-width: 260px;
  margin: 0 auto;
  line-height: 1.6;
}

.step-sep {
  display: none;
  width: 40px;
  height: 1px;
  background: var(--border-default);
  margin-top: 48px;
  align-self: center;
}

@media (min-width: 768px) {
  .step-sep {
    display: block;
  }
}

/* ============================================
   Free Section
   ============================================ */
.free-section {
  text-align: center;
}

.free-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 24px;
  line-height: 1.7;
}

.free-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.free-badge {
  padding: 6px 14px;
  border: 1px solid var(--border-default);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-surface);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  text-align: center;
  padding: 60px 0;
}

.cta-title {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  margin-bottom: 24px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 32px;
  background: var(--bg-surface);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.footer-tagline {
  font-size: 14px;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.footer-links a:hover,
.footer-links a:focus {
  color: var(--text-primary);
  outline: none;
}

.footer-legal {
  font-size: 12px;
  color: var(--text-muted);
  max-width: 400px;
  line-height: 1.6;
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .footer-brand {
    align-items: flex-start;
  }
}

/* ============================================
   Accessibility
   ============================================ */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================
   Mobile Nav Overlay
   ============================================ */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.nav-overlay.is-visible {
  opacity: 1;
  visibility: visible;
}

/* ============================================
   Download Page
   ============================================ */
.download-hero {
  padding: calc(var(--nav-height) + 60px) 0 80px;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 40px var(--accent-dim);
}

.download-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  color: var(--accent-primary);
}

.download-icon svg {
  width: 100%;
  height: 100%;
}

.download-title {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.download-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-family: var(--font-mono);
}

.btn-download {
  width: 100%;
  justify-content: center;
  margin-bottom: 20px;
}

.download-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 24px;
}

.download-meta-sep {
  color: var(--border-default);
}

.download-info {
  padding: 16px;
  background: var(--bg-inset);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  text-align: left;
}

.download-info-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.download-info code {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 2px 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  color: var(--accent-primary);
}

.download-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.download-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.download-link:hover,
.download-link:focus {
  border-color: var(--border-strong);
  color: var(--text-primary);
  outline: none;
}

.support-section {
  padding: 60px 0;
  border-top: 1px solid var(--border-subtle);
}

.support-desc {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto 24px;
  line-height: 1.7;
}

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

.nav-link--active::after {
  width: 100%;
}
.download-warning {
  padding: 16px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  text-align: left;
}

.download-warning-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.download-warning-text strong {
  color: var(--accent-secondary);
}