/* ============================================================
   NetRecon Landing — Main Stylesheet
   Dark theme, IBM Plex Sans / Mono
   ============================================================ */

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

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a1f2e;
  --bg-card-hover: #232a3b;
  --bg-accent: #0f172a;
  --border-color: #1e293b;
  --border-light: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #3b82f6;
  --accent-blue-hover: #2563eb;
  --accent-cyan: #06b6d4;
  --accent-green: #10b981;
  --accent-orange: #f59e0b;
  --accent-red: #ef4444;
  --accent-purple: #8b5cf6;
  --gradient-primary: linear-gradient(135deg, #3b82f6, #06b6d4);
  --gradient-hero: linear-gradient(180deg, #0a0e17 0%, #111827 100%);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.5);
  --shadow-glow: 0 0 30px rgba(59,130,246,.15);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Fira Code', monospace;
  --max-width: 1200px;
  --nav-height: 72px;
}

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
}

a { color: var(--accent-blue); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-cyan); }
img { max-width: 100%; height: auto; }

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

h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.25; color: var(--text-primary); }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.font-mono { font-family: var(--font-mono); }

/* --- Navbar --- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height);
  background: rgba(10, 14, 23, .85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background .3s;
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }

.nav-brand { display: flex; align-items: center; gap: 10px; font-size: 1.25rem; font-weight: 700; color: var(--text-primary); }
.nav-brand .brand-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
.nav-links a {
  color: var(--text-secondary); font-size: .9rem; font-weight: 500;
  transition: color .2s; position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--gradient-primary); border-radius: 1px;
}

.nav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 20px; background: var(--gradient-primary); color: #fff !important;
  border-radius: var(--radius-sm); font-size: .875rem; font-weight: 600;
  transition: opacity .2s, transform .2s;
}
.nav-cta:hover { opacity: .9; transform: translateY(-1px); }

.lang-selector { position: relative; }
.lang-selector select {
  appearance: none; background: var(--bg-card); color: var(--text-secondary);
  border: 1px solid var(--border-color); border-radius: var(--radius-sm);
  padding: 6px 28px 6px 10px; font-size: .8rem; font-family: var(--font-mono); cursor: pointer;
}
.lang-selector::after {
  content: '\25BE'; position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  color: var(--text-muted); pointer-events: none; font-size: .7rem;
}

.nav-toggle {
  display: none; background: none; border: none; color: var(--text-primary);
  font-size: 1.5rem; cursor: pointer; padding: 4px;
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: var(--nav-height); left: 0; right: 0;
    flex-direction: column; background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color); padding: 24px; gap: 20px;
  }
  .nav-links.open { display: flex; }
}

/* --- Sections --- */
section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 56px; }
.section-header h2 { margin-bottom: 12px; }
.section-header p { color: var(--text-secondary); font-size: 1.1rem; max-width: 600px; margin: 0 auto; }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 28px; border-radius: var(--radius-sm); font-size: .95rem;
  font-weight: 600; font-family: var(--font-sans); border: none; cursor: pointer;
  transition: all .25s;
}
.btn-primary { background: var(--gradient-primary); color: #fff; }
.btn-primary:hover { opacity: .9; transform: translateY(-2px); box-shadow: var(--shadow-glow); }
.btn-secondary { background: transparent; color: var(--text-primary); border: 1px solid var(--border-light); }
.btn-secondary:hover { border-color: var(--accent-blue); color: var(--accent-blue); }
.btn-ghost { background: transparent; color: var(--accent-blue); padding: 8px 16px; }
.btn-ghost:hover { color: var(--accent-cyan); }

/* --- Footer --- */
.footer {
  background: var(--bg-accent);
  border-top: 1px solid var(--border-color);
  padding: 64px 0 32px;
}
.footer-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 48px; margin-bottom: 48px; }
.footer-brand p { color: var(--text-secondary); font-size: .9rem; margin-top: 12px; max-width: 280px; }
.footer-col h4 {
  font-size: .8rem; text-transform: uppercase; letter-spacing: .08em;
  color: var(--text-muted); margin-bottom: 16px;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: var(--text-secondary); font-size: .9rem; }
.footer-col a:hover { color: var(--text-primary); }

.footer-bottom {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 24px; border-top: 1px solid var(--border-color);
  color: var(--text-muted); font-size: .8rem;
}
.footer-social { display: flex; gap: 16px; }
.footer-social a { color: var(--text-muted); font-size: 1.1rem; }
.footer-social a:hover { color: var(--text-primary); }

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

.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;
}