/* ============================
   Cyber Warfare - Main Stylesheet
   Font pairing: Space Grotesk (headings) + Inter (body)
   Modern dark cybersecurity aesthetic
   ============================ */

:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(255,255,255,0.03);
  --border-subtle: rgba(255,255,255,0.08);
  --accent: #22d3ee;
  --accent-glow: rgba(34,211,238,0.3);
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 50px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-secondary);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
main { flex: 1; }
h1, h2, h3, h4 { font-family: 'Space Grotesk', sans-serif; color: var(--text-primary); font-weight: 700; }
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { opacity: 0.85; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* Screen reader only */
.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; }

/* --- Sticky Nav --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}
.site-header.scrolled {
  background: rgba(10,14,26,0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo { height: 40px; width: auto; }
.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
  list-style: none;
}
.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  opacity: 1;
}
.nav-cta {
  background: linear-gradient(135deg, var(--accent), #0891b2);
  color: var(--bg-primary);
  padding: 10px 24px;
  border-radius: var(--radius-full);
  font-weight: 600;
}
.nav-cta:hover {
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-1px);
  opacity: 1;
}

/* Mobile nav */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}
@media (max-width: 768px) {
  .mobile-toggle { display: block; }
  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 24px;
    border-left: 1px solid var(--border-subtle);
    z-index: 999;
  }
  .nav-links.open { display: flex; }
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,14,26,0.7) 0%, rgba(10,14,26,0.95) 100%);
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 0 24px;
}
.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.1;
  margin-bottom: 24px;
}
.hero .accent-text {
  background: linear-gradient(135deg, var(--accent), #06b6d4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
}
.btn-primary {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), #0891b2);
  color: var(--bg-primary);
  padding: 16px 40px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 1.05rem;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}
.btn-primary:hover {
  box-shadow: 0 0 30px var(--accent-glow);
  transform: translateY(-2px);
  color: var(--bg-primary);
  opacity: 1;
}
.btn-outline {
  display: inline-block;
  background: transparent;
  color: var(--accent);
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--accent);
  transition: var(--transition);
  cursor: pointer;
}
.btn-outline:hover {
  background: rgba(34,211,238,0.1);
  color: var(--text-primary);
  opacity: 1;
}

/* --- Sections --- */
.section { padding: 100px 0; }
.section-alt { background: var(--bg-secondary); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-label {
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 16px;
}
.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
}
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-header .section-subtitle { margin: 0 auto; }

/* --- Glass Cards --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition);
}
.glass-card:hover {
  transform: translateY(-4px);
  border-color: rgba(34,211,238,0.3);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}
.glass-card img {
  width: 100%;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}
.glass-card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}
.glass-card p {
  color: var(--text-secondary);
  line-height: 1.7;
}
.card-link {
  display: inline-block;
  margin-top: 16px;
  color: var(--accent);
  font-weight: 600;
}
.card-link:hover { opacity: 0.85; }

/* --- Feature Cards --- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
@media (max-width: 768px) { .feature-grid { grid-template-columns: 1fr; } }
.feature-card {
  text-align: center;
  padding: 40px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: var(--transition);
}
.feature-card:hover { border-color: rgba(34,211,238,0.3); }
.feature-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
}
.feature-card .card-title {
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--accent);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
}
.feature-card blockquote {
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.7;
  border: none;
  padding: 0;
  margin: 0;
}
.social-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 20px;
}
.social-links a {
  color: var(--text-muted);
  font-size: 1.1rem;
  transition: var(--transition);
}
.social-links a:hover { color: var(--accent); opacity: 1; }
.social-links svg { width: 20px; height: 20px; }

/* --- Walter Section --- */
.walter-section {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}
.walter-grid {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 60px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
@media (max-width: 768px) {
  .walter-grid { grid-template-columns: 1fr; text-align: center; }
}
.walter-image {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent);
  box-shadow: 0 0 40px var(--accent-glow);
}
@media (max-width: 768px) {
  .walter-image { margin: 0 auto; width: 250px; height: 250px; }
}
.walter-label {
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
  display: block;
}
.walter-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 20px;
}
.walter-bio {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

/* --- Newsletter --- */
.newsletter-section {
  padding: 100px 0;
  text-align: center;
  background: linear-gradient(135deg, rgba(34,211,238,0.05) 0%, rgba(10,14,26,1) 100%);
}
.newsletter-section h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  margin-bottom: 16px;
}
.newsletter-section p {
  max-width: 600px;
  margin: 0 auto 32px;
  color: var(--text-secondary);
  line-height: 1.8;
}
.newsletter-form {
  display: flex;
  max-width: 500px;
  margin: 32px auto 0;
  gap: 0;
}
.newsletter-form input {
  flex: 1;
  padding: 16px 24px;
  border: 1px solid var(--border-subtle);
  border-right: none;
  border-radius: var(--radius-full) 0 0 var(--radius-full);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 1rem;
  outline: none;
  font-family: 'Inter', sans-serif;
}
.newsletter-form input::placeholder { color: var(--text-muted); }
.newsletter-form input:focus { border-color: var(--accent); }
.newsletter-form button {
  padding: 16px 32px;
  background: linear-gradient(135deg, var(--accent), #0891b2);
  color: var(--bg-primary);
  border: none;
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  font-family: 'Space Grotesk', sans-serif;
}
.newsletter-form button:hover { box-shadow: 0 0 20px var(--accent-glow); }

/* --- Footer --- */
.site-footer {
  padding: 60px 0 30px;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-primary);
  margin-top: auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-brand img { height: 36px; margin-bottom: 16px; }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; }
.footer-col h4 {
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-bottom: 16px;
  font-family: 'Space Grotesk', sans-serif;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: var(--text-muted); font-size: 0.9rem; }
.footer-col a:hover { color: var(--text-primary); opacity: 1; }
.footer-bottom {
  text-align: center;
  padding-top: 30px;
  margin-top: 40px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.85rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* --- Scroll animations --- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Page Header (blog, partners, etc.) --- */
.page-header {
  padding: 140px 0 60px;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(34, 211, 238, 0.06) 0%, transparent 60%),
    var(--bg-primary);
  border-bottom: 1px solid var(--border-subtle);
  text-align: center;
}
.page-header h1 { margin-bottom: 16px; }
.page-description {
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  font-size: 1.1rem;
}

/* --- Blog --- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}
.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.blog-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}
.blog-card-content { padding: 28px; }
.blog-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: rgba(34,211,238,0.1);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}
.blog-card-title { font-size: 1.25rem; margin-bottom: 8px; }
.blog-card-excerpt { color: var(--text-secondary); font-size: 0.95rem; }

/* --- Blog Single --- */
.blog-single { padding: 140px 0 100px; }
.blog-header {
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-subtle);
  text-transform: capitalize;
}
.blog-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}
.blog-body .btn-primary { margin-top: 28px; }

/* --- Partners --- */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}
.partner-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition);
}
.partner-card:hover {
  border-color: rgba(34,211,238,0.3);
  transform: translateY(-2px);
}
.partner-card h3 { margin-bottom: 12px; }
.partner-card p { color: var(--text-secondary); }

/* --- Walter Interface (ask-walter page) --- */
.walter-interface {
  text-align: center;
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}
.walter-avatar {
  font-size: 4rem;
  color: var(--accent);
  margin-bottom: 20px;
}
.walter-greeting {
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.walter-status {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* --- CTA Block --- */
.section-cta { background: var(--bg-secondary); border-top: 1px solid var(--border-subtle); border-bottom: 1px solid var(--border-subtle); }
.cta-block { text-align: center; max-width: 600px; margin: 0 auto; }
.cta-block h2 { margin-bottom: 16px; }
.cta-block p { color: var(--text-secondary); margin-bottom: 28px; }

/* --- Error Page --- */
.error-page {
  padding: 140px 0 100px;
  text-align: center;
  min-height: 50vh;
  display: flex;
  align-items: center;
}
.error-content { width: 100%; }
.error-code {
  display: block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 700;
  color: var(--accent);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: 12px;
}
.error-content h1 { margin-bottom: 12px; }
.error-content p { color: var(--text-secondary); margin-bottom: 28px; }

/* --- Responsive: Tablet --- */
@media (min-width: 768px) and (max-width: 1023px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

/* --- Responsive: Large Desktop --- */
@media (min-width: 1920px) {
  .container, .nav-container, .walter-grid, .footer-grid { max-width: 1400px; }
}