/* =====================================
   Monumental Systems — Site Styles
   ===================================== */

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg:       #0f172a;
  --color-surface:  #1e293b;
  --color-border:   #334155;
  --color-text:     #e2e8f0;
  --color-muted:    #94a3b8;
  --color-primary:  #3b82f6;
  --color-primary-hover: #2563eb;
  --color-accent:   #22d3ee;
  --color-white:    #ffffff;
  --radius:         8px;
  --radius-lg:      12px;
  --font:           'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-width:      1120px;
  --nav-height:     64px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ---------- Container ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  transition: background 0.3s, box-shadow 0.3s;
}

.nav.scrolled {
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--color-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-white);
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-muted);
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--color-white); }

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-muted);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: rgba(15, 23, 42, 0.98);
  backdrop-filter: blur(12px);
  padding: 24px;
  flex-direction: column;
  gap: 16px;
  z-index: 99;
  border-bottom: 1px solid var(--color-border);
}

.mobile-menu.open { display: flex; }

.mobile-menu a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-muted);
  padding: 8px 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 10px 20px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-sm { padding: 6px 16px; font-size: 0.85rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-muted);
  color: var(--color-white);
}

/* ---------- Hero ---------- */
.hero {
  padding: 160px 0 100px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.2;
  max-width: 720px;
  margin: 0 auto 24px;
  color: var(--color-white);
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--color-muted);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Sections ---------- */
.section {
  padding: 96px 0;
}

.section-alt {
  background: var(--color-surface);
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}

.section-header p {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- Features ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.feature {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color 0.2s;
}

.feature:hover { border-color: var(--color-primary); }

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

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

.feature h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 8px;
}

.feature p {
  font-size: 0.95rem;
  color: var(--color-muted);
  line-height: 1.6;
}

/* ---------- Projects ---------- */
.project-group { margin-bottom: 48px; }
.project-group:last-child { margin-bottom: 0; }

.project-group-title {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.project {
  display: block;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color 0.2s, transform 0.2s;
}

.project:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.project-featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(59,130,246,0.08), rgba(34,211,238,0.04));
  border-color: rgba(59,130,246,0.3);
}

.project-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.project-name {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-white);
}

.badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--color-surface);
  color: var(--color-muted);
  border: 1px solid var(--color-border);
}

.badge-primary {
  background: rgba(59,130,246,0.15);
  color: var(--color-primary);
  border-color: rgba(59,130,246,0.3);
}

.badge-secondary {
  background: rgba(34,211,238,0.1);
  color: var(--color-accent);
  border-color: rgba(34,211,238,0.2);
}

.project-desc {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-bottom: 14px;
  line-height: 1.6;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-tech span {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 20px;
  background: rgba(148,163,184,0.1);
  color: var(--color-muted);
}

/* ---------- Stack Grid ---------- */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.stack-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  transition: border-color 0.2s;
}

.stack-item:hover { border-color: var(--color-primary); }

.stack-item strong {
  font-size: 0.95rem;
  color: var(--color-white);
}

.stack-item span {
  font-size: 0.8rem;
  color: var(--color-muted);
}

/* ---------- Contact ---------- */
.contact-section {
  text-align: center;
}

.contact-section .btn-lg {
  margin-top: 8px;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.footer-inner a {
  color: var(--color-muted);
  transition: color 0.2s;
}

.footer-inner a:hover { color: var(--color-white); }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }

  .hero { padding: 120px 0 72px; }

  .section { padding: 64px 0; }

  .features { grid-template-columns: 1fr; }

  .projects { grid-template-columns: 1fr; }
  .project-featured { grid-column: auto; }

  .stack-grid { grid-template-columns: repeat(2, 1fr); }

  .footer-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}