/* ==========================================================================
   77bit Corporate Identity & Design System
   Modernist Swiss / Precision Editorial Aesthetic
   White canvas, deep navy typography, structured navbar, alpine green accents.
   Minimalist, airy, uncluttered, publication-grade clarity.
   ========================================================================== */

:root {
  /* Canvas & Surfaces */
  --bg-page: #ffffff;
  --bg-subtle: #f8fafc;
  --bg-surface: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;

  /* Architectural Hairlines */
  --border-subtle: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-dark: #94a3b8;

  /* Deep Precision Navy */
  --blue-primary: #002b66;       /* Deep Navy */
  --blue-royal: #0a58ca;         /* Cobalt action blue */
  --blue-hover: #001f4d;
  --blue-light: #2563eb;
  --blue-tint: rgba(10, 88, 202, 0.06);

  /* Alpine Green (Data & Verification Accent) */
  --green-primary: #059669;
  --green-bright: #10b981;
  --green-hover: #047857;
  --green-tint: rgba(5, 150, 105, 0.08);

  /* High-legibility Typography */
  --text-pure: #030a16;          /* Deepest blue-black */
  --text-primary: #0f172a;       /* Dark slate */
  --text-secondary: #475569;     /* Slate grey */
  --text-muted: #64748b;        /* Cool grey */

  /* Fonts */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Consolas, monospace;

  --radius-xs: 3px;
  --radius-sm: 6px;
  --radius-md: 10px;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-page);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Precision Hairline Grid (Ultra-subtle on light canvas) */
.bg-grid-pattern {
  background-image: 
    linear-gradient(to right, rgba(15, 23, 42, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 23, 42, 0.035) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 1rem 0;
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Circular Badge Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--blue-primary);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.03em;
}

.brand-emblem {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background-color: var(--blue-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
}

.brand-emblem span {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.825rem;
  letter-spacing: -0.04em;
  color: #ffffff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  transition: color 0.15s ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.825rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-xs);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--blue-primary);
  color: #ffffff;
  border-color: var(--blue-primary);
}

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

.btn-secondary {
  background-color: #ffffff;
  color: var(--text-pure);
  border-color: var(--border-medium);
}

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

.btn-accent {
  background-color: var(--green-primary);
  color: #ffffff;
  border-color: var(--green-primary);
}

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

/* Hero Section */
.hero {
  padding: 4.5rem 0 3.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-medium);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-xs);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--blue-primary);
  margin-bottom: 1.5rem;
}

.pill-dot {
  width: 7px;
  height: 7px;
  background-color: var(--green-primary);
  border-radius: 50%;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  color: var(--blue-primary);
  margin-bottom: 1.25rem;
  max-width: 900px;
}

.hero-title .text-blue {
  color: var(--blue-royal);
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 740px;
  margin-bottom: 2rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
}

.stat-item {
  border-left: 2px solid var(--blue-primary);
  padding-left: 1rem;
}

.stat-item.stat-green {
  border-left-color: var(--green-primary);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--blue-primary);
  margin-bottom: 0.2rem;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.725rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
}

/* Sections */
.section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  margin-bottom: 2.75rem;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.725rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--blue-royal);
  margin-bottom: 0.4rem;
  display: inline-block;
}

.section-tag.tag-green {
  color: var(--green-primary);
}

.section-title {
  font-size: 2.15rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--blue-primary);
  margin-bottom: 0.6rem;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 680px;
  line-height: 1.6;
}

/* 4 Core Pillars */
.grid-2x2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 2rem;
  transition: all 0.15s ease;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--blue-primary);
  box-shadow: 0 4px 16px rgba(0, 43, 102, 0.05);
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-xs);
  background-color: var(--blue-tint);
  border: 1px solid rgba(0, 43, 102, 0.15);
  color: var(--blue-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  margin-bottom: 1.25rem;
}

.card-icon.icon-green {
  background-color: var(--green-tint);
  border-color: rgba(5, 150, 105, 0.2);
  color: var(--green-primary);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--blue-primary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.015em;
}

.card-desc {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
}

.tag-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-xs);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

/* Feature Split & Demonstrators */
.feature-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 3.5rem;
}

.feature-split.reverse {
  direction: rtl;
}

.feature-split.reverse > * {
  direction: ltr;
}

.feature-content h3 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--blue-primary);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.feature-content p {
  color: var(--text-secondary);
  font-size: 0.975rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.demo-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--green-primary);
  background-color: var(--green-tint);
  border: 1px solid rgba(5, 150, 105, 0.25);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-xs);
  margin-bottom: 1rem;
}

.demo-question {
  background-color: var(--bg-subtle);
  border-left: 3px solid var(--blue-primary);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  margin: 1.25rem 0;
  font-style: italic;
  color: var(--blue-primary);
  font-weight: 500;
  font-size: 0.925rem;
  line-height: 1.55;
}

.feature-points {
  list-style: none;
  margin-bottom: 1.25rem;
}

.feature-points li {
  position: relative;
  padding-left: 1.4rem;
  margin-bottom: 0.65rem;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.feature-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 5px;
  height: 5px;
  background-color: var(--blue-royal);
  border-radius: 50%;
}

.feature-points.points-green li::before {
  background-color: var(--green-primary);
}

.feature-img-wrapper {
  background-color: #ffffff;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xs);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 43, 102, 0.06);
}

.feature-img-wrapper img {
  width: 100%;
  height: auto;
  display: block;
}

/* Interactive Simulator */
.calculator-box {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xs);
  padding: 2rem;
  margin-top: 1.5rem;
}

.calc-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1rem;
}

.calc-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--blue-primary);
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.sim-slider-group {
  margin-bottom: 1rem;
}

.sim-slider-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.sim-slider-header span:last-child {
  font-family: var(--font-mono);
  color: var(--blue-royal);
  font-weight: 700;
}

.sim-slider {
  width: 100%;
  accent-color: var(--blue-primary);
  cursor: pointer;
  height: 5px;
  background: var(--border-medium);
  border-radius: 2px;
}

.calc-field label {
  display: block;
  font-size: 0.725rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.45rem;
  font-weight: 700;
}

.calc-field select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background-color: #ffffff;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xs);
  color: var(--blue-primary);
  font-family: inherit;
  font-size: 0.85rem;
}

.calc-results {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background-color: #ffffff;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xs);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  text-align: center;
}

.result-val {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--green-primary);
}

.result-lbl {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.project-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transition: all 0.15s ease;
}

.project-card:hover {
  border-color: var(--blue-primary);
  box-shadow: 0 4px 16px rgba(0, 43, 102, 0.04);
}

.project-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.675rem;
  font-weight: 700;
  color: var(--blue-royal);
  background-color: var(--blue-tint);
  border: 1px solid rgba(10, 88, 202, 0.15);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-xs);
  align-self: flex-start;
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.project-badge.badge-green {
  color: var(--green-primary);
  background-color: var(--green-tint);
  border-color: rgba(5, 150, 105, 0.2);
}

.project-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--blue-primary);
  margin-bottom: 0.45rem;
}

.project-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.project-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.75rem;
  display: flex;
  justify-content: space-between;
}

/* Contact */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: flex-start;
}

.contact-info h3 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--blue-primary);
  margin-bottom: 1rem;
}

.contact-info p {
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.75rem;
}

.contact-items {
  list-style: none;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.15rem;
  color: var(--blue-primary);
  font-size: 0.925rem;
}

.contact-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-xs);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-primary);
}

.contact-form {
  background-color: #ffffff;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xs);
  padding: 2rem;
  box-shadow: 0 2px 12px rgba(0, 43, 102, 0.04);
}

.form-group {
  margin-bottom: 1.15rem;
}

.form-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  background-color: #ffffff;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xs);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.875rem;
  transition: border-color 0.15s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue-primary);
}

/* Footer */
.footer {
  padding: 3rem 0;
  background-color: var(--bg-subtle);
  border-top: 1px solid var(--border-subtle);
  font-size: 0.825rem;
  color: var(--text-muted);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.75rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.775rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: var(--blue-primary);
}

/* Lightbox Modal */
.zoomable-img {
  cursor: zoom-in;
}

.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background-color: rgba(3, 10, 22, 0.85);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.modal-overlay.active {
  display: flex;
}

.modal-content {
  max-width: 92vw;
  max-height: 88vh;
  position: relative;
  background: #ffffff;
  padding: 0.5rem;
  border-radius: var(--radius-xs);
}

.modal-content img {
  width: 100%;
  height: auto;
  max-height: 84vh;
  object-fit: contain;
  display: block;
}

.modal-close {
  position: absolute;
  top: -12px;
  right: -12px;
  background-color: var(--blue-primary);
  border: none;
  color: #ffffff;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.15rem;
}

@media (max-width: 992px) {
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-2x2 {
    grid-template-columns: 1fr;
  }
  .feature-split, .feature-split.reverse {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .contact-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .calc-grid {
    grid-template-columns: 1fr;
  }
  .calc-results {
    grid-template-columns: 1fr;
  }
}