/* ==========================================================================
   KSPTech — Core Stylesheet
   Design system, layout primitives, and shared components.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Color system */
  --primary: #0A1628;        /* deep navy */
  --primary-light: #12233F;
  --secondary: #2457E8;      /* electric blue */
  --secondary-light: #4E7AFF;
  --accent: #17C7D6;         /* cyan */
  --accent-violet: #7C5CFF;  /* violet accent */
  --background: #FFFFFF;
  --surface: #F5F7FA;
  --surface-alt: #EEF1F6;
  --text: #0E1726;
  --muted: #5B6577;
  --border: #E3E7EE;
  --dark-bg: #050B16;
  --dark-surface: #0D1626;
  --dark-border: #1B2740;
  --dark-text: #E7ECF5;
  --dark-muted: #8B96AB;

  /* Type */
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Scale */
  --fs-xs: 0.8125rem;
  --fs-sm: 0.9375rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.375rem;
  --fs-2xl: 1.75rem;
  --fs-3xl: 2.25rem;
  --fs-4xl: 3rem;
  --fs-5xl: 3.75rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radii & shadows */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 999px;

  --shadow-sm: 0 1px 2px rgba(10, 22, 40, 0.06), 0 1px 1px rgba(10, 22, 40, 0.04);
  --shadow-md: 0 8px 24px rgba(10, 22, 40, 0.08), 0 2px 6px rgba(10, 22, 40, 0.05);
  --shadow-lg: 0 20px 50px rgba(10, 22, 40, 0.12), 0 6px 16px rgba(10, 22, 40, 0.06);
  --shadow-glow: 0 0 0 1px rgba(36, 87, 232, 0.14), 0 12px 40px rgba(36, 87, 232, 0.16);

  --container: 1240px;
  --nav-h: 84px;
  --nav-h-scrolled: 66px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--background);
  line-height: 1.6;
  font-size: var(--fs-base);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }
svg { display: block; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--text);
}

:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Layout primitives ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section { padding-block: var(--space-24); }
.section--tight { padding-block: var(--space-16); }
.section--dark {
  background: var(--dark-bg);
  color: var(--dark-text);
  position: relative;
  overflow: hidden;
}
.section--dark h1, .section--dark h2, .section--dark h3 { color: #fff; }
.section--surface { background: var(--surface); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--secondary);
  font-weight: 500;
  margin-bottom: var(--space-4);
}
.eyebrow::before {
  content: '';
  width: 22px;
  height: 1px;
  background: var(--secondary);
}
.section--dark .eyebrow { color: var(--accent); }
.section--dark .eyebrow::before { background: var(--accent); }

.section-head {
  max-width: 640px;
  margin-bottom: var(--space-16);
}
.section-head.center { margin-inline: auto; text-align: center; }
.section-head h2 { font-size: var(--fs-4xl); margin-bottom: var(--space-4); }
.section-head p { color: var(--muted); font-size: var(--fs-lg); }
.section--dark .section-head p { color: var(--dark-muted); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.9rem 1.7rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--fs-sm);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), background 0.25s ease, color 0.25s ease, border-color .25s ease;
  white-space: nowrap;
  will-change: transform;
}
.btn:active { transform: translateY(1px) scale(0.99); }

.btn-primary {
  background: linear-gradient(135deg, var(--secondary), var(--accent-violet));
  color: #fff;
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 36px rgba(36,87,232,0.28); }

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--secondary); color: var(--secondary); transform: translateY(-2px); }

.section--dark .btn-outline { color: #fff; border-color: rgba(255,255,255,0.22); }
.section--dark .btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.btn-ghost {
  color: var(--secondary);
  font-weight: 600;
  gap: var(--space-1);
  padding: 0.5rem 0;
}
.btn-ghost svg { transition: transform 0.3s var(--ease); width: 16px; height: 16px; }
.btn-ghost:hover svg { transform: translateX(4px); }

.btn-sm { padding: 0.65rem 1.25rem; font-size: var(--fs-xs); }
.btn-block { width: 100%; }

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 1000;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border-bottom: 1px solid transparent;
  transition: height 0.35s var(--ease), background 0.35s ease, border-color 0.35s ease, box-shadow .35s ease;
}
.navbar.is-scrolled {
  height: var(--nav-h-scrolled);
  background: rgba(255, 255, 255, 0.9);
  border-bottom-color: var(--border);
  box-shadow: 0 4px 24px rgba(10,22,40,0.05);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: baseline;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  color: var(--primary);
}
.logo span { color: var(--secondary); }
.logo small {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-left: 6px;
  font-weight: 500;
  text-transform: uppercase;
  align-self: center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.nav-links a {
  position: relative;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text);
  padding: 6px 0;
  transition: color 0.25s ease;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--secondary), var(--accent));
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.nav-links a:hover { color: var(--secondary); }
.nav-links a:hover::after,
.nav-links a.active::after { transform: scaleX(1); }
.nav-links a.active { color: var(--secondary); }

.nav-right { display: flex; align-items: center; gap: var(--space-6); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 26px;
  z-index: 1100;
}
.hamburger span {
  display: block;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: transform 0.35s var(--ease), opacity 0.25s ease;
}
.hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.is-open span:nth-child(2) { opacity: 0; }
.hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 1050;
  background: var(--primary);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-8);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.5s var(--ease), opacity 0.4s ease, visibility 0s linear 0.5s;
}
.mobile-menu.is-open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
  transition: transform 0.5s var(--ease), opacity 0.4s ease;
}
.mobile-menu a {
  display: block;
  font-family: var(--font-display);
  font-size: var(--fs-3xl);
  font-weight: 600;
  color: #fff;
  padding: var(--space-3) 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.mobile-menu.is-open a { opacity: 1; transform: translateY(0); }
.mobile-menu a:nth-child(1) { transition-delay: 0.08s; }
.mobile-menu a:nth-child(2) { transition-delay: 0.13s; }
.mobile-menu a:nth-child(3) { transition-delay: 0.18s; }
.mobile-menu a:nth-child(4) { transition-delay: 0.23s; }
.mobile-menu a:nth-child(5) { transition-delay: 0.28s; }
.mobile-menu a:nth-child(6) { transition-delay: 0.33s; }
.mobile-menu a:nth-child(7) { transition-delay: 0.38s; }
.mobile-menu .btn { margin-top: var(--space-6); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding-top: calc(var(--nav-h) + var(--space-24));
  padding-bottom: var(--space-24);
  background: var(--background);
  overflow: hidden;
}
.hero .container {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-16);
  align-items: center;
}
.hero-copy h1 {
  font-size: clamp(2.4rem, 4.6vw, var(--fs-5xl));
  margin-bottom: var(--space-6);
}
.hero-copy h1 .accent-text {
  background: linear-gradient(120deg, var(--secondary), var(--accent-violet) 80%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-copy p {
  font-size: var(--fs-lg);
  color: var(--muted);
  max-width: 46ch;
  margin-bottom: var(--space-8);
}
.hero-actions { display: flex; gap: var(--space-4); flex-wrap: wrap; }

.page-hero {
  padding-top: calc(var(--nav-h) + var(--space-16));
  padding-bottom: var(--space-16);
}
.page-hero .eyebrow { color: var(--accent); }
.page-hero h1 { font-size: clamp(2.2rem, 4.5vw, var(--fs-5xl)); max-width: 16ch; }
.page-hero p { font-size: var(--fs-lg); color: var(--dark-muted); max-width: 56ch; margin-top: var(--space-4); }

/* ---------- Hero visual (network / grid graphic) ---------- */
.hero-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-visual .orbit-svg { width: 100%; height: 100%; }

.float-card {
  position: absolute;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.float-card .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.float-card--1 { top: 6%; left: -2%; animation: floatY 5s ease-in-out infinite; }
.float-card--2 { bottom: 14%; right: -4%; animation: floatY 6s ease-in-out infinite 0.6s; }
.float-card--3 { bottom: -2%; left: 14%; animation: floatY 5.5s ease-in-out infinite 1.1s; }

/* ---------- Stats ---------- */
.stats { background: var(--primary); color: #fff; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
  text-align: center;
}
.stat .stat-number {
  font-family: var(--font-display);
  font-size: var(--fs-4xl);
  font-weight: 700;
  background: linear-gradient(120deg, #fff, var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat .stat-label {
  margin-top: var(--space-2);
  font-size: var(--fs-sm);
  color: rgba(255,255,255,0.65);
  letter-spacing: 0.03em;
}

/* ---------- About preview / split ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}
.split-visual {
  position: relative;
  aspect-ratio: 4/3.2;
  border-radius: var(--radius-lg);
  background: linear-gradient(155deg, var(--primary), #142544 60%, var(--secondary));
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.split-visual .grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 32px 32px;
}
.split-visual .glow {
  position: absolute;
  width: 60%; height: 60%;
  background: radial-gradient(circle, rgba(23,199,214,0.55), transparent 70%);
  filter: blur(20px);
  top: -10%; right: -10%;
}
.split-copy h2 { font-size: var(--fs-4xl); margin-bottom: var(--space-6); }
.split-copy p { color: var(--muted); font-size: var(--fs-lg); margin-bottom: var(--space-6); }
.split-copy .btn-ghost { margin-bottom: var(--space-6); }

.check-list { display: grid; gap: var(--space-3); margin-bottom: var(--space-8); }
.check-list li { display: flex; align-items: flex-start; gap: var(--space-3); color: var(--text); font-size: var(--fs-sm); }
.check-list svg { flex-shrink: 0; color: var(--secondary); margin-top: 3px; width: 18px; height: 18px; }

/* ---------- Cards grid ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}
.card-grid--2 { grid-template-columns: repeat(2, 1fr); }
.card-grid--4 { grid-template-columns: repeat(4, 1fr); }

.service-card {
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s ease;
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(160deg, rgba(36,87,232,0.05), rgba(124,92,255,0.05));
  opacity: 0;
  transition: opacity 0.4s ease;
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.service-card:hover::before { opacity: 1; }
.service-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--secondary), var(--accent-violet));
  color: #fff;
  margin-bottom: var(--space-6);
  position: relative; z-index: 1;
}
.service-icon svg { width: 24px; height: 24px; }
.service-card h3 { font-size: var(--fs-xl); margin-bottom: var(--space-3); position: relative; z-index: 1; }
.service-card p { color: var(--muted); font-size: var(--fs-sm); margin-bottom: var(--space-6); position: relative; z-index: 1; }
.service-card .btn-ghost { position: relative; z-index: 1; font-size: var(--fs-sm); }

/* ---------- Why KSPTech ---------- */
.benefit-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--dark-border); border-radius: var(--radius-lg); overflow: hidden; }
.benefit-card {
  background: var(--dark-surface);
  padding: var(--space-8);
  transition: background 0.35s ease;
}
.benefit-card:hover { background: #111f38; }
.benefit-num { font-family: var(--font-mono); color: var(--accent); font-size: var(--fs-sm); letter-spacing: 0.08em; }
.benefit-card h3 { color: #fff; font-size: var(--fs-lg); margin: var(--space-3) 0 var(--space-2); }
.benefit-card p { color: var(--dark-muted); font-size: var(--fs-sm); }

/* ---------- Technologies ---------- */
.tech-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-4); }
.tech-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6) var(--space-4);
  text-align: center;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), background 0.3s ease;
}
.tech-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); background: #fff; }
.tech-card i, .tech-card svg { font-size: 1.9rem; color: var(--secondary); margin-bottom: var(--space-3); }
.tech-card span { display: block; font-size: var(--fs-xs); font-weight: 600; color: var(--text); }

.tech-category { margin-bottom: var(--space-16); }
.tech-category-head { display: flex; align-items: baseline; gap: var(--space-3); margin-bottom: var(--space-6); }
.tech-category-head h3 { font-size: var(--fs-2xl); }
.tech-category-head span { font-family: var(--font-mono); color: var(--muted); font-size: var(--fs-xs); }

.filter-bar { display: flex; gap: var(--space-3); flex-wrap: wrap; margin-bottom: var(--space-12); }
.filter-btn {
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--border);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--muted);
  transition: all 0.25s ease;
}
.filter-btn:hover { border-color: var(--secondary); color: var(--secondary); }
.filter-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ---------- Process / timeline ---------- */
.process-track { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }
.process-track::before {
  content: '';
  position: absolute; top: 34px; left: 8%; right: 8%; height: 1px;
  background: linear-gradient(90deg, var(--border), var(--secondary), var(--border));
}
.process-step { position: relative; }
.process-step .step-num {
  width: 68px; height: 68px; border-radius: 50%;
  background: var(--background);
  border: 1.5px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-weight: 600; color: var(--secondary);
  margin-bottom: var(--space-6);
  position: relative; z-index: 1;
  transition: background 0.4s ease, color 0.4s ease, border-color 0.4s ease, transform .4s var(--ease);
}
.process-step.in-view .step-num {
  background: linear-gradient(135deg, var(--secondary), var(--accent-violet));
  color: #fff; border-color: transparent; transform: scale(1.05);
}
.process-step h3 { font-size: var(--fs-lg); margin-bottom: var(--space-2); }
.process-step p { color: var(--muted); font-size: var(--fs-sm); }

/* ---------- Projects ---------- */
.project-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
  display: flex; flex-direction: column;
  cursor: pointer;
}
.project-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.project-thumb {
  aspect-ratio: 16/10.5;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  position: relative;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.project-thumb::after {
  content: '';
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px);
  background-size: 26px 26px;
}
.project-thumb .thumb-glyph { font-family: var(--font-display); font-size: 3rem; font-weight: 700; color: rgba(255,255,255,0.18); position: relative; z-index: 1; }
.project-body { padding: var(--space-6); flex: 1; display: flex; flex-direction: column; }
.project-body .project-cat { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--secondary); text-transform: uppercase; letter-spacing: .08em; margin-bottom: var(--space-2); }
.project-body h3 { font-size: var(--fs-xl); margin-bottom: var(--space-2); }
.project-body p { color: var(--muted); font-size: var(--fs-sm); margin-bottom: var(--space-4); flex: 1; }
.tag-row { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-4); }
.tag {
  font-size: var(--fs-xs); font-weight: 600; color: var(--secondary);
  background: rgba(36,87,232,0.08); padding: 4px 10px; border-radius: var(--radius-full);
}

/* ---------- CTA ---------- */
.cta-section { position: relative; text-align: center; }
.cta-section h2 { font-size: var(--fs-4xl); max-width: 18ch; margin-inline: auto; margin-bottom: var(--space-6); }
.cta-section p { color: var(--dark-muted); font-size: var(--fs-lg); max-width: 46ch; margin-inline: auto; margin-bottom: var(--space-10); }
.cta-glow {
  position: absolute; width: 700px; height: 700px; border-radius: 50%;
  background: radial-gradient(circle, rgba(36,87,232,0.25), transparent 65%);
  top: 50%; left: 50%; transform: translate(-50%, -50%);
  filter: blur(10px);
  pointer-events: none;
}

/* ---------- Footer ---------- */
.footer { background: var(--dark-bg); color: var(--dark-muted); padding-top: var(--space-24); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-12);
  padding-bottom: var(--space-16);
  border-bottom: 1px solid var(--dark-border);
}
.footer-brand .logo { color: #fff; }
.footer-brand p { margin-top: var(--space-4); max-width: 32ch; font-size: var(--fs-sm); }
.footer-social { display: flex; gap: var(--space-3); margin-top: var(--space-6); }
.footer-social a {
  width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid var(--dark-border);
  display: flex; align-items: center; justify-content: center;
  transition: border-color 0.3s ease, color 0.3s ease, transform .3s var(--ease);
}
.footer-social a:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-3px); }
.footer-social svg { width: 16px; height: 16px; }
.footer-col h4 { color: #fff; font-size: var(--fs-sm); margin-bottom: var(--space-4); letter-spacing: 0.02em; }
.footer-col a { display: block; font-size: var(--fs-sm); padding: 6px 0; transition: color 0.25s ease; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: var(--space-6);
  font-size: var(--fs-xs);
  flex-wrap: wrap; gap: var(--space-3);
}
.footer-bottom .legal-links { display: flex; gap: var(--space-6); }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
  z-index: 900;
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--secondary); }
.back-to-top svg { width: 18px; height: 18px; }

/* ---------- Page loader ---------- */
.page-loader {
  position: fixed; inset: 0; z-index: 3000;
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  transition: opacity 0.5s ease, visibility 0.5s;
}
.page-loader.is-hidden { opacity: 0; visibility: hidden; }
.loader-mark {
  font-family: var(--font-display); font-weight: 700; font-size: var(--fs-2xl); color: #fff;
  display: flex; align-items: center; gap: var(--space-3);
}
.loader-bar { width: 120px; height: 2px; background: rgba(255,255,255,0.15); border-radius: 2px; overflow: hidden; }
.loader-bar::after {
  content: ''; display: block; height: 100%; width: 40%;
  background: linear-gradient(90deg, var(--secondary), var(--accent));
  animation: loaderMove 1.1s ease-in-out infinite;
}

/* ---------- Forms ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); }
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-size: var(--fs-sm); font-weight: 600; color: var(--text); }
.form-group label .req { color: var(--secondary); }
.form-group input, .form-group select, .form-group textarea {
  padding: 0.85rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--background);
  font-size: var(--fs-sm);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--secondary);
  box-shadow: 0 0 0 4px rgba(36,87,232,0.1);
  outline: none;
}
.form-group textarea { resize: vertical; min-height: 130px; }
.form-group.error input, .form-group.error select, .form-group.error textarea { border-color: #E4483F; }
.error-msg { font-size: var(--fs-xs); color: #E4483F; display: none; }
.form-group.error .error-msg { display: block; }
.form-success {
  display: none;
  align-items: center; gap: var(--space-3);
  background: rgba(23,199,214,0.1);
  border: 1px solid rgba(23,199,214,0.35);
  color: #0B7A85;
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-6);
  font-size: var(--fs-sm);
  font-weight: 500;
}
.form-success.is-visible { display: flex; }

/* ---------- Contact info cards ---------- */
.info-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-5); margin-top: var(--space-16); }
.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
}
.info-card .service-icon { width: 42px; height: 42px; margin-bottom: var(--space-4); }
.info-card .service-icon svg { width: 20px; height: 20px; }
.info-card h4 { font-size: var(--fs-base); margin-bottom: var(--space-2); }
.info-card p { color: var(--muted); font-size: var(--fs-sm); }
.placeholder-note { color: var(--accent-violet); font-size: 0.7rem; font-weight: 600; }

/* ---------- Careers job cards ---------- */
.job-card {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-6);
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6) var(--space-8);
  margin-bottom: var(--space-4);
  transition: box-shadow 0.35s ease, border-color 0.35s ease, transform .35s var(--ease);
}
.job-card:hover { box-shadow: var(--shadow-md); border-color: transparent; transform: translateX(4px); }
.job-title { font-size: var(--fs-lg); font-weight: 600; margin-bottom: var(--space-2); }
.job-meta { display: flex; gap: var(--space-4); flex-wrap: wrap; color: var(--muted); font-size: var(--fs-xs); }
.job-meta span { display: flex; align-items: center; gap: 5px; }
.job-skills { display: flex; gap: var(--space-2); flex-wrap: wrap; margin-top: var(--space-3); }

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(6,12,24,0.6);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  z-index: 2000; padding: var(--space-6);
  opacity: 0; visibility: hidden; transition: opacity 0.3s ease, visibility 0.3s;
}
.modal-overlay.is-open { opacity: 1; visibility: visible; }
.modal {
  background: var(--background);
  border-radius: var(--radius-lg);
  max-width: 640px; width: 100%;
  max-height: 85vh; overflow-y: auto;
  padding: var(--space-8);
  position: relative;
  transform: translateY(24px) scale(0.98);
  transition: transform 0.35s var(--ease);
  box-shadow: var(--shadow-lg);
}
.modal-overlay.is-open .modal { transform: translateY(0) scale(1); }
.modal-close {
  position: absolute; top: var(--space-5); right: var(--space-5);
  width: 34px; height: 34px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface);
  transition: background 0.25s ease, transform .25s ease;
}
.modal-close:hover { background: var(--border); transform: rotate(90deg); }

/* ---------- 404 ---------- */
.error-page {
  min-height: 100vh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
  padding: var(--space-8);
  background: var(--primary);
  color: #fff;
}
.error-code {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(5rem, 18vw, 10rem);
  background: linear-gradient(120deg, #fff, var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  line-height: 1;
}
.error-page p { color: rgba(255,255,255,0.65); font-size: var(--fs-lg); margin: var(--space-4) 0 var(--space-8); max-width: 40ch; }

/* ---------- FAQ ---------- */
.faq-item {
  border-bottom: 1px solid var(--border);
}
.faq-question {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-6) 0; text-align: left;
  font-family: var(--font-display); font-weight: 600; font-size: var(--fs-lg);
}
.faq-question svg { flex-shrink: 0; transition: transform 0.35s var(--ease); width: 20px; height: 20px; color: var(--secondary); }
.faq-item.is-open .faq-question svg { transform: rotate(45deg); }
.faq-answer {
  max-height: 0; overflow: hidden;
  transition: max-height 0.4s var(--ease);
  color: var(--muted); font-size: var(--fs-sm);
}
.faq-answer p { padding-bottom: var(--space-6); }

/* ---------- Values / Vision cards (about page) ---------- */
.value-card {
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  height: 100%;
}
.value-card .service-icon { margin-bottom: var(--space-5); }

.mission-vision { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-6); }
.mv-card {
  padding: var(--space-10);
  border-radius: var(--radius-lg);
  background: linear-gradient(155deg, var(--dark-surface), var(--primary));
  color: #fff;
  position: relative;
  overflow: hidden;
}
.mv-card .eyebrow { color: var(--accent); }
.mv-card p { color: var(--dark-muted); font-size: var(--fs-lg); margin-top: var(--space-4); }

/* ---------- Detail service page ---------- */
.service-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
  padding-block: var(--space-20, var(--space-16));
}
.service-detail:nth-of-type(even) .service-detail-visual { order: 2; }
.service-detail-num { font-family: var(--font-mono); color: var(--secondary); font-size: var(--fs-sm); letter-spacing: .1em; }
.service-detail h2 { font-size: var(--fs-3xl); margin: var(--space-3) 0 var(--space-5); }
.service-detail p.desc { color: var(--muted); font-size: var(--fs-lg); margin-bottom: var(--space-6); }
.service-detail-visual {
  aspect-ratio: 4/3.4;
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, var(--surface-alt), var(--surface));
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.mini-tag-row { display: flex; gap: var(--space-2); flex-wrap: wrap; margin-top: var(--space-6); }

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-8 { margin-top: var(--space-8); }
.mb-8 { margin-bottom: var(--space-8); }
hr.divider { border: none; border-top: 1px solid var(--border); margin-block: var(--space-16); }

@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}
@keyframes loaderMove {
  0% { transform: translateX(-120%); }
  100% { transform: translateX(340%); }
}