/* ============================================================
   JUSense Technology — Global Stylesheet
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── CSS Variables ──────────────────────────────────────────── */
:root {
  --bg:             #ffffff;
  --bg-secondary:   #f8fafc;
  --bg-tertiary:    #f1f5f9;
  --surface:        #ffffff;
  --surface-raised: #f8fafc;
  --border:         #e2e8f0;
  --border-subtle:  #f1f5f9;
  --text-primary:   #0f172a;
  --text-secondary: #475569;
  --text-muted:     #94a3b8;
  --accent:         #2563eb;
  --accent-hover:   #1d4ed8;
  --accent-light:   #dbeafe;
  --accent-subtle:  rgba(37, 99, 235, 0.08);
  --green:          #059669;
  --shadow-sm:      0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:      0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg:      0 10px 30px rgba(0,0,0,0.10), 0 4px 10px rgba(0,0,0,0.05);
  --shadow-xl:      0 20px 60px rgba(0,0,0,0.12), 0 8px 20px rgba(0,0,0,0.06);
  --radius-sm:      6px;
  --radius-md:      10px;
  --radius-lg:      16px;
  --radius-xl:      24px;
  --nav-height:     72px;
  --transition:     all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

.dark {
  --bg:             #07101f;
  --bg-secondary:   #0b1628;
  --bg-tertiary:    #0f1d34;
  --surface:        #0d1a2e;
  --surface-raised: #0f1d34;
  --border:         #1e3355;
  --border-subtle:  #162640;
  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #475569;
  --accent:         #3b82f6;
  --accent-hover:   #60a5fa;
  --accent-light:   rgba(59, 130, 246, 0.15);
  --accent-subtle:  rgba(59, 130, 246, 0.06);
  --green:          #10b981;
  --shadow-sm:      0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:      0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg:      0 10px 30px rgba(0,0,0,0.6);
  --shadow-xl:      0 20px 60px rgba(0,0,0,0.7);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

/* ── Typography ──────────────────────────────────────────────── */
.text-display {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.text-hero {
  font-size: clamp(1.75rem, 3.5vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.text-heading {
  font-size: clamp(1.5rem, 2.5vw, 2.25rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.text-subheading {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  font-weight: 600;
  line-height: 1.35;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ── Navbar ──────────────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: var(--transition);
}

#navbar.scrolled {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.dark #navbar.scrolled {
  background: rgba(7, 16, 31, 0.88);
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  flex-shrink: 0;
}

.nav-logo-mark {
  width: 38px;
  height: 38px;
  background: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.nav-logo-text {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.nav-logo-text span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  padding: 0.4rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--accent-subtle);
}

.nav-link.active {
  color: var(--accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  color: var(--accent);
}

.theme-toggle svg { width: 18px; height: 18px; }
.icon-sun { display: none; }
.dark .icon-sun { display: block; }
.dark .icon-moon { display: none; }

.btn-nav {
  padding: 0.5rem 1.125rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #fff;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-nav:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

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

/* Mobile nav */
#mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem 1.5rem;
  z-index: 999;
  box-shadow: var(--shadow-lg);
  animation: slideDown 0.2s ease;
}

#mobile-menu.open { display: block; }

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 1rem;
}

.mobile-nav-link {
  display: block;
  padding: 0.625rem 0.875rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--accent);
  background: var(--accent-subtle);
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 2px solid var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--accent);
  border: 2px solid transparent;
  padding-left: 0;
  padding-right: 0;
}

.btn-ghost:hover {
  gap: 0.75rem;
}

.btn-lg {
  padding: 0.875rem 2rem;
  font-size: 1rem;
}

.btn svg { width: 18px; height: 18px; flex-shrink: 0; }

/* ── Layout ──────────────────────────────────────────────────── */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 6rem 0;
}

.section-sm {
  padding: 4rem 0;
}

.section-header {
  margin-bottom: 3.5rem;
  text-align: center;
}

.section-header p {
  max-width: 600px;
  margin: 1rem auto 0;
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.7;
}

/* ── Hero ────────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

/* Light mode: subtle radial gradient */
.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 60% 40%, rgba(37,99,235,0.07) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 20% 70%, rgba(99,102,241,0.05) 0%, transparent 60%);
}

.dark .hero-gradient {
  background:
    radial-gradient(ellipse 80% 60% at 60% 40%, rgba(37,99,235,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 20% 70%, rgba(99,102,241,0.12) 0%, transparent 60%);
}

/* Grid pattern */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border-subtle) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-subtle) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
  opacity: 0.6;
}

.dark .hero-grid {
  opacity: 0.4;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
}

.hero-content {
  max-width: 760px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(37,99,235,0.2);
}

.dark .hero-badge {
  border-color: rgba(59,130,246,0.25);
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.6; transform: scale(0.8); }
}

.hero h1 { color: var(--text-primary); margin-bottom: 1.25rem; }

.hero-accent { color: var(--accent); }

.hero-description {
  font-size: 1.1875rem;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 580px;
  margin-bottom: 2.5rem;
}

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

.hero-stats {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.hero-stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
  letter-spacing: -0.03em;
}

.hero-stat-value span { color: var(--accent); }

.hero-stat-label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
  font-weight: 500;
}

/* ── Cards ───────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition);
}

.card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 1.25rem;
  transition: var(--transition);
}

.dark .card-icon {
  border-color: rgba(59,130,246,0.2);
}

.card:hover .card-icon {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.card-icon svg { width: 24px; height: 24px; }

.card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.625rem;
  letter-spacing: -0.01em;
}

.card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  transition: var(--transition);
}

.card-link:hover { gap: 0.65rem; }
.card-link svg { width: 15px; height: 15px; }

/* Services grid */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

/* ── Stats Strip ─────────────────────────────────────────────── */
.stats-strip {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  divide-x: 1px solid var(--border);
}

.stat-item {
  text-align: center;
  padding: 2.5rem 1rem;
  border-right: 1px solid var(--border);
}

.stat-item:last-child { border-right: none; }

.stat-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
  letter-spacing: -0.04em;
  margin-bottom: 0.375rem;
}

.stat-value .accent { color: var(--accent); }

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.stat-sublabel {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.125rem;
}

/* ── About Strip ─────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.about-visual {
  position: relative;
}

.about-visual-inner {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.about-visual-badge {
  position: absolute;
  bottom: 1.5rem;
  left: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.875rem 1.125rem;
  box-shadow: var(--shadow-md);
}

.about-visual-badge-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.about-visual-badge-value {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.affiliation-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.625rem 1rem;
  background: var(--accent-subtle);
  border: 1px solid var(--accent-light);
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
}

.dark .affiliation-badge { border-color: rgba(59,130,246,0.2); }

.affiliation-badge-text {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
}

.about-features {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  margin: 2rem 0;
}

.about-feature {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.about-feature-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 1px;
}

.dark .about-feature-icon { background: rgba(59,130,246,0.12); }
.about-feature-icon svg { width: 12px; height: 12px; }

.about-feature-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ── Case Study Cards ────────────────────────────────────────── */
.case-study-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.case-study-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.case-study-thumb {
  aspect-ratio: 16/9;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.case-study-thumb-placeholder {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-subtle) 0%, var(--bg-tertiary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  opacity: 0.6;
}

.case-study-thumb-placeholder svg { width: 40px; height: 40px; }

.case-study-domain {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.25rem 0.625rem;
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.case-study-body { padding: 1.5rem; }

.case-study-body h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.case-study-body p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.case-study-result {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--green);
  padding: 0.5rem 0.75rem;
  background: rgba(5, 150, 105, 0.08);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  border: 1px solid rgba(5, 150, 105, 0.15);
}

.case-study-result svg { width: 14px; height: 14px; }

/* ── Blog Cards ──────────────────────────────────────────────── */
.blog-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.blog-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.blog-thumb {
  aspect-ratio: 16/9;
  background: var(--bg-tertiary);
}

.blog-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.blog-tag {
  padding: 0.2rem 0.6rem;
  background: var(--accent-subtle);
  color: var(--accent);
  border-radius: 999px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.blog-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.blog-body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.blog-body p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  flex: 1;
  margin-bottom: 1.25rem;
}

/* ── CTA Section ─────────────────────────────────────────────── */
.cta-section {
  background: var(--accent);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
}

.cta-section::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255,255,255,0.04);
}

.cta-inner {
  position: relative;
  z-index: 1;
  text-align: center;
}

.cta-inner h2 {
  color: #fff;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.cta-inner p {
  color: rgba(255,255,255,0.82);
  font-size: 1.0625rem;
  max-width: 520px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

.btn-cta-white {
  background: #fff;
  color: var(--accent);
  border: 2px solid #fff;
  font-weight: 700;
}

.btn-cta-white:hover {
  background: rgba(255,255,255,0.92);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.btn-cta-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.45);
  font-weight: 600;
}

.btn-cta-outline:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.08);
  transform: translateY(-2px);
}

/* ── Client Logos ────────────────────────────────────────────── */
.logo-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
  padding: 1rem 0;
}

.logo-item {
  height: 36px;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
}

.logo-item:hover {
  transform: translateY(-1px);
}

/* ── Footer ──────────────────────────────────────────────────── */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.footer-main {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr;
  gap: 3rem;
  padding: 4rem 0 3rem;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 1rem 0 1.5rem;
  max-width: 280px;
}

.social-links {
  display: flex;
  gap: 0.625rem;
}

.social-link {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: var(--transition);
}

.social-link:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-subtle);
}

.social-link svg { width: 16px; height: 16px; }

.footer-col h4 {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1.125rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: var(--transition);
  line-height: 1.5;
}

.footer-link:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-bottom a {
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-bottom a:hover { color: var(--accent); }

/* ── Divider ─────────────────────────────────────────────────── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}

/* ── Filter Tabs ─────────────────────────────────────────────── */
.filter-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.filter-tab {
  padding: 0.4375rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: var(--transition);
}

.filter-tab:hover,
.filter-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ── Forms ───────────────────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  font-family: inherit;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: var(--transition);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.dark .form-input:focus,
.dark .form-select:focus,
.dark .form-textarea:focus {
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder { color: var(--text-muted); }

.form-textarea { resize: vertical; min-height: 140px; }

/* ── Page Header ─────────────────────────────────────────────── */
.page-header {
  padding: calc(var(--nav-height) + 4rem) 0 4rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(var(--border-subtle) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-subtle) 1px, transparent 1px);
  background-size: 50px 50px;
  opacity: 0.5;
}

.page-header-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.page-header p {
  margin-top: 1rem;
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── Breadcrumb ──────────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  justify-content: center;
}

.breadcrumb a { color: var(--accent); transition: var(--transition); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb-sep { opacity: 0.5; }

/* ── Scroll Animations ───────────────────────────────────────── */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-delay-1 { transition-delay: 0.1s; }
.animate-delay-2 { transition-delay: 0.2s; }
.animate-delay-3 { transition-delay: 0.3s; }
.animate-delay-4 { transition-delay: 0.4s; }
.animate-delay-5 { transition-delay: 0.5s; }

/* ── Utility ─────────────────────────────────────────────────── */
.text-accent  { color: var(--accent); }
.text-muted   { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.bg-surface   { background: var(--surface); }
.bg-secondary { background: var(--bg-secondary); }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }

.tag {
  display: inline-flex;
  padding: 0.25rem 0.625rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.tag-blue  { background: var(--accent-light); color: var(--accent); }
.dark .tag-blue { background: rgba(59,130,246,0.12); }

.mono {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875em;
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-item:nth-child(2) { border-right: none; }
  .stat-item:nth-child(3) { border-top: 1px solid var(--border); }

  .footer-main {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .about-visual { display: none; }
}

@media (max-width: 768px) {
  :root { --nav-height: 64px; }

  .nav-links,
  .btn-nav { display: none; }

  .hamburger { display: flex; }

  .section { padding: 4rem 0; }

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

  .footer-main {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 3rem 0 2rem;
  }

  .footer-brand p { max-width: 100%; }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }

  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: 1fr; }

  .hero-stats {
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  .container { padding: 0 1rem; }
  .section { padding: 3rem 0; }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

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

/* ── 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-width: 0;
}

/* ── Focus styles for accessibility ──────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ── Skip link ───────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -40px;
  left: 1rem;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  z-index: 9999;
  transition: top 0.2s;
}

.skip-link:focus { top: 0; }

/* ── Video placeholder ───────────────────────────────────────── */
.video-placeholder {
  aspect-ratio: 16/9;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
}

.video-placeholder:hover .play-btn {
  transform: scale(1.1);
}

.play-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(37,99,235,0.4);
}

.play-btn svg { width: 24px; height: 24px; margin-left: 3px; }

/* ── Testimonials ────────────────────────────────────────────── */
.testimonial-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
}

.testimonial-quote {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.25rem;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.testimonial-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--accent-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}

.testimonial-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

.testimonial-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ── Team Cards ──────────────────────────────────────────────── */
.team-card {
  text-align: center;
  padding: 2rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.team-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.team-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--accent-subtle);
  border: 3px solid var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 auto 1rem;
}

.dark .team-avatar { border-color: rgba(59,130,246,0.2); }

.team-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.team-role {
  font-size: 0.8125rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.team-bio {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ── Research/Publication Cards ──────────────────────────────── */
.pub-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: var(--transition);
}

.pub-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.pub-type {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  background: var(--accent-subtle);
  color: var(--accent);
  border-radius: 4px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.pub-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.45;
  margin-bottom: 0.5rem;
}

.pub-authors {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 0.375rem;
}

.pub-venue {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: 1rem;
}

.pub-doi {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
}

.pub-doi svg { width: 13px; height: 13px; }

/* ── Training Cards ──────────────────────────────────────────── */
.training-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.training-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.training-header {
  background: var(--accent-subtle);
  padding: 1.5rem;
  border-bottom: 1px solid var(--accent-light);
}

.dark .training-header { border-color: rgba(59,130,246,0.15); }

.training-mode {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.375rem;
}

.training-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
}

.training-body {
  padding: 1.5rem;
}

.training-details {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.training-detail {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.training-detail svg { width: 14px; height: 14px; color: var(--accent); }

.training-fee {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.training-fee span {
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--text-muted);
}

/* ── 3D Portfolio ────────────────────────────────────────────── */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.portfolio-item {
  aspect-ratio: 4/3;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  transition: var(--transition);
}

.portfolio-item:hover {
  border-color: var(--accent);
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.portfolio-overlay {
  position: absolute;
  inset: 0;
  background: rgba(37, 99, 235, 0.85);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
  padding: 1.5rem;
  text-align: center;
}

.portfolio-item:hover .portfolio-overlay { opacity: 1; }

.portfolio-overlay h3 {
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.375rem;
}

.portfolio-overlay p {
  color: rgba(255,255,255,0.82);
  font-size: 0.8125rem;
}

.portfolio-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent-subtle) 0%, var(--bg-tertiary) 100%);
  color: var(--accent);
  opacity: 0.5;
}

.portfolio-placeholder svg { width: 40px; height: 40px; }

/* ── Contact ─────────────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
}

@media (max-width: 900px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.contact-info-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--accent-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.contact-info-icon svg { width: 20px; height: 20px; }

.contact-info-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.25rem;
}

.contact-info-value {
  font-size: 0.9375rem;
  color: var(--text-primary);
  font-weight: 500;
}

/* ── Map placeholder ─────────────────────────────────────────── */
.map-wrapper {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.map-wrapper iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* ── Highlight number counter ────────────────────────────────── */
.counter {
  display: inline-block;
  font-variant-numeric: tabular-nums;
}