/* ============================================================
   SANCHIT TIWARI — Premium Enterprise AI Leadership Platform
   Design System & Styles
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,300;0,14..32,400;0,14..32,500;0,14..32,600;0,14..32,700;1,14..32,400&display=swap');

/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  /* Color — Background */
  --bg:          #0b0b0e;
  --bg-2:        #0f0f13;
  --bg-3:        #131317;
  --bg-card:     #141418;
  --bg-card-2:   #18181d;

  /* Color — Border */
  --border:      #1e1e26;
  --border-2:    #28282f;
  --border-blue: rgba(92, 142, 246, 0.28);

  /* Color — Text */
  --text-1:  #e6e6ea;
  --text-2:  #8a8a96;
  --text-3:  #4c4c58;

  /* Color — Accent */
  --blue:       #5c8ef6;
  --blue-light: #7ba4f8;
  --blue-dim:   rgba(92, 142, 246, 0.09);
  --blue-dim-2: rgba(92, 142, 246, 0.16);

  /* Typography */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing */
  --nav-h:    68px;
  --max-w:    1160px;
  --pad-page: 120px 0;
  --pad-sm:   72px 0;

  /* Radius */
  --r-sm:  6px;
  --r-md:  10px;
  --r-lg:  16px;

  /* Transitions */
  --ease:   cubic-bezier(0.16, 1, 0.3, 1);
  --ease-2: cubic-bezier(0.4, 0, 0.2, 1);
  --t1: 150ms;
  --t2: 280ms;
  --t3: 480ms;

  /* Shadows */
  --shadow-card:  0 1px 2px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.03);
  --shadow-lift:  0 4px 24px rgba(0,0,0,0.45), 0 0 0 1px rgba(92,142,246,0.12);
  --shadow-blue:  0 0 0 1px rgba(92,142,246,0.3), 0 4px 24px rgba(92,142,246,0.08);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-1);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a     { color: inherit; text-decoration: none; }
img   { max-width: 100%; display: block; }
ul    { list-style: none; }
input, textarea, button { font-family: inherit; }
button { cursor: pointer; border: none; background: none; }

/* ============================================================
   LAYOUT UTILITIES
   ============================================================ */
.container {
  width: min(var(--max-w), 100% - 48px);
  margin-inline: auto;
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ============================================================
   PAGE ROUTING
   ============================================================ */
.page {
  display: none;
  min-height: calc(100vh - var(--nav-h));
}
.page.active {
  display: block;
  animation: pageIn var(--t3) var(--ease) both;
}
@keyframes pageIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   NAVIGATION
   ============================================================ */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t2) var(--ease-2),
              background var(--t2) var(--ease-2),
              backdrop-filter var(--t2) var(--ease-2);
}
#nav.scrolled {
  background: rgba(11, 11, 14, 0.88);
  backdrop-filter: blur(16px) saturate(1.2);
  border-bottom-color: var(--border);
}
.nav-inner {
  width: min(var(--max-w), 100% - 48px);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}
.nav-monogram {
  width: 34px; height: 34px;
  background: var(--blue-dim);
  border: 1px solid var(--border-blue);
  border-radius: var(--r-sm);
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  letter-spacing: 0.02em;
  flex-shrink: 0;
}
.nav-name {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-1);
  letter-spacing: -0.01em;
}
.nav-title {
  font-size: 11.5px;
  color: var(--text-3);
  font-weight: 400;
  margin-top: 1px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-link {
  padding: 7px 14px;
  font-size: 13.5px;
  font-weight: 450;
  color: var(--text-2);
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: color var(--t1), background var(--t1);
  letter-spacing: 0.005em;
}
.nav-link:hover { color: var(--text-1); background: rgba(255,255,255,0.04); }
.nav-link.active { color: var(--text-1); }
.nav-cta {
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 500;
  color: var(--blue);
  border: 1px solid var(--border-blue);
  border-radius: var(--r-sm);
  background: var(--blue-dim);
  cursor: pointer;
  transition: all var(--t1) var(--ease);
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.nav-cta:hover {
  background: var(--blue-dim-2);
  border-color: rgba(92,142,246,0.45);
  color: var(--blue-light);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  width: 22px; height: 1.5px;
  background: var(--text-2);
  border-radius: 2px;
  transition: all var(--t2);
}

/* Mobile menu */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-h); left: 0; right: 0;
  background: rgba(11, 11, 14, 0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 24px;
  flex-direction: column;
  gap: 4px;
  z-index: 99;
}
.nav-mobile.open { display: flex; }
.nav-mobile .nav-link {
  padding: 12px 16px;
  font-size: 15px;
  border-radius: var(--r-md);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--r-md);
  cursor: pointer;
  transition: all var(--t2) var(--ease);
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.btn-primary {
  background: var(--blue);
  color: #fff;
  border: 1px solid transparent;
}
.btn-primary:hover {
  background: var(--blue-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(92,142,246,0.3);
}
.btn-secondary {
  background: rgba(255,255,255,0.05);
  color: var(--text-1);
  border: 1px solid var(--border-2);
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--border-blue);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  color: var(--text-1);
  border-color: var(--border-2);
  background: rgba(255,255,255,0.03);
}
.btn-outline-blue {
  background: var(--blue-dim);
  color: var(--blue);
  border: 1px solid var(--border-blue);
}
.btn-outline-blue:hover {
  background: var(--blue-dim-2);
  border-color: rgba(92,142,246,0.45);
  transform: translateY(-1px);
}
.btn-lg { padding: 16px 36px; font-size: 15px; }
.btn-sm { padding: 9px 20px; font-size: 13px; }

/* ============================================================
   TYPOGRAPHY UTILITIES
   ============================================================ */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11.5px;
  font-weight: 500;
  color: var(--blue);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.eyebrow::before {
  content: '';
  display: block;
  width: 20px; height: 1px;
  background: var(--blue);
  opacity: 0.6;
}
.section-headline {
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 600;
  color: var(--text-1);
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.section-sub {
  font-size: 17px;
  color: var(--text-2);
  line-height: 1.7;
  font-weight: 400;
  max-width: 560px;
  margin-top: 16px;
}
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 0;
}

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 32px;
  transition: all var(--t2) var(--ease);
  box-shadow: var(--shadow-card);
}
.card:hover {
  border-color: var(--border-blue);
  box-shadow: var(--shadow-lift);
  transform: translateY(-2px);
}
.card-icon {
  width: 40px; height: 40px;
  background: var(--blue-dim);
  border: 1px solid var(--border-blue);
  border-radius: var(--r-sm);
  display: grid;
  place-items: center;
  font-size: 18px;
  margin-bottom: 20px;
}
.card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}
.card-body {
  font-size: 14.5px;
  color: var(--text-2);
  line-height: 1.7;
}

/* ============================================================
   FADE-IN ANIMATION (via IntersectionObserver)
   ============================================================ */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--t3) var(--ease), transform var(--t3) var(--ease);
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-up:nth-child(2) { transition-delay: 80ms; }
.fade-up:nth-child(3) { transition-delay: 160ms; }
.fade-up:nth-child(4) { transition-delay: 240ms; }
.fade-up:nth-child(5) { transition-delay: 320ms; }
.fade-up:nth-child(6) { transition-delay: 400ms; }

/* ============================================================
   SECTION WRAPPER
   ============================================================ */
.section { padding: var(--pad-page); }
.section-sm { padding: var(--pad-sm); }
.section-header { margin-bottom: 56px; }
.section-header.center { text-align: center; }
.section-header.center .section-sub { margin-inline: auto; }
.section-header.center .eyebrow { justify-content: center; }

/* ============================================================
   HOME — HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
#hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}
.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 50% 40%, rgba(92,142,246,0.05) 0%, transparent 70%),
    radial-gradient(ellipse 40% 50% at 20% 80%, rgba(92,142,246,0.03) 0%, transparent 60%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  padding-top: calc(var(--nav-h) + 48px);
  padding-bottom: 100px;
  z-index: 2;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--blue);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 28px;
  padding: 7px 16px;
  background: var(--blue-dim);
  border: 1px solid var(--border-blue);
  border-radius: 100px;
}
.hero-eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--blue);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--blue);
}
.hero-headline {
  font-size: clamp(52px, 7.5vw, 88px);
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.04em;
  line-height: 1.04;
  max-width: 820px;
  margin-bottom: 28px;
}
.hero-headline .accent { color: var(--blue); }
.hero-sub {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-2);
  line-height: 1.7;
  max-width: 560px;
  font-weight: 400;
  margin-bottom: 48px;
}
.hero-ctas {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.hero-scroll {
  position: absolute;
  bottom: 40px; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0.4;
  animation: scrollBounce 2s ease-in-out infinite;
}
.hero-scroll-line {
  width: 1px; height: 48px;
  background: linear-gradient(180deg, transparent, var(--text-2));
}
@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(6px); }
}

/* ============================================================
   HOME — WHO HE IS
   ============================================================ */
.hybrid-section { padding: var(--pad-page); background: var(--bg-2); }

/* ============================================================
   HOME — FOCUS AREAS
   ============================================================ */
.focus-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.focus-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 13.5px;
  font-weight: 450;
  color: var(--text-2);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  transition: all var(--t2) var(--ease);
}
.focus-tag:hover {
  color: var(--blue);
  border-color: var(--border-blue);
  background: var(--blue-dim);
}
.focus-tag-dot {
  width: 5px; height: 5px;
  background: var(--blue);
  border-radius: 50%;
  opacity: 0.5;
}

/* ============================================================
   HOME — CREDENTIALS / STATS
   ============================================================ */
.stats-section {
  padding: var(--pad-page);
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stat-card {
  text-align: center;
  padding: 36px 24px;
  border-right: 1px solid var(--border);
}
.stat-card:last-child { border-right: none; }
.stat-number {
  font-size: clamp(36px, 4vw, 52px);
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-number span { color: var(--blue); }
.stat-label {
  font-size: 14px;
  color: var(--text-2);
  font-weight: 400;
  line-height: 1.5;
  max-width: 160px;
  margin-inline: auto;
}

/* ============================================================
   HOME — EXPERIENCE TIMELINE
   ============================================================ */
.experience-section { padding: var(--pad-page); }
.timeline {
  position: relative;
  padding-top: 8px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 16px; bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--border-2) 15%, var(--border-2) 85%, transparent);
}
.timeline-item {
  position: relative;
  padding: 0 0 40px 48px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -5px;
  top: 5px;
  width: 11px; height: 11px;
  background: var(--bg);
  border: 2px solid var(--border-2);
  border-radius: 50%;
  transition: all var(--t2);
}
.timeline-item:hover .timeline-dot {
  border-color: var(--blue);
  background: var(--blue-dim);
  box-shadow: 0 0 12px rgba(92,142,246,0.3);
}
.timeline-meta {
  font-size: 12px;
  color: var(--text-3);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.timeline-company {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-1);
  letter-spacing: -0.02em;
  margin-bottom: 2px;
}
.timeline-role {
  font-size: 14px;
  color: var(--text-2);
}

/* ============================================================
   HOME — FEATURED THINKING
   ============================================================ */
.thinking-section { padding: var(--pad-page); background: var(--bg-2); }
.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 28px;
  cursor: pointer;
  transition: all var(--t2) var(--ease);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.article-card:hover {
  border-color: var(--border-blue);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-3);
  font-weight: 500;
}
.article-tag {
  font-size: 11px;
  color: var(--blue);
  background: var(--blue-dim);
  border: 1px solid rgba(92,142,246,0.15);
  padding: 3px 10px;
  border-radius: 100px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.article-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
  letter-spacing: -0.02em;
  line-height: 1.4;
}
.article-excerpt {
  font-size: 13.5px;
  color: var(--text-2);
  line-height: 1.65;
  flex: 1;
}
.article-link {
  font-size: 13px;
  color: var(--blue);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
}
.article-link::after { content: '→'; }

/* ============================================================
   HOME — CTA STRIP
   ============================================================ */
.cta-strip {
  padding: 100px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-strip::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 50% 50%, rgba(92,142,246,0.06), transparent);
  pointer-events: none;
}
.cta-strip-headline {
  font-size: clamp(26px, 3.5vw, 40px);
  font-weight: 600;
  color: var(--text-1);
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  max-width: 600px;
  margin-inline: auto;
}
.cta-strip-sub {
  font-size: 16px;
  color: var(--text-2);
  margin-bottom: 40px;
}
.cta-strip-btns {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   INSIGHTS PAGE
   ============================================================ */
.progress-bar {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  height: 2px;
  background: var(--blue);
  z-index: 90;
  transition: width 50ms linear;
  transform-origin: left;
  box-shadow: 0 0 8px rgba(92,142,246,0.5);
}
.insights-header {
  padding: calc(var(--nav-h) + 72px) 0 72px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
}
.category-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 36px;
}
.cat-btn {
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 450;
  color: var(--text-2);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--t1);
}
.cat-btn:hover, .cat-btn.active {
  color: var(--blue);
  background: var(--blue-dim);
  border-color: var(--border-blue);
}
.insights-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 72px 0 120px;
}
.insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--t2) var(--ease);
  display: flex;
  flex-direction: column;
}
.insight-card:hover {
  border-color: var(--border-blue);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}
.insight-card-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1;
}
.insight-card-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--text-3);
}
.insight-card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-1);
  letter-spacing: -0.02em;
  line-height: 1.4;
}
.insight-card-excerpt {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
  flex: 1;
}
.insight-card-footer {
  padding: 18px 28px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
}
.read-time { color: var(--text-3); }
.read-more {
  color: var(--blue);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ============================================================
   LAB PAGE
   ============================================================ */
.lab-header {
  padding: calc(var(--nav-h) + 72px) 0 80px;
  border-bottom: 1px solid var(--border);
}
.lab-headline {
  font-size: clamp(42px, 6vw, 68px);
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.04em;
  line-height: 1.06;
  margin-bottom: 20px;
}
.lab-sub {
  font-size: 18px;
  color: var(--text-2);
  max-width: 520px;
}
.lab-journal {
  padding: 80px 0 120px;
}
.lab-timeline { max-width: 760px; }
.lab-entry {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 32px;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
  transition: all var(--t2);
}
.lab-entry:first-child { padding-top: 0; border-top: 1px solid var(--border); }
.lab-entry:hover .lab-entry-title { color: var(--blue); }
.lab-date {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-3);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding-top: 3px;
  line-height: 1.5;
}
.lab-date strong {
  display: block;
  font-size: 13px;
  color: var(--text-2);
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0;
  margin-bottom: 2px;
}
.lab-entry-tag {
  display: inline-flex;
  font-size: 11px;
  color: var(--blue);
  background: var(--blue-dim);
  border: 1px solid rgba(92,142,246,0.2);
  padding: 3px 9px;
  border-radius: 100px;
  font-weight: 500;
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}
.lab-entry-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-1);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  transition: color var(--t1);
  line-height: 1.4;
}
.lab-entry-body {
  font-size: 14.5px;
  color: var(--text-2);
  line-height: 1.7;
}

/* ============================================================
   SPEAKING PAGE
   ============================================================ */
.speaking-header {
  padding: calc(var(--nav-h) + 72px) 0 80px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
}
.speaking-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 80px;
  padding: 80px 0 120px;
  align-items: start;
}
.topics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 36px;
}
.topic-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 22px 24px;
  transition: all var(--t2) var(--ease);
}
.topic-card:hover {
  border-color: var(--border-blue);
  background: var(--bg-card-2);
}
.topic-number {
  font-size: 11px;
  color: var(--blue);
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
  opacity: 0.7;
}
.topic-title {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-1);
  letter-spacing: -0.015em;
  line-height: 1.4;
}
.formats-section { margin-top: 52px; }
.formats-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.formats-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.format-chip {
  padding: 7px 16px;
  font-size: 13px;
  color: var(--text-2);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
}
.speaking-sidebar { position: sticky; top: calc(var(--nav-h) + 40px); }
.bio-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 36px;
}
.bio-avatar {
  width: 64px; height: 64px;
  background: linear-gradient(135deg, var(--blue-dim), rgba(92,142,246,0.2));
  border: 2px solid var(--border-blue);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 24px;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.bio-name {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}
.bio-role {
  font-size: 13px;
  color: var(--text-2);
  margin-bottom: 20px;
}
.bio-text {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 28px;
}
.bio-divider {
  height: 1px;
  background: var(--border);
  margin: 24px 0;
}
.inquiry-form { display: flex; flex-direction: column; gap: 14px; }
.form-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-3);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 6px;
  display: block;
}
.form-input, .form-textarea, .form-select {
  width: 100%;
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  border-radius: var(--r-sm);
  padding: 12px 16px;
  font-size: 14px;
  color: var(--text-1);
  outline: none;
  transition: border-color var(--t1);
  -webkit-appearance: none;
}
.form-input::placeholder,
.form-textarea::placeholder { color: var(--text-3); }
.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(92,142,246,0.1);
}
.form-textarea { resize: vertical; min-height: 100px; }
.form-group { display: flex; flex-direction: column; }

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.about-header {
  padding: calc(var(--nav-h) + 72px) 0 0;
}
.about-hero-grid {
  display: grid;
  grid-template-columns: 1fr 440px;
  gap: 80px;
  align-items: start;
  padding-bottom: 80px;
  border-bottom: 1px solid var(--border);
}
.about-headline {
  font-size: clamp(40px, 5.5vw, 64px);
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.04em;
  line-height: 1.08;
  margin-bottom: 28px;
}
.about-narrative p {
  font-size: 17px;
  color: var(--text-2);
  line-height: 1.8;
  margin-bottom: 24px;
}
.about-narrative p:last-child { margin-bottom: 0; }
.about-sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 36px;
  position: sticky;
  top: calc(var(--nav-h) + 40px);
}
.about-sidebar-label {
  font-size: 11px;
  color: var(--text-3);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.about-detail-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.about-detail-row:last-child { border-bottom: none; }
.about-detail-icon { font-size: 16px; opacity: 0.7; flex-shrink: 0; margin-top: 1px; }
.about-detail-key {
  font-size: 12px;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 500;
  margin-bottom: 2px;
}
.about-detail-val {
  font-size: 14px;
  color: var(--text-1);
  font-weight: 500;
}
.about-detail-sub {
  font-size: 12.5px;
  color: var(--text-2);
}
.expertise-section {
  padding: 80px 0 120px;
}
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.expertise-item {
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  transition: all var(--t2) var(--ease);
}
.expertise-item:hover {
  border-color: var(--border-blue);
  background: var(--bg-card-2);
}
.expertise-area {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
  letter-spacing: -0.015em;
  margin-bottom: 8px;
}
.expertise-desc {
  font-size: 13.5px;
  color: var(--text-2);
  line-height: 1.6;
}

/* ============================================================
   CONTACT PAGE
   ============================================================ */
.contact-page {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.contact-left {
  padding: calc(var(--nav-h) + 80px) 80px 80px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.contact-right {
  padding: calc(var(--nav-h) + 80px) 80px 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--bg-2);
}
.contact-headline {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 20px;
}
.contact-sub {
  font-size: 17px;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 48px;
  max-width: 420px;
}
.contact-links { display: flex; flex-direction: column; gap: 16px; }
.contact-link-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  cursor: pointer;
  transition: all var(--t2) var(--ease);
}
.contact-link-item:hover {
  border-color: var(--border-blue);
  transform: translateX(4px);
}
.contact-link-icon {
  width: 40px; height: 40px;
  background: var(--blue-dim);
  border: 1px solid var(--border-blue);
  border-radius: var(--r-sm);
  display: grid;
  place-items: center;
  font-size: 17px;
  flex-shrink: 0;
}
.contact-link-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 2px;
}
.contact-link-sub { font-size: 12.5px; color: var(--text-2); }
.contact-form { display: flex; flex-direction: column; gap: 18px; }
.contact-form-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-1);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.contact-form-sub {
  font-size: 14.5px;
  color: var(--text-2);
  margin-bottom: 32px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.success-msg {
  display: none;
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 0.25);
  border-radius: var(--r-md);
  padding: 20px 24px;
  color: #4ade80;
  font-size: 14px;
  font-weight: 500;
}
.success-msg.show { display: block; }

/* ============================================================
   ARTICLE READER PAGE
   ============================================================ */
.article-back-bar {
  position: sticky;
  top: var(--nav-h);
  z-index: 50;
  background: rgba(11,11,14,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.article-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
  cursor: pointer;
  transition: color var(--t1);
  background: none;
  border: none;
}
.article-back:hover { color: var(--text-1); }
.article-reader {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 0 120px;
}
.article-reader-header { margin-bottom: 40px; }
.article-reader-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.article-meta-sep { color: var(--border-2); }
.article-reader-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 28px;
}
.article-reader-byline {
  display: flex;
  align-items: center;
  gap: 14px;
}
.byline-avatar {
  width: 40px; height: 40px;
  background: var(--blue-dim);
  border: 1px solid var(--border-blue);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--blue);
  flex-shrink: 0;
}
.byline-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 2px;
}
.byline-role {
  font-size: 12px;
  color: var(--text-2);
}
.article-divider {
  height: 1px;
  background: var(--border);
  margin: 40px 0;
}
/* Article body typography */
.article-body h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.025em;
  line-height: 1.3;
  margin: 44px 0 16px;
}
.article-body p {
  font-size: 17px;
  color: var(--text-2);
  line-height: 1.82;
  margin-bottom: 20px;
}
.article-body strong {
  color: var(--text-1);
  font-weight: 600;
}
.article-body ul {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.article-body ul li {
  font-size: 17px;
  color: var(--text-2);
  line-height: 1.7;
  padding-left: 20px;
  position: relative;
}
.article-body ul li::before {
  content: '·';
  position: absolute;
  left: 4px;
  color: var(--blue);
  font-size: 20px;
  line-height: 1.4;
}
.article-footer { }
.article-footer-note {
  font-size: 14px;
  color: var(--text-3);
  line-height: 1.7;
  margin-bottom: 28px;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  border-left: 3px solid var(--border-blue);
}
.article-footer-ctas {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  border-top: 1px solid var(--border);
  padding: 48px 0;
  background: var(--bg-2);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-link {
  font-size: 13px;
  color: var(--text-3);
  cursor: pointer;
  transition: color var(--t1);
}
.footer-link:hover { color: var(--text-2); }
.footer-copy {
  font-size: 12.5px;
  color: var(--text-3);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  :root { --max-w: 960px; }
  .speaking-grid { grid-template-columns: 1fr; gap: 48px; }
  .speaking-sidebar { position: static; }
  .about-hero-grid { grid-template-columns: 1fr; }
  .about-sidebar-card { position: static; }
  .insights-grid { grid-template-columns: 1fr 1fr; }
  .expertise-grid { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .stat-card { border-right: none; border-bottom: 1px solid var(--border); }
  .stat-card:last-child { border-bottom: none; }
}

@media (max-width: 768px) {
  :root {
    --pad-page: 72px 0;
    --pad-sm:   48px 0;
  }
  .nav-links, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .topics-grid { grid-template-columns: 1fr; }
  .insights-grid { grid-template-columns: 1fr; }
  .expertise-grid { grid-template-columns: 1fr; }
  .contact-page { grid-template-columns: 1fr; }
  .contact-left, .contact-right { padding: 48px 24px; }
  .contact-left { padding-top: calc(var(--nav-h) + 48px); }
  .form-row { grid-template-columns: 1fr; }
  .hero-ctas { flex-direction: column; align-items: flex-start; }
  .lab-entry { grid-template-columns: 1fr; gap: 12px; }
  .footer-inner { flex-direction: column; gap: 24px; text-align: center; }
  .footer-links { flex-wrap: wrap; justify-content: center; }
}

@media (max-width: 480px) {
  .container { width: calc(100% - 32px); }
  .hero-headline { font-size: 42px; }
  .cta-strip-btns { flex-direction: column; align-items: center; }
}