/* ============================================================
   Pallavi Verma — Portfolio
   Dark theme · hash-routed SPA · responsive
   ============================================================ */

:root {
  --bg: #0a0f1c;
  --bg-2: #0e1626;
  --bg-3: #131c30;
  --line: #1d2942;
  --line-soft: #182238;
  --text: #d6deea;
  --text-dim: #8a98b2;
  --text-soft: #6a7895;
  --accent: #22d3ee;
  --accent-2: #ffb86b;
  --accent-soft: rgba(34, 211, 238, 0.1);
  --danger: #ff7a7a;
  --radius: 10px;
  --radius-lg: 16px;
  --max: 1120px;
  --pad-x: clamp(20px, 4vw, 56px);
  --shadow: 0 10px 30px -15px rgba(0, 0, 0, 0.7);
  --shadow-lift: 0 20px 50px -20px rgba(0, 0, 0, 0.85);
  --t: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --t-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Playfair Display', 'Inter', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  overflow-x: hidden;
  max-width: 100vw;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  max-width: 100vw;
}
img, video, iframe { max-width: 100%; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--t), opacity var(--t);
}
a:hover { color: var(--accent); opacity: 0.85; }

em {
  font-style: italic;
  color: var(--accent);
  font-family: var(--font-display);
  font-weight: 500;
}

code {
  font-family: var(--font-mono);
  background: var(--bg-3);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--accent);
}

/* ---------- Background ---------- */

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(34, 211, 238, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.035) 1px, transparent 1px);
  background-size: 60px 60px;
  background-position: center center;
  mask-image: radial-gradient(ellipse 100% 60% at 50% 0%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 100% 60% at 50% 0%, black 30%, transparent 80%);
}

.bg-glow {
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 80vw;
  max-width: 1200px;
  height: 700px;
  background: radial-gradient(ellipse at center,
    rgba(34, 211, 238, 0.08) 0%,
    rgba(34, 211, 238, 0.03) 30%,
    transparent 70%);
  z-index: -1;
  pointer-events: none;
  filter: blur(40px);
}

/* ---------- Nav ---------- */

.nav-wrap {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(10, 15, 28, 0.7);
  border-bottom: 1px solid var(--line-soft);
}

.nav {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px var(--pad-x);
  display: flex;
  align-items: center;
  gap: 24px;
  min-width: 0;
}
.nav-wrap { max-width: 100vw; }

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 600;
}
.brand:hover { color: var(--text); }
.brand-mark {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: var(--bg-3);
  border-radius: 8px;
  transition: transform var(--t), background var(--t);
}
.brand-mark-text {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.05em;
  color: var(--text);
  line-height: 1;
}
.brand-mark-dot {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.5);
  animation: pulse 2.4s ease infinite;
}
.brand:hover .brand-mark { transform: translateY(-2px); background: var(--accent-soft); }
.brand:hover .brand-mark-text { color: var(--accent); }
.brand-name {
  font-size: 15px;
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  list-style: none;
  margin: 0 0 0 auto;
  padding: 0;
  gap: 4px;
}
.nav-links a {
  color: var(--text-dim);
  font-size: 14px;
  padding: 8px 14px;
  border-radius: 6px;
  font-weight: 500;
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: color var(--t), background var(--t);
}
.nav-links a:hover { color: var(--accent); background: var(--accent-soft); }
.nav-links a.is-active { color: var(--accent); background: var(--accent-soft); }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 8px 16px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  color: var(--accent);
  transition: background var(--t), transform var(--t);
}
.nav-cta:hover {
  background: var(--accent-soft);
  transform: translateY(-1px);
  color: var(--accent);
}

/* Hidden checkbox is the state-holder for the mobile menu */
.nav-check {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  width: 36px;
  height: 36px;
  flex-direction: column;
  gap: 5px;
  justify-content: center;
  margin-left: auto;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--accent);
  transition: transform var(--t), opacity var(--t);
  pointer-events: none;
}

/* ---------- View routing ---------- */

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.view {
  display: none;
  padding: 80px 0 100px;
  animation: viewIn 0.5s ease;
}
.view.is-active { display: block; }

@keyframes viewIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Common section bits ---------- */

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.section-eyebrow::before {
  content: '';
  width: 28px;
  height: 1px;
  background: var(--accent);
  opacity: 0.6;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.1;
  margin: 0 0 24px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text);
}

.sub-title {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  margin: 0 0 20px;
  font-weight: 500;
  color: var(--text);
}

.section-lede {
  max-width: 680px;
  color: var(--text-dim);
  font-size: 17px;
  margin: 0 0 40px;
}

/* ---------- Hero ---------- */

.hero {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  grid-template-areas:
    "eyebrow ."
    "title   photo"
    "detail  detail";
  gap: 0 60px;
  row-gap: 8px;
  align-items: start;
  min-height: calc(100vh - 200px);
  padding: 40px 0;
}
.hero .hero-eyebrow { grid-area: eyebrow; }
.hero .hero-title   { grid-area: title; align-self: start; }
.hero-photo         { grid-area: photo; align-self: start; }
.hero-detail        { grid-area: detail; max-width: 720px; margin-top: 24px; }

.hero-eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 15px;
  margin: 0 0 16px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 4.6vw, 56px);
  line-height: 1.15;
  margin: 0 0 28px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text);
}

.hero-sub {
  font-size: 18px;
  color: var(--text-dim);
  max-width: 580px;
  margin: 0 0 24px;
  line-height: 1.7;
}

.hero-now {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-dim);
  font-size: 14px;
  margin: 0 0 36px;
  font-family: var(--font-mono);
}
.hero-now strong { color: var(--accent); font-weight: 500; }

.now-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 0 var(--accent);
  animation: pulse 2.2s ease infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.4); }
  50%      { box-shadow: 0 0 0 8px rgba(34, 211, 238, 0); }
}

.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  transition: transform var(--t), background var(--t), border-color var(--t);
  border: 1.5px solid transparent;
  cursor: pointer;
}
.btn-primary {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}
.btn-primary:hover {
  background: rgba(34, 211, 238, 0.18);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.btn-ghost {
  border-color: var(--line);
  color: var(--text-dim);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.hero-photo { display: flex; justify-content: center; }
.photo-frame {
  position: relative;
  width: 100%;
  max-width: 340px;
  aspect-ratio: 3 / 4;
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--t);
}
.photo-frame::before {
  content: '';
  position: absolute;
  inset: -12px;
  border: 2px solid var(--accent);
  border-radius: var(--radius-lg);
  transform: translate(14px, 14px);
  transition: transform var(--t);
  z-index: 1;
  pointer-events: none;
}
.photo-frame:hover { transform: translateY(-4px); }
.photo-frame:hover::before { transform: translate(8px, 8px); }
.photo-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.15) contrast(1.02);
  transition: filter var(--t);
}
.photo-frame:hover img { filter: none; }

/* ---------- Stats block (Connect-style) ---------- */

.stats {
  margin: 100px 0 80px;
  padding: 60px 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px 48px;
  margin-top: 32px;
}

.stat { padding: 12px 0; }
.stat-num {
  font-family: var(--font-display);
  font-size: clamp(38px, 4.5vw, 56px);
  line-height: 1;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.stat-label {
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
  font-weight: 500;
}
.stat-label span {
  display: block;
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 400;
  margin-top: 4px;
}

/* ---------- Pillars ---------- */

.pillars { margin-top: 80px; }
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}
.pillar {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: transform var(--t), border-color var(--t), background var(--t);
}
.pillar:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  background: var(--bg-3);
}
.pillar-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}
.pillar h3 {
  font-family: var(--font-display);
  font-size: 22px;
  margin: 0 0 12px;
  font-weight: 500;
  color: var(--text);
}
.pillar p {
  color: var(--text-dim);
  font-size: 15px;
  margin: 0;
}

/* ---------- About ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 50px;
  margin-top: 16px;
}
.about-text p {
  color: var(--text-dim);
  font-size: 17px;
  line-height: 1.75;
  margin: 0 0 18px;
}
.about-text strong { color: var(--text); font-weight: 600; }

.about-side { display: flex; flex-direction: column; gap: 16px; }
.side-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.side-card h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 8px;
  font-weight: 500;
}
.side-card p { margin: 0; color: var(--text); font-size: 15px; line-height: 1.5; }
.side-card span { color: var(--text-soft); font-size: 13px; }

.toolkit {
  margin-top: 80px;
  padding-top: 50px;
  border-top: 1px solid var(--line-soft);
}
.toolkit .sub-title { margin-bottom: 8px; }
.toolkit .section-lede { margin-bottom: 32px; }
.toolkit-groups {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  align-items: start;
}
.toolkit-stack {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.toolkit-group {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px 24px;
  transition: border-color var(--t);
}
.toolkit-group:hover { border-color: var(--accent); }
.toolkit-group h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 14px;
  font-weight: 500;
}

.leadership { margin-top: 80px; }
.leadership-list { list-style: none; padding: 0; margin: 16px 0 0; }
.leadership-list li {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
  align-items: baseline;
}
.lead-when {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-soft);
  letter-spacing: 0.02em;
}
.lead-what strong { color: var(--text); font-weight: 600; }
.lead-what { color: var(--text-dim); font-size: 16px; }

/* ---------- Experience (tabbed) ---------- */

.exp {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 40px;
  margin-top: 16px;
}
.exp-tabs {
  display: flex;
  flex-direction: column;
  border-left: 2px solid var(--line);
  position: relative;
}
.exp-tab {
  background: none;
  border: none;
  border-left: 2px solid transparent;
  margin-left: -2px;
  padding: 12px 20px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-dim);
  cursor: pointer;
  letter-spacing: 0.03em;
  transition: color var(--t), background var(--t), border-color var(--t);
}
.exp-tab:hover { color: var(--accent); background: var(--accent-soft); }
.exp-tab.is-active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-soft);
}

.exp-panel { display: none; animation: viewIn 0.4s ease; }
.exp-panel.is-active { display: block; }

.exp-panel h3 {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.8vw, 28px);
  margin: 0 0 6px;
  font-weight: 500;
  color: var(--text);
}
.exp-at { color: var(--accent); }
.exp-meta {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-soft);
  margin: 0 0 20px;
}
.exp-panel ul {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
}
.exp-panel ul li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 14px;
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.65;
}
.exp-panel ul li::before {
  content: '▹';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent);
}
.exp-panel ul li strong { color: var(--text); font-weight: 600; }

.exp-tools {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-soft);
  margin: 16px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}
.exp-tools span { color: var(--accent); margin-right: 8px; }

.tools-strip {
  margin-top: 80px;
  padding-top: 50px;
  border-top: 1px solid var(--line-soft);
}
.tools-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}
.tools-list span {
  padding: 6px 14px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-dim);
  transition: border-color var(--t), color var(--t);
}
.tools-list span:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Programs ---------- */

.programs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.program {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 36px 38px;
  transition: transform var(--t), border-color var(--t);
}
.program:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}
.program-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.program-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 999px;
}
.program-tag-soft {
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--line);
}
.program-tag-status {
  color: var(--accent-2);
  background: rgba(255, 184, 107, 0.08);
  border: 1px solid rgba(255, 184, 107, 0.3);
}

.program-scale {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px 24px;
  margin: 20px 0 22px;
  padding: 18px 22px;
  background: var(--bg-3);
  border-radius: 10px;
  border: 1px solid var(--line-soft);
}
.program-scale > div {
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.program-scale span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-soft);
  font-weight: 400;
}

.program-h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 22px 0 10px;
  font-weight: 500;
}
.program-roles {
  list-style: none;
  padding: 0;
  margin: 0 0 8px;
}
.program-roles li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 10px;
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.65;
}
.program-roles li::before {
  content: '▹';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent);
}
.program-roles li strong { color: var(--text); font-weight: 600; }
.program h3 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 30px);
  font-weight: 500;
  margin: 0 0 8px;
  color: var(--text);
}
.program-where {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-soft);
  margin: 0 0 18px;
}
.program p {
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.7;
  margin: 0 0 14px;
}
.program p strong { color: var(--text); font-weight: 600; }

/* ---------- AI Bot ---------- */

.bot-source {
  margin: -12px 0 32px;
  font-family: var(--font-mono);
  font-size: 13px;
}
.bot-source a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
  background: transparent;
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: background var(--t), transform var(--t);
}
.bot-source a:hover {
  background: var(--accent-soft);
  transform: translateY(-1px);
}
.bot-source-icon {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: -0.05em;
  opacity: 0.85;
}
.bot-source-arrow {
  transition: transform var(--t);
}
.bot-source a:hover .bot-source-arrow {
  transform: translateX(3px);
}

.bot-story {
  background: var(--bg-2);
  border-left: 3px solid var(--accent);
  padding: 24px 28px;
  border-radius: 4px;
  margin-bottom: 40px;
}
.bot-story p {
  color: var(--text-dim);
  font-size: 17px;
  line-height: 1.7;
  margin: 0 0 14px;
}
.bot-story p:last-child { margin-bottom: 0; }
.bot-story strong { color: var(--text); }

.bot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 40px;
}
.bot-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--t), transform var(--t);
}
.bot-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.bot-card-wide { grid-column: 1 / -1; }
.bot-card h4 {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 16px;
  font-weight: 500;
}
.bot-card ol, .bot-card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--text-dim);
}
.bot-card ol li, .bot-card ul li {
  margin-bottom: 8px;
  line-height: 1.6;
}
.bot-card p {
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.7;
  margin: 0;
}
.bot-card p strong { color: var(--text); }

.bot-stack { list-style: none; padding: 0; }
.bot-stack li {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--text-dim);
}
.bot-stack li:last-child { border-bottom: none; }
.bot-stack li span {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.03em;
}

/* Architecture diagram */
.bot-architecture {
  background: var(--bg-2);
  border: 1px dashed var(--line);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 40px;
}
.bot-architecture h4 {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 24px;
  font-weight: 500;
}
.arch-diagram {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}
.arch-row {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}
.arch-box {
  background: var(--bg-3);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text);
  text-align: center;
  min-width: 140px;
  transition: border-color var(--t), transform var(--t);
}
.arch-box:hover { border-color: var(--accent); transform: translateY(-2px); }
.arch-box span { display: block; font-size: 11px; color: var(--text-soft); margin-top: 4px; font-weight: 400; }
.arch-box.arch-orch {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
  min-width: 280px;
}
.arch-box.arch-ai {
  border-color: var(--accent-2);
  color: var(--accent-2);
  background: rgba(255, 184, 107, 0.08);
  min-width: 280px;
}
.arch-box.arch-or { border-style: dashed; }
.arch-arrow, .arch-down {
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 18px;
}
.arch-spacer { flex: 1; max-width: 100px; }

.bot-shots { margin-bottom: 40px; }
.bot-shots h4 {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 16px;
  font-weight: 500;
}
.shots-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.shot-placeholder {
  background: var(--bg-2);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  text-align: center;
  padding: 16px;
}
.shot-frame {
  aspect-ratio: 16 / 10;
  background: var(--bg-3);
  border-radius: 6px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-soft);
  margin-bottom: 10px;
}
.shot-placeholder p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-soft);
}

.bot-lessons {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 40px;
}
.bot-lessons h4 {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 20px;
  font-weight: 500;
}
.bot-lessons ol {
  padding-left: 20px;
  color: var(--text-dim);
  margin: 0;
}
.bot-lessons ol li {
  margin-bottom: 16px;
  line-height: 1.7;
  font-size: 16px;
}
.bot-lessons ol li:last-child { margin-bottom: 0; }
.bot-lessons strong { color: var(--text); font-weight: 600; }

.bot-privacy {
  background: rgba(255, 184, 107, 0.05);
  border: 1px solid rgba(255, 184, 107, 0.25);
  border-radius: var(--radius);
  padding: 24px 28px;
}
.bot-privacy h4 {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin: 0 0 10px;
  font-weight: 500;
}
.bot-privacy p {
  color: var(--text-dim);
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
}
.bot-privacy strong { color: var(--text); }

/* ---------- Certifications timeline ---------- */

.cert-timeline {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  position: relative;
}
.cert-timeline::before {
  content: '';
  position: absolute;
  left: 90px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--line);
}
.cert-timeline li {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 32px;
  padding: 14px 0;
  position: relative;
}
.cert-timeline li::before {
  content: '';
  position: absolute;
  left: 86px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  transition: transform var(--t), background var(--t);
}
.cert-timeline li:hover::before {
  background: var(--accent);
  transform: scale(1.2);
}
.cert-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-soft);
  padding-top: 4px;
  letter-spacing: 0.02em;
}
.cert-body h4 {
  font-family: var(--font-display);
  font-size: 18px;
  margin: 0 0 4px;
  font-weight: 500;
  color: var(--text);
}
.cert-body p {
  margin: 0;
  font-size: 14px;
  color: var(--text-dim);
}

/* ---------- Contact ---------- */

.contact-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 8px;
}
.contact-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 20px;
  align-items: center;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
  color: var(--text);
  transition: border-color var(--t), transform var(--t), background var(--t);
}
.contact-card:hover {
  border-color: var(--accent);
  background: var(--bg-3);
  transform: translateY(-3px);
  color: var(--text);
}
.contact-icon {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: 10px;
}
.contact-card h4 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  color: var(--text);
}
.contact-card p { margin: 0; color: var(--text-dim); font-size: 14px; }
.contact-arrow {
  color: var(--accent);
  font-size: 22px;
  transition: transform var(--t);
}
.contact-card:hover .contact-arrow { transform: translateX(6px); }

.contact-foot {
  margin-top: 48px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-soft);
  text-align: center;
}

/* ---------- Footer ---------- */

.footer {
  border-top: 1px solid var(--line-soft);
  margin-top: 60px;
  padding: 32px 0;
}
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-soft);
  flex-wrap: wrap;
  gap: 12px;
}
.footer a { color: var(--text-soft); }
.footer a:hover { color: var(--accent); }

/* ---------- Degree card (Education page) ---------- */
.degree-card {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 24px;
  align-items: baseline;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 26px 30px;
  margin-bottom: 8px;
  transition: border-color var(--t);
}
.degree-card:hover { border-color: var(--accent); }
.degree-meta {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.02em;
}
.degree-body h3 {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.5vw, 24px);
  font-weight: 500;
  margin: 0 0 6px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.degree-body p { margin: 0; color: var(--text-dim); font-size: 15px; }

/* ---------- Field stories ---------- */
.view-behind-the-work::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(ellipse 60% 40% at 70% 30%, rgba(34, 211, 238, 0.05), transparent 60%);
}

.story {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  margin-bottom: 22px;
  position: relative;
  transition: border-color var(--t), transform var(--t);
}
.story::before {
  content: '';
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 3px;
  background: var(--accent);
  opacity: 0.55;
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  transition: opacity var(--t);
}
.story:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}
.story:hover::before { opacity: 1; }

.story-title {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 500;
  color: var(--text);
  margin: 0 0 12px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.story-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}
.story-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.story-prose {
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.8;
  margin: 0;
}

/* Process improvements divider + internal-story variant */
.process-divider {
  margin: 60px 0 28px;
  padding-top: 50px;
  border-top: 1px solid var(--line-soft);
}
.process-divider .sub-title { margin-bottom: 10px; }
.process-divider .section-lede { margin-bottom: 0; }

.story-internal::before {
  background: var(--text-soft);
  opacity: 0.4;
}
.story-internal:hover::before { background: var(--accent); opacity: 0.9; }

/* ============================================================
   Responsive — three-tier system: 1024 / 768 / 480
   ============================================================ */

/* ---------- Tier 1: Tablet (<= 1024px) ----------
   Multi-column desktop layouts start collapsing toward single column.
*/
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    grid-template-areas:
      "photo"
      "eyebrow"
      "title"
      "detail";
    gap: 24px;
    padding: 30px 0 40px;
    min-height: 0;
  }
  .hero-photo { display: flex; justify-content: center; }
  .photo-frame { max-width: 280px; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .pillars-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .toolkit-groups { grid-template-columns: 1fr; }

  .exp { grid-template-columns: 1fr; gap: 28px; }
  .exp-tabs { flex-direction: row; overflow-x: auto; border-left: none; border-bottom: 2px solid var(--line); }
  .exp-tab { border-left: none; border-bottom: 2px solid transparent; margin-left: 0; margin-bottom: -2px; white-space: nowrap; }
  .exp-tab.is-active { border-left-color: transparent; border-bottom-color: var(--accent); }

  .bot-grid { grid-template-columns: 1fr; }
  .bot-shots-grid-3 { grid-template-columns: 1fr 1fr; }
  .contact-cards { grid-template-columns: 1fr; }

  .leadership-list li { grid-template-columns: 1fr; gap: 4px; }
  .lead-when { font-size: 12px; }

  .cert-timeline::before { left: 70px; }
  .cert-timeline li { grid-template-columns: 70px 1fr; gap: 18px; }
  .cert-timeline li::before { left: 66px; }
}

/* ---------- Tier 2: Phone (<= 768px) ----------
   Nav collapses to hamburger. Everything else goes single-column.
*/
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-cta { display: none; }
  .nav-check:checked ~ .nav-links {
    display: flex !important;
    flex-direction: column !important;
    position: fixed !important;
    top: 68px !important;
    left: 0 !important;
    right: 0 !important;
    width: 100% !important;
    max-width: 100vw !important;
    background: var(--bg-2) !important;
    border-bottom: 1px solid var(--line) !important;
    padding: 16px var(--pad-x) !important;
    gap: 4px !important;
    z-index: 2000 !important;
    box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.6);
  }
  .nav-check:checked ~ .nav-links a { padding: 12px 14px !important; font-size: 15px !important; }
  .nav-check:checked ~ .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-check:checked ~ .nav-toggle span:nth-child(2) { opacity: 0; }
  .nav-check:checked ~ .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .view { padding: 50px 0 70px; }

  .hero-title { font-size: clamp(28px, 7.5vw, 42px); }
  .hero-now { font-size: 12px; padding: 8px 14px; }
  .hero-sub { font-size: 16px; }
  .hero-detail { margin-top: 16px; }

  .stats-grid { grid-template-columns: 1fr; gap: 20px; }
  .program { padding: 24px 22px; }
  .program-scale { grid-template-columns: 1fr; gap: 12px; padding: 16px 18px; }
  .story { padding: 24px 22px; }
  .bot-shots-grid-3 { grid-template-columns: 1fr; }

  .footer-inner { flex-direction: column; }
}

/* ---------- Tier 3: Small phone (<= 480px) ----------
   Tighten padding and reduce non-essential margins for cramped screens.
*/
@media (max-width: 480px) {
  .nav { padding: 12px var(--pad-x); gap: 12px; }
  .brand-name { font-size: 14px; }

  .hero-title { font-size: clamp(26px, 8vw, 36px); }
  .hero-eyebrow { font-size: 14px; }
  .hero-sub { font-size: 15px; line-height: 1.65; }

  .section-title { font-size: clamp(28px, 8.5vw, 38px); }
  .section-lede { font-size: 15px; }

  .stat-num { font-size: clamp(32px, 9vw, 42px); }
  .stat-label { font-size: 14px; }
  .stat-label span { font-size: 12px; }

  .program { padding: 20px 18px; }
  .story { padding: 20px 18px; }
  .pillar { padding: 24px 22px; }

  .photo-frame { max-width: 240px; }
}