/* =========================
   Design Tokens
========================= */

:root {
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --radius-xs: 0.5rem;
  --radius-sm: 0.8rem;
  --radius-md: 1.25rem;
  --radius-lg: 1.8rem;
  --radius-xl: 2.4rem;

  --container: 1180px;

  --shadow-soft: 0 24px 80px rgba(0, 0, 0, 0.28);
  --shadow-card: 0 18px 50px rgba(0, 0, 0, 0.22);

  --transition-fast: 180ms ease;
  --transition-med: 280ms ease;
  --transition-slow: 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

html[data-theme="dark"] {
  --bg: #070b14;
  --bg-muted: #0c1220;
  --bg-elevated: rgba(255, 255, 255, 0.055);
  --bg-elevated-strong: rgba(255, 255, 255, 0.09);

  --text: #f4f7fb;
  --text-muted: #a7b2c7;
  --text-soft: #748198;

  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(255, 255, 255, 0.2);

  --accent: #74f2ce;
  --accent-2: #8ea7ff;
  --accent-3: #f4c86a;
  --danger: #ff7a90;

  --glass: rgba(12, 18, 32, 0.72);
  --glass-line: rgba(255, 255, 255, 0.14);
}

html[data-theme="light"] {
  --bg: #f8fafc;
  --bg-muted: #eef3f8;
  --bg-elevated: rgba(255, 255, 255, 0.78);
  --bg-elevated-strong: rgba(255, 255, 255, 0.96);

  --text: #0d1726;
  --text-muted: #4e5c70;
  --text-soft: #6d7b8e;

  --line: rgba(13, 23, 38, 0.12);
  --line-strong: rgba(13, 23, 38, 0.2);

  --accent: #087f67;
  --accent-2: #4058d6;
  --accent-3: #b87800;
  --danger: #c62846;

  --glass: rgba(255, 255, 255, 0.72);
  --glass-line: rgba(13, 23, 38, 0.12);
}

/* =========================
   Base
========================= */

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at 15% 10%, rgba(116, 242, 206, 0.13), transparent 32rem),
    radial-gradient(circle at 80% 0%, rgba(142, 167, 255, 0.18), transparent 34rem),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

img,
svg,
canvas {
  max-width: 100%;
}

::selection {
  background: rgba(116, 242, 206, 0.35);
}

.site-noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.045;
  z-index: 9999;
  background-image:
    linear-gradient(rgba(255,255,255,0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.18) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle, black, transparent 78%);
}

.cursor-glow {
  position: fixed;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(circle, rgba(116, 242, 206, 0.12), transparent 64%);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity var(--transition-med);
}

body:hover .cursor-glow {
  opacity: 1;
}

.container {
  width: min(calc(100% - 2rem), var(--container));
  margin: 0 auto;
}

.section {
  position: relative;
  padding: 7rem 0;
}

.section-full {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 8rem 0 5rem;
}

.section-muted {
  background:
    linear-gradient(180deg, transparent, rgba(255,255,255,0.03), transparent),
    var(--bg-muted);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 0.9rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 1.08;
  letter-spacing: -0.045em;
}

h1 {
  font-size: clamp(3.25rem, 8vw, 7.8rem);
  max-width: 980px;
}

h2 {
  font-size: clamp(2.1rem, 4.6vw, 4.4rem);
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.75rem);
}

p {
  margin: 0;
  color: var(--text-muted);
}

.gradient-text {
  background: linear-gradient(115deg, var(--accent), var(--accent-2), var(--accent-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 3rem;
}

.section-heading p:not(.eyebrow) {
  margin-top: 1rem;
  font-size: 1.08rem;
}

.split-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 2rem;
  margin-bottom: 3rem;
}

.split-heading > div {
  max-width: 760px;
}

/* =========================
   Header
========================= */

.site-header {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 1000;
  width: min(calc(100% - 1.5rem), 1220px);
  transform: translateX(-50%);
  margin-top: 0.75rem;
  padding: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--glass-line);
  border-radius: 999px;
  background: var(--glass);
  backdrop-filter: blur(22px);
  box-shadow: 0 16px 50px rgba(0,0,0,0.18);
  transition: transform var(--transition-med), background var(--transition-med), border-color var(--transition-med);
}

.site-header.scrolled {
  background: rgba(7, 11, 20, 0.85);
}

html[data-theme="light"] .site-header.scrolled {
  background: rgba(248, 250, 252, 0.86);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 760;
}

.brand-mark {
  width: 2.45rem;
  height: 2.45rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #06110f;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  font-size: 0.85rem;
  letter-spacing: -0.04em;
  box-shadow: 0 0 24px rgba(116, 242, 206, 0.28);
}

.brand-text {
  letter-spacing: -0.025em;
}

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

.nav-link {
  padding: 0.65rem 0.85rem;
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.92rem;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
  background: var(--bg-elevated);
}

.nav-pill {
  color: var(--text);
  border: 1px solid var(--line);
}

.theme-toggle {
  width: 2.35rem;
  height: 2.35rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  cursor: pointer;
  color: var(--text);
  background: var(--bg-elevated);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.theme-toggle:hover {
  transform: translateY(-1px);
  background: var(--bg-elevated-strong);
}

.mobile-menu-button {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--bg-elevated);
  cursor: pointer;
}

.mobile-menu-button span {
  display: block;
  width: 1.05rem;
  height: 2px;
  margin: 4px auto;
  border-radius: 2px;
  background: var(--text);
}

/* =========================
   Buttons
========================= */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.82rem 1.18rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 720;
  letter-spacing: -0.02em;
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast),
    background var(--transition-fast),
    color var(--transition-fast);
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: #06110f;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 14px 38px rgba(116, 242, 206, 0.2);
}

.button-secondary {
  color: var(--text);
  background: var(--bg-elevated);
  border-color: var(--line);
}

.button-secondary:hover {
  background: var(--bg-elevated-strong);
}

.button-ghost {
  color: var(--text-muted);
}

.button-ghost:hover {
  color: var(--text);
  background: var(--bg-elevated);
}

.button-small {
  min-height: 2.55rem;
  padding: 0.65rem 0.95rem;
  font-size: 0.92rem;
}

.text-link {
  display: inline-flex;
  color: var(--accent);
  font-weight: 720;
}

/* =========================
   Hero
========================= */

.hero {
  overflow: hidden;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.74;
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(310px, 0.85fr);
  gap: 3rem;
  align-items: center;
}

.hero-lead {
  max-width: 730px;
  margin-top: 1.45rem;
  font-size: clamp(1.08rem, 2vw, 1.35rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 2rem;
}

.hero-meta span {
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-muted);
  background: var(--bg-elevated);
  font-size: 0.88rem;
}

.hero-panel {
  justify-self: end;
  width: min(100%, 430px);
}

.glass-card {
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, var(--bg-elevated-strong), var(--bg-elevated));
  backdrop-filter: blur(22px);
  box-shadow: var(--shadow-soft);
}

.hero-research-card {
  padding: 1.45rem;
}

.card-topline {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 1.4rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.status-dot {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 18px var(--accent);
}

.hero-research-card p {
  margin-top: 1rem;
}

.mini-architecture {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  margin-top: 1.45rem;
}

.arch-node {
  min-height: 4rem;
  display: grid;
  place-items: center;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background:
    radial-gradient(circle at 20% 20%, rgba(116,242,206,0.16), transparent 40%),
    var(--bg-elevated);
  color: var(--text);
  font-weight: 720;
  font-size: 0.9rem;
  text-align: center;
}

.arch-node.wide {
  grid-column: 1 / -1;
}

.arch-node.muted {
  color: var(--text-muted);
  background: var(--bg-elevated);
}

.research-tags,
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.4rem;
}

.research-tags span,
.project-tags span {
  padding: 0.38rem 0.58rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.78rem;
}

.hero-orb {
  position: absolute;
  z-index: 1;
  border-radius: 50%;
  filter: blur(6px);
  pointer-events: none;
}

.hero-orb-one {
  width: 28rem;
  height: 28rem;
  right: -11rem;
  top: 10rem;
  background: radial-gradient(circle, rgba(142,167,255,0.18), transparent 68%);
}

.hero-orb-two {
  width: 22rem;
  height: 22rem;
  left: -10rem;
  bottom: 4rem;
  background: radial-gradient(circle, rgba(116,242,206,0.14), transparent 68%);
}

/* =========================
   Cards and Grids
========================= */

.feature-grid {
  display: grid;
  gap: 1rem;
}

.two-column {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.feature-card,
.project-card,
.article-row,
.method-strip,
.final-cta,
.latent-demo {
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.feature-card {
  min-height: 280px;
  padding: 1.35rem;
  border-radius: var(--radius-xl);
  transition: transform var(--transition-med), border-color var(--transition-med), background var(--transition-med);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--line-strong);
  background: var(--bg-elevated-strong);
}

.feature-icon {
  width: 3.2rem;
  height: 3.2rem;
  display: grid;
  place-items: center;
  margin-bottom: 1.3rem;
  border-radius: 50%;
  color: var(--accent);
  background:
    radial-gradient(circle, rgba(116,242,206,0.18), transparent 65%),
    var(--bg-elevated);
  font-size: 1.7rem;
}

.feature-card p {
  margin: 1rem 0 1.4rem;
}

.method-strip {
  display: grid;
  grid-template-columns: 0.55fr 1fr auto;
  gap: 1.3rem;
  align-items: center;
  margin-top: 1rem;
  padding: 1.25rem;
  border-radius: var(--radius-xl);
}

/* =========================
   Latent Demo
========================= */

.latent-demo {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 1.5rem;
  padding: 1.25rem;
  border-radius: var(--radius-xl);
}

.latent-visual {
  min-height: 420px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 50% 50%, rgba(116,242,206,0.12), transparent 35%),
    radial-gradient(circle at 70% 30%, rgba(142,167,255,0.12), transparent 28%),
    rgba(0,0,0,0.08);
  overflow: hidden;
}

.latent-map {
  position: relative;
  width: min(80vw, 320px);
  aspect-ratio: 1;
}

.latent-ring {
  position: absolute;
  inset: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  animation: rotateSlow 14s linear infinite;
}

.ring-two {
  inset: 15%;
  border-color: rgba(116,242,206,0.34);
  animation-duration: 18s;
  animation-direction: reverse;
}

.ring-three {
  inset: 30%;
  border-color: rgba(142,167,255,0.34);
  animation-duration: 22s;
}

.latent-ring::before {
  content: "";
  position: absolute;
  width: 0.65rem;
  height: 0.65rem;
  top: 8%;
  left: 50%;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 18px var(--accent);
}

.latent-point {
  position: absolute;
  left: 35%;
  top: 55%;
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  background: var(--accent-3);
  box-shadow: 0 0 24px var(--accent-3);
  transform: translate(-50%, -50%);
  transition: left var(--transition-slow), top var(--transition-slow);
}

.latent-controls {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.35rem;
  padding: 1rem;
}

.demo-label-row {
  display: flex;
  justify-content: space-between;
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.range-slider {
  width: 100%;
  accent-color: var(--accent);
}

.demo-output {
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
}

.demo-output p {
  margin-top: 0.8rem;
}

/* =========================
   Projects
========================= */

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.project-card {
  overflow: hidden;
  border-radius: var(--radius-xl);
  transition: transform var(--transition-med), border-color var(--transition-med);
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--line-strong);
}

.project-visual {
  min-height: 190px;
  border-bottom: 1px solid var(--line);
  background-color: var(--bg-muted);
}

.visual-latent {
  background:
    radial-gradient(circle at 30% 30%, rgba(116,242,206,0.35), transparent 12%),
    radial-gradient(circle at 65% 65%, rgba(142,167,255,0.32), transparent 16%),
    radial-gradient(circle at 50% 42%, rgba(244,200,106,0.24), transparent 10%),
    linear-gradient(135deg, rgba(116,242,206,0.05), rgba(142,167,255,0.08));
}

.visual-cyclone {
  background:
    conic-gradient(from 20deg, transparent, rgba(116,242,206,0.35), transparent, rgba(142,167,255,0.28), transparent),
    radial-gradient(circle, rgba(255,255,255,0.08), transparent 40%),
    var(--bg-muted);
}

.visual-oct {
  background:
    radial-gradient(circle, transparent 20%, rgba(116,242,206,0.34) 22%, transparent 25%),
    radial-gradient(circle, transparent 36%, rgba(142,167,255,0.26) 38%, transparent 42%),
    radial-gradient(circle, transparent 52%, rgba(244,200,106,0.18) 54%, transparent 59%),
    var(--bg-muted);
}

.project-body {
  padding: 1.25rem;
}

.project-kicker {
  margin-bottom: 0.6rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
}

.project-body p:not(.project-kicker) {
  margin-top: 0.85rem;
}

.project-body .text-link {
  margin-top: 1.25rem;
}

/* =========================
   Timeline
========================= */

.timeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 1.12rem;
  left: 5%;
  right: 5%;
  height: 1px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
  opacity: 0.45;
}

.timeline-item {
  position: relative;
  padding: 3rem 1.2rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
}

.timeline-dot {
  position: absolute;
  top: 0.75rem;
  left: 1.2rem;
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 18px var(--accent);
}

.timeline-item p {
  margin-top: 0.65rem;
}

/* =========================
   Articles
========================= */

.article-list {
  display: grid;
  gap: 0.8rem;
}

.article-row {
  display: grid;
  grid-template-columns: 150px 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1.1rem 1.2rem;
  border-radius: var(--radius-lg);
  transition: transform var(--transition-med), background var(--transition-med);
}

.article-row:hover {
  transform: translateX(4px);
  background: var(--bg-elevated-strong);
}

.article-row h3 {
  font-size: 1.12rem;
  letter-spacing: -0.025em;
}

.article-date,
.article-row span:last-child {
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* =========================
   Final CTA
========================= */

.final-cta-section {
  padding-top: 3rem;
}

.final-cta {
  padding: clamp(2rem, 5vw, 4rem);
  border-radius: var(--radius-xl);
  text-align: center;
  background:
    radial-gradient(circle at 50% 0%, rgba(116,242,206,0.14), transparent 36%),
    var(--bg-elevated);
}

.final-cta h2,
.final-cta p {
  max-width: 790px;
  margin-left: auto;
  margin-right: auto;
}

.final-cta p {
  margin-top: 1rem;
}

.final-cta .button {
  margin-top: 2rem;
}

/* =========================
   Footer
========================= */

.site-footer {
  padding: 3rem 0 1.5rem;
  border-top: 1px solid var(--line);
  background: var(--bg-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 2rem;
  align-items: start;
}

.footer-brand {
  margin-bottom: 1rem;
}

.footer-links {
  display: grid;
  gap: 0.55rem;
}

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

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

.footer-bottom {
  margin-top: 2.2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}

/* =========================
   Reveal Animation
========================= */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms ease, transform 700ms ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 {
  transition-delay: 110ms;
}

.delay-2 {
  transition-delay: 220ms;
}

/* =========================
   Animations
========================= */

@keyframes rotateSlow {
  to {
    transform: rotate(360deg);
  }
}

/* =========================
   Responsive
========================= */

@media (max-width: 980px) {
  .site-header {
    border-radius: var(--radius-lg);
  }

  .mobile-menu-button {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: calc(100% + 0.5rem);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--glass);
    backdrop-filter: blur(22px);
  }

  .site-nav.open {
    display: flex;
  }

  .nav-link {
    padding: 0.9rem 1rem;
  }

  .theme-toggle {
    align-self: flex-start;
  }

  .hero-grid,
  .latent-demo,
  .method-strip,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    justify-self: start;
    width: 100%;
  }

  .project-grid,
  .timeline {
    grid-template-columns: 1fr 1fr;
  }

  .timeline::before {
    display: none;
  }

  .article-row {
    grid-template-columns: 1fr;
  }

  .split-heading {
    align-items: start;
    flex-direction: column;
  }
}

@media (max-width: 680px) {
  .container {
    width: min(calc(100% - 1.25rem), var(--container));
  }

  .section {
    padding: 4.5rem 0;
  }

  .section-full {
    padding-top: 7rem;
  }

  .brand-text {
    display: none;
  }

  .hero-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .two-column,
  .project-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .latent-visual {
    min-height: 320px;
  }

  .footer-grid {
    gap: 1.5rem;
  }
}

/* =========================
   Batch 2: Shared Inner Pages
========================= */

.page-hero {
  overflow: hidden;
  background:
    radial-gradient(circle at 18% 18%, rgba(116, 242, 206, 0.12), transparent 32rem),
    radial-gradient(circle at 82% 12%, rgba(142, 167, 255, 0.16), transparent 34rem);
}

.page-hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -35% -10%;
  height: 55%;
  background:
    radial-gradient(ellipse at center, rgba(116, 242, 206, 0.08), transparent 64%);
  pointer-events: none;
}

.page-hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 3rem;
  align-items: center;
}

.page-hero-content {
  max-width: 860px;
}

.profile-card,
.research-question-card,
.method-mini-panel,
.domain-visual-card {
  padding: 1.5rem;
  border-radius: var(--radius-xl);
}

.profile-avatar {
  width: 7rem;
  height: 7rem;
  display: grid;
  place-items: center;
  margin-bottom: 1.3rem;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, rgba(255, 255, 255, 0.4), transparent 20%),
    linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06110f;
  font-size: 2rem;
  font-weight: 850;
  box-shadow: 0 0 45px rgba(116, 242, 206, 0.24);
}

.profile-card p,
.research-question-card p,
.method-mini-panel p {
  margin-top: 1rem;
}

.profile-list {
  display: grid;
  gap: 0.8rem;
  margin-top: 1.4rem;
}

.profile-list div {
  padding: 0.95rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
}

.profile-list span {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.profile-list strong {
  display: block;
  color: var(--text);
  font-size: 0.96rem;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) minmax(0, 1.2fr);
  gap: 3rem;
  align-items: start;
}

.prose-card {
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.prose-card p + p {
  margin-top: 1.15rem;
}

.three-column {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.research-philosophy {
  padding: clamp(1.4rem, 4vw, 2.4rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.philosophy-grid > div {
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
}

.philosophy-grid p {
  margin-top: 0.75rem;
}

.research-question-card h2,
.method-mini-panel h2 {
  font-size: clamp(1.55rem, 2.6vw, 2.5rem);
}

/* =========================
   Research Map
========================= */

.research-map {
  display: grid;
  gap: 1.2rem;
}

.research-map-node {
  position: relative;
  display: grid;
  gap: 0.35rem;
  padding: 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-med), background var(--transition-med), border-color var(--transition-med);
}

.research-map-node:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  background: var(--bg-elevated-strong);
}

.research-map-node.core {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
  background:
    radial-gradient(circle at 50% 0%, rgba(116, 242, 206, 0.16), transparent 42%),
    var(--bg-elevated);
}

.research-map-node span,
.research-map-node small {
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.research-map-node strong {
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  letter-spacing: -0.04em;
}

.research-map-branches {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2.5rem;
}

.research-map-branches::before {
  content: "";
  position: absolute;
  left: 20%;
  right: 20%;
  top: -1.25rem;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), var(--accent-2), transparent);
}

/* =========================
   Process / Metrics / Specs
========================= */

.process-grid,
.metric-grid,
.data-spec-grid,
.loss-grid,
.question-grid {
  display: grid;
  gap: 1rem;
}

.process-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.metric-grid,
.data-spec-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.loss-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.question-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.process-step,
.metric-card,
.spec-card,
.loss-card,
.question-card,
.note-card {
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.process-step span,
.loss-card span,
.spec-card span {
  display: inline-flex;
  margin-bottom: 1rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.process-step p,
.metric-card p,
.spec-card p,
.loss-card p,
.question-card p {
  margin-top: 0.75rem;
}

.metric-number {
  display: block;
  margin-bottom: 1.1rem;
  color: var(--accent);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 850;
  line-height: 1;
  letter-spacing: -0.06em;
}

.note-card {
  margin-top: 1rem;
  color: var(--text-muted);
}

.note-card strong {
  color: var(--text);
}

/* =========================
   Architecture
========================= */

.architecture-card {
  display: grid;
  grid-template-columns: 0.8fr 1.1fr 1fr 1fr 1fr;
  gap: 1rem;
  align-items: center;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 50% 0%, rgba(142, 167, 255, 0.1), transparent 36%),
    var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.architecture-column {
  display: grid;
  gap: 0.8rem;
}

.architecture-node {
  min-height: 5.5rem;
  display: grid;
  place-items: center;
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  color: var(--text);
  font-weight: 800;
  text-align: center;
}

.architecture-node span {
  margin-top: 0.25rem;
  color: var(--text-soft);
  font-size: 0.82rem;
  font-weight: 600;
}

.input-node {
  border-color: rgba(116, 242, 206, 0.3);
}

.latent-node {
  background:
    radial-gradient(circle, rgba(116, 242, 206, 0.18), transparent 70%),
    var(--bg-elevated);
}

.decoder-node {
  border-color: rgba(142, 167, 255, 0.32);
}

.output-node {
  border-color: rgba(244, 200, 106, 0.32);
}

.center-actions {
  justify-content: center;
}

/* =========================
   Domain Visuals
========================= */

.domain-visual-card {
  display: grid;
  place-items: center;
  min-height: 420px;
  text-align: center;
}

.domain-visual-card p {
  margin-top: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.retina-placeholder {
  position: relative;
  width: min(100%, 300px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(116,242,206,0.08), transparent 45%),
    var(--bg-elevated);
}

.retina-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(116, 242, 206, 0.35);
  animation: rotateSlow 18s linear infinite;
}

.retina-ring.r1 {
  inset: 12%;
}

.retina-ring.r2 {
  inset: 25%;
  border-color: rgba(142, 167, 255, 0.38);
  animation-direction: reverse;
}

.retina-ring.r3 {
  inset: 38%;
  border-color: rgba(244, 200, 106, 0.34);
}

.retina-disc {
  width: 28%;
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle at 40% 35%, rgba(255,255,255,0.45), transparent 24%),
    linear-gradient(135deg, rgba(116,242,206,0.8), rgba(142,167,255,0.78));
  box-shadow: 0 0 34px rgba(116,242,206,0.2);
}

.cyclone-placeholder {
  position: relative;
  width: min(100%, 320px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background:
    conic-gradient(from 30deg, transparent, rgba(116,242,206,0.3), transparent, rgba(142,167,255,0.26), transparent),
    radial-gradient(circle, rgba(255,255,255,0.08), transparent 60%);
  animation: rotateSlow 22s linear infinite;
}

.cyclone-core {
  width: 18%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 36px var(--accent);
}

.cyclone-arm {
  position: absolute;
  inset: 13%;
  border-radius: 50%;
  border-top: 3px solid rgba(116,242,206,0.65);
  border-right: 1px solid transparent;
  border-bottom: 3px solid rgba(142,167,255,0.52);
  border-left: 1px solid transparent;
}

/* =========================
   Pipeline
========================= */

.pipeline {
  display: grid;
  grid-template-columns: repeat(9, auto);
  gap: 0.65rem;
  align-items: center;
  justify-content: center;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
  overflow-x: auto;
}

.pipeline-step {
  min-width: 132px;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  color: var(--text);
  font-weight: 780;
  text-align: center;
}

.pipeline-arrow {
  color: var(--accent);
  font-weight: 850;
}

/* =========================
   Tensor Demo
========================= */

.tensor-demo {
  display: grid;
  grid-template-columns: repeat(5, minmax(120px, 1fr));
  gap: 1rem;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
  overflow-x: auto;
}

.tensor-frame {
  min-width: 120px;
  padding: 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
}

.tensor-frame span {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.tensor-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.3rem;
}

.tensor-grid i {
  aspect-ratio: 1;
  border-radius: 0.35rem;
  background: linear-gradient(
    135deg,
    rgba(116,242,206,0.18),
    rgba(142,167,255,0.28)
  );
}

.tensor-frame:nth-child(2) .tensor-grid i:nth-child(3n),
.tensor-frame:nth-child(4) .tensor-grid i:nth-child(2n) {
  background: linear-gradient(
    135deg,
    rgba(244,200,106,0.3),
    rgba(116,242,206,0.2)
  );
}

.tensor-frame:nth-child(5) .tensor-grid i:nth-child(odd) {
  background: linear-gradient(
    135deg,
    rgba(142,167,255,0.34),
    rgba(244,200,106,0.22)
  );
}

/* =========================
   Batch 2 Responsive
========================= */

@media (max-width: 980px) {
  .page-hero-grid,
  .content-grid,
  .architecture-card {
    grid-template-columns: 1fr;
  }

  .three-column,
  .philosophy-grid,
  .process-grid,
  .metric-grid,
  .data-spec-grid,
  .loss-grid,
  .question-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .research-map-branches {
    grid-template-columns: 1fr;
  }

  .pipeline {
    justify-content: start;
  }

  .tensor-demo {
    grid-template-columns: repeat(5, 150px);
  }
}

@media (max-width: 680px) {
  .three-column,
  .philosophy-grid,
  .process-grid,
  .metric-grid,
  .data-spec-grid,
  .loss-grid,
  .question-grid {
    grid-template-columns: 1fr;
  }

  .domain-visual-card {
    min-height: 320px;
  }

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

  .pipeline-arrow {
    transform: rotate(90deg);
    justify-self: center;
  }

  .pipeline-step {
    width: 100%;
  }
}

/* =========================
   Batch 3: Projects
========================= */

.project-index-card {
  padding: 1.5rem;
  border-radius: var(--radius-xl);
}

.project-theme-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.25rem;
}

.project-theme-list span {
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  background: var(--bg-elevated);
  font-size: 0.9rem;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 2rem;
}

.filter-button {
  padding: 0.72rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-muted);
  background: var(--bg-elevated);
  cursor: pointer;
  transition:
    transform var(--transition-fast),
    color var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast);
}

.filter-button:hover,
.filter-button.active {
  transform: translateY(-1px);
  color: var(--text);
  border-color: var(--line-strong);
  background: var(--bg-elevated-strong);
}

.project-card.hidden {
  display: none;
}

.project-grid-large {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.visual-agents {
  background:
    radial-gradient(circle at 25% 35%, rgba(116,242,206,0.26), transparent 13%),
    radial-gradient(circle at 70% 30%, rgba(142,167,255,0.26), transparent 14%),
    radial-gradient(circle at 52% 70%, rgba(244,200,106,0.2), transparent 12%),
    linear-gradient(135deg, rgba(116,242,206,0.05), rgba(142,167,255,0.06));
  position: relative;
}

.visual-agents::before,
.visual-agents::after {
  content: "";
  position: absolute;
  inset: 24%;
  border: 1px solid rgba(116,242,206,0.25);
  border-radius: 50%;
}

.visual-agents::after {
  inset: 36%;
  border-color: rgba(142,167,255,0.3);
}

.visual-code {
  background:
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    radial-gradient(circle at 20% 20%, rgba(116,242,206,0.22), transparent 18%),
    var(--bg-muted);
  background-size: 28px 28px, 28px 28px, auto, auto;
}

.visual-notebook {
  background:
    linear-gradient(135deg, rgba(116,242,206,0.1), rgba(142,167,255,0.1)),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 18px,
      rgba(255,255,255,0.055) 19px
    ),
    var(--bg-muted);
}

.visual-oct-alt {
  background:
    radial-gradient(circle at 48% 52%, transparent 14%, rgba(142,167,255,0.35) 16%, transparent 19%),
    radial-gradient(circle at 50% 50%, transparent 34%, rgba(116,242,206,0.28) 36%, transparent 40%),
    radial-gradient(circle at 50% 50%, transparent 52%, rgba(244,200,106,0.22) 54%, transparent 60%),
    var(--bg-muted);
}

/* =========================
   Project Detail Pages
========================= */

.project-detail-summary {
  padding: 1.5rem;
  border-radius: var(--radius-xl);
}

.project-detail-summary h2 {
  font-size: clamp(1.55rem, 2.4vw, 2.4rem);
}

.project-facts {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.project-facts div {
  padding: 0.95rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
}

.project-facts span {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.project-facts strong {
  display: block;
  color: var(--text);
}

.project-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.detail-card {
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.detail-card span {
  display: inline-flex;
  margin-bottom: 1rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.detail-card p {
  margin-top: 0.75rem;
}

.output-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.output-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.output-visual {
  min-height: 210px;
  border-bottom: 1px solid var(--line);
}

.output-card h3,
.output-card p {
  padding-left: 1.15rem;
  padding-right: 1.15rem;
}

.output-card h3 {
  margin-top: 1.15rem;
}

.output-card p {
  margin-top: 0.65rem;
  padding-bottom: 1.2rem;
}

.reflection-list {
  display: grid;
  gap: 1rem;
}

.reflection-list > div {
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.reflection-list p {
  margin-top: 0.65rem;
}

/* =========================
   Batch 3 Responsive
========================= */

@media (max-width: 980px) {
  .project-grid-large,
  .project-detail-grid,
  .output-gallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .project-grid-large,
  .project-detail-grid,
  .output-gallery {
    grid-template-columns: 1fr;
  }

  .filter-bar {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .filter-button {
    width: 100%;
  }
}

/* =========================
   Batch 4: Teaching, Writing, CV, Contact
========================= */

.teaching-card,
.writing-card,
.cv-summary-card,
.contact-info-card {
  padding: 1.5rem;
  border-radius: var(--radius-xl);
}

.teaching-card h2,
.writing-card h2,
.cv-summary-card h2,
.contact-info-card h2 {
  font-size: clamp(1.55rem, 2.4vw, 2.4rem);
}

.teaching-card p,
.writing-card p,
.cv-summary-card p {
  margin-top: 1rem;
}

.teaching-grid,
.writing-category-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.teaching-topic,
.feedback-card,
.writing-category {
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.teaching-topic p,
.feedback-card p,
.writing-category p {
  margin-top: 0.75rem;
}

.feedback-layout {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.feedback-card span {
  display: inline-flex;
  margin-bottom: 1rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.teaching-note {
  margin-top: 1rem;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.teaching-note strong {
  color: var(--text);
}

/* =========================
   Writing
========================= */

.featured-writing {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 1.25rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.featured-writing-visual {
  min-height: 360px;
  border-right: 1px solid var(--line);
}

.featured-writing-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.5rem;
}

.featured-writing-body h3 {
  font-size: clamp(1.65rem, 3vw, 2.65rem);
}

.featured-writing-body p {
  margin-top: 1rem;
}

.featured-writing-body .button {
  align-self: flex-start;
  margin-top: 1.5rem;
}

.writing-category h3 {
  font-size: 1.25rem;
}

/* =========================
   CV
========================= */

.cv-summary-card {
  min-height: 360px;
}

.cv-mini-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.3rem;
}

.cv-mini-list span {
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  background: var(--bg-elevated);
  font-size: 0.86rem;
}

.cv-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.cv-sidebar {
  position: sticky;
  top: 7rem;
}

.cv-sidebar-card {
  display: grid;
  gap: 0.5rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.cv-sidebar-card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.cv-sidebar-card a {
  padding: 0.55rem 0.65rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.cv-sidebar-card a:hover {
  color: var(--text);
  background: var(--bg-elevated-strong);
}

.cv-main {
  display: grid;
  gap: 1.2rem;
}

.cv-section {
  padding: 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
  scroll-margin-top: 8rem;
}

.cv-section h2 {
  margin-bottom: 1.2rem;
  font-size: clamp(1.65rem, 3vw, 2.5rem);
}

.cv-item {
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
}

.cv-item + .cv-item {
  margin-top: 0.9rem;
}

.cv-item-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
  margin-bottom: 0.6rem;
}

.cv-item-header h3 {
  font-size: 1.15rem;
}

.cv-item-header span {
  flex: 0 0 auto;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.cv-item ul {
  margin: 0.8rem 0 0;
  padding-left: 1.2rem;
  color: var(--text-muted);
}

.cv-item li + li {
  margin-top: 0.35rem;
}

.placeholder-item {
  border-style: dashed;
}

.skill-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-cloud span {
  padding: 0.58rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text);
}

/* =========================
   Contact
========================= */

.contact-link-list {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.contact-link-list a {
  display: grid;
  gap: 0.25rem;
  padding: 0.95rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.contact-link-list a:hover {
  transform: translateY(-2px);
  background: var(--bg-elevated-strong);
}

.contact-link-list span {
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.contact-link-list strong {
  color: var(--text);
  overflow-wrap: anywhere;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.75fr) minmax(0, 1.25fr);
  gap: 3rem;
  align-items: start;
}

.contact-form {
  padding: 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}

.form-row {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.form-row label {
  color: var(--text);
  font-weight: 720;
}

.form-row input,
.form-row select,
.form-row textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 0.9rem 1rem;
  color: var(--text);
  background: var(--bg);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-row textarea {
  resize: vertical;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  border-color: rgba(116, 242, 206, 0.55);
  box-shadow: 0 0 0 4px rgba(116, 242, 206, 0.12);
}

.form-status {
  margin-top: 1rem;
  min-height: 1.4rem;
  color: var(--accent);
}

/* =========================
   Batch 4 Responsive
========================= */

@media (max-width: 980px) {
  .teaching-grid,
  .feedback-layout,
  .writing-category-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .featured-writing,
  .cv-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .featured-writing-visual {
    min-height: 260px;
    border-right: none;
    border-bottom: 1px solid var(--line);
  }

  .cv-sidebar {
    position: static;
  }

  .cv-sidebar-card {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .cv-sidebar-card h3 {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  .teaching-grid,
  .feedback-layout,
  .writing-category-grid {
    grid-template-columns: 1fr;
  }

  .cv-sidebar-card {
    grid-template-columns: 1fr;
  }

  .cv-item-header {
    flex-direction: column;
  }
}