/* ============================================================
   DESIGN TOKENS
   ============================================================ */

:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fonts */
  --font-display: 'Cabinet Grotesk', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ============================================================
   LIGHT MODE (default)
   ============================================================ */

:root, [data-theme="light"] {
  --color-bg:             #fafafa;
  --color-surface:        #ffffff;
  --color-surface-2:      #f5f5f5;
  --color-surface-offset: #f0f0f0;
  --color-divider:        #e5e5e5;
  --color-border:         #d4d4d4;

  --color-text:           #171717;
  --color-text-muted:     #737373;
  --color-text-faint:     #a3a3a3;
  --color-text-inverse:   #fafafa;

  --color-primary:        #0f766e;
  --color-primary-hover:  #0d5f59;
  --color-primary-active: #0a4a45;
  --color-primary-highlight: #ccfbf1;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08);
}

/* ============================================================
   DARK MODE
   ============================================================ */

[data-theme="dark"] {
  --color-bg:             #0a0a0a;
  --color-surface:        #141414;
  --color-surface-2:      #1c1c1c;
  --color-surface-offset: #1a1a1a;
  --color-divider:        #262626;
  --color-border:         #333333;

  --color-text:           #e5e5e5;
  --color-text-muted:     #a3a3a3;
  --color-text-faint:     #666666;
  --color-text-inverse:   #171717;

  --color-primary:        #2dd4bf;
  --color-primary-hover:  #5eead4;
  --color-primary-active: #99f6e4;
  --color-primary-highlight: #1a2e2b;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #0a0a0a;
    --color-surface:        #141414;
    --color-surface-2:      #1c1c1c;
    --color-surface-offset: #1a1a1a;
    --color-divider:        #262626;
    --color-border:         #333333;
    --color-text:           #e5e5e5;
    --color-text-muted:     #a3a3a3;
    --color-text-faint:     #666666;
    --color-text-inverse:   #171717;
    --color-primary:        #2dd4bf;
    --color-primary-hover:  #5eead4;
    --color-primary-active: #99f6e4;
    --color-primary-highlight: #1a2e2b;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  }
}

/* ============================================================
   LAYOUT
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.container--narrow {
  max-width: var(--content-default);
}

section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

/* ============================================================
   HEADER / NAV
   ============================================================ */

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.header--scrolled {
  border-bottom-color: var(--color-divider);
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.header__logo-mark {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.header__logo-text {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

.nav__link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  position: relative;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text);
}

.nav__link--active::after {
  width: 100%;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-primary);
  transition: width 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav__link:hover::after {
  width: 100%;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

/* Mobile nav */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: var(--space-1);
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    inset: 0;
    background: var(--color-bg);
    flex-direction: column;
    justify-content: center;
    gap: var(--space-8);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 100;
  }
  .nav.is-open {
    opacity: 1;
    pointer-events: all;
  }
  .nav__link {
    font-size: var(--text-xl);
    font-family: var(--font-display);
    font-weight: 600;
  }
  .nav-close {
    position: absolute;
    top: var(--space-6);
    right: var(--space-6);
    font-size: var(--text-xl);
    color: var(--color-text);
    z-index: 101;
  }
}

@media (min-width: 769px) {
  .nav-close { display: none; }
}

/* ============================================================
   HERO
   ============================================================ */

.hero {
  min-height: 70vh;
  display: flex;
  align-items: center;
  padding-block: clamp(var(--space-16), 12vw, var(--space-32));
  position: relative;
  overflow: hidden;
}

/* Full-hero particle canvas */
.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
  position: relative;
  z-index: 1;
}

@media (min-width: 769px) {
  .hero__inner {
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--space-12);
  }
}

.hero__tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
}

.hero__tag::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero__heading {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.hero__heading span {
  color: var(--color-primary);
}

.hero__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 900px;
}

.hero__graphic {
  width: 100%;
  max-width: 380px;
  aspect-ratio: 1;
  position: relative;
  animation: hero-float-3d 10s ease-in-out infinite;
  transform-style: preserve-3d;
  will-change: transform;
}

@keyframes hero-float-3d {
  0%   { transform: rotateY(-6deg) rotateX(4deg)  translateY(0px); }
  25%  { transform: rotateY(3deg)  rotateX(-2deg) translateY(-12px); }
  50%  { transform: rotateY(6deg)  rotateX(3deg)  translateY(-6px); }
  75%  { transform: rotateY(-2deg) rotateX(-4deg) translateY(-14px); }
  100% { transform: rotateY(-6deg) rotateX(4deg)  translateY(0px); }
}

@media (prefers-reduced-motion: reduce) {
  .hero__graphic { animation: none; }
}

/* Animated abstract graphic */
.hero__graphic svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 8px 24px rgba(15,118,110,0.18));
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  text-decoration: none;
  white-space: nowrap;
  transition: all var(--transition-interactive);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-text-muted);
  background: var(--color-surface-2);
}

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}

.btn--ghost:hover {
  background: var(--color-primary-highlight);
  transform: translateY(-1px);
}

.btn__icon {
  width: 16px;
  height: 16px;
}

/* ============================================================
   SECTION HEADINGS
   ============================================================ */

.section-header {
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-12));
}

.section-label {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-3);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.section-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-top: var(--space-3);
  max-width: 60ch;
}

/* ============================================================
   ABOUT
   ============================================================ */

.about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 769px) {
  .about__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
  }
}

.about__text p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.about__text p:last-child {
  margin-bottom: 0;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

.skill-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
}

.skill-item__dot {
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

/* ============================================================
   PROJECTS / WORK
   ============================================================ */

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 769px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: border-color 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
  will-change: transform;
}

.project-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 20px 60px -10px rgba(15,118,110,0.2), 0 8px 24px -4px rgba(0,0,0,0.1);
}

.project-card__icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-highlight);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
  color: var(--color-primary);
}

.project-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.project-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
  line-height: 1.6;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-divider);
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  margin-top: var(--space-4);
}

.project-card__link:hover {
  text-decoration: underline;
}

.project-card__link svg {
  width: 14px;
  height: 14px;
}

/* ============================================================
   ARTICLES
   ============================================================ */

.articles-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.article-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: border-color 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transform-style: preserve-3d;
  will-change: transform;
}

.article-item:hover {
  border-color: var(--color-primary);
  box-shadow: 0 16px 40px -8px rgba(15,118,110,0.15), 0 4px 12px -2px rgba(0,0,0,0.08);
}

.article-item__content {
  flex: 1;
}

.article-item__date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 500;
  margin-bottom: var(--space-2);
  font-variant-numeric: tabular-nums;
}

.article-item__title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.article-item__excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.article-item__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.article-item__arrow {
  color: var(--color-text-faint);
  flex-shrink: 0;
  margin-top: var(--space-2);
  transition: transform 0.2s ease, color 0.2s ease;
}

.article-item:hover .article-item__arrow {
  color: var(--color-primary);
  transform: translateX(4px);
}

.articles-loading {
  color: var(--color-text-faint);
  font-size: var(--text-sm);
  padding: var(--space-6) 0;
}

.article-item__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.article-item__source {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.article-item__source--devto {
  background: #3b49df22;
  color: #3b49df;
}

[data-theme="dark"] .article-item__source--devto {
  background: #3b49df33;
  color: #818cf8;
}

.article-item__source--linkedin {
  background: #0a66c222;
  color: #0a66c2;
}

[data-theme="dark"] .article-item__source--linkedin {
  background: #0a66c233;
  color: #60a5fa;
}

/* ============================================================
   ARTICLES PAGE
   ============================================================ */

.page-hero {
  padding-block: clamp(var(--space-12), 8vw, var(--space-20));
  border-bottom: 1px solid var(--color-divider);
}

.page-hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-top: var(--space-3);
  margin-bottom: var(--space-4);
}

.page-hero__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 56ch;
  line-height: 1.7;
}

.articles-page {
  padding-block: var(--space-12);
}

.tabs {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-divider);
  padding-bottom: 0;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: var(--space-3) var(--space-4);
  margin-bottom: -1px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.tab-btn:hover {
  color: var(--color-text);
}

.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* ============================================================
   CONNECT / PROFILES
   ============================================================ */

.connect-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

.connect-link {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: border-color 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              background 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  transform-style: preserve-3d;
  will-change: transform;
}

.connect-link:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
  box-shadow: 0 16px 40px -8px rgba(15,118,110,0.18), 0 4px 12px -2px rgba(0,0,0,0.08);
}

.connect-link__icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

.connect-link:hover .connect-link__icon {
  color: var(--color-primary);
}

.connect-link__name {
  font-weight: 600;
  font-size: var(--text-sm);
}

.connect-link__handle {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ============================================================
   CONTACT
   ============================================================ */

.contact__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 769px) {
  .contact__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
  }
}

.contact__text p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.contact__email-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
}

.contact__email-link:hover {
  text-decoration: underline;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-group label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  transition: border-color var(--transition-interactive);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ============================================================
   FOOTER
   ============================================================ */

.footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-8);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}

.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__links {
  display: flex;
  gap: var(--space-6);
}

.footer__link {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}

.footer__link:hover {
  color: var(--color-text-muted);
}

/* ============================================================
   RESEARCH PAGE
   ============================================================ */

.research-page {
  padding-block: var(--space-12);
}

/* Profile link cards (Scholar / ResearchGate) */
.research-profiles {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}

.research-profile-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive);
}

.research-profile-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0,0,0,.08);
  transform: translateY(-2px);
  color: var(--color-primary);
}

.research-profile-card__icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
}

.research-profile-card__icon--scholar {
  background: #4285F4;
  color: #fff;
}

.research-profile-card__icon--rg {
  background: #00CCBB;
  color: #fff;
}

.research-profile-card__meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.research-profile-card__label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 400;
}

/* Research area chips */
.research-areas {
  margin-bottom: var(--space-12);
}

.research-areas__title {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}

.research-areas__chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.research-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: color-mix(in srgb, var(--color-primary) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-primary) 20%, transparent);
  color: var(--color-primary);
  border-radius: 100px;
  font-size: var(--text-sm);
  font-weight: 500;
}

/* Publication cards */
.publications-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.publication-card {
  display: flex;
  gap: var(--space-6);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
  transform-style: preserve-3d;
  will-change: transform;
}

.publication-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 16px 48px -10px rgba(15,118,110,0.18), 0 4px 12px -2px rgba(0,0,0,0.08);
}

.publication-card__year {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--color-primary) 10%, transparent);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
}

.publication-card__body {
  flex: 1;
  min-width: 0;
}

.publication-card__journal {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-2);
}

.publication-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  line-height: 1.35;
}

.publication-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

.publication-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.publication-card__arrow {
  flex-shrink: 0;
  align-self: center;
  color: var(--color-text-faint);
  transition: color var(--transition-interactive), transform var(--transition-interactive);
}

.publication-card:hover .publication-card__arrow {
  color: var(--color-primary);
  transform: translateX(4px);
}

@media (max-width: 600px) {
  .publication-card {
    flex-direction: column;
    gap: var(--space-3);
  }
  .publication-card__year {
    width: 44px;
    height: 44px;
    font-size: var(--text-xs);
  }
  .publication-card__arrow {
    display: none;
  }
}

/* ============================================================
   EXPERIENCE TIMELINE
   ============================================================ */

.experience-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.exp-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-7, 1.75rem);
  transition: border-color 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transform-style: preserve-3d;
  will-change: transform;
}

.exp-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 16px 48px -10px rgba(15,118,110,0.14), 0 4px 12px -2px rgba(0,0,0,0.07);
}

.exp-card__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.exp-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
}

.exp-card__company {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.exp-card__meta {
  display: flex;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.exp-card__meta span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.exp-card__bullets {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.exp-card__bullets li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  padding-left: var(--space-5);
  position: relative;
}

.exp-card__bullets li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-size: 0.7rem;
  top: 4px;
  font-weight: 700;
}

.exp-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.exp-card--current {
  border-left-color: var(--color-primary);
  background: linear-gradient(135deg, var(--color-surface) 85%, var(--color-primary-highlight) 100%);
}

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; opacity: 1; transform: translateY(0); }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 80ms; opacity: 1; transform: translateY(0); }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 160ms; opacity: 1; transform: translateY(0); }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 240ms; opacity: 1; transform: translateY(0); }
.reveal-stagger.is-visible > *:nth-child(5) { transition-delay: 320ms; opacity: 1; transform: translateY(0); }
.reveal-stagger.is-visible > *:nth-child(6) { transition-delay: 400ms; opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal-stagger > * {
    opacity: 1;
    transform: none;
    transition: none;
  }
}