/* =========================================================================
   Qazi Nasir — Academic Researcher Portfolio
   Design system: warm paper neutrals + deep teal ink, Fraunces serif display
   paired with Satoshi grotesque body. Academic, precise, editorial.
   ========================================================================= */

/* ---- Design Tokens ---- */
:root,
[data-theme='light'] {
  /* Surfaces — warm paper */
  --color-bg: #f5f3ee;
  --color-surface: #fbfaf7;
  --color-surface-2: #fffdf9;
  --color-surface-offset: #eeece6;
  --color-surface-offset-2: #e6e3db;
  --color-divider: #e0ddd5;
  --color-border: #d3cfc4;

  /* Text — ink */
  --color-text: #1a1a18;
  --color-text-muted: #5f5e58;
  --color-text-faint: #9a9890;
  --color-text-inverse: #f9f7f2;

  /* Primary — deep teal (hydrate / fluid / lab precision) */
  --color-primary: #0d5454;
  --color-primary-hover: #0a4040;
  --color-primary-active: #073131;
  --color-primary-soft: #d6e4e1;
  --color-primary-tint: rgba(13, 84, 84, 0.08);

  /* Secondary accent — oxidized copper (used sparingly) */
  --color-accent: #b8651f;
  --color-accent-soft: #f0e3d6;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows — tone-matched to warm surfaces */
  --shadow-sm: 0 1px 2px rgba(40, 38, 30, 0.06);
  --shadow-md: 0 6px 24px -8px rgba(40, 38, 30, 0.12);
  --shadow-lg: 0 24px 60px -20px rgba(40, 38, 30, 0.22);

  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.83rem + 0.22vw, 0.9375rem);
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --text-lg: clamp(1.15rem, 1rem + 0.7vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.25rem + 1.1vw, 2.25rem);
  --text-2xl: clamp(2.1rem, 1.4rem + 2.6vw, 3.6rem);
  --text-3xl: clamp(2.6rem, 1rem + 6vw, 5.2rem);
  --text-hero: clamp(3rem, 0.8rem + 8vw, 7rem);

  /* Spacing — 4px system */
  --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;

  --transition: 220ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 600ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 680px;
  --content-default: 1100px;
  --content-wide: 1280px;

  --font-display: 'Stack Sans Notch', system-ui, sans-serif;
  --font-body: 'Stack Sans Notch', system-ui, sans-serif;
  --font-mono: 'Geist Pixel', ui-monospace, monospace;
}

[data-theme='dark'] {
  --color-bg: #101312;
  --color-surface: #161a19;
  --color-surface-2: #1b201e;
  --color-surface-offset: #181c1b;
  --color-surface-offset-2: #20251f;
  --color-divider: #222726;
  --color-border: #2c3231;

  --color-text: #d7d5cf;
  --color-text-muted: #8d8b84;
  --color-text-faint: #5c5b56;
  --color-text-inverse: #15181a;

  --color-primary: #5fb0a6;
  --color-primary-hover: #7cc1b8;
  --color-primary-active: #94d0c8;
  --color-primary-soft: #1d2e2c;
  --color-primary-tint: rgba(95, 176, 166, 0.1);

  --color-accent: #d18a4e;
  --color-accent-soft: #2c2419;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 6px 24px -8px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 24px 60px -20px rgba(0, 0, 0, 0.65);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #101312;
    --color-surface: #161a19;
    --color-surface-2: #1b201e;
    --color-surface-offset: #181c1b;
    --color-surface-offset-2: #20251f;
    --color-divider: #222726;
    --color-border: #2c3231;
    --color-text: #d7d5cf;
    --color-text-muted: #8d8b84;
    --color-text-faint: #5c5b56;
    --color-text-inverse: #15181a;
    --color-primary: #5fb0a6;
    --color-primary-hover: #7cc1b8;
    --color-primary-active: #94d0c8;
    --color-primary-soft: #1d2e2c;
    --color-primary-tint: rgba(95, 176, 166, 0.1);
    --color-accent: #d18a4e;
    --color-accent-soft: #2c2419;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 6px 24px -8px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 24px 60px -20px rgba(0, 0, 0, 0.65);
  }
}

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

html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  hanging-punctuation: first last;
  scroll-padding-top: 5rem;
}

body {
  min-height: 100dvh;
  line-height: 1.65;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  font-feature-settings: 'ss01', 'cv11';
  overflow-x: hidden;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul[role='list'],
ol[role='list'] {
  list-style: none;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  text-wrap: balance;
  line-height: 1.12;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.01em;
}

p,
li,
figcaption {
  text-wrap: pretty;
  max-width: 70ch;
}

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

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

button {
  cursor: pointer;
  background: none;
  border: none;
  color: inherit;
}

table {
  border-collapse: collapse;
  width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ---- Layout primitives ---- */
.container {
  width: 100%;
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

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

.section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-32));
  position: relative;
}

.section--tight {
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.eyebrow::before {
  content: '';
  width: 1.75rem;
  height: 1px;
  background: var(--color-primary);
  opacity: 0.5;
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-16);
  max-width: 56ch;
}

.section-title {
  font-size: var(--text-2xl);
  font-weight: 500;
  color: var(--color-text);
}

#about .section-title {
  width: 100vw;
  margin-left: calc(-50vw + 50%);
  padding-inline: calc(50vw - 50%);
}

.section-title em {
  font-style: italic;
  color: var(--color-primary);
  font-weight: 400;
}

.section-lead {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.55;
  font-family: var(--font-display);
  font-weight: 400;
}

/* ---- Header ---- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: color-mix(in oklab, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

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

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
  gap: var(--space-6);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.logo__mark {
  height: 3rem;
  width: auto;
  flex-shrink: 0;
}

.logo__name span {
  color: var(--color-text-muted);
  font-weight: 400;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  transition: color var(--transition), background var(--transition);
  position: relative;
}

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

.nav__link.is-active {
  color: var(--color-primary);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.nav-toggle span {
  display: block;
  width: 1.1rem;
  height: 1.5px;
  background: var(--color-text);
  margin-inline: auto;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded='true'] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-toggle[aria-expanded='true'] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded='true'] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (max-width: 880px) {
  .nav,
  .header .nav-cta {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
}

/* Mobile menu */
.mobile-nav {
  position: fixed;
  top: 4.5rem;
  left: 0;
  right: 0;
  height: calc(100dvh - 4.5rem);
  background: var(--color-bg);
  z-index: 90;
  padding: var(--space-8) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transform: translateY(-100%);
  visibility: hidden;
  pointer-events: none;
  transition: transform var(--transition), visibility var(--transition);
  overflow-y: auto;
}

.mobile-nav.is-open {
  transform: translateY(0);
  visibility: visible;
  pointer-events: auto;
}

.mobile-nav__link {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-divider);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: 0.85rem 1.4rem;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  transition: all var(--transition);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.btn svg {
  width: 1.05em;
  height: 1.05em;
}

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

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

.btn--ghost {
  color: var(--color-text);
  border-color: var(--color-border);
  background: transparent;
}

.btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--link {
  padding: 0;
  color: var(--color-primary);
  gap: var(--space-1);
  font-weight: 500;
}

.btn--link svg {
  transition: transform var(--transition);
}

.btn--link:hover svg {
  transform: translate(2px, -2px);
}

/* ---- Hero ---- */
.hero {
  position: relative;
  padding-top: clamp(7rem, 14vh, 9rem);
  padding-bottom: clamp(var(--space-16), 10vw, var(--space-24));
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
}

.hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: var(--space-12);
  align-items: start;
}

.hero__visual {
  margin-top: 3rem;
}

.hero__label {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: 500;
}

.hero__label::before {
  content: '';
  width: 2.5rem;
  height: 1px;
  background: var(--color-primary);
}

.hero__title {
  font-size: var(--text-hero);
  font-weight: 500;
  line-height: 0.98;
  letter-spacing: -0.035em;
  margin-bottom: var(--space-8);
}

.hero__title em {
  font-style: italic;
  font-weight: 400;
  color: var(--color-primary);
}

.hero__role {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-4);
}

.hero__role-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--color-primary);
  position: relative;
}

.hero__role-dot::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: var(--color-primary);
  opacity: 0.25;
  animation: pulse 2.4s ease-out infinite;
}

@keyframes pulse {
  0% { transform: scale(0.6); opacity: 0.4; }
  100% { transform: scale(1.8); opacity: 0; }
}

.hero__intro {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.55;
  max-width: 46ch;
  margin-bottom: var(--space-10);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-12);
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6) var(--space-10);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}

.hero__meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero__meta-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text-faint);
}

.hero__meta-value {
  font-family: var(--font-display);
  font-size: var(--text-base);
  color: var(--color-text);
  font-weight: 500;
}

/* Hero visual card */
.hero__visual {
  position: relative;
}

.hero__card {
  position: relative;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  padding: 0;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 4 / 5;
}

.hero__card-art {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0.9;
  mix-blend-mode: normal;
}

.hero__card-caption {
  position: absolute;
  bottom: var(--space-6);
  left: var(--space-6);
  right: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
}

@media (max-width: 880px) {
  .hero__grid {
    grid-template-columns: 1fr;
  }
  .hero__visual {
    display: none;
  }
}

/* ---- About ---- */
.about__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-16);
  align-items: start;
}

.about__body p + p {
  margin-top: var(--space-5);
}

.about__body p {
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-text);
}

.about__body strong {
  color: var(--color-primary);
  font-weight: 500;
}

.facts {
  display: grid;
  gap: var(--space-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  position: relative;
  overflow: hidden;
}

.facts::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--color-primary);
}

.facts__title {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-5);
  font-weight: 500;
}

.facts__row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--color-divider);
  font-size: var(--text-sm);
}

.facts__row:last-child {
  border-bottom: none;
}

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

.facts__val {
  color: var(--color-text);
  font-weight: 500;
  text-align: right;
}

@media (max-width: 880px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }
}

/* ---- Stats ---- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.stat {
  padding: var(--space-8) var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  text-align: left;
  transition: transform var(--transition), border-color var(--transition);
}

.stat:hover {
  transform: translateY(-3px);
  border-color: var(--color-primary);
}

.stat__num {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 500;
  color: var(--color-primary);
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat__num sup {
  font-size: 0.45em;
  vertical-align: super;
}

.stat__label {
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.4;
}

@media (max-width: 880px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---- Research areas ---- */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

.research-card {
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.research-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.research-card__icon {
  width: 2.75rem;
  height: 2.75rem;
  color: var(--color-primary);
}

.research-card__title {
  font-size: var(--text-lg);
  font-weight: 500;
}

.research-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.research-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-3);
}

.tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
}

@media (max-width: 880px) {
  .research-grid {
    grid-template-columns: 1fr;
  }
}

/* ---- Capabilities / tools ---- */
.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.cap {
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.cap__head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.cap__icon {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--color-primary);
}

.cap__title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 500;
}

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

.cap__item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
  padding-block: var(--space-2);
  border-bottom: 1px dashed var(--color-divider);
}

.cap__item:last-child {
  border-bottom: none;
}

.cap__name {
  color: var(--color-text);
  font-weight: 500;
}

.cap__level {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

@media (max-width: 880px) {
  .cap-grid {
    grid-template-columns: 1fr;
  }
}

/* ---- Timeline (experience + education) ---- */
.timeline {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
}

.timeline__col-title {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-8);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.timeline__col-title svg {
  width: 1.1rem;
  height: 1.1rem;
  color: var(--color-primary);
}

.timeline__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  position: relative;
}

.timeline__list::before {
  content: '';
  position: absolute;
  left: 0.4rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: var(--color-border);
}

.tl-item {
  position: relative;
  padding-left: var(--space-8);
  padding-block: var(--space-3);
}

.tl-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 1.5rem;
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-primary);
}

.tl-item__period {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  margin-bottom: var(--space-1);
  letter-spacing: 0.04em;
}

.tl-item__role {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 2px;
}

.tl-item__org {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.tl-item__detail {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

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

@media (max-width: 880px) {
  .timeline {
    grid-template-columns: 1fr;
    gap: var(--space-16);
  }
}

/* ---- Teaching ---- */
.teach-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.teach-card {
  padding: var(--space-6);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  transition: border-color var(--transition);
}

.teach-card:hover {
  border-color: var(--color-primary);
}

.teach-card__icon {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 3px;
}

.teach-card__text {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 500;
  line-height: 1.4;
}

@media (max-width: 880px) {
  .teach-grid {
    grid-template-columns: 1fr;
  }
}

/* ---- Publications ---- */
.pubs-list {
  display: flex;
  flex-direction: column;
}

.pub {
  display: grid;
  grid-template-columns: 4.75rem 1fr auto;
  gap: var(--space-6);
  align-items: start;
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-divider);
  transition: background var(--transition);
}

.pub:first-child {
  border-top: 1px solid var(--color-divider);
}

.pub:hover {
  background: var(--color-primary-tint);
}

.pub__year {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-primary);
  line-height: 1;
  padding-top: 0.15em;
}

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

.pub__title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.4;
}

.pub__meta {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.pub__meta em {
  font-style: italic;
}

.pub__cites {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: right;
  white-space: nowrap;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.pub__cites strong {
  color: var(--color-primary);
  font-size: var(--text-sm);
}

@media (max-width: 880px) {
  .pub {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }
  .pub__cites {
    flex-direction: row;
    align-items: center;
    gap: var(--space-2);
  }
}

/* ---- Contact ---- */
.contact__grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-12);
  align-items: start;
}

.contact-card {
  background: linear-gradient(160deg, var(--color-primary), var(--color-primary-hover));
  color: var(--color-text-inverse);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  position: relative;
  overflow: hidden;
}

.contact-card__art {
  position: absolute;
  right: -2rem;
  bottom: -2rem;
  width: 12rem;
  height: 12rem;
  opacity: 0.14;
  color: var(--color-text-inverse);
}

.contact-card h3 {
  color: var(--color-text-inverse);
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.contact-card p {
  color: rgba(255, 255, 255, 0.82);
  font-size: var(--text-sm);
  margin-bottom: var(--space-8);
  max-width: 32ch;
}

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

.contact-list a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--text-sm);
}

.contact-list a:hover {
  color: #fff;
}

.contact-list svg {
  width: 1.1rem;
  height: 1.1rem;
  flex-shrink: 0;
  opacity: 0.8;
}

.socials {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-8);
}

.social {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #fff;
  transition: background var(--transition), border-color var(--transition);
}

.social:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.6);
}

.social svg {
  width: 1.1rem;
  height: 1.1rem;
}

/* Form */
.form {
  display: grid;
  gap: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
}

.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

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

.field label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  font-weight: 500;
}

.field input,
.field textarea {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.8rem 1rem;
  font-size: var(--text-sm);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
  font-family: var(--font-body);
}

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-tint);
}

.field textarea {
  resize: vertical;
  min-height: 7rem;
}

.field--error input,
.field--error textarea {
  border-color: #c0392b;
  box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.1);
}

.field__error {
  font-size: var(--text-xs);
  color: #c0392b;
  margin-top: -4px;
}

.form__message {
  padding: 0.8rem 1rem;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
}

.form__message--success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.form__message--error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

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

button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

@media (max-width: 880px) {
  .contact__grid {
    grid-template-columns: 1fr;
  }
  .form__row {
    grid-template-columns: 1fr;
  }
}

/* ---- Footer ---- */
.footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-12);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.footer__credit {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__credit strong {
  color: var(--color-text);
  font-weight: 500;
}

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

.footer__links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__links a:hover {
  color: var(--color-primary);
}

/* ---- Scroll reveal ---- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---- Divider band ---- */
.band {
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}

/* Marquee strip */
.marquee {
  overflow: hidden;
  border-block: 1px solid var(--color-border);
  background: var(--color-surface-offset);
  padding-block: var(--space-5);
}

.marquee__track {
  display: flex;
  gap: var(--space-12);
  white-space: nowrap;
  animation: marquee 36s linear infinite;
  width: max-content;
}

.marquee__item {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-xl);
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  gap: var(--space-12);
}

.marquee__item::after {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}

@keyframes marquee {
  to { transform: translateX(-50%); }
}

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