/* =============================================
   SEBASTIAN JEUDY — PERSONAL PORTFOLIO
   Palette: Deep navy + slate blue accent
   Fonts: Playfair Display (display) + DM Sans (body)
   ============================================= */

/* ── Design Tokens ── */
:root,
[data-theme="light"] {
  --color-bg: #f5f4f0;
  --color-surface: #ffffff;
  --color-surface-2: #faf9f7;
  --color-surface-offset: #eeece7;
  --color-border: #ddd9d2;
  --color-divider: #e4e1db;
  --color-text: #1a1914;
  --color-text-muted: #6b6860;
  --color-text-faint: #b0ada6;
  --color-text-inverse: #f5f4f0;
  --color-primary: #2c4a7c;
  --color-primary-hover: #1e3560;
  --color-primary-light: #dde4f0;
  --color-navy: #1b2a4a;
  --color-navy-light: #e8ecf5;

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;

  --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);

  --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;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.07);
  --shadow-md: 0 4px 16px rgba(0,0,0,.09);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.13);

  --transition: 200ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-default: 1100px;
  --content-narrow: 720px;
}

[data-theme="dark"] {
  --color-bg: #0d1117;
  --color-surface: #131822;
  --color-surface-2: #18202e;
  --color-surface-offset: #1a2235;
  --color-border: #253047;
  --color-divider: #1e2b40;
  --color-text: #e4e8f0;
  --color-text-muted: #8494b0;
  --color-text-faint: #4a5a78;
  --color-text-inverse: #0d1117;
  --color-primary: #6d9bd4;
  --color-primary-hover: #8fb6e8;
  --color-primary-light: #162035;
  --color-navy: #2a3d6a;
  --color-navy-light: #1a2035;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,.5);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.65);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0d1117;
    --color-surface: #131822;
    --color-surface-2: #18202e;
    --color-surface-offset: #1a2235;
    --color-border: #253047;
    --color-divider: #1e2b40;
    --color-text: #e4e8f0;
    --color-text-muted: #8494b0;
    --color-text-faint: #4a5a78;
    --color-text-inverse: #0d1117;
    --color-primary: #6d9bd4;
    --color-primary-hover: #8fb6e8;
    --color-primary-light: #162035;
    --color-navy: #2a3d6a;
    --color-navy-light: #1a2035;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.4);
    --shadow-md: 0 4px 16px rgba(0,0,0,.5);
    --shadow-lg: 0 12px 40px rgba(0,0,0,.65);
  }
}

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

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-20);
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.65;
}

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: 1.15; font-family: var(--font-display); }
p, li { text-wrap: pretty; max-width: 72ch; }
button { cursor: pointer; background: none; border: none; }
a { color: inherit; text-decoration: none; }

::selection { background: color-mix(in srgb, var(--color-primary) 25%, transparent); color: var(--color-text); }
: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;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ── Layout ── */
.container {
  width: 100%;
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
}

/* ── Header ── */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow var(--transition);
}
.header--scrolled { box-shadow: var(--shadow-sm); }

.header__inner {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
  height: 68px;
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.01em;
  flex-shrink: 0;
}
.logo svg { color: var(--color-primary); }

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
}
.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav__link:hover { color: var(--color-text); background: var(--color-surface-offset); }
.nav__link--cta {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-weight: 600;
  margin-left: var(--space-2);
  white-space: nowrap;
}
.nav__link--cta:hover { background: var(--color-primary-hover); color: var(--color-text-inverse); }

.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  flex-shrink: 0;
}
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface-offset); }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.nav__toggle:hover { background: var(--color-surface-offset); }
.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav__toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.open span:nth-child(2) { opacity: 0; }
.nav__toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav__mobile {
  display: none;
  flex-direction: column;
  padding: var(--space-4) clamp(var(--space-6), 5vw, var(--space-16)) var(--space-6);
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
}
.nav__mobile.open { display: flex; }
.nav__mobile-link {
  padding: var(--space-3) var(--space-2);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-divider);
  transition: color var(--transition);
}
.nav__mobile-link:hover { color: var(--color-primary); }

@media (max-width: 768px) {
  .nav { display: none; }
  .nav__toggle { display: flex; }
}

/* ── Hero ── */
.hero {
  position: relative;
  min-height: calc(90svh - 68px);
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--color-bg);
}

.hero__bg-pattern {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 70% 30%, color-mix(in srgb, var(--color-primary) 8%, transparent) 0%, transparent 55%),
    radial-gradient(circle at 20% 80%, color-mix(in srgb, var(--color-navy) 10%, transparent) 0%, transparent 45%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
  padding-block: var(--space-12);
  display: grid;
  grid-template-columns: 1fr 420px;
  align-items: center;
  gap: clamp(var(--space-8), 5vw, var(--space-16));
  width: 100%;
}

.hero__eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}

.hero__name {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.05;
  margin-bottom: var(--space-6);
}
.hero__name--bold {
  font-family: 'DM Serif Display', Georgia, serif;
  font-weight: 400;
  font-style: normal;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.hero__tagline {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  font-weight: 300;
  max-width: 46ch;
  line-height: 1.6;
  margin-bottom: var(--space-10);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-body);
  transition: background var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.btn:hover { transform: translateY(-1px); }
.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--color-primary) 35%, transparent);
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 6px 24px color-mix(in srgb, var(--color-primary) 45%, transparent);
}
.btn--ghost {
  border: 1.5px solid var(--color-border);
  color: var(--color-text-muted);
}
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

.hero__photo-wrap {
  position: relative;
  display: flex;
  justify-content: center;
}
.hero__photo-frame {
  position: absolute;
  inset: -12px;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  opacity: 0.35;
  transform: rotate(2.5deg);
  pointer-events: none;
}
.hero__photo {
  width: 100%;
  max-width: 420px;
  height: auto;
  aspect-ratio: 3/4;
  object-fit: cover;
  object-position: top;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.hero__scroll-hint {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-text-faint);
  animation: bounce 2s ease-in-out infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: color var(--transition);
}
.hero__scroll-hint:hover { color: var(--color-primary); }
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

@media (max-width: 900px) {
  .hero__inner {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
  }
  .hero__tagline { max-width: 100%; }
  .hero__actions { justify-content: center; }
  .hero__photo-wrap { max-width: 300px; width: 100%; }
}

/* ── Sections ── */
.section {
  padding-block: clamp(var(--space-10), 5vw, var(--space-16));
}

.section__label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.section__heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.section__sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

/* ── About ── */
.about { background: var(--color-surface); }

.about__grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: clamp(var(--space-8), 4vw, var(--space-12));
  align-items: start;
}

.about__body {
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-5);
}
.about__body:last-of-type { margin-bottom: var(--space-8); }

.about__detail-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
}
.about__detail {
  display: flex;
  gap: var(--space-4);
  align-items: baseline;
  font-size: var(--text-sm);
}
.about__detail-label {
  font-weight: 600;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--text-xs);
  min-width: 80px;
}
.about__detail a { color: var(--color-primary); }
.about__detail a:hover { color: var(--color-primary-hover); text-decoration: underline; }

.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.stat-card {
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  aspect-ratio: 1 / 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-3);
  transition: box-shadow var(--transition), transform var(--transition);
  overflow: hidden;
}
.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.stat-card__num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.1;
  white-space: nowrap;
}
.stat-card__num--sm {
  font-size: clamp(1.4rem, 2.8vw, 2rem);
}
.stat-card__label {
  font-size: clamp(0.75rem, 1.1vw, 0.9rem);
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.03em;
  line-height: 1.4;
}

@media (max-width: 820px) {
  .about__grid { grid-template-columns: 1fr; }
  .about__stats { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 560px) {
  .about__stats { grid-template-columns: 1fr 1fr; }
  .stat-card__num {
    font-size: clamp(1.5rem, 6vw, 2rem);
  }
  .stat-card__num--sm {
    font-size: clamp(1.1rem, 4.5vw, 1.5rem);
  }
  .stat-card__label {
    font-size: 0.8rem;
  }
}

/* ── Experience ── */
.experience { background: var(--color-bg); }

.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.timeline__item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-6);
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-divider);
  transition: background var(--transition);
}
.timeline__item:last-child { border-bottom: none; }

.timeline__meta {
  padding-top: var(--space-1);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.timeline__date {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-faint);
  letter-spacing: 0.02em;
}
.timeline__tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 3px var(--space-3);
  border-radius: var(--radius-full);
  width: fit-content;
}

.timeline__org-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}
.timeline__org-icon {
  width: 42px;
  height: 42px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}
.timeline__role {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.timeline__org {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}
.timeline__desc {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.75;
  max-width: 70ch;
  margin-bottom: var(--space-4);
}
.timeline__skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.timeline__skills span {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 3px var(--space-3);
  border-radius: var(--radius-full);
}

@media (max-width: 640px) {
  .timeline__item { grid-template-columns: 1fr; gap: var(--space-4); }
  .timeline__meta { flex-direction: row; align-items: center; }
}

/* ── Education ── */
.education {
  background: var(--color-surface);
}

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

.edu__grid > .edu__card:first-child {
  grid-column: 1 / -1;
}

.edu__card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
  transition: box-shadow var(--transition), transform var(--transition);
}
.edu__card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.edu__card--primary { border-color: var(--color-primary); border-left-width: 3px; }

.edu__icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.edu__school {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.edu__degree {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: var(--space-2);
}
.edu__dates {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-5);
}
.edu__latin-honors {
  display: inline-block;
  font-weight: 700;
  color: var(--color-primary);
  font-style: italic;
  font-family: var(--font-display);
  letter-spacing: 0.02em;
}

.edu__activities { margin-top: var(--space-2); }
.edu__activities-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}
.edu__activities ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.edu__activities li {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  padding-left: var(--space-4);
  position: relative;
  max-width: none;
}
.edu__activities li::before {
  content: '·';
  position: absolute;
  left: var(--space-2);
  color: var(--color-primary);
  font-size: 1.1em;
}

.edu__gpa {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  margin-top: var(--space-4);
}
.edu__gpa-num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
}
.edu__gpa-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

@media (max-width: 640px) {
  .edu__grid { grid-template-columns: 1fr; }
}

/* ── Skills ── */
.skills { background: var(--color-bg); }

.skills--dark .section__label {
  color: rgba(255,255,255,0.6);
}
.skills--dark .section__heading {
  color: #ffffff;
}
.skills--dark .skill-pill {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.9);
}
.skills--dark .skill-pill svg {
  color: rgba(255,255,255,0.7);
}
.skills--dark .skill-pill:hover {
  background: rgba(255,255,255,0.18);
  border-color: rgba(255,255,255,0.4);
  color: #ffffff;
  box-shadow: none;
}

.skills__grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

@media (max-width: 599px) {
  .skills__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}

.skill-pill {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full);
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.skill-pill svg { color: var(--color-primary); flex-shrink: 0; }
.skill-pill:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}

/* ── Involvement ── */
.involvement { background: var(--color-surface); }

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

.involvement__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.involvement__item:hover { box-shadow: var(--shadow-sm); }

.involvement__item summary {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  cursor: pointer;
  user-select: none;
}
.involvement__item summary::-webkit-details-marker { display: none; }

.involvement__summary-main {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.involvement__icon {
  width: 40px;
  height: 40px;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.involvement__title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
}
.involvement__role-date {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.involvement__chevron {
  color: var(--color-text-faint);
  transition: transform var(--transition);
  flex-shrink: 0;
}
.involvement__item[open] .involvement__chevron {
  transform: rotate(180deg);
}

.involvement__body {
  padding: 0 var(--space-6) var(--space-5);
  padding-left: calc(var(--space-6) + 40px + var(--space-4));
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.7;
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-4);
}

/* ── Certifications ── */
.certifications { background: var(--color-bg); }

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

.cert__card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.cert__card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

.cert__icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.cert__name {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
  line-height: 1.3;
}
.cert__issuer {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: var(--space-3);
}
.cert__meta {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.cert__date {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  padding: 2px var(--space-3);
  border-radius: var(--radius-full);
}
.cert__skill {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px var(--space-3);
  border-radius: var(--radius-full);
}

@media (max-width: 640px) {
  .cert__grid { grid-template-columns: 1fr; }
}

/* ── Contact ── */
.contact { background: var(--color-surface); }

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

.contact__cta-top {
  display: flex;
  gap: var(--space-4);
}

.contact__cta-top .contact__cta-btn {
  flex: 1;
  justify-content: center;
}

.contact__cta-bottom {
  display: flex;
  justify-content: center;
}

.contact__cta-bottom .contact__cta-btn {
  justify-content: center;
}

@media (min-width: 600px) {
  .contact__cta-row {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
  }
  .contact__cta-top {
    display: contents;
  }
  .contact__cta-bottom {
    display: contents;
  }
  .contact__cta-top .contact__cta-btn,
  .contact__cta-bottom .contact__cta-btn {
    flex: unset;
    justify-content: flex-start;
  }
}

.contact__cta-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-body);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  text-decoration: none;
  box-shadow: 0 4px 16px color-mix(in srgb, var(--color-primary) 35%, transparent);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.contact__cta-btn:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px color-mix(in srgb, var(--color-primary) 45%, transparent);
}
.contact__cta-btn--static {
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  box-shadow: none;
  cursor: default;
}
.contact__cta-btn--static:hover {
  background: var(--color-surface-offset);
  transform: none;
  box-shadow: none;
}

.contact__sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 58ch;
  margin-bottom: var(--space-10);
  line-height: 1.7;
}

.contact__cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.contact__card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
a.contact__card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--color-primary);
}

.contact__card-icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}
.contact__card-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-1);
}
.contact__card-val {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  max-width: 28ch;
  word-break: break-word;
}

@media (max-width: 720px) {
  .contact__cards { grid-template-columns: 1fr; }
}

/* ── Footer ── */
.footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-10);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer__name {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
}
.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer__email {
  font-size: var(--text-xs);
  color: var(--color-primary);
  transition: color var(--transition);
}
.footer__email:hover { color: var(--color-primary-hover); text-decoration: underline; }

@media (max-width: 600px) {
  .footer__inner { flex-direction: column; text-align: center; }
}

/* ── Scroll animations ── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: none;
}