/* ============================================================
   Sara Malvar — personal site
   Modern minimal · dark/light · blue accent
   ============================================================ */

:root {
  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 1080px;
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --transition: 0.25s ease;
  /* fallbacks (themes override these) */
  --accent: #4a5fb0;
  --accent-soft: rgba(74, 95, 176, 0.10);
  --accent-hover: #3d5099;
  --accent-contrast: #ffffff;
}

/* ---- Dark (default) ---- */
[data-theme="dark"] {
  --bg: #0f1012;
  --bg-soft: #15161b;
  --card: #181a1f;
  --border: #272a32;
  --text: #e9eaed;
  --text-soft: #a4a8b2;
  --text-muted: #71747d;
  --accent: #7f91cf;
  --accent-soft: rgba(127, 145, 207, 0.12);
  --accent-hover: #909fd8;
  --accent-contrast: #11131a;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.30);
}

/* ---- Light ---- */
[data-theme="light"] {
  --bg: #fcfcfd;
  --bg-soft: #f3f4f6;
  --card: #ffffff;
  --border: #e6e8ec;
  --text: #14161c;
  --text-soft: #4a4f5c;
  --text-muted: #767a84;
  --accent: #4a5fb0;
  --accent-soft: rgba(74, 95, 176, 0.10);
  --accent-hover: #3d5099;
  --accent-contrast: #ffffff;
  --shadow: 0 12px 30px rgba(20, 25, 40, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

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

h1, h2, h3 { line-height: 1.2; font-weight: 700; letter-spacing: -0.02em; }

.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--accent); color: #fff;
  padding: 10px 16px; border-radius: 0 0 8px 0; z-index: 1000;
}
.skip-link:focus { left: 0; color: #fff; }

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; border-radius: 999px;
  font-weight: 600; font-size: 0.94rem;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  cursor: pointer; transition: all var(--transition); white-space: nowrap;
}
.btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: var(--accent-contrast); }
.btn--primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--accent-contrast); }
.btn--small { padding: 8px 16px; font-size: 0.85rem; }

/* ---------------- Nav ---------------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: saturate(160%) blur(12px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.nav__brand { font-family: var(--font-display); font-weight: 600; font-size: 1.4rem; color: var(--text); letter-spacing: 0; }
.nav__dot { color: var(--accent); }
.nav__links { display: flex; gap: 26px; }
.nav__links a { color: var(--text-soft); font-weight: 500; font-size: 0.92rem; position: relative; }
.nav__links a:hover { color: var(--text); }
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 2px;
  background: var(--accent); border-radius: 2px; transition: width var(--transition);
}
.nav__links a:hover::after { width: 100%; }
.nav__actions { display: flex; align-items: center; gap: 12px; }

.theme-toggle {
  display: grid; place-items: center; width: 40px; height: 40px;
  border-radius: 50%; border: 1px solid var(--border); background: var(--card);
  color: var(--text); cursor: pointer; transition: all var(--transition);
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.icon-sun { display: none; }
[data-theme="light"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: none; }

.nav__burger { display: none; flex-direction: column; gap: 5px; width: 40px; height: 40px;
  align-items: center; justify-content: center; background: var(--card);
  border: 1px solid var(--border); border-radius: 10px; cursor: pointer; }
.nav__burger span { width: 18px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--transition); }

/* ---------------- Hero ---------------- */
.hero {
  display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 56px; align-items: center;
  padding: clamp(56px, 9vw, 110px) 24px clamp(40px, 6vw, 72px);
}
.eyebrow {
  text-transform: uppercase; letter-spacing: 0.18em; font-size: 0.78rem; font-weight: 600;
  color: var(--accent); margin-bottom: 14px;
}
.hero__title { font-family: var(--font-display); font-size: clamp(2.8rem, 7vw, 4.6rem); font-weight: 600; }
.hero__lead { font-size: clamp(1.05rem, 2.2vw, 1.3rem); color: var(--text-soft); margin: 20px 0 30px; max-width: 32ch; }
.hero__lead strong { color: var(--text); font-weight: 600; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; }

.socials { list-style: none; display: flex; gap: 12px; margin-top: 34px; }
.socials a {
  display: grid; place-items: center; width: 44px; height: 44px; border-radius: 12px;
  border: 1px solid var(--border); background: var(--card); color: var(--text-soft);
  transition: all var(--transition);
}
.socials a:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-3px); }

.hero__media { display: flex; flex-direction: column; align-items: center; gap: 28px; }
.avatar {
  position: relative; width: clamp(180px, 24vw, 250px); aspect-ratio: 1; border-radius: 26px;
  overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow);
  background: linear-gradient(145deg, var(--accent-soft), var(--bg-soft));
  display: grid; place-items: center;
}
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.avatar__fallback { display: none; font-family: var(--font-display); font-size: 4rem; font-weight: 600; color: var(--accent); }
.avatar--placeholder .avatar__fallback { display: block; }

.stats { list-style: none; display: flex; gap: 22px; flex-wrap: wrap; justify-content: center; }
.stats li { display: flex; flex-direction: column; align-items: center; }
.stats strong { font-family: var(--font-display); font-size: 1.7rem; font-weight: 600; color: var(--text); }
.stats span { font-size: 0.78rem; color: var(--text-muted); }

/* ---------------- Sections ---------------- */
.section { padding: clamp(48px, 7vw, 88px) 24px; border-top: 1px solid var(--border); }
.section__head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 40px; }
.section__head h2 { font-size: clamp(1.7rem, 4vw, 2.4rem); }

.muted { color: var(--text-muted); font-size: 0.9rem; margin-top: 20px; }
.muted code { background: var(--bg-soft); padding: 2px 7px; border-radius: 6px; font-size: 0.85em; }

/* ---------------- About ---------------- */
.about { display: block; max-width: none; width: 100%; }
.about__lead { width: 100%; }
.about__lead p { color: var(--text-soft); margin-bottom: 18px; font-size: 1.05rem; }
.about__lead strong { color: var(--text); }
.about__side h3 { font-size: 1rem; margin-bottom: 16px; color: var(--text); }
.tags { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; }
.tags li {
  padding: 7px 14px; border-radius: 999px; background: var(--accent-soft);
  color: var(--accent); font-size: 0.85rem; font-weight: 500;
}

/* ---------------- Cards (projects) ---------------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 22px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; transition: all var(--transition);
}
.card:hover { transform: translateY(-5px); border-color: var(--accent); box-shadow: var(--shadow); }
.card h3 { font-size: 1.18rem; margin-bottom: 12px; }
.card p { color: var(--text-soft); font-size: 0.96rem; }
.card__tags { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.card__tags li { font-size: 0.76rem; color: var(--text-muted); border: 1px solid var(--border); padding: 4px 10px; border-radius: 999px; }

/* ---------------- Latest projects ---------------- */
.project-showcase { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 24px; align-items: stretch; }
.project-card {
  position: relative; overflow: hidden; background: var(--card); border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 8px); padding: clamp(26px, 4vw, 38px);
  min-height: 430px; display: flex; flex-direction: column; transition: all var(--transition);
}
.project-card--primary {
  background: var(--bg-soft);
  border-color: color-mix(in srgb, var(--accent) 26%, var(--border));
}
.project-card:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: var(--shadow); }
.project-card h3 { font-size: clamp(1.45rem, 3vw, 2rem); line-height: 1.15; margin-bottom: 16px; }
.project-card p { color: var(--text-soft); font-size: 1rem; line-height: 1.65; }
.project-card__bullets {
  list-style: none; display: grid; gap: 10px; margin: 24px 0; color: var(--text-soft);
}
.project-card__bullets li {
  position: relative; padding-left: 22px; font-size: 0.95rem; line-height: 1.45;
}
.project-card__bullets li::before {
  content: ""; position: absolute; left: 2px; top: 0.62em; width: 6px; height: 6px;
  border-radius: 50%; background: var(--accent);
}
.project-card__links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: auto; }
.project-card__links a {
  border: 1px solid var(--border); border-radius: 999px; padding: 8px 13px;
  color: var(--text); font-size: 0.86rem; font-weight: 600; background: var(--bg-soft);
}
.project-card__links a:hover { border-color: var(--accent); color: var(--accent); }

/* ---------------- Publications ---------------- */
.pubs { list-style: none; display: flex; flex-direction: column; gap: 4px; }
.pub { display: grid; grid-template-columns: 70px 1fr; gap: 18px; padding: 20px 14px; border-radius: var(--radius-sm); transition: background var(--transition); }
.pub:hover { background: var(--bg-soft); }
.pub__year { font-family: var(--font-display); font-weight: 600; color: var(--accent); font-size: 1.05rem; }
.pub__title { display: inline-block; font-weight: 600; color: var(--text); font-size: 1.05rem; }
.pub__title:hover { color: var(--accent); }
.pub__authors { color: var(--text-soft); font-size: 0.92rem; margin-top: 4px; }
.pub__venue { color: var(--text-muted); font-size: 0.85rem; margin-top: 2px; }

/* ---------------- Patents ---------------- */
.patents-group { margin-bottom: 34px; }
.patents-group__title { font-size: 1rem; color: var(--text-muted); text-transform: uppercase;
  letter-spacing: 0.12em; margin-bottom: 16px; }
.patents { list-style: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; }
.patent {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 18px 20px; transition: all var(--transition);
}
.patent:hover { border-color: var(--accent); transform: translateY(-3px); }
.patent__title { display: block; font-size: 1rem; font-weight: 600; color: var(--text); margin-bottom: 8px; }
a.patent__title:hover { color: var(--accent); }
.patent__meta { font-size: 0.85rem; color: var(--text-muted); display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.badge { font-size: 0.72rem; font-weight: 600; padding: 3px 10px; border-radius: 999px;
  background: rgba(64, 160, 110, 0.12); color: #54a87b; }
.badge--pending { background: rgba(196, 160, 70, 0.12); color: #c0a259; }

/* ---------------- Experience ---------------- */
.cv__download { margin-bottom: 40px; }
.cv__subhead {
  font-size: 1rem; color: var(--text-muted); text-transform: uppercase;
  letter-spacing: 0.12em; margin: 44px 0 30px;
}

/* logo chip — normalizes logos of different native sizes onto a uniform white tile */
.logo-chip {
  display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto;
  width: 46px; height: 46px; padding: 9px; border-radius: 13px; background: #fff;
  border: 1px solid rgba(17, 21, 31, 0.10); box-shadow: 0 4px 12px rgba(0, 0, 0, 0.10);
}
.logo-chip img { max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; display: block; }
.logo-chip--text { color: #11151f; font: 800 0.82rem/1 var(--font-display); letter-spacing: 0.04em; }

/* timeline slider */
.experience-slider { position: relative; margin-bottom: 8px; }
.experience-slider__top {
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
}
.experience-slider__top .cv__subhead { margin-top: 12px; }
.experience-slider__controls { display: flex; gap: 10px; }
.timeline-btn {
  display: grid; place-items: center; width: 42px; height: 42px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  cursor: pointer; font-size: 1.05rem; transition: all var(--transition);
}
.timeline-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.timeline-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.experience-slider__viewport {
  position: relative; overflow-x: auto; scroll-snap-type: x mandatory; scroll-behavior: smooth;
  scrollbar-width: none; padding: 6px 2px 8px;
}
.experience-slider__viewport::-webkit-scrollbar { display: none; }
.experience-slider__track {
  --slide-width: min(76vw, 430px);
  --exp-gap: 26px;
  display: grid; grid-auto-flow: column; grid-auto-columns: var(--slide-width);
  gap: var(--exp-gap); position: relative; align-items: stretch; padding-top: 28px;
}
.experience-slide {
  position: relative; display: flex; flex-direction: column; align-items: flex-start;
  scroll-snap-align: start; min-width: 0;
}
.experience-slide__marker { position: relative; z-index: 1; margin-bottom: 14px; }
/* each marker draws the line segment connecting it to the next node */
.experience-slide__marker::after {
  content: ""; position: absolute; top: 30px; left: 58px;
  width: calc(var(--slide-width) + var(--exp-gap) - 58px); height: 2px;
  background: color-mix(in srgb, var(--accent) 45%, var(--border));
  z-index: 0; pointer-events: none;
}
.experience-slide:last-child .experience-slide__marker::after { display: none; }
.experience-slide__marker .logo-chip {
  width: 62px; height: 62px; padding: 11px; border: 4px solid var(--bg);
  box-shadow: 0 0 0 1px var(--border), 0 6px 16px rgba(0, 0, 0, 0.22);
}
.experience-slide__date {
  display: inline-block; font-size: 0.74rem; font-weight: 700; letter-spacing: 0.07em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 12px;
}
.experience-slide__card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; width: 100%; min-height: 255px; transition: all var(--transition);
}
.experience-slide__card:hover { transform: translateY(-5px); border-color: var(--accent); box-shadow: var(--shadow); }
.experience-slide__card h3 { font-size: 1.05rem; line-height: 1.3; margin-bottom: 6px; }
.experience-slide__org { color: var(--accent); font-size: 0.84rem; font-weight: 600; margin-bottom: 10px; }
.experience-slide__card p { color: var(--text-soft); font-size: 0.89rem; line-height: 1.55; }
.experience-slide__bullets { list-style: disc; padding-left: 18px; margin-top: 10px; color: var(--text-soft); }
.experience-slide__bullets li { margin-bottom: 6px; font-size: 0.86rem; line-height: 1.45; }
.experience-slider__dots { display: flex; justify-content: center; gap: 9px; margin-top: 18px; }
.experience-slider__dot {
  width: 10px; height: 10px; border-radius: 50%; border: 0; background: var(--border);
  cursor: pointer; transition: all var(--transition);
}
.experience-slider__dot.is-active { width: 26px; border-radius: 999px; background: var(--accent); }

/* education cards */
.edu {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-auto-rows: 1fr;
  gap: 22px;
  align-items: stretch;
}
.edu__card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; min-height: 190px; display: flex; flex-direction: column; gap: 18px;
  height: 100%; transition: all var(--transition);
}
.edu__card:hover { transform: translateY(-5px); border-color: var(--accent); box-shadow: var(--shadow); }
.edu__logos { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; min-height: 46px; }
.edu__body { display: flex; flex: 1; flex-direction: column; justify-content: flex-start; }
.edu__years {
  display: inline-block; color: var(--accent); font-size: 0.74rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 8px;
}
.edu__card h3 { font-size: 1.05rem; line-height: 1.32; margin-bottom: 8px; }
.edu__card p { color: var(--text-soft); font-size: 0.92rem; line-height: 1.5; }

/* ---------------- Mentoring ---------------- */
.mentoring { display: grid; grid-template-columns: 1.6fr 1fr; gap: 40px; align-items: start; }
.mentoring__text p { color: var(--text-soft); font-size: 1.08rem; }
.mentoring__text strong { color: var(--text); }
.check { list-style: none; display: grid; gap: 12px; margin: 26px 0 0; }
.check li { position: relative; padding-left: 32px; color: var(--text-soft); }
.check li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  width: 22px; height: 22px; border-radius: 50%; background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center; font-size: 0.8rem; font-weight: 700;
}
.mentoring__cta {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; display: flex; flex-direction: column; gap: 18px; align-items: flex-start;
  box-shadow: var(--shadow);
}
.rating { display: flex; flex-direction: column; gap: 4px; }
.rating__score { font-family: var(--font-display); font-size: 2.6rem; font-weight: 600; line-height: 1; color: var(--text); }
.rating__stars { color: #d6a548; font-size: 1.15rem; letter-spacing: 2px; }
.rating__label { color: var(--text-muted); font-size: 0.85rem; }
.rating__proof {
  width: 100%; padding: 16px; border-radius: calc(var(--radius) - 8px);
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text-soft);
}
.rating__proof strong { display: block; color: var(--text); font-size: 1.05rem; margin-bottom: 4px; }
.rating__proof span { font-size: 0.9rem; }

.testimonials__intro {
  margin-top: 44px; display: flex; align-items: center; gap: 12px;
  color: var(--text-muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.12em;
}
.testimonials__intro::after { content: ""; height: 1px; flex: 1; background: var(--border); }
.testimonials {
  margin-top: 18px; display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px;
}
.reviews-carousel { margin-top: 18px; }
.reviews-carousel .testimonials { margin-top: 0; }
.reviews-carousel__controls { display: none; }
.reviews-carousel.is-enhanced {
  position: relative; border: 1px solid var(--border); border-radius: calc(var(--radius) + 8px);
  padding: clamp(14px, 3vw, 24px); background: var(--card);
  box-shadow: var(--shadow);
}
.reviews-carousel.is-enhanced .reviews-carousel__viewport {
  overflow: hidden; border-radius: var(--radius);
}
.reviews-carousel.is-enhanced .reviews-carousel__track {
  display: flex; gap: 0; transition: transform 0.35s ease; will-change: transform;
}
.reviews-carousel.is-enhanced .reviews-carousel__slide {
  flex: 0 0 100%; min-width: 100%; border-color: var(--border);
  background: var(--bg-soft); box-shadow: none;
}
.reviews-carousel.is-enhanced .reviews-carousel__slide:hover {
  transform: none; border-color: var(--border); box-shadow: none;
}
.reviews-carousel.is-enhanced .reviews-carousel__controls {
  display: flex; align-items: center; justify-content: center; gap: 14px; margin-top: 18px;
}
.reviews-carousel__button {
  display: grid; place-items: center; width: 42px; height: 42px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  cursor: pointer; transition: all var(--transition); font-size: 1.15rem;
}
.reviews-carousel__button:hover,
.reviews-carousel__button:focus-visible {
  border-color: var(--accent); color: var(--accent); transform: translateY(-2px);
}
.reviews-carousel__dots { display: flex; align-items: center; justify-content: center; gap: 8px; }
.reviews-carousel__dot {
  width: 10px; height: 10px; border-radius: 999px; border: 0; background: var(--border);
  cursor: pointer; transition: all var(--transition);
}
.reviews-carousel__dot[aria-current="true"] { width: 28px; background: var(--accent); }
.testimonial {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; display: flex; flex-direction: column; gap: 14px; transition: all var(--transition);
}
.testimonial:hover { transform: translateY(-5px); border-color: var(--accent); box-shadow: var(--shadow); }
.testimonial__stars { color: #d6a548; font-size: 0.95rem; letter-spacing: 2px; }
.testimonial blockquote { color: var(--text-soft); font-size: 0.97rem; line-height: 1.6; flex: 1; }
.testimonial figcaption { display: flex; flex-direction: column; gap: 2px; border-top: 1px solid var(--border); padding-top: 14px; }
.testimonial__name { font-weight: 600; color: var(--text); }
.testimonial__role { font-size: 0.8rem; color: var(--text-muted); }

/* ---------------- Contact ---------------- */
.contact__lead { font-size: clamp(1.1rem, 2.5vw, 1.4rem); color: var(--text-soft); max-width: 36ch; margin-bottom: 28px; }
.contact__actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* ---------------- Footer ---------------- */
.footer { border-top: 1px solid var(--border); padding: 32px 24px; margin-top: 20px; }
.footer__inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.footer p { color: var(--text-muted); font-size: 0.9rem; }
.footer__top { color: var(--text-soft); font-size: 0.9rem; font-weight: 500; }

/* ---------------- Reveal on scroll ---------------- */
.section, .hero { opacity: 1; }
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .reviews-carousel.is-enhanced .reviews-carousel__track { transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------------- Responsive ---------------- */
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; gap: 40px; }
  .hero__media { order: -1; flex-direction: row; flex-wrap: wrap; justify-content: flex-start; }
  .about { display: block; }
  .project-showcase { grid-template-columns: 1fr; }
  .project-card { min-height: auto; }
  .mentoring { grid-template-columns: 1fr; gap: 28px; }
  .experience-slider__track { --slide-width: min(84vw, 390px); }
  .nav__links { display: none; }
  .nav__burger { display: flex; }
  .nav.open .nav__links {
    display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--border); padding: 18px 24px; gap: 16px;
  }
  .nav__links a::after { display: none; }
  .edu { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
}
@media (max-width: 520px) {
  .hero__cta { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
  .nav__brand { font-size: 1.2rem; }
  .pub { grid-template-columns: 1fr; gap: 6px; }
  .edu { grid-template-columns: 1fr; }
  .experience-slider__top { align-items: flex-start; flex-direction: column; }
  .experience-slider__controls { align-self: flex-end; }
  .experience-slider__track { --slide-width: calc(100vw - 56px); --exp-gap: 18px; }
  .experience-slide__card { min-height: auto; }
}