/* =========================================================================
   Muhammet Ertuğrul — personal site
   Palette: Slate / Coral
   ========================================================================= */

:root {
  /* Light surfaces */
  --paper: #f4f5f7;
  --surface: #eceef1;
  --surface2: #e8eaee;
  --card: #ffffff;
  --ink: #202530;
  --muted: #58606e;
  --line: #e1e4e9;
  --card-line: #e7eaef;

  /* Coral accent */
  --accent: #e0604a;
  --accent-dark: #c04431;
  --accent-soft: #fbe6e1;
  --accent-softline: #f5d3cb;
  --on-accent: #ffffff;
  --mark: #ffd7c2;

  /* Dark (contact + footer) */
  --dark: #1c2029;
  --dark2: #14171e;
  --dark-line: #2e343f;
  --dark-text: #eef0f3;
  --dark-muted: #aab2be;
  --dark-input: #262b34;
  --dark-inputline: #3a414c;
  --dark-accent: #f08a72;

  /* Category accents */
  --c-ib: #b34a3a;      --c-ib-soft: #f6e2de;
  --c-apa: #3f7d54;     --c-apa-soft: #e0efe4;
  --c-app: #3a6ea5;     --c-app-soft: #dde8f2;
  --c-igcse: #7a5aa0;   --c-igcse-soft: #e8e1f0;
  --c-apc: #8c7cf0;     --c-apc-soft: #e9e7fb;

  --maxw: 1120px;
}

/* ---- Reset / base ------------------------------------------------------ */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Hanken Grotesk', system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
  overflow-x: hidden;
}

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

mark {
  background: var(--mark);
  color: inherit;
  padding: 0 .1em;
  border-radius: 3px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

img { display: block; max-width: 100%; }

.mono { font-family: 'JetBrains Mono', monospace; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---- Layout helpers ---------------------------------------------------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 76px 24px; }
.container--narrow { max-width: 840px; }

.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 76px 24px;
  scroll-margin-top: 80px;
}
/* Full-bleed background variants: the .section becomes the band, an inner
   .container re-centres the content. */
.section--surface,
.section--surface2,
.section--dark {
  max-width: none;
  margin: 0;
  padding: 0;
}
.section--surface { background: var(--surface); }
.section--surface2 { background: var(--surface2); }
.section--dark { background: var(--dark); color: var(--dark-text); }
.section--narrow { max-width: 840px; padding-top: 40px; }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}
.rule { flex: 1; height: 1px; background: var(--line); min-width: 40px; }

.label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--accent);
}
.label--accent { color: var(--dark-accent); }

.h2 {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
}
.section--dark .h2 { color: var(--dark-text); font-size: clamp(32px, 4.6vw, 52px); line-height: 1.03; }
.h2--flush { margin-top: 0; }

.lead {
  font-size: 18px;
  color: var(--muted);
  max-width: 60ch;
  margin: 14px 0 0;
}
.lead--dark { color: var(--dark-muted); }

/* ---- Buttons ----------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 999px;
  font-family: inherit;
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn--primary {
  background: var(--accent);
  color: var(--on-accent);
  box-shadow: 0 2px 0 var(--accent-dark);
}
.btn--primary:hover { color: var(--on-accent); }
.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn--ghost:hover { color: var(--ink); }
.btn--sm { padding: 9px 18px; font-size: 14.5px; box-shadow: 0 1px 0 var(--accent-dark); }

/* ---- Nav --------------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--ink);
  font-weight: 600;
  font-size: 17px;
}
.nav__brand:hover { color: var(--ink); }
.nav__brand-mark { color: var(--accent); font-weight: 500; }

.nav__menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}
.nav__link {
  padding: 7px 12px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14.5px;
}
.nav__link:hover { color: var(--ink); }
.nav__link--active {
  color: var(--ink);
  font-weight: 600;
  background: var(--accent-soft);
}
.nav__cta { margin-left: 6px; }

.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: 6px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
}
.lang-btn {
  border: none;
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  padding: 5px 9px;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
}
.lang-btn--active { background: var(--ink); color: var(--paper); }

/* Hamburger — hidden on desktop */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
  cursor: pointer;
}
.nav__toggle-bar {
  height: 2px;
  width: 100%;
  background: var(--ink);
  border-radius: 2px;
  transition: transform .2s, opacity .2s;
}
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Hero -------------------------------------------------------------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 150px 24px 40px;
  scroll-margin-top: 80px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--accent-dark);
  background: var(--accent-soft);
  border: 1px solid var(--accent-softline);
  padding: 6px 13px;
  border-radius: 999px;
}
.hero__title {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: clamp(38px, 6.2vw, 74px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin: 22px 0 0;
  max-width: 15ch;
}
.hero__text {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--muted);
  max-width: 60ch;
  margin: 22px 0 0;
  line-height: 1.55;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 36px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 16px;
  border-radius: 12px;
  background: var(--card);
  border: 1px solid var(--line);
  color: var(--ink);
  font-weight: 500;
  font-size: 14.5px;
}
.chip:hover { color: var(--ink); }
.chip__dot { width: 7px; height: 7px; border-radius: 2px; background: var(--accent); display: inline-block; }
.chip--primary {
  padding: 12px 20px;
  border-radius: 14px;
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
  font-size: 16px;
  box-shadow: 0 2px 0 var(--accent-dark);
}
.chip--primary:hover { color: var(--on-accent); }
.chip--primary .chip__dot { width: 8px; height: 8px; background: var(--on-accent); }

/* ---- Feature lists (shared) ------------------------------------------- */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 18px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.feature-list li {
  display: flex;
  gap: 10px;
  font-size: 15px;
  color: var(--ink);
}
.feature-list__mark { color: var(--accent); }
.feature-list--blue .feature-list__mark { color: var(--c-app); }
.feature-list--purple .feature-list__mark { color: var(--c-igcse); }
.feature-list--green .feature-list__mark { color: var(--c-apa); }
.feature-list--lg li { font-size: 16px; }
.feature-list--lg { gap: 11px; margin: 20px 0 0; }

/* ---- Tutoring: course cards ------------------------------------------- */
.courses {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(195px, 1fr));
  gap: 20px;
  margin-top: 32px;
}
@media (max-width: 539px) {
  .courses { grid-template-columns: 1fr; }
}
.course-card {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-top: 4px solid var(--c);
  border-radius: 16px;
  padding: 26px;
  display: flex;
  flex-direction: column;
}
.course-card--ib    { --c: var(--c-ib);    --c-soft: var(--c-ib-soft); }
.course-card--apa   { --c: var(--c-apa);   --c-soft: var(--c-apa-soft); }
.course-card--app   { --c: var(--c-app);   --c-soft: var(--c-app-soft); }
.course-card--igcse { --c: var(--c-igcse); --c-soft: var(--c-igcse-soft); }
.course-card--apc   { --c: #8c7cf0; --c-soft: #e9e7fb; border-top-color: #8c7cf0; }

.course-card__title {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: 22px;
}
.tag {
  align-self: flex-start;
  margin-top: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--c);
  background: var(--c-soft);
  padding: 4px 9px;
  border-radius: 6px;
}
.course-card__desc { color: var(--muted); font-size: 15px; margin: 14px 0 4px; }
.course-card .feature-list__mark { color: var(--c); }
.course-card .feature-list { margin: 10px 0 18px; }
.card-cta {
  margin-top: auto;
  align-self: flex-start;
  font-weight: 600;
  font-size: 15px;
  color: var(--c);
}
.card-cta:hover { color: var(--c); }

/* ---- Consulting cards -------------------------------------------------- */
.cards2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
  margin-top: 32px;
}
.card {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: 16px;
  padding: 28px;
}
.card__head { display: flex; align-items: center; gap: 11px; }
.card__title { font-family: 'Newsreader', serif; font-weight: 500; font-size: 23px; }
.card__desc { color: var(--muted); font-size: 15px; margin: 16px 0 4px; }
.icon-badge {
  width: 34px; height: 34px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 16px;
  flex-shrink: 0;
}
.icon-badge--blue { background: var(--c-app-soft); color: var(--c-app); }
.icon-badge--purple { background: var(--c-igcse-soft); color: var(--c-igcse); }
.icon-badge--green { background: var(--c-apa-soft); color: var(--c-apa); }
.who {
  border-top: 1px dashed var(--line);
  padding-top: 13px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--muted);
}

/* ---- Robotics ---------------------------------------------------------- */
.rob-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 34px;
  align-items: start;
  margin-top: 12px;
}
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.stat {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: 14px;
  padding: 22px;
}
.stat--wide { grid-column: 1 / -1; display: flex; align-items: baseline; gap: 12px; }
.stat__num { font-family: 'Newsreader', serif; font-size: 40px; color: var(--accent); line-height: 1; }
.stat__num--lg { font-size: 44px; }
.stat__label { font-size: 14px; color: var(--muted); margin-top: 4px; }
.stat--wide .stat__label { font-size: 15px; margin-top: 0; }

/* ---- About ------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 44px;
  align-items: center;
  margin-top: 14px;
}
.about__text { order: 2; }
.about__p { font-size: 17px; color: var(--muted); margin: 18px 0 0; line-height: 1.6; }
.about__p + .about__p { margin-top: 14px; }
.about__photo {
  order: 1;
  aspect-ratio: 4 / 5;
  max-width: 360px;
  width: 100%;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
}
.about__photo img { width: 100%; height: 100%; object-fit: cover; object-position: center 20%; }
.creds { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; }
.cred {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  padding: 7px 12px;
  border-radius: 8px;
}

/* ---- Reviews ----------------------------------------------------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin-top: 30px;
}
.review {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: 16px;
  padding: 24px;
}
.stars { color: var(--accent); font-size: 15px; letter-spacing: 2px; }
.review__q {
  margin: 12px 0 0;
  font-family: 'Newsreader', serif;
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink);
}
.review__a {
  margin-top: 14px;
  font-size: 13.5px;
  color: var(--muted);
  font-family: 'JetBrains Mono', monospace;
}

/* ---- FAQ --------------------------------------------------------------- */
.faq { display: flex; flex-direction: column; gap: 10px; margin-top: 26px; }
.faq-item {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: 12px;
  padding: 4px 20px;
}
.faq-item__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  padding: 16px 0;
  font-weight: 600;
  font-size: 17px;
  list-style: none;
}
.faq-item__q::-webkit-details-marker { display: none; }
.faq-item__plus { color: var(--accent); font-size: 22px; line-height: 1; transition: transform .2s; }
.faq-item[open] .faq-item__plus { transform: rotate(45deg); }
.faq-item__a { margin: 0 0 16px; color: var(--muted); font-size: 15.5px; line-height: 1.55; }

/* ---- Contact form ------------------------------------------------------ */
.form { margin-top: 30px; }
.form__group-label,
.field__label {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  color: var(--dark-muted);
}
.form__group-label { margin-bottom: 10px; }
.field__label { margin-bottom: 6px; }

.subject-pills { display: flex; flex-wrap: wrap; gap: 10px; }
.pill {
  cursor: pointer;
  font-family: inherit;
  font-size: 14.5px;
  font-weight: 500;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--dark-inputline);
  background: transparent;
  color: var(--dark-text);
}
.pill--active {
  font-weight: 600;
  border-color: var(--accent);
  background: var(--accent);
  color: var(--on-accent);
}

.form__row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 20px;
}
.field { margin-top: 14px; }
.form__row .field { margin-top: 0; }
.field__input {
  width: 100%;
  padding: 13px 14px;
  border-radius: 10px;
  border: 1px solid var(--dark-inputline);
  background: var(--dark-input);
  color: var(--dark-text);
  font-family: inherit;
  font-size: 15px;
}
textarea.field__input { resize: vertical; }
.field__input::placeholder { color: var(--dark-muted); }

.form__submit { margin-top: 18px; border: none; }
.form-note { margin: 14px 0 0; font-size: 14.5px; color: var(--dark-accent); }
.form-note:not(.is-visible) { display: none; }

/* ---- Footer ------------------------------------------------------------ */
.footer { background: var(--dark2); color: var(--dark-muted); }
.footer__top {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 44px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
}
.footer__brand {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--dark-text);
  font-weight: 600;
  font-size: 17px;
}
.footer__brand-mark { color: var(--dark-accent); }
.footer__tagline { font-size: 14px; color: var(--dark-muted); margin-top: 6px; }
.footer__desc { font-size: 13.5px; color: var(--dark-muted); margin-top: 6px; max-width: 44ch; line-height: 1.5; }
.footer__links { display: flex; flex-direction: column; gap: 4px; font-size: 14px; }
.footer__links a { color: var(--dark-accent); }
.footer__loc { color: var(--dark-muted); }
.footer__social {
  display: flex;
  gap: 16px;
  margin-bottom: 4px;
}
.footer__social-link {
  color: var(--dark-muted);
  transition: color 0.2s;
  display: flex;
  align-items: center;
}
.footer__social-link:hover { color: var(--dark-accent); }
.footer__legal-wrap { border-top: 1px solid var(--dark-line); }
.footer__legal {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 24px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--dark-muted);
}

/* ---- Responsive: mobile nav ------------------------------------------- */
@media (max-width: 820px) {
  .nav__toggle { display: flex; }
  .nav__menu {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px 24px 20px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 12px 24px rgba(0, 0, 0, .08);
    display: none;
  }
  .nav__menu.is-open { display: flex; }
  .nav__link { padding: 11px 12px; font-size: 16px; }
  .lang-switch { margin-left: 0; margin-top: 6px; align-self: flex-start; }
  .nav__cta { margin-left: 0; margin-top: 6px; align-self: flex-start; }
}

@media (max-width: 520px) {
  .stats { grid-template-columns: 1fr; }
  .about__photo { max-width: none; }
}

/* ---- Hero tags (small label pills below CTAs) -------------------------- */
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}
.hero-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--muted);
  background: var(--card);
  border: 1px solid var(--line);
  padding: 5px 10px;
  border-radius: 6px;
  transition: color .15s, border-color .15s;
}
.hero-tag:hover { color: var(--ink); border-color: var(--accent); }

/* ---- Services overview grid ------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 36px;
}
.srv-card {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: 16px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.srv-card__title {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: 20px;
  line-height: 1.15;
}
.srv-card__desc {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
  flex: 1;
}

/* ---- Course keyword pills ---------------------------------------------- */
.keywords {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 14px 0 20px;
}
.keyword {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--c);
  background: var(--c-soft);
  padding: 4px 9px;
  border-radius: 6px;
}

/* ---- Lessons bottom note ----------------------------------------------- */
.lessons-note {
  margin-top: 40px;
  padding: 22px 26px;
  border-left: 3px solid var(--accent);
  background: var(--card);
  border-radius: 0 12px 12px 0;
  border-top: 1px solid var(--card-line);
  border-right: 1px solid var(--card-line);
  border-bottom: 1px solid var(--card-line);
}
.lessons-note p {
  font-size: 15.5px;
  color: var(--ink);
  line-height: 1.8;
}

/* ---- AI consulting intro + service list -------------------------------- */
.ai-intro {
  max-width: 54ch;
  margin: 20px 0 36px;
}
.ai-intro p {
  font-size: 18px;
  color: var(--muted);
  line-height: 1.55;
}
.ai-intro p + p { margin-top: 6px; }

.ai-services-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
  list-style: none;
}
.ai-services-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: 10px;
}
.ai-services-list li::before {
  content: '→';
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  flex-shrink: 0;
}

/* ---- About closing line ------------------------------------------------ */
.about__closing {
  font-family: 'Newsreader', serif;
  font-style: italic;
  font-size: 19px;
  color: var(--ink);
  margin-top: 20px;
  padding-left: 18px;
  border-left: 2px solid var(--accent);
  line-height: 1.4;
}

/* ---- Hero title — wider max for two-sentence headline ------------------ */
.hero__title { max-width: 20ch; }

/* ---- Why Work With Me -------------------------------------------------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 36px;
}
.why-card {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: 16px;
  padding: 28px 30px;
}
.why-card__title {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: 21px;
  margin-bottom: 12px;
}
.why-card__body {
  font-size: 15.5px;
  color: var(--muted);
  line-height: 1.65;
}

/* ---- Professional Experience ------------------------------------------- */
.exp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 36px;
}
.exp-card {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: 16px;
  padding: 28px 30px;
}
.exp-card__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.exp-card__org {
  font-weight: 600;
  font-size: 17px;
  color: var(--ink);
  line-height: 1.3;
}
.exp-card__loc {
  font-size: 14px;
  color: var(--muted);
  margin-top: 4px;
}
.exp-card__period {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--accent);
  white-space: nowrap;
  flex-shrink: 0;
  padding-top: 3px;
}
.exp-roles {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.exp-role {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  color: var(--ink);
}
.exp-role::before {
  content: '▹';
  color: var(--accent);
  flex-shrink: 0;
  font-size: 12px;
}

/* ---- Conferences & Workshops ------------------------------------------- */
.conf-list {
  list-style: none;
  margin-top: 32px;
}
.conf-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.conf-item:first-child { border-top: 1px solid var(--line); }
.conf-item__name {
  font-weight: 500;
  font-size: 17px;
  color: var(--ink);
}
.conf-item__loc {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  color: var(--muted);
  flex-shrink: 0;
}

/* ---- Featured Work ----------------------------------------------------- */
.work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 32px;
}
.work-card {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: 16px;
  padding: 26px 28px 30px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.work-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.work-card__category {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--muted);
}
.work-card__title {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: 21px;
  line-height: 1.15;
  margin: 0;
}
.work-card__desc {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.6;
}
.work-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 4px 9px;
  border-radius: 6px;
  flex-shrink: 0;
  white-space: nowrap;
}
.work-badge--active   { background: var(--accent-soft);  color: var(--accent-dark); }
.work-badge--ongoing  { background: var(--c-app-soft);   color: var(--c-app); }
.work-badge--completed { background: var(--c-apa-soft);  color: var(--c-apa); }
.work-note {
  margin-top: 32px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}

/* ---- Robotics feature list spacing ------------------------------------- */
.rob-features { margin-top: 28px; max-width: none; }

/* ---- Robotics two-column split ----------------------------------------- */
.rob-split {
  display: grid;
  grid-template-columns: 55fr 45fr;
  gap: 52px;
  align-items: center;
}
@media (max-width: 860px) {
  .rob-split { grid-template-columns: 1fr; gap: 36px; }
}

/* ---- Carousel ---------------------------------------------------------- */
.rob-split__visual { width: 100%; }
.carousel {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 4px 24px rgba(0,0,0,0.07);
  background: var(--card);
  aspect-ratio: 4 / 3;
}
.carousel__track { position: relative; width: 100%; height: 100%; }
.carousel__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.5s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: #eef0f4;
}
.carousel__slide--active { opacity: 1; }
.carousel__slide img { width: 100%; height: 100%; object-fit: cover; }
.carousel__ph-icon { color: #b0b8c8; }
.carousel__ph-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: #b0b8c8;
}
.carousel__dots {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 2;
}
.carousel__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.55);
  cursor: pointer;
  padding: 0;
  transition: background 0.2s;
}
.carousel__dot--active,
.carousel__dot:hover { background: #fff; }
.carousel__btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  background: rgba(255,255,255,0.82);
  border: 1px solid var(--line);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  cursor: pointer;
  font-size: 22px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  color: var(--ink);
}
.carousel__btn:hover { background: #fff; }
.carousel__btn--prev { left: 12px; }
.carousel__btn--next { right: 12px; }

/* ---- Reduced motion ---------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

/* ---- Article / Blog pages ---------------------------------------------- */
.article-wrapper {
  padding-top: 76px; /* clear fixed nav */
}
.article-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 24px 88px;
}
.article-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--accent);
}
.article-h1 {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.1;
  margin: 16px 0 44px;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.article-body {
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink);
}
.article-body p { margin: 0 0 22px; }
.article-body strong { font-weight: 600; }
.article-body code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875em;
  background: var(--surface);
  border: 1px solid var(--card-line);
  border-radius: 4px;
  padding: 2px 6px;
}
.article-cta-band {
  background: var(--dark);
  padding: 64px 24px;
  text-align: center;
}
.article-cta-band__title {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.15;
  color: var(--dark-text);
  margin-bottom: 28px;
}
.article-cta-band__sub {
  font-size: 16px;
  color: var(--dark-muted);
  margin-bottom: 32px;
}

/* ---- Resources (blog cards on main pages) ------------------------------- */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 32px;
}
.resource-card {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: 16px;
  padding: 26px 28px 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.resource-card__tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--muted);
}
.resource-card__title {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: 19px;
  line-height: 1.2;
  margin: 0;
  color: var(--ink);
}
.resource-card__desc {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.6;
  flex: 1;
}
.resource-card__cta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  margin-top: 4px;
  align-self: flex-start;
}
.resource-card__cta:hover { color: var(--accent-dark); }

/* ---- YouTube promo section --------------------------------------------- */
.yt-promo {
  display: grid;
  grid-template-columns: 45fr 55fr;
  gap: 52px;
  align-items: center;
}
@media (max-width: 860px) {
  .yt-promo { grid-template-columns: 1fr; gap: 36px; }
}
.yt-promo__video { width: 100%; }
.yt-promo__body .label { display: block; margin-bottom: 16px; }
.yt-promo__body .h2 { margin-bottom: 20px; }
.yt-promo__body .lead { margin-bottom: 32px; }
.yt-embed-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--card-line);
  box-shadow: 0 4px 24px rgba(0,0,0,.07);
}
.yt-embed-wrap iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 16px;
}