/* =========================================================
   Liel Mazar — portfolio
   Plain CSS. Mobile-first. Light/dark via prefers-color-scheme,
   with a manual [data-theme] override set by a small JS toggle.
   ========================================================= */

/* ---- Design tokens ---- */
:root {
  --maxw: 64rem;
  --pad: 1.25rem;
  --radius: 14px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  /* Light theme (default) */
  --bg: #f8fafc;
  --bg-alt: #eef2f7;
  --surface: #ffffff;
  --border: #d9e0ea;
  --text: #16202e;
  --text-soft: #51607a;
  --accent: #1f5fa8;
  --accent-contrast: #ffffff;
  --shadow: 0 1px 2px rgba(16, 32, 54, .06), 0 8px 24px rgba(16, 32, 54, .06);
}

/* Manual dark override */
:root[data-theme="dark"] {
  --bg: #0f172a;
  --bg-alt: #131f38;
  --surface: #182441;
  --border: #2a3a5e;
  --text: #e8eef7;
  --text-soft: #9fb0cc;
  --accent: #7cb2ef;
  --accent-contrast: #0f172a;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px rgba(0, 0, 0, .35);
}

/* If JS never runs, still honor system dark mode */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #0f172a;
    --bg-alt: #131f38;
    --surface: #182441;
    --border: #2a3a5e;
    --text: #e8eef7;
    --text-soft: #9fb0cc;
    --accent: #7cb2ef;
    --accent-contrast: #0f172a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px rgba(0, 0, 0, .35);
  }
}

/* ---- Reset-ish ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---- Skip link ---- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: .6rem 1rem;
  z-index: 100;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; text-decoration: none; }

/* ---- Monogram ---- */
.monogram {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 700;
  letter-spacing: .02em;
  font-size: .85rem;
}
.monogram--lg {
  width: 6.5rem;
  height: 6.5rem;
  font-size: 2.4rem;
  box-shadow: var(--shadow);
}

/* ---- Header / nav ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: .6rem var(--pad);
  display: flex;
  align-items: center;
  gap: 1rem;
}
.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  color: var(--text);
  font-weight: 700;
}
.nav__brand:hover { text-decoration: none; }
.nav__name { font-size: 1rem; }
.nav__links {
  display: none;
  list-style: none;
  margin: 0 0 0 auto;
  padding: 0;
  gap: 1.25rem;
}
.nav__links a { color: var(--text-soft); font-size: .95rem; }
.nav__links a:hover { color: var(--text); text-decoration: none; }

.theme-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
}
.theme-toggle:hover { border-color: var(--accent); }

@media (min-width: 720px) {
  .nav__links { display: flex; }
  .theme-toggle { margin-left: 0; }
}

/* ---- Layout helpers ---- */
.section { padding: 3.5rem 0; }
.section--alt { background: var(--bg-alt); }
.section__inner,
.hero__inner,
.site-footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
}
.section__title {
  font-size: 1.5rem;
  margin: 0 0 1.5rem;
  letter-spacing: -.01em;
}
.prose p { color: var(--text); max-width: 60ch; margin: 0; }

/* ---- Hero ---- */
.hero {
  padding: 4.5rem 0 3.5rem;
  text-align: center;
}
.hero__avatar { display: flex; justify-content: center; margin-bottom: 1.5rem; }
.hero__name {
  font-size: clamp(2rem, 6vw, 3rem);
  margin: 0 0 .5rem;
  letter-spacing: -.02em;
}
.hero__tagline {
  font-size: clamp(1.05rem, 3vw, 1.3rem);
  font-weight: 600;
  color: var(--text);
  margin: 0 auto .9rem;
  max-width: 40ch;
}
.hero__subline {
  color: var(--text-soft);
  max-width: 52ch;
  margin: 0 auto 1.8rem;
}
.hero__actions {
  display: flex;
  gap: .75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---- Buttons ---- */
.btn {
  display: inline-block;
  padding: .7rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid transparent;
  transition: transform .05s ease, background-color .15s ease, border-color .15s ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--accent); color: var(--accent-contrast); }
.btn--primary:hover { background: color-mix(in srgb, var(--accent) 88%, #000); }
.btn--ghost { border-color: var(--border); color: var(--text); background: var(--surface); }
.btn--ghost:hover { border-color: var(--accent); }

/* ---- Cards (focus areas) ---- */
.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.3rem;
  box-shadow: var(--shadow);
}
.card__title { font-size: 1.05rem; margin: 0 0 .4rem; }
.card__text { color: var(--text-soft); margin: 0; font-size: .95rem; }

@media (min-width: 640px) { .cards { grid-template-columns: 1fr 1fr; } }
@media (min-width: 960px) { .cards { grid-template-columns: 1fr 1fr 1fr; } }

/* ---- Projects ---- */
.projects { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; }
.project {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--shadow);
}
.project__title { font-size: 1.1rem; margin: 0 0 .5rem; }
.project__text { color: var(--text-soft); margin: 0 0 .6rem; }
.project__meta {
  margin: 0;
  font-size: .8rem;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.project__link { font-weight: 600; font-size: .92rem; }
@media (min-width: 760px) { .projects { grid-template-columns: 1fr 1fr; } }

/* ---- Publications ---- */
.pubs { margin: 0; padding-left: 1.1rem; display: grid; gap: .8rem; }
.pubs .pub { color: var(--text); max-width: 70ch; }

/* ---- Contact ---- */
.contact { list-style: none; margin: 0; padding: 0; display: grid; gap: .8rem; }
.contact__item { display: flex; gap: .75rem; align-items: baseline; }
.contact__label {
  min-width: 5.5rem;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-soft);
}

/* ---- Footer ---- */
.site-footer { border-top: 1px solid var(--border); padding: 2rem 0; }
.site-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: .5rem;
  color: var(--text-soft);
  font-size: .9rem;
}
.site-footer__inner p { margin: 0; }