/* ============================================================
   Mehmet Akif Sahin — stylesheet
   Theme colors live in the :root variables below — change them
   in one place to re-skin the whole site.
   ============================================================ */

:root {
  --bg: #ffffff;
  --surface: #f7f7f5;
  --text: #1a1a1a;
  --muted: #6b6b6b;
  --border: #e6e6e2;
  --accent: #3054d1;
  --accent-soft: rgba(48, 84, 209, 0.1);
  --max-width: 720px;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-head: Georgia, "Iowan Old Style", "Times New Roman", serif;
}

:root[data-theme="dark"] {
  --bg: #14151a;
  --surface: #1c1e26;
  --text: #e9e9ec;
  --muted: #9a9aa5;
  --border: #2a2c36;
  --accent: #7d9bff;
  --accent-soft: rgba(125, 155, 255, 0.14);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14151a;
    --surface: #1c1e26;
    --text: #e9e9ec;
    --muted: #9a9aa5;
    --border: #2a2c36;
    --accent: #7d9bff;
    --accent-soft: rgba(125, 155, 255, 0.14);
  }
}

* { box-sizing: border-box; }

/* Ensure the HTML `hidden` attribute always wins, even over display:grid etc. */
[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%; /* stop iOS from auto-inflating text */
  text-rendering: optimizeLegibility;
  overflow-x: hidden; /* safety net against accidental horizontal scroll */
  overflow-wrap: break-word; /* long URLs/words wrap instead of overflowing */
}

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

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

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

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav__brand {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
}

.nav__links {
  display: flex;
  gap: 20px;
  margin-left: auto;
}
.nav__links a {
  color: var(--muted);
  font-size: 0.95rem;
}
.nav__links a:hover { color: var(--text); text-decoration: none; }

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  width: 34px;
  height: 34px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  display: grid;
  place-items: center;
}
.theme-toggle:hover { border-color: var(--accent); }

/* ---------- Intro ---------- */
.intro {
  display: flex;
  gap: 32px;
  align-items: center;
  padding: 56px 0 32px;
}

.avatar {
  width: 184px;
  height: 184px;
  border-radius: 50%;
  flex-shrink: 0;
  object-fit: cover;
  object-position: 50% 20%; /* bias the crop toward the face for tall portraits */
  border: 1px solid var(--border);
}

.avatar--placeholder {
  display: grid;
  place-items: center;
  font-family: var(--font-head);
  font-size: 3.4rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  letter-spacing: 0.03em;
}

.intro__text { min-width: 0; }

.intro h1 {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 5.5vw, 2.3rem); /* scales smoothly across phone → desktop */
  line-height: 1.1;
  margin: 0 0 6px;
}

.intro__role { margin: 0; font-size: 1.05rem; }
.intro__affil { margin: 2px 0 14px; font-size: 0.98rem; }
.intro__blurb { margin: 0 0 18px; }

/* ---------- Link row ---------- */
.links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
}
.links a {
  font-size: 0.92rem;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.15s ease, color 0.15s ease;
}
.links a:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

/* ---------- Sections ---------- */
.section {
  padding: 34px 0;
  border-top: 1px solid var(--border);
}

.section h2 {
  font-family: var(--font-head);
  font-size: 1.4rem;
  margin: 0 0 16px;
}

.section__hint { margin-top: -6px; font-size: 0.95rem; }

.interests {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 20px;
}
.interests li {
  position: relative;
  padding-left: 20px;
}
.interests li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ---------- Experience / Education entries ---------- */
.entry {
  padding: 15px 0;
  border-bottom: 1px solid var(--border);
}
.entry:last-child { border-bottom: 0; }
.entry__head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 14px;
  align-items: baseline;
}
.entry__role { font-weight: 600; }
.entry__date {
  color: var(--muted);
  font-size: 0.88rem;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.entry__org {
  color: var(--accent);
  font-size: 0.95rem;
  margin: 2px 0 0;
}
.entry__desc { margin: 6px 0 0; font-size: 0.96rem; }

/* Job-progression timeline (multiple roles at one employer) */
.progression {
  list-style: none;
  margin: 12px 0 4px;
  padding: 0;
}
.progression li {
  position: relative;
  padding: 0 0 14px 22px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 2px 12px;
}
.progression li:last-child { padding-bottom: 0; }
.progression li::before {          /* connector line down to the previous role */
  content: "";
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: -2px;
  width: 2px;
  background: var(--border);
}
.progression li:last-child::before { display: none; }
.progression li::after {           /* node dot */
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-sizing: border-box;
}
.progression li:first-child::after { background: var(--accent); } /* current role filled */
/* Company name reads as a header above its role steps */
.entry--progression > .entry__head .entry__role {
  font-size: 1.25rem;
  font-weight: 700;
}
.progression__role { font-weight: 600; }
.progression__date {
  color: var(--muted);
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
}

/* ---------- Awards ---------- */
.awards { margin: 0; padding: 0 0 0 20px; }
.awards li { margin-bottom: 8px; }
.awards li:last-child { margin-bottom: 0; }

/* ---------- Publications ---------- */
.pubs { margin: 0; padding: 0; list-style: none; counter-reset: pub; }
.pub {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.pub:last-child { border-bottom: 0; }
.pub__title { margin: 0 0 3px; font-weight: 600; }
.pub__authors { margin: 0 0 2px; font-size: 0.95rem; }
.pub__venue { margin: 0 0 6px; font-size: 0.95rem; color: var(--muted); }
.pub__award {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 9px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #8a6a12;
  background: rgba(214, 173, 78, 0.18);
  border: 1px solid rgba(214, 173, 78, 0.5);
  border-radius: 999px;
  vertical-align: middle;
  white-space: nowrap;
}
:root[data-theme="dark"] .pub__award { color: #f0d287; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .pub__award { color: #f0d287; }
}
.pub__links { margin: 0; font-size: 0.88rem; }
.pub__links a { color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer {
  padding: 40px 24px 56px;
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
  margin-top: 20px;
}

/* ---------- Responsive ---------- */
@media (max-width: 560px) {
  body { font-size: 16px; }
  .container, .nav { padding-left: 18px; padding-right: 18px; }
  .nav__links { display: none; }
  .theme-toggle { margin-left: auto; } /* keep toggle at the right once links are hidden */
  .intro {
    flex-direction: column;
    text-align: center;
    gap: 18px;
    padding-top: 36px;
  }
  .links { justify-content: center; }
  .interests { grid-template-columns: 1fr; }
  .entry__head { gap: 2px 12px; }
}

/* ---------- Print (for "Save as PDF") ---------- */
@media print {
  .site-header, .theme-toggle, .site-footer { display: none; }
  body { font-size: 12px; color: #000; background: #fff; }
  a { color: #000; text-decoration: underline; }
}