/* ===== Renkler ve yazı tipleri ===== */
:root {
  --ink: #16243A;          /* lacivert: başlıklar, koyu bölüm */
  --text: #2B3442;         /* gövde metni */
  --muted: #5E6878;        /* ikincil metin */
  --paper: #FFFFFF;        /* zemin */
  --tint: #F2F4F7;         /* açık gri bölüm zemini */
  --rule: #D8DDE4;         /* çizgiler */
  --accent: #7A1F3D;       /* bordo vurgu (eski sitenin rengiyle süreklilik) */
  --accent-soft: #F6E9EE;
  --on-dark: #E9EDF3;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --wrap: 72rem;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #E6EAF0; --text: #CDD3DC; --muted: #98A2B1;
    --paper: #12161D; --tint: #181E27; --rule: #2C3440;
    --accent: #E08AA6; --accent-soft: #2A1C23; --on-dark: #E6EAF0;
    color-scheme: dark;
  }
}

/* ===== Dil seçimi ===== */
html[data-lang="tr"] [data-l="en"],
html[data-lang="en"] [data-l="tr"] { display: none !important; }

/* ===== Temel ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--paper); color: var(--text);
  font: 400 1.0625rem/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
h1, h2, h3 { color: var(--ink); font-family: var(--serif); font-weight: 600; line-height: 1.2; margin: 0; }
h3 { font-size: 1.2rem; margin: 2rem 0 0.6rem; }
p { margin: 0 0 1rem; max-width: 68ch; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 1.5rem; }
.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--paper); padding: .6rem 1rem; z-index: 100; }
.skip:focus { left: 1rem; top: 1rem; }

/* ===== Üst bar ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 4rem; gap: 1rem; }
.brand { font-family: var(--serif); font-size: 1.25rem; font-weight: 600; color: var(--ink); text-decoration: none; }
.nav { display: flex; align-items: center; gap: 1.4rem; }
.nav a { color: var(--text); text-decoration: none; font-size: 0.95rem; }
.nav a:hover { color: var(--accent); }
.lang { display: inline-flex; border: 1px solid var(--rule); border-radius: 6px; overflow: hidden; margin-left: .4rem; }
.lang button {
  font: 500 0.8rem var(--sans); padding: .35rem .6rem; border: 0; background: transparent; color: var(--muted); cursor: pointer;
}
.lang button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.nav-toggle {
  display: none; font: 500 .95rem var(--sans); background: none; border: 1px solid var(--rule);
  border-radius: 6px; padding: .4rem .8rem; color: var(--ink); cursor: pointer;
}
@media (max-width: 960px) {
  .nav-toggle { display: inline-block; }
  .nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--paper); border-bottom: 1px solid var(--rule); padding: .5rem 1.5rem 1.2rem;
  }
  .nav.open { display: flex; }
  .nav a { padding: .65rem 0; width: 100%; border-bottom: 1px solid var(--rule); }
  .lang { margin: 1rem 0 0; }
}

/* ===== Giriş ===== */
.hero { padding: 5rem 0 4.5rem; border-bottom: 1px solid var(--rule); }
.hero-grid { display: grid; grid-template-columns: 1fr 21rem; gap: 4rem; align-items: center; }
.hero-title { font-size: 1.05rem; color: var(--muted); margin: 0 0 .4rem; letter-spacing: .01em; }
.hero h1 { font-size: clamp(2.8rem, 6.5vw, 4.75rem); font-weight: 400; letter-spacing: -0.015em; margin-bottom: 1.2rem; }
.hero-affil { font-size: 1.1rem; color: var(--ink); line-height: 1.5; margin-bottom: 1.8rem; padding-left: 1rem; border-left: 3px solid var(--accent); }
.hero-lede { font-family: var(--serif); font-size: 1.2rem; line-height: 1.7; max-width: 58ch; }
.hero-links { list-style: none; padding: 0; margin: 1.8rem 0 0; display: flex; flex-wrap: wrap; gap: .4rem 1.6rem; font-size: .97rem; }
.portrait {
  margin: 0; position: relative; aspect-ratio: 1 / 1; background: var(--tint);
  border-radius: 4px; overflow: hidden;
}
.portrait img { width: 100%; height: 100%; object-fit: cover; }
.portrait .monogram { display: none; }
.portrait.no-photo { display: grid; place-items: center; background: var(--ink); }
.portrait.no-photo .monogram { display: block; font: 400 5rem var(--serif); color: var(--paper); letter-spacing: .04em; }
@media (prefers-color-scheme: dark) { .portrait.no-photo { background: #22324A; } .portrait.no-photo .monogram { color: #E6EAF0; } }
@media (max-width: 820px) {
  .hero { padding: 3rem 0; }
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .portrait { max-width: 9.5rem; order: -1; }
  .portrait.no-photo .monogram { font-size: 3.2rem; }
}

/* ===== Bölümler ===== */
.block { padding: 4.5rem 0; }
.block-tint { background: var(--tint); }
.block-grid { display: grid; grid-template-columns: 15rem 1fr; gap: 3rem; }
.block-grid > h2 { font-size: 1.75rem; font-weight: 400; position: sticky; top: 6rem; align-self: start; }
.block-body > h3:first-child, .two-col h3:first-child { margin-top: 0; }
@media (max-width: 820px) {
  .block { padding: 3rem 0; }
  .block-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .block-grid > h2 { position: static; }
}
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; margin-top: 1.5rem; }
.block-body.two-col { margin-top: 0; }
@media (max-width: 640px) { .two-col { grid-template-columns: 1fr; gap: 1rem; } }
.plain { list-style: none; padding: 0; margin: 0; }
.plain li { padding: .45rem 0; border-bottom: 1px solid var(--rule); }
.plain li:last-child { border-bottom: 0; }
.note { color: var(--muted); font-size: .95rem; margin-top: 1.5rem; }
.meta { color: var(--muted); font-size: .92rem; }

/* Eğitim zaman çizelgesi */
.timeline { list-style: none; margin: 0; padding: 0 0 0 1.25rem; border-left: 2px solid var(--rule); }
.timeline li { position: relative; padding: 0 0 1.1rem; display: grid; grid-template-columns: 7.5rem 1fr; gap: 1rem; }
.timeline li::before {
  content: ""; position: absolute; left: calc(-1.25rem - 6px); top: .5rem;
  width: 10px; height: 10px; border-radius: 50%; background: var(--paper); border: 2px solid var(--accent);
}
.tl-degree { font-weight: 600; color: var(--ink); }
@media (max-width: 640px) { .timeline li { grid-template-columns: 1fr; gap: 0; } }

/* Duyurular */
.news { list-style: none; padding: 0; margin: 0; }
.news li { display: grid; grid-template-columns: 8rem 1fr; gap: 1.5rem; padding: 1.1rem 0; border-bottom: 1px solid var(--rule); }
.news li:first-child { padding-top: 0; }
.news time { color: var(--muted); font-size: .92rem; padding-top: .15rem; }
.news h3 { margin: 0 0 .3rem; font-size: 1.1rem; }
.news p { margin: 0; }
@media (max-width: 640px) { .news li { grid-template-columns: 1fr; gap: .2rem; } }

/* Yayınlar */
.pub-group h3 { margin-top: 0; }
.pub-group + .pub-group { margin-top: 2.25rem; }
.pubs { list-style: none; padding: 0; margin: 0; }
.pubs li { padding: .9rem 0; border-bottom: 1px solid var(--rule); max-width: 72ch; }
.pubs .p-title { font-family: var(--serif); font-size: 1.1rem; color: var(--ink); }
.pubs .p-cite { display: block; color: var(--muted); font-size: .93rem; margin-top: .2rem; }

/* Dersler */
.course-group + .course-group { margin-top: 2.25rem; }
.course-group > h3 { margin: 0 0 .6rem; }
details.course { background: var(--paper); border: 1px solid var(--rule); border-radius: 6px; margin-bottom: .5rem; }
details.course[open] { border-color: var(--ink); }
details.course summary {
  cursor: pointer; list-style: none; padding: .85rem 1rem; display: flex; justify-content: space-between; gap: 1rem; align-items: baseline;
  color: var(--ink); font-weight: 500;
}
details.course summary::-webkit-details-marker { display: none; }
details.course summary::after { content: "+"; font: 400 1.3rem var(--sans); color: var(--muted); line-height: 1; }
details.course[open] summary::after { content: "−"; }
.course-count { margin-left: auto; color: var(--muted); font-size: .88rem; font-weight: 400; white-space: nowrap; }
.course-body { padding: 0 1rem 1rem; }
.course-body p { font-size: .97rem; }
.files { list-style: none; padding: 0; margin: 0; }
.files li { border-top: 1px solid var(--rule); }
.files a { display: flex; gap: 1rem; justify-content: space-between; padding: .6rem 0; text-decoration: none; color: var(--text); }
.files a:hover .f-name { color: var(--accent); text-decoration: underline; }
.files .f-type { color: var(--muted); font-size: .85rem; white-space: nowrap; }
.empty { color: var(--muted); font-size: .95rem; margin: 0; }

/* Etiketler ve düğmeler */
.tags { list-style: none; padding: 0; margin: 0 0 1.5rem; display: flex; flex-wrap: wrap; gap: .5rem; }
.tags li { background: var(--accent-soft); color: var(--ink); padding: .35rem .8rem; border-radius: 999px; font-size: .93rem; }
.button {
  display: inline-block; background: var(--ink); color: var(--paper); text-decoration: none;
  padding: .7rem 1.2rem; border-radius: 6px; font-weight: 500; font-size: .97rem;
}
.button:hover { background: var(--accent); color: #fff; }
.entry h3 { margin-top: 0; }

/* Koyu iletişim bölümü */
.block-dark { background: #16243A; color: #E9EDF3; }
.block-dark h2, .block-dark h3 { color: #FFFFFF; }
.block-dark h3 { font-family: var(--sans); font-size: .9rem; font-weight: 500; color: #A9B4C4; margin: 0 0 .3rem; }
.block-dark p { margin-bottom: 1.5rem; }
.block-dark a { color: #FFFFFF; }
.block-dark :focus-visible { outline-color: #fff; }
@media (prefers-color-scheme: dark) { .block-dark { background: #0C1017; border-top: 1px solid var(--rule); } }

/* Alt bilgi */
.site-footer { padding: 1.5rem 0; font-size: .88rem; color: var(--muted); border-top: 1px solid var(--rule); }
.site-footer p { margin: 0; max-width: none; }

@media print {
  .site-header, .lang, .button, .skip { display: none !important; }
  details.course { break-inside: avoid; }
}

/* Galeri */
.gal-group + .gal-group { margin-top: 2.75rem; }
.gal-group > h3 { margin: 0 0 1rem; }
.photos { display: grid; grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr)); gap: 1rem; }
.photos figure { margin: 0; }
.photos a { display: block; aspect-ratio: 4 / 3; overflow: hidden; border-radius: 4px; background: var(--rule); }
.photos img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s; }
.photos a:hover img { transform: scale(1.03); }
.photos figcaption { font-size: .9rem; color: var(--muted); margin-top: .45rem; line-height: 1.45; }
.videos { display: grid; grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr)); gap: 1.25rem; }
.videos.wide { grid-template-columns: repeat(auto-fill, minmax(24rem, 1fr)); }
@media (max-width: 640px) { .videos, .videos.wide { grid-template-columns: 1fr; } }
.videos figure { margin: 0; }
.vframe { position: relative; aspect-ratio: 16 / 9; background: #000; border-radius: 4px; overflow: hidden; }
.vframe iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.videos figcaption { font-size: .93rem; color: var(--text); margin-top: .5rem; }