/* ==========================================================================
   Doç. Dr. Mustafa Bulut — kişisel akademik site
   Tasarım sistemi v2 · Modern minimal (Swiss) · nötr & sofistike
   ========================================================================== */

:root {
  --bg: #f3f2ef;
  --surface: #ffffff;
  --ink: #131312;
  --ink-2: #55534e;
  --ink-3: #6c6a63;
  --line: #dedcd6;
  --line-2: #c8c6bf;
  --accent: #2540d8;
  --accent-ink: #1a2f9e;

  --font-display: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --maxw: 1240px;
  --measure: 66ch;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--ink);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
}

p { margin: 0 0 1.1em; }

::selection { background: var(--accent); color: #fff; }

.eyebrow {
  font-family: var(--font-sans);
  text-transform: uppercase;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--ink-3);
}

.dot { color: var(--accent); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(20px, 5vw, 56px); }

/* --------------------------------- Header -------------------------------- */

.site-header {
  position: -webkit-sticky; /* eski iOS Safari */
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg); /* katı fallback: color-mix/backdrop-filter desteklemeyen tarayıcılar */
  border-bottom: 1px solid var(--line);
}
@supports ((-webkit-backdrop-filter: blur(8px)) or (backdrop-filter: blur(8px))) {
  .site-header {
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    -webkit-backdrop-filter: saturate(150%) blur(8px);
    backdrop-filter: saturate(150%) blur(8px);
  }
}

.nav-bar {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  padding: 0 clamp(20px, 5vw, 56px);
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.nav-brand:hover { color: var(--ink); }

.nav-toggle {
  display: none;
  background: none; border: none;
  color: var(--ink); cursor: pointer; padding: 8px; margin-right: -8px;
}
.nav-toggle svg { width: 24px; height: 24px; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-menu > li { position: relative; }
.has-dropdown > .nav-link { position: relative; }

.nav-menu a,
.nav-menu button.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-sans);
  font-size: 0.74rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-2);
  background: none; border: none; cursor: pointer;
  padding: 9px 11px;
  border-radius: 4px;
  white-space: nowrap;
}
.nav-menu a:hover,
.nav-menu button.nav-link:hover,
.nav-menu li.active > a { color: var(--ink); }
.nav-menu .chev { width: 11px; height: 11px; opacity: 0.6; transition: transform 0.18s; }
.has-dropdown:hover .chev { transform: rotate(180deg); }

.dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px;
  min-width: 236px;
  box-shadow: 0 12px 34px rgba(19,19,18,0.10);
}
.has-dropdown.open .dropdown { display: block; }

/* Desktop only: open on hover/focus. On touch devices only .open (JS toggle)
   controls the dropdown, so a second tap collapses it (hover/focus would stick). */
@media (min-width: 941px) {
  /* invisible bridge so the cursor never crosses a dead zone into the menu */
  .has-dropdown > .nav-link::after {
    content: "";
    position: absolute;
    left: 0; right: 0; top: 100%;
    height: 10px;
  }
  .has-dropdown:hover .dropdown,
  .has-dropdown:focus-within .dropdown { display: block; }
}
.dropdown a {
  display: block;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink-2);
  padding: 8px 11px;
  border-radius: 5px;
}
.dropdown a:hover { background: var(--bg); color: var(--ink); }

@media (max-width: 940px) {
  .nav-toggle { display: inline-flex; }
  .nav-menu {
    display: none;
    position: absolute;
    top: 70px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 12px clamp(20px, 5vw, 56px) 22px;
    max-height: calc(100vh - 70px);
    overflow-y: auto;
  }
  .nav-menu.open { display: flex; }
  .nav-menu a, .nav-menu button.nav-link {
    width: 100%; justify-content: space-between;
    padding: 13px 2px; font-size: 0.85rem;
    border-bottom: 1px solid var(--line);
  }
  .dropdown {
    position: static; display: none;
    border: none; box-shadow: none; padding: 0 0 8px 2px;
    min-width: 0; background: none;
  }
  .has-dropdown.open .dropdown { display: block; }
  .dropdown a { border: none; padding: 9px 2px; }
}

/* ---------------------------------- Hero --------------------------------- */

.hero {
  display: grid;
  grid-template-columns: 1fr minmax(240px, 420px);
  gap: clamp(32px, 6vw, 80px);
  align-items: center;
  padding: clamp(52px, 9vw, 116px) 0 clamp(44px, 7vw, 92px);
}
.hero-eyebrow { margin-bottom: 26px; }
.hero-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.6rem, 6.5vw, 4.6rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
  margin: 0 0 0.5em;
}
.hero-lede {
  font-size: clamp(1.08rem, 2.1vw, 1.4rem);
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 36ch;
  margin: 0;
}
.hero-links { display: flex; flex-wrap: wrap; gap: 12px 28px; }
.hero-links a {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--ink);
  padding-bottom: 4px;
  border-bottom: 1.5px solid var(--ink);
}
.hero-links a span { transition: transform 0.2s; color: var(--accent); }
.hero-links a:hover { border-color: var(--accent); }
.hero-links a:hover span { transform: translateX(4px); }

.hero-photo {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; gap: 34px; padding-top: clamp(40px, 8vw, 72px); }
  .hero-media { max-width: 220px; }
}

/* ------------------------------ Section rules ---------------------------- */

.band { border-top: 1px solid var(--line); padding: clamp(40px, 6vw, 68px) 0; }
.band-strong { border-top: 1.5px solid var(--ink); }

.band-label { display: block; margin-bottom: 26px; }

/* Focus areas */
.focus-list {
  list-style: none; margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px 32px;
}
.focus-list li {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.1rem, 1.9vw, 1.4rem);
  letter-spacing: -0.02em;
  color: var(--ink);
  display: flex; align-items: baseline; gap: 10px;
}
.focus-list .num {
  font-size: 0.72rem; font-weight: 600; color: var(--accent);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}
@media (max-width: 640px) {
  .focus-list { grid-template-columns: repeat(2, 1fr); gap: 18px 20px; }
}

/* Short intro */
.intro { max-width: var(--measure); }
.intro p { font-size: 1.16rem; color: var(--ink-2); margin: 0; }
.intro a {
  color: var(--ink); font-weight: 500;
  border-bottom: 1.5px solid var(--accent);
  padding-bottom: 1px;
}
.intro a:hover { color: var(--accent-ink); }

/* --------------------------------- Directory ----------------------------- */

.directory { border-top: 1.5px solid var(--ink); margin-top: clamp(40px, 6vw, 68px); }
.dir-row {
  display: grid;
  grid-template-columns: 52px 1fr auto;
  align-items: center;
  gap: 20px;
  padding: clamp(22px, 3.4vw, 34px) 6px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
}
.dir-num {
  font-family: var(--font-display); font-weight: 500;
  font-size: 0.85rem; color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}
.dir-main { min-width: 0; }
.dir-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  letter-spacing: -0.025em;
  line-height: 1.1;
  display: inline-block;
  transition: transform 0.22s ease;
}
.dir-desc { display: block; color: var(--ink-2); font-size: 0.94rem; margin-top: 6px; }
.dir-arrow {
  font-size: 1.4rem; color: var(--ink-3);
  transition: transform 0.22s ease, color 0.22s ease;
}
.dir-row:hover { color: var(--ink); }
.dir-row:hover .dir-title { transform: translateX(8px); }
.dir-row:hover .dir-arrow { transform: translateX(6px); color: var(--accent); }

@media (max-width: 560px) {
  .dir-row { grid-template-columns: 34px 1fr auto; gap: 14px; }
  .dir-desc { display: none; }
}

/* ------------------------------- Inner pages ----------------------------- */

.page-wrap { padding: 0 clamp(20px, 5vw, 56px) clamp(64px, 10vw, 120px); }
.content-narrow { max-width: 860px; margin: 0 auto; }

.page-head {
  padding: clamp(40px, 7vw, 84px) 0 18px;
  border-bottom: 1px solid var(--ink);
  margin-bottom: clamp(22px, 3.5vw, 36px);
}
.page-title {
  font-size: clamp(1.9rem, 3.6vw, 2.6rem);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin: 0;
}
.page-subtitle {
  font-family: var(--font-sans);
  color: var(--ink-3);
  font-size: 0.95rem;
  margin-top: 14px;
}

/* Legacy content-card wrapper → borderless typographic document */
.content-card { background: none; border: none; box-shadow: none; padding: 0; margin: 0 0 44px; }
.content-card > h4:first-child,
.content-card > h3:first-child {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin: 0;
  padding-top: clamp(36px, 6vw, 72px);
}
.content-card .w3-clear,
.content-card hr {
  border: none;
  border-top: 1px solid var(--ink);
  margin: 22px 0 34px;
}
.content-card p { text-align: left; }
.content-card b, .content-card strong { font-weight: 600; color: var(--ink); }

/* Plain prose (hakkında, sepader, editörlük) */
.content-card:not(.pub-list):not(.essay-page) p { color: var(--ink-2); max-width: var(--measure); }

/* --------------------------- Publication lists --------------------------- */

.pub-list p {
  margin: 0;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-2);
  font-size: 1rem;
}
.pub-list p:last-child { border-bottom: none; }
.pub-list p b, .pub-list p strong { color: var(--ink); }
.pub-list br { display: none; }

.pub-list h5 {
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--accent);
  margin: 40px 0 6px;
  padding-top: 8px;
  border-top: 1px solid var(--line-2);
}
.pub-list h5:first-of-type { margin-top: 4px; padding-top: 0; border-top: none; }

/* Sub-section headings within a combined page (e.g. Kitaplar) */
.pub-list .subsection {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 56px 0 10px;
  padding-top: 30px;
  border-top: 1.5px solid var(--ink);
  scroll-margin-top: 90px;
}
.pub-list .subsection + h5 { border-top: none; padding-top: 0; margin-top: 12px; }

/* --------------------------------- Table --------------------------------- */

.course-table { width: 100%; border-collapse: collapse; font-size: 0.98rem; }
.course-table th, .course-table td { text-align: left; padding: 15px 16px 15px 0; border-bottom: 1px solid var(--line); }
.course-table th {
  font-family: var(--font-sans);
  text-transform: uppercase; letter-spacing: 0.1em;
  font-size: 0.7rem; font-weight: 700; color: var(--ink-3);
  border-bottom: 1.5px solid var(--ink);
}
.course-table td { color: var(--ink-2); }
.course-table td:first-child { color: var(--ink); font-weight: 500; }

/* -------------------------------- Gallery -------------------------------- */

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: clamp(20px, 3vw, 36px);
}
.gallery-item { margin: 0; }
.gallery-item img {
  width: 100%; aspect-ratio: 4 / 3; object-fit: cover;
  background: var(--line);
  cursor: zoom-in;
}
.gallery-caption {
  margin-top: 12px;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--ink-2);
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: clamp(16px, 4vw, 40px);
  background: rgba(19, 19, 18, 0.94);
}
.lightbox.open { display: flex; }
.lightbox-inner {
  margin: 0;
  max-width: min(1120px, 94vw);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.lightbox-inner img {
  max-width: 100%;
  max-height: 82vh;
  width: auto;
  object-fit: contain;
}
.lightbox-inner figcaption {
  margin-top: 16px;
  max-width: 60ch;
  color: #e7e5df;
  font-size: 0.9rem;
  line-height: 1.5;
  text-align: center;
}
.lightbox-close {
  position: absolute;
  top: clamp(12px, 2vw, 22px);
  right: clamp(14px, 2.5vw, 26px);
  background: none;
  border: none;
  color: #fff;
  font-size: 2.4rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px 10px;
}
.lightbox-close:hover { color: #cbd5e1; }

/* --------------------------------- Essays -------------------------------- */

.essay-page p { max-width: var(--measure); color: var(--ink); }
.essay-page > .content-card,
.essay-page { }
.essay-divider {
  border: none;
  text-align: left;
  color: var(--line-2);
  font-size: 1.2rem;
  letter-spacing: 0.5em;
  margin: 40px 0;
}
.essay-byline {
  font-weight: 600;
  color: var(--ink) !important;
  font-size: 0.9rem;
  margin-top: 4px !important;
}
.essay-page b:first-child, .essay-page p > b:only-child {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

/* -------------------------------- Contact -------------------------------- */

.contact-block {
  display: inline-flex; align-items: center; gap: 14px;
  font-size: 1.3rem; font-family: var(--font-display); letter-spacing: -0.02em;
}
.contact-block svg { width: 24px; height: 24px; color: var(--accent); flex-shrink: 0; }
.contact-block a { color: var(--ink); border-bottom: 2px solid var(--accent); padding-bottom: 2px; }
.contact-block a:hover { color: var(--accent-ink); }

/* -------------------------------- Footer --------------------------------- */

.site-footer { border-top: 1.5px solid var(--ink); margin-top: clamp(48px, 8vw, 96px); }
.footer-inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(40px, 6vw, 68px) clamp(20px, 5vw, 56px) clamp(32px, 4vw, 44px);
}
.footer-top {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline;
  gap: 16px 40px;
  margin-bottom: 40px;
}
.footer-name {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(1.4rem, 3vw, 1.9rem); letter-spacing: -0.025em;
}
.footer-email {
  font-size: 0.95rem; font-weight: 500; color: var(--ink);
  border-bottom: 1.5px solid var(--accent); padding-bottom: 2px;
}
.footer-affil {
  display: flex; flex-wrap: wrap; gap: 10px 26px;
  padding-top: 26px; border-top: 1px solid var(--line);
}
.footer-affil a {
  font-family: var(--font-sans);
  text-transform: uppercase; letter-spacing: 0.12em;
  font-size: 0.72rem; font-weight: 600; color: var(--ink-3);
}
.footer-affil a:hover { color: var(--ink); }
.footer-bottom {
  margin-top: 30px;
  font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-3);
}

/* --------------------------------- Utils --------------------------------- */

.w3-small { font-size: 0.86rem; }
.w3-text-theme { color: var(--ink); }

/* -------------------------- Motion preferences --------------------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
}