/* =========================================================
   COB — Kişisel Site / Ortak Stiller
   Modern, koyu, teknolojik tema
   ========================================================= */

:root {
  /* Renkler */
  --bg:        #0c0f17;
  --bg-soft:   #121726;
  --surface:   #161c2e;
  --surface-2: #1d2540;
  --border:    #283153;
  --text:      #e7ecf5;
  --text-dim:  #9aa6c4;
  --text-mute: #6b7693;

  --accent:    #6c8cff;
  --accent-2:  #38e1c4;
  --accent-3:  #ff6b9d;
  --glow:      rgba(108, 140, 255, 0.35);

  /* Tipografi */
  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;

  /* Ölçüler */
  --maxw: 1120px;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  --trans: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Arka plan dekoru */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(600px circle at 15% 0%, rgba(108, 140, 255, 0.12), transparent 45%),
    radial-gradient(700px circle at 85% 10%, rgba(56, 225, 196, 0.08), transparent 45%);
}

a { color: inherit; text-decoration: none; }

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

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 22px;
}

/* ---------- Navbar ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(12, 15, 23, 0.72);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 9px;
}
.brand__dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 14px var(--glow);
}
.nav__links {
  display: flex;
  gap: 4px;
  list-style: none;
  align-items: center;
}
.nav__links a {
  padding: 8px 13px;
  border-radius: 9px;
  font-size: 0.92rem;
  color: var(--text-dim);
  transition: var(--trans);
  font-weight: 500;
}
.nav__links a:hover { color: var(--text); background: var(--surface); }
.nav__links a.active { color: var(--text); background: var(--surface-2); }

.nav__toggle {
  display: none;
  background: none; border: none; cursor: pointer;
  color: var(--text); font-size: 1.5rem;
}

/* ---------- Buton ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--trans);
}
.btn--primary {
  background: linear-gradient(135deg, var(--accent), #8a6cff);
  color: #fff;
  box-shadow: 0 8px 24px var(--glow);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px var(--glow); }
.btn--ghost {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}
.btn--ghost:hover { background: var(--surface-2); }
.btn--disabled { opacity: 0.55; cursor: default; }
.btn--disabled:hover { transform: none; }

/* ---------- Section başlıkları ---------- */
.section { padding: 72px 0; }
.section__head { margin-bottom: 38px; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-2);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.section__title {
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-top: 6px;
}
.section__desc { color: var(--text-dim); margin-top: 8px; max-width: 560px; }

/* ---------- Hero ---------- */
.hero {
  padding: clamp(60px, 11vw, 120px) 0 70px;
  position: relative;
}
.hero__inner { max-width: 760px; }
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 7px 14px;
  border-radius: 999px;
  margin-bottom: 24px;
}
.hero__badge .pulse {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 0 var(--accent-2);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(56, 225, 196, 0.6); }
  70%  { box-shadow: 0 0 0 10px rgba(56, 225, 196, 0); }
  100% { box-shadow: 0 0 0 0 rgba(56, 225, 196, 0); }
}
.hero h1 {
  font-size: clamp(2.3rem, 6vw, 4rem);
  font-weight: 850;
  line-height: 1.08;
  letter-spacing: -0.03em;
}
.hero h1 .grad {
  background: linear-gradient(120deg, var(--accent), var(--accent-2), var(--accent-3));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p.lead {
  color: var(--text-dim);
  font-size: 1.12rem;
  margin-top: 20px;
  max-width: 600px;
}
.hero__actions { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Kart ızgarası ---------- */
.grid { display: grid; gap: 22px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--trans);
  position: relative;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.card__tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent-2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.card__title { font-size: 1.2rem; font-weight: 700; margin: 8px 0; }
.card__text { color: var(--text-dim); font-size: 0.95rem; }
.card__meta {
  margin-top: 16px;
  font-size: 0.82rem;
  color: var(--text-mute);
  font-family: var(--font-mono);
}

/* Büyük renkli ikonlu kart (bölüm girişleri) */
.feature {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.feature__icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: grid; place-items: center;
  font-size: 1.5rem;
  margin-bottom: 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}
.feature__arrow { margin-top: 14px; color: var(--accent); font-weight: 600; font-size: 0.9rem; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  margin-top: 40px;
  color: var(--text-mute);
  font-size: 0.9rem;
}
.footer__inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.tr-clock {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  white-space: nowrap;
}
.footer__social { display: flex; gap: 16px; }
.footer__social a { transition: var(--trans); }
.footer__social a:hover { color: var(--accent); }

/* ---------- Blog filtreleri (chip) ---------- */
.blog__filters { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.chip {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 7px 15px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  cursor: pointer;
  transition: var(--trans);
}
.chip:hover { color: var(--text); border-color: var(--accent); }
.chip--on { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ---------- Yazı okuma sayfası ---------- */
.article { max-width: 760px; padding-top: 40px; padding-bottom: 40px; }
.article__back {
  display: inline-block;
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-bottom: 28px;
  transition: var(--trans);
}
.article__back:hover { color: var(--accent); }
.article__head { margin-bottom: 30px; }
.article__title {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 850;
  letter-spacing: -0.02em;
  line-height: 1.12;
  margin: 12px 0;
}
.article__meta { color: var(--text-mute); font-family: var(--font-mono); font-size: 0.85rem; }
.article__cover { width: 100%; border-radius: var(--radius); margin-bottom: 30px; border: 1px solid var(--border); }
.article__body { font-size: 1.08rem; color: var(--text); }
.article__body p { margin: 0 0 20px; color: #cdd5e8; }
.article__body h2 { font-size: 1.5rem; font-weight: 750; margin: 36px 0 14px; letter-spacing: -0.01em; }
.article__body h3 { font-size: 1.2rem; font-weight: 700; margin: 28px 0 10px; }
.article__body ul, .article__body ol { margin: 0 0 20px 22px; color: #cdd5e8; }
.article__body li { margin-bottom: 8px; }
.article__body a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.article__body a:hover { color: var(--accent-2); }
.article__body blockquote {
  border-left: 3px solid var(--accent);
  padding: 6px 0 6px 20px;
  margin: 0 0 24px;
  color: var(--text-dim);
  font-style: italic;
}
.article__body pre {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
  overflow-x: auto;
  margin: 0 0 22px;
}
.article__body code { font-family: var(--font-mono); font-size: 0.9rem; }
.article__body strong { color: var(--text); }
.article__fig { margin: 0 0 24px; }
.article__fig img {
  width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  display: block;
}
.article__fig figcaption {
  font-size: 0.82rem;
  color: var(--text-mute);
  margin-top: 8px;
  font-family: var(--font-mono);
}
.article__note {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--text-mute);
}

/* ---------- Projeler ---------- */
.proj__top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
}
.badge--ok   { color: var(--accent-2); border-color: rgba(56,225,196,0.4); background: rgba(56,225,196,0.08); }
.badge--wip  { color: #ffd166; border-color: rgba(255,209,102,0.4); background: rgba(255,209,102,0.08); }
.badge--idea { color: var(--text-dim); }
.pills { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 16px; }
.pill {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-dim);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  padding: 3px 9px;
  border-radius: 7px;
}
.proj__links { display: flex; gap: 16px; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--border); }
.proj__link { color: var(--accent); font-weight: 600; font-size: 0.9rem; transition: var(--trans); }
.proj__link:hover { color: var(--accent-2); }

/* ---------- Mühendislik ---------- */
.eng-section { margin-bottom: 56px; }
.eng-section .section__head { margin-bottom: 26px; }

.eng-theory__name {
  font-size: 1.05rem;
  font-weight: 750;
  margin-bottom: 8px;
  color: var(--accent-2);
  line-height: 1.3;
}

/* Dev proje kartları (görselli) */
.eng-proj {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--trans);
  display: flex;
  flex-direction: column;
}
.eng-proj:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: var(--shadow); }
.eng-proj__media {
  position: relative;
  aspect-ratio: 16 / 10;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--surface-2), var(--bg-soft));
  overflow: hidden;
}
.eng-proj__icon { font-size: 3rem; opacity: 0.5; }
.eng-proj__media img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.eng-proj__tag {
  position: absolute; top: 10px; left: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: rgba(12,15,23,0.75);
  backdrop-filter: blur(6px);
  border: 1px solid var(--border);
  color: var(--accent-2);
  padding: 4px 10px;
  border-radius: 999px;
  z-index: 1;
}
.eng-proj__body { padding: 18px 20px; }
.eng-proj__title { font-size: 1.15rem; font-weight: 750; }
.eng-proj__loc { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-mute); margin: 4px 0 10px; }

/* ---------- Müzik oynatıcı ---------- */
.player-wrap { max-width: 620px; }
.player {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  margin-bottom: 22px;
}
.player__art {
  width: 120px; height: 120px;
  margin: 0 auto 18px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 3rem;
  background: linear-gradient(135deg, var(--surface-2), var(--bg-soft));
  border: 1px solid var(--border);
}
.player__art.art--spin { animation: spin 8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.player__title { font-size: 1.25rem; font-weight: 750; }
.player__artist { color: var(--text-dim); font-size: 0.92rem; margin-top: 2px; }
.player__bar { display: flex; align-items: center; gap: 12px; margin: 22px 0 18px; font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-mute); }
.player__track { flex: 1; height: 7px; background: var(--bg); border: 1px solid var(--border); border-radius: 999px; cursor: pointer; overflow: hidden; }
.player__fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width 0.1s linear; }
.player__controls { display: flex; justify-content: center; align-items: center; gap: 18px; }
.player__btn {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  width: 48px; height: 48px;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--trans);
}
.player__btn:hover { border-color: var(--accent); color: var(--accent); }
.player__btn--play {
  width: 62px; height: 62px;
  font-size: 1.4rem;
  background: linear-gradient(135deg, var(--accent), #8a6cff);
  color: #fff;
  border: none;
  box-shadow: 0 8px 22px var(--glow);
}
.player__btn--play:hover { color: #fff; transform: scale(1.05); }

.playlist { display: flex; flex-direction: column; gap: 8px; }
.ptrack {
  display: flex; align-items: center; gap: 14px;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  cursor: pointer;
  transition: var(--trans);
  color: var(--text);
}
.ptrack:hover { border-color: var(--accent); }
.ptrack--on { border-color: var(--accent); background: var(--surface-2); }
.ptrack__no { font-family: var(--font-mono); color: var(--text-mute); width: 22px; text-align: center; }
.ptrack--on .ptrack__no { color: var(--accent-2); }
.ptrack__meta { display: flex; flex-direction: column; }
.ptrack__title { font-weight: 600; }
.ptrack__artist { font-size: 0.82rem; color: var(--text-dim); }

/* ---------- Haberler / Zaman tüneli ---------- */
.timeline { position: relative; padding-left: 8px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 25px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(var(--accent), var(--accent-2), transparent);
  opacity: 0.4;
}
.tl-item { display: flex; gap: 20px; margin-bottom: 26px; position: relative; }
.tl-dot {
  width: 52px; height: 52px;
  flex-shrink: 0;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 1.3rem;
  background: var(--surface);
  border: 1px solid var(--border);
  z-index: 1;
}
.tl-body {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  transition: var(--trans);
}
.tl-body:hover { border-color: var(--accent); transform: translateX(3px); }
.tl-meta { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-mute); }
.tl-type { color: var(--accent-2); }
.tl-title { font-size: 1.15rem; font-weight: 700; margin: 6px 0; }
.tl-text { color: var(--text-dim); font-size: 0.95rem; }
.tl-link { display: inline-block; margin-top: 12px; color: var(--accent); font-weight: 600; font-size: 0.9rem; transition: var(--trans); }
.tl-link:hover { color: var(--accent-2); }

@media (max-width: 560px) {
  .timeline::before { left: 21px; }
  .tl-dot { width: 44px; height: 44px; font-size: 1.1rem; }
}

/* ---------- Ziyaretçi / çevrim içi rozeti ---------- */
.site-stats {
  position: fixed;
  top: 76px;
  left: 16px;
  z-index: 70;
  background: rgba(22, 28, 46, 0.9);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 9px 13px;
  font-size: 0.8rem;
  color: var(--text-dim);
  box-shadow: var(--shadow);
  line-height: 1.5;
}
.site-stats__row { display: flex; align-items: center; gap: 6px; white-space: nowrap; }
.site-stats__row b { color: var(--text); font-weight: 700; }
.site-stats__row--muted { color: var(--text-mute); margin-top: 2px; }
.site-stats__dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 0 var(--accent-2);
  animation: pulse 2s infinite;
}
@media (max-width: 720px) {
  .site-stats { top: auto; bottom: 16px; left: 16px; font-size: 0.74rem; padding: 7px 11px; }
}

/* ---------- Mini oynatıcı (kalıcı) ---------- */
.mini {
  position: fixed;
  bottom: 18px;
  right: 18px;
  z-index: 80;
  display: none;
  align-items: center;
  gap: 12px;
  background: rgba(22, 28, 46, 0.92);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 12px 8px 8px;
  box-shadow: var(--shadow);
  max-width: calc(100vw - 36px);
}
.mini.show { display: flex; }
.mini__art {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 1.1rem;
  background: linear-gradient(135deg, var(--surface-2), var(--bg-soft));
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.mini__meta { min-width: 120px; max-width: 180px; }
.mini__title {
  font-size: 0.85rem; font-weight: 600;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.mini__bar { height: 4px; background: var(--bg); border-radius: 999px; margin-top: 5px; overflow: hidden; }
.mini__fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.mini__btn {
  background: none; border: none; color: var(--text-dim);
  cursor: pointer; font-size: 1rem; padding: 4px;
  transition: var(--trans); flex-shrink: 0;
}
.mini__btn:hover { color: var(--text); }
.mini__btn--play {
  width: 38px; height: 38px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #8a6cff);
  color: #fff; font-size: 1rem;
}
.mini__btn--play:hover { color: #fff; }

@media (max-width: 480px) {
  .mini__meta { min-width: 80px; max-width: 110px; }
}

/* ---------- Galeri ---------- */
.gallery {
  columns: 3 260px;
  column-gap: 16px;
}
.gallery__item {
  display: block;
  width: 100%;
  margin: 0 0 16px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  background: var(--surface);
  position: relative;
  break-inside: avoid;
  transition: var(--trans);
}
.gallery__item:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: var(--shadow); }
.gallery__item img { width: 100%; height: auto; display: block; }
.gallery__cap {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 22px 14px 10px;
  text-align: left;
  font-size: 0.85rem;
  color: #fff;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  opacity: 0;
  transition: var(--trans);
}
.gallery__item:hover .gallery__cap { opacity: 1; }

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(6, 8, 14, 0.92);
  backdrop-filter: blur(6px);
  padding: 30px;
}
.lightbox.open { display: flex; }
.lightbox__fig { margin: 0; max-width: 90vw; max-height: 88vh; text-align: center; }
.lightbox__fig img {
  max-width: 90vw;
  max-height: 80vh;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}
.lightbox__fig figcaption { color: var(--text-dim); margin-top: 14px; font-size: 0.95rem; }
.lightbox__close, .lightbox__nav {
  position: absolute;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  border-radius: 50%;
  width: 48px; height: 48px;
  font-size: 1.6rem;
  display: grid; place-items: center;
  transition: var(--trans);
}
.lightbox__close:hover, .lightbox__nav:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.lightbox__close { top: 22px; right: 22px; font-size: 1.2rem; }
.lightbox__nav--prev { left: 22px; top: 50%; transform: translateY(-50%); }
.lightbox__nav--next { right: 22px; top: 50%; transform: translateY(-50%); }

@media (max-width: 620px) {
  .lightbox__nav { width: 40px; height: 40px; }
  .lightbox__nav--prev { left: 8px; }
  .lightbox__nav--next { right: 8px; }
}

/* ---------- Ders notları ---------- */
.card--soon { opacity: 0.6; cursor: default; }
.card--soon:hover { transform: none; border-color: var(--border); box-shadow: none; }
.card--soon .feature__arrow { color: var(--text-mute); }

.ders { max-width: 820px; padding-top: 40px; padding-bottom: 50px; }
.ders__head { margin: 14px 0 24px; }
.ders__title { font-size: clamp(1.9rem, 4vw, 2.6rem); font-weight: 850; letter-spacing: -0.02em; margin-top: 6px; }
.ders__sub { color: var(--text-dim); margin-top: 6px; }
.ders__toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin-bottom: 36px;
}
.ders__toc-title { font-weight: 700; margin-bottom: 10px; font-size: 0.95rem; }
.ders__toc ol { margin: 0; padding-left: 20px; columns: 2; }
.ders__toc li { margin-bottom: 6px; }
.ders__toc a { color: var(--text-dim); font-size: 0.92rem; transition: var(--trans); }
.ders__toc a:hover { color: var(--accent); }

.ders__topic { margin-bottom: 30px; scroll-margin-top: 80px; }
.ders__h2 { font-size: 1.35rem; font-weight: 750; margin-bottom: 12px; display: flex; align-items: center; gap: 12px; }
.ders__num {
  flex-shrink: 0;
  width: 30px; height: 30px;
  display: grid; place-items: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; font-size: 0.95rem; font-weight: 800;
}
.ders__topic p { color: #cdd5e8; margin-bottom: 12px; line-height: 1.7; }
.ders-f {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text);
  overflow-x: auto;
}
.ders-ex {
  background: rgba(56, 225, 196, 0.06);
  border: 1px solid rgba(56, 225, 196, 0.25);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.95rem;
}
.ders-ex b { color: var(--accent-2); }
.ders__soon {
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  font-size: 1.1rem;
}
.ders__soon p { margin-bottom: 8px; }

@media (max-width: 600px) { .ders__toc ol { columns: 1; } }

/* ---------- Yardımcılar ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s, transform 0.6s; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .nav__toggle { display: block; }
  .nav__links {
    position: absolute;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
    padding: 12px;
    gap: 4px;
    display: none;
  }
  .nav__links.open { display: flex; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}