:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --surface-2: #efede6;
  --text: #1d1f24;
  --muted: #5d6270;
  --border: #dedbd2;
  --accent: #1f4e8c;
  --accent-soft: #e3ebf6;
  --accent-text: #ffffff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 24, 33, 0.06), 0 4px 16px rgba(20, 24, 33, 0.05);
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --serif: "Source Serif 4", Georgia, serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14161b;
    --surface: #1c1f26;
    --surface-2: #252932;
    --text: #e8e9ec;
    --muted: #9aa0ad;
    --border: #2f343e;
    --accent: #7fa8e6;
    --accent-soft: #233149;
    --accent-text: #0f1420;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }

/* Üst menü */
.topbar {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky; top: 0; z-index: 10;
}
.topbar .wrap { display: flex; align-items: center; gap: 16px; height: 60px; }
.brand { font-family: var(--serif); font-weight: 700; font-size: 1.25rem; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand span { color: var(--accent); }
.nav { margin-left: auto; display: flex; gap: 18px; font-size: 0.95rem; }
.nav a { color: var(--muted); }
.nav a:hover, .nav a.active { color: var(--text); text-decoration: none; }

/* Ana sayfa */
.hero { padding: 56px 0 32px; }
.hero h1 { font-family: var(--serif); font-size: clamp(2rem, 4vw, 2.8rem); line-height: 1.15; margin: 0 0 12px; }
.hero p { color: var(--muted); font-size: 1.1rem; max-width: 640px; margin: 0; }

.section-title { font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 32px 0 12px; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; padding-bottom: 48px; }
.card {
  display: flex; flex-direction: column; gap: 8px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow); color: var(--text);
}
a.card:hover { text-decoration: none; border-color: var(--accent); }
.card h3 { margin: 0; font-size: 1.15rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.card .meta { margin-top: auto; padding-top: 8px; font-size: 0.85rem; color: var(--muted); }
.card.soon { opacity: 0.6; }
.badge {
  align-self: flex-start; font-size: 0.75rem; font-weight: 600; padding: 2px 8px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
}

/* Ders sayfası */
.course-head { padding: 28px 0 16px; }
.course-head h1 { font-family: var(--serif); margin: 0 0 6px; font-size: clamp(1.5rem, 3vw, 2rem); }
.course-head p { margin: 0; color: var(--muted); }

.layout { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 24px; padding-bottom: 48px; align-items: start; }
@media (max-width: 900px) { .layout { grid-template-columns: minmax(0, 1fr); } }

.player {
  position: relative; width: 100%; aspect-ratio: 16 / 9; background: #000; border-radius: var(--radius); overflow: hidden;
}
.player iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

.now { margin: 16px 0 8px; }
.now h2 { margin: 0 0 4px; font-size: 1.2rem; line-height: 1.35; }
.now .sub { color: var(--muted); font-size: 0.9rem; }

.controls { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0 20px; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--border); background: var(--surface);
  color: var(--text); border-radius: 10px; padding: 8px 14px; font: inherit; font-size: 0.9rem; cursor: pointer;
}
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn:disabled { opacity: 0.4; cursor: default; }
.btn.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }

.pdf-box { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.pdf-box header { display: flex; align-items: center; gap: 8px; padding: 12px 16px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.pdf-box header strong { margin-right: auto; }
.pdf-frame { width: 100%; height: 75vh; min-height: 420px; border: 0; display: block; background: var(--surface-2); }
.pdf-empty { padding: 24px 16px; color: var(--muted); }
.tab { border: 1px solid var(--border); background: transparent; color: var(--muted); border-radius: 8px; padding: 4px 10px; font: inherit; font-size: 0.85rem; cursor: pointer; }
.tab.active { background: var(--accent-soft); color: var(--accent); border-color: transparent; }

.sidebar { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; position: sticky; top: 76px; }
@media (max-width: 900px) { .sidebar { position: static; } }
.sidebar .search { padding: 12px; border-bottom: 1px solid var(--border); }
.sidebar input {
  width: 100%; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font: inherit; font-size: 0.95rem;
}
.sidebar .count { font-size: 0.8rem; color: var(--muted); margin-top: 8px; }
.list { list-style: none; margin: 0; padding: 0; max-height: calc(100vh - 220px); overflow-y: auto; }
@media (max-width: 900px) { .list { max-height: 420px; } }
.list li button {
  width: 100%; text-align: left; display: grid; grid-template-columns: 34px 1fr; gap: 8px; align-items: start;
  background: transparent; border: 0; border-bottom: 1px solid var(--border); padding: 10px 12px;
  color: var(--text); font: inherit; font-size: 0.9rem; cursor: pointer; line-height: 1.4;
}
.list li button:hover { background: var(--surface-2); }
.list li button.active { background: var(--accent-soft); }
.list .num { color: var(--muted); font-variant-numeric: tabular-nums; font-size: 0.8rem; padding-top: 2px; }
.list .pdf-dot { display: inline-block; margin-left: 6px; font-size: 0.7rem; color: var(--accent); font-weight: 600; }

.notice { background: var(--surface); border: 1px dashed var(--border); border-radius: var(--radius); padding: 24px; color: var(--muted); margin-bottom: 48px; }

/* İletişim sayfası */
.cards.services { padding-bottom: 8px; }
.contact-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 24px; padding-bottom: 56px; align-items: start; }
@media (max-width: 900px) { .contact-layout { grid-template-columns: minmax(0, 1fr); } }
.contact-form { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; display: grid; gap: 16px; box-shadow: var(--shadow); }
.contact-form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 600px) { .contact-form .row { grid-template-columns: 1fr; } }
.contact-form label { display: grid; gap: 6px; font-size: 0.9rem; font-weight: 600; }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font: inherit; font-weight: 400; font-size: 0.95rem;
}
.contact-form textarea { resize: vertical; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
.btn.big { justify-self: start; padding: 11px 20px; font-size: 1rem; font-weight: 600; }
.form-note { margin: 0; font-size: 0.85rem; color: var(--muted); }
.form-error { margin: 0; color: #c0392b; font-size: 0.9rem; }
.contact-side { display: grid; gap: 16px; }
.btn.wa { background: #1f8f4e; border-color: #1f8f4e; color: #fff; align-self: flex-start; margin-top: 4px; }

.cta { background: var(--accent-soft); border-radius: var(--radius); padding: 24px; display: flex; gap: 16px; align-items: center; justify-content: space-between; flex-wrap: wrap; margin-bottom: 48px; }
.cta h3 { margin: 0 0 4px; }
.cta p { margin: 0; color: var(--muted); }

footer { border-top: 1px solid var(--border); color: var(--muted); font-size: 0.85rem; }
footer .wrap { padding-top: 20px; padding-bottom: 28px; display: flex; gap: 16px; flex-wrap: wrap; }

/* Yazılar: liste sayfası */
.series-wrap { display: grid; gap: 12px; max-width: 820px; padding-bottom: 56px; }
.series { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; scroll-margin-top: 76px; }
.series summary { display: flex; align-items: center; gap: 12px; padding: 18px 20px; cursor: pointer; list-style: none; }
.series summary::-webkit-details-marker { display: none; }
.series summary::after { content: ""; width: 9px; height: 9px; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: rotate(45deg); margin: -4px 4px 0 0; transition: transform 0.15s; }
.series[open] summary::after { transform: rotate(225deg); margin-top: 4px; }
.series summary:hover { background: var(--surface-2); }
.series summary:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.series-name { font-family: var(--serif); font-weight: 700; font-size: 1.2rem; }
.series-count { margin-left: auto; font-size: 0.85rem; color: var(--muted); white-space: nowrap; }
.series-desc { margin: 0; padding: 0 20px 12px; color: var(--muted); font-size: 0.95rem; }
.series-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--border); }
.series-list a { display: grid; grid-template-columns: 44px minmax(0, 1fr) auto; gap: 10px; align-items: baseline; padding: 12px 20px; border-bottom: 1px solid var(--border); color: var(--text); }
.series-list li:last-child a { border-bottom: 0; }
.series-list a:hover { background: var(--surface-2); text-decoration: none; }
.series-list .num { color: var(--muted); font-variant-numeric: tabular-nums; font-size: 0.85rem; }
.series-list .t { font-weight: 600; }
.series-list .d { color: var(--muted); font-size: 0.85rem; white-space: nowrap; }
@media (max-width: 600px) {
  .series-list a { grid-template-columns: 36px minmax(0, 1fr); }
  .series-list .d { grid-column: 2; }
}

/* Yazılar: yazı sayfası */
.article { max-width: 700px; margin: 0 auto; padding: 40px 0 56px; }
.article-series { font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase; font-weight: 600; }
.article-head h1 { font-family: var(--serif); font-size: clamp(1.9rem, 4.5vw, 2.6rem); line-height: 1.15; margin: 10px 0 12px; text-wrap: balance; }
.article-meta { color: var(--muted); font-size: 0.9rem; margin: 0 0 32px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.prose { font-family: var(--serif); font-size: 1.15rem; line-height: 1.75; }
.prose p { margin: 0 0 1.1em; }
.prose h2 { font-family: var(--font); font-size: 1.35rem; line-height: 1.3; margin: 2em 0 0.7em; }
.prose h3 { font-family: var(--font); font-size: 1.05rem; line-height: 1.4; margin: 1.6em 0 0.6em; }
.prose blockquote { margin: 1.2em 0; padding: 4px 0 4px 20px; border-left: 3px solid var(--accent); font-style: italic; }
.prose blockquote p { margin: 0; }
.prose ul, .prose ol { margin: 0 0 1.1em; padding-left: 1.4em; }
.prose li { margin: 0.2em 0; }
.prose strong { font-weight: 700; }
.article-origin { color: var(--muted); font-size: 0.9rem; margin: 40px 0 0; padding-top: 20px; border-top: 1px solid var(--border); }
.related { margin-top: 20px; background: var(--accent-soft); border-radius: var(--radius); padding: 16px 20px; display: grid; gap: 4px; }
.related-label { font-size: 0.8rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.related a { font-weight: 600; }
.prevnext { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 24px; }
.pn { display: grid; gap: 2px; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; background: var(--surface); color: var(--text); font-weight: 600; font-size: 0.95rem; }
.pn span { color: var(--muted); font-weight: 400; font-size: 0.8rem; }
.pn.next { text-align: right; }
.pn:hover { border-color: var(--accent); text-decoration: none; }
@media (max-width: 600px) { .prevnext { grid-template-columns: 1fr; } .pn.next { text-align: left; } }

/* Dar ekranda menü: marka üstte, bağlantılar altta tek satır */
.brand, .nav a { white-space: nowrap; }
@media (max-width: 600px) {
  .topbar .wrap { flex-wrap: wrap; height: auto; padding-top: 10px; gap: 4px 16px; }
  .nav { margin-left: 0; width: 100%; gap: 18px; overflow-x: auto; padding-bottom: 10px; font-size: 0.92rem; }
}

/* Makaleler: yazar katmanı (iç içe akordiyon) */
.author { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; scroll-margin-top: 76px; }
.author > summary { display: flex; align-items: center; gap: 12px; padding: 20px; cursor: pointer; list-style: none; }
.author > summary::-webkit-details-marker { display: none; }
.author > summary::after { content: ""; width: 10px; height: 10px; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: rotate(45deg); margin: -4px 4px 0 0; transition: transform 0.15s; }
.author[open] > summary::after { transform: rotate(225deg); margin-top: 4px; }
.author > summary:hover { background: var(--surface-2); }
.author > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.author-name { font-family: var(--serif); font-weight: 700; font-size: 1.4rem; }
.author-series { display: grid; gap: 10px; padding: 0 12px 12px; border-top: 1px solid var(--border); padding-top: 12px; background: var(--bg); }
.author-series .series { box-shadow: none; }
.series-empty { margin: 0; padding: 14px 20px 18px; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.95rem; }

/* Topluluk */
.community { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 24px; padding-bottom: 56px; align-items: start; }
@media (max-width: 900px) { .community { grid-template-columns: minmax(0, 1fr); } }
.community-main { display: grid; gap: 16px; }
.plain-list { margin: 4px 0 0; padding-left: 1.3em; color: var(--text); font-size: 0.95rem; display: grid; gap: 8px; }
.ask { display: flex; flex-wrap: wrap; gap: 12px 16px; align-items: center; justify-content: space-between; background: var(--accent-soft); border-radius: var(--radius); padding: 16px 20px; margin-bottom: 20px; }
.ask > div { flex: 1 1 280px; min-width: 0; }
.ask p { margin: 4px 0 0; color: var(--muted); font-size: 0.9rem; }
.ask .ask-note { flex-basis: 100%; margin: 0; font-size: 0.85rem; color: var(--accent); }
.ask .ask-note:empty { display: none; }
.article-discuss { margin: 16px 0 0; color: var(--muted); font-size: 0.95rem; }