:root {
  --lacivert: #232a45;
  --lacivert-koyu: #12172a;
  --mavi: #2f6fed;
  --mavi-koyu: #1d54c9;
  --acik-gri: #eef0f4;
  --kenar: #e2e5ec;
  --yesil: #1e8e5a;
  --sari: #b8860b;
  --kirmizi: #c0392b;
  --metin: #202b33;
  --lavanta: #ece9fb;
  --lavanta-metin: #6c5ce7;
  --golge: 0 2px 10px rgba(18,23,42,.06);
  --golge-hover: 0 6px 18px rgba(18,23,42,.10);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--acik-gri);
  color: var(--metin);
}
a { color: var(--mavi); text-decoration: none; }
a:hover { text-decoration: underline; }

.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 240px;
  background: var(--lacivert-koyu);
  color: #fff;
  flex-shrink: 0;
  padding: 0 0 18px;
  display: flex;
  flex-direction: column;
}
.sidebar .marka {
  padding: 18px 18px 16px;
  font-weight: 700;
  font-size: 15px;
  line-height: 1.25;
  border-bottom: 1px solid rgba(255,255,255,.08);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.sidebar .marka .marka-metin { display: flex; align-items: center; gap: 10px; }
.sidebar .marka .marka-ikon {
  width: 34px; height: 34px; border-radius: 50%; background: #fff; color: var(--lacivert-koyu);
  display: flex; align-items: center; justify-content: center; font-size: 17px; flex-shrink: 0;
}
.mobil-menu-buton { display: none; background: none; border: 1px solid rgba(255,255,255,.3); color: #fff; border-radius: 6px; padding: 4px 10px; font-size: 15px; cursor: pointer; }
.sidebar-icerik { padding: 0 10px; flex: 1; }
.sidebar a {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #b9c0d4;
  padding: 10px 12px;
  font-size: 14px;
  border-radius: 8px;
  margin-bottom: 2px;
}
.sidebar a svg { flex-shrink: 0; opacity: .85; }
.sidebar a:hover, .sidebar a.aktif { background: rgba(255,255,255,.08); color: #fff; text-decoration: none; }
.sidebar a.aktif { background: var(--mavi); color: #fff; }
.sidebar a.aktif svg { opacity: 1; }
.sidebar .kullanici { padding: 14px 18px; font-size: 12px; color: #9098b0; border-top: 1px solid rgba(255,255,255,.08); margin-top: 8px; }
.sidebar .kullanici a { display: inline; padding: 0; border-radius: 0; }
.sidebar .sidebar-grup { margin-top: 6px; }
.sidebar .grup-baslik {
  display: block;
  padding: 12px 12px 8px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: #6b7291;
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.sidebar .grup-baslik::-webkit-details-marker { display: none; }
.sidebar .grup-baslik::before { content: '▸'; display: inline-block; width: 12px; transition: transform .15s ease; }
.sidebar .sidebar-grup[open] > .grup-baslik::before { transform: rotate(90deg); }
.sidebar .grup-baslik:hover { color: #cfe3f0; }
.sidebar a.alt { padding-left: 34px; font-size: 13.5px; }

.content { flex: 1; padding: 22px 24px; max-width: 1280px; }
.ust-serit { background: #fff; border-radius: 12px; box-shadow: var(--golge); padding: 10px 16px; margin-bottom: 18px; display: flex; justify-content: flex-end; align-items: center; gap: 14px; }
.ust-serit .kullanici-ozet { display: flex; align-items: center; gap: 10px; font-size: 13.5px; color: var(--metin); }
.ust-serit .kullanici-ozet .avatar { width: 30px; height: 30px; border-radius: 50%; background: var(--lavanta); color: var(--lavanta-metin); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 13px; }
.ust-serit .kullanici-ozet .cikis { color: #8a97a0; font-size: 12px; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; flex-wrap: wrap; gap: 10px; }
.topbar h1 { font-size: 20px; margin: 0; color: var(--lacivert-koyu); }

.card { background: #fff; border: 1px solid rgba(18,23,42,.04); border-radius: 14px; padding: 18px; margin-bottom: 18px; display: block; box-shadow: var(--golge); }
.card:target { border-color: var(--mavi); box-shadow: 0 0 0 3px rgba(47,111,237,.25); }
a.card.tiklanir { transition: box-shadow .15s ease, transform .15s ease; }
a.card.tiklanir:hover { box-shadow: var(--golge-hover); transform: translateY(-1px); text-decoration: none; }
.grid { display: grid; gap: 14px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .layout { flex-direction: column; }
  .sidebar { width: 100%; padding: 0; }
  .sidebar .marka { display: flex; justify-content: space-between; align-items: center; padding: 14px 18px; margin-bottom: 0; border-bottom: 1px solid rgba(255,255,255,.12); }
  .mobil-menu-buton { display: inline-block; }
  .sidebar-icerik { display: none; padding-top: 8px; }
  .sidebar.acik .sidebar-icerik { display: block; }
}

.stat { text-align: left; }
.stat .sayi { font-size: 26px; font-weight: 700; color: var(--lacivert-koyu); }
.stat .etiket { font-size: 13px; color: #66757f; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--kenar); }
th { color: #55636b; font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
tr:hover td { background: #fafcfd; }
.tablo-sarici { overflow-x: auto; }

.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge.yesil { background: #e5f5ec; color: var(--yesil); }
.badge.sari { background: #fbf1dd; color: var(--sari); }
.badge.kirmizi { background: #fbe9e7; color: var(--kirmizi); }
.badge.gri { background: #eceff1; color: #546069; }
.badge.mavi { background: #e3f0f9; color: var(--mavi); }

.btn {
  display: inline-block; border: none; cursor: pointer; padding: 10px 18px; border-radius: 8px;
  font-size: 14px; font-weight: 600; background: var(--mavi); color: #fff;
  box-shadow: 0 1px 2px rgba(18,23,42,.08); transition: background .15s ease, box-shadow .15s ease, transform .05s ease;
}
.btn:hover { background: var(--mavi-koyu); text-decoration: none; box-shadow: 0 3px 10px rgba(47,111,237,.28); }
.btn:active { transform: translateY(1px); }
.btn.ikincil { background: #fff; border: 1px solid var(--kenar); color: var(--metin); box-shadow: none; }
.btn.ikincil:hover { background: var(--acik-gri); box-shadow: none; }
.btn.tehlike { background: var(--kirmizi); }
.btn.tehlike:hover { background: #9c2d21; box-shadow: 0 3px 10px rgba(192,57,43,.28); }
.btn.kucuk { padding: 6px 12px; font-size: 12px; border-radius: 7px; }

label { display: block; font-size: 13px; margin: 10px 0 4px; font-weight: 600; color: #445; }
input[type=text], input[type=email], input[type=password], input[type=number], input[type=date], input[type=tel], input[type=file], select, textarea {
  width: 100%; padding: 9px 10px; border: 1px solid var(--kenar); border-radius: 7px; font-size: 14px; font-family: inherit;
}
textarea { min-height: 80px; }
.form-satir { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 16px; }
@media (max-width: 700px) { .form-satir { grid-template-columns: 1fr; } }

.doluluk-cubuk { background: #e6ebee; border-radius: 999px; height: 10px; overflow: hidden; margin: 6px 0; }
.doluluk-cubuk > div { background: var(--mavi); height: 100%; }
.doluluk-cubuk > div.dolu { background: var(--kirmizi); }

.uyari { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: 14px; }
.uyari.basarili { background: #e5f5ec; color: var(--yesil); }
.uyari.hata { background: #fbe9e7; color: var(--kirmizi); }
.uyari.bilgi { background: #e3f0f9; color: var(--mavi); }

.public-sayfa { max-width: 640px; margin: 30px auto; padding: 0 16px; }
.public-kutu { background: #fff; border: 1px solid rgba(18,23,42,.04); border-radius: 14px; padding: 24px; box-shadow: var(--golge); }
.public-baslik { text-align: center; margin-bottom: 20px; }
.public-baslik .logo { font-size: 30px; }

.mini-bar { display: flex; align-items: flex-end; gap: 6px; height: 120px; }
.mini-bar .cubuk { flex: 1; background: var(--mavi); border-radius: 4px 4px 0 0; position: relative; }
.mini-bar .cubuk .etiket-ust { position: absolute; top: -18px; width: 100%; text-align: center; font-size: 11px; color: #55636b; }
.mini-bar .alt-etiket { display: flex; gap: 6px; margin-top: 6px; }
.mini-bar .alt-etiket span { flex: 1; text-align: center; font-size: 11px; color: #66757f; }

.agac-grup { border: 1px solid var(--kenar); border-radius: 8px; margin-bottom: 8px; background: #fff; }
.agac-grup > summary { padding: 10px 14px; font-weight: 600; cursor: pointer; list-style: none; color: var(--lacivert-koyu); }
.agac-grup > summary::-webkit-details-marker { display: none; }
.agac-grup > summary::before { content: '▸'; display: inline-block; width: 14px; color: var(--mavi); }
.agac-grup[open] > summary::before { content: '▾'; }
.agac-ic { padding: 4px 14px 12px 28px; }
.agac-sayi { font-weight: 400; font-size: 12px; color: #66757f; margin-left: 6px; }
.agac-donem > summary { font-weight: 500; }
.ogrenci-kutu { border: 1px solid var(--kenar); border-radius: 8px; margin-bottom: 8px; background: var(--acik-gri); }
.ogrenci-kutu > summary { padding: 8px 12px; cursor: pointer; list-style: none; font-weight: 500; }
.ogrenci-kutu > summary::-webkit-details-marker { display: none; }
.ogrenci-kutu > summary::before { content: '▸'; display: inline-block; width: 14px; color: var(--mavi); }
.ogrenci-kutu[open] > summary::before { content: '▾'; }
.ogrenci-kutu .agac-ic { background: #fff; border-top: 1px solid var(--kenar); padding: 12px 14px; }

.durum-nokta { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; }

.panel-ust-cubuk { display: flex; justify-content: flex-end; align-items: center; gap: 14px; }
.bildirim-zil { position: relative; }
.bildirim-zil > summary {
  list-style: none; cursor: pointer; font-size: 17px; width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 10px; position: relative; background: var(--lavanta); color: var(--lavanta-metin);
}
.bildirim-zil > summary::-webkit-details-marker { display: none; }
.bildirim-zil > summary:hover { background: #e0dbfa; }
.bildirim-rozet { position: absolute; top: 2px; right: 2px; background: var(--kirmizi); color: #fff; font-size: 10px; font-weight: 700; line-height: 1; padding: 3px 5px; border-radius: 999px; }
.bildirim-dropdown { position: absolute; right: 0; top: 100%; margin-top: 4px; width: 340px; max-width: 88vw; max-height: 420px; overflow-y: auto; background: #fff; border: 1px solid var(--kenar); border-radius: 10px; box-shadow: 0 8px 24px rgba(10,44,67,.15); z-index: 50; }
.bildirim-dropdown-baslik { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; border-bottom: 1px solid var(--kenar); position: sticky; top: 0; background: #fff; }
.bildirim-satir { padding: 10px 14px; border-bottom: 1px solid var(--kenar); font-size: 13px; }
.bildirim-satir:last-child { border-bottom: none; }
.bildirim-satir.okunmadi { background: #eaf3fa; }

.link-menu { position: relative; display: inline-block; }
.link-menu > summary { list-style: none; }
.link-menu > summary::-webkit-details-marker { display: none; }
.link-menu-ic { position: absolute; right: 0; top: 100%; margin-top: 4px; background: #fff; border: 1px solid var(--kenar); border-radius: 8px; box-shadow: 0 8px 24px rgba(10,44,67,.15); z-index: 50; min-width: 160px; overflow: hidden; }
.link-menu-ic button, .link-menu-ic a { display: block; width: 100%; text-align: left; padding: 9px 14px; font-size: 13px; color: var(--metin); background: none; border: none; cursor: pointer; box-sizing: border-box; }
.link-menu-ic button:hover, .link-menu-ic a:hover { background: var(--acik-gri); text-decoration: none; }
.link-menu-ic a + button, .link-menu-ic button + a { border-top: 1px solid var(--kenar); }