/* Giriş sayfası — sol: koyu kömür alanda Güven Optik logosu; sağ: sade form (panelin tasarım sisteminden) */
:root {
  color-scheme: light;
  --zemin: #f5f6f7;
  --yuzey: #ffffff;
  --komur: #22272b;
  --komur-hover: #353b40;
  --komur-koyu: #1b1f22;
  --murekkep: #1f2427;
  --ikincil: #3f464b;
  --soluk: #5f666c;
  --cizgi: #cfd3d6;
  --hata: #b42a1f;
  --hata-acik: #fbe9e7;
  --basari: #1f7a4d;
  --basari-acik: #e6f2ec;
  --kose: 7px;
  --odak: 0 0 0 3px rgba(34, 39, 43, .14);
  --hiz: 180ms;
  --egri: cubic-bezier(.2, .7, .2, 1);
  --yazi: 'Hellix', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }
button, input { font: inherit; color: inherit; }
html, body { height: 100%; }
body {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(380px, 1fr);
  background: var(--zemin);
  color: var(--murekkep);
  font: 15px/1.5 var(--yazi);
  -webkit-font-smoothing: antialiased;
}

.marka-alan {
  position: relative;
  display: grid;
  place-items: center;
  padding: 48px;
  overflow: hidden;
  background: radial-gradient(110% 85% at 50% 50%, #30363b 0%, var(--komur-koyu) 72%);
}
.marka-alan::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 24px 24px;
  -webkit-mask-image: radial-gradient(70% 60% at 50% 50%, #000 0%, transparent 100%);
  mask-image: radial-gradient(70% 60% at 50% 50%, #000 0%, transparent 100%);
}
.marka-alan img { position: relative; width: min(340px, 70%); height: auto; }

.giris {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 48px clamp(28px, 6vw, 72px);
}
.kart { width: 100%; max-width: 380px; display: flex; flex-direction: column; gap: 26px; }
.kart .logo { display: none; }
h1 { margin: 0; text-align: center; font-size: 28px; font-weight: 600; letter-spacing: -.01em; line-height: 1.2; }
.alt { margin: -20px 0 0; text-align: center; color: var(--soluk); }

form { display: flex; flex-direction: column; gap: 16px; }
.alan { display: flex; flex-direction: column; gap: 6px; }
label { font-size: 13.5px; font-weight: 500; color: var(--ikincil); }
input[type=text], input[type=password] {
  width: 100%;
  height: 46px;
  padding: 0 14px;
  border: 1px solid var(--cizgi);
  border-radius: var(--kose);
  background: var(--yuzey);
  font-size: 15px;
  transition: border-color var(--hiz) var(--egri), box-shadow var(--hiz) var(--egri);
}
input::placeholder { color: var(--soluk); }
input:focus { outline: none; border-color: var(--komur); box-shadow: var(--odak); }

.parola { position: relative; }
.parola input { padding-right: 48px; }
.goster {
  position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  width: 40px; height: 38px; display: grid; place-items: center;
  border: 0; border-radius: var(--kose); background: transparent; color: var(--soluk); cursor: pointer;
  transition: color var(--hiz) var(--egri), background-color var(--hiz) var(--egri);
}
.goster:hover { color: var(--murekkep); background: #eff0f1; }
.goster:focus-visible { outline: none; box-shadow: var(--odak); }
.goster .kapali, .goster[aria-pressed="true"] .acik { display: none; }
.goster[aria-pressed="true"] .kapali { display: inline; }

.gonder {
  height: 48px;
  margin-top: 4px;
  border: 0;
  border-radius: var(--kose);
  background: var(--komur);
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--hiz) var(--egri), box-shadow var(--hiz) var(--egri);
}
.gonder:hover { background: var(--komur-hover); }
.gonder:active { background: #15191c; }
.gonder:focus-visible { outline: none; box-shadow: var(--odak); }
.gonder:disabled { opacity: .5; cursor: not-allowed; }

.unuttum { align-self: center; color: var(--ikincil); font-size: 14px; text-decoration: none; }
.unuttum:hover { color: var(--murekkep); text-decoration: underline; }
.unuttum:focus-visible { outline: none; box-shadow: var(--odak); border-radius: 3px; }

.uyari { padding: 10px 14px; border-radius: var(--kose); font-size: 14px; }
.uyari-hata { background: var(--hata-acik); color: var(--hata); }
.uyari-basari { background: var(--basari-acik); color: var(--basari); }

.telif { margin: 40px 0 0; text-align: center; color: var(--soluk); font-size: 13px; }
.imza { display: block; margin-top: 14px; opacity: .55; transition: opacity var(--hiz) var(--egri); }
.imza:hover { opacity: 1; }
.imza:focus-visible { outline: none; box-shadow: var(--odak); border-radius: 3px; }
.imza img { display: block; width: 40px; height: auto; }

@media (max-width: 860px) {
  body { grid-template-columns: minmax(0, 1fr); grid-template-rows: auto 1fr; }
  .marka-alan { padding: 28px 16px; }
  .marka-alan img { width: min(220px, 60%); }
  .giris { padding: 32px 16px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0ms !important; }
}
.alan-hata { color: var(--hata); font-size: 13px; }