:root {
  --bg: #08111f;
  --bg-soft: rgba(10, 18, 32, 0.72);
  --card: rgba(255, 255, 255, 0.9);
  --text: #102033;
  --muted: #62748a;
  --line: rgba(130, 148, 174, 0.22);
  --shadow: 0 24px 70px rgba(6, 17, 38, 0.22);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --teacher: #00b4d8;
  --student: #2ecc71;
  --member: #9b59b6;
  --support: #f08c2e;
  --danger: #d92d20;
  --success: #15803d;
  --warning: #b45309;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(0,180,216,.24), transparent 22%),
    radial-gradient(circle at top right, rgba(155,89,182,.18), transparent 24%),
    radial-gradient(circle at bottom, rgba(240,140,46,.15), transparent 28%),
    linear-gradient(135deg, #07111f 0%, #0f172a 55%, #111c32 100%);
  min-height: 100vh;
}

a { color: #0f62fe; text-decoration: none; font-weight: 600; }
a:hover { text-decoration: underline; }

.page-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 32px auto 60px;
}

.hero-card,
.forms-card {
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: var(--shadow);
}

.hero-card {
  display: grid;
  grid-template-columns: 1.35fr 0.9fr;
  gap: 24px;
  padding: 32px;
  border-radius: var(--radius-xl);
  background: linear-gradient(140deg, rgba(14,26,48,.82), rgba(23,35,60,.72));
  color: #f8fbff;
  margin-bottom: 22px;
}

.eyebrow {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
  color: #8be4ff;
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .03em;
  margin-bottom: 14px;
}

.hero-copy h1 {
  margin: 0 0 14px;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.05;
}

.hero-copy p {
  margin: 0;
  color: rgba(245, 248, 255, .82);
  line-height: 1.75;
  max-width: 62ch;
}

.hero-badges {
  display: grid;
  gap: 14px;
  align-content: center;
}

.badge-card {
  padding: 18px 18px;
  border-radius: 18px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.1);
}
.badge-card strong { display: block; font-size: 1.05rem; margin-bottom: 6px; }
.badge-card span { color: rgba(245,248,255,.78); font-size: .96rem; }

.forms-card {
  border-radius: var(--radius-xl);
  padding: 24px;
  background: rgba(245, 249, 255, 0.78);
}

.alert {
  margin-bottom: 18px;
  padding: 14px 16px;
  border-radius: 16px;
  font-weight: 700;
  border: 1px solid transparent;
}
.alert.success { background: rgba(22, 163, 74, .12); color: var(--success); border-color: rgba(22,163,74,.22); }
.alert.error { background: rgba(217, 45, 32, .1); color: var(--danger); border-color: rgba(217,45,32,.18); }
.alert.info { background: rgba(15, 98, 254, .08); color: #0f62fe; border-color: rgba(15,98,254,.16); }

.tab-toolbar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.tab-btn,
.action-btn {
  position: relative;
  overflow: hidden;
  border: none;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .25s ease, opacity .25s ease;
}

.tab-btn {
  padding: 16px 14px;
  border-radius: 18px;
  background: rgba(255,255,255,.75);
  color: #0f1f33;
  font-weight: 800;
  letter-spacing: .01em;
  box-shadow: inset 0 0 0 1px rgba(15,23,42,.06);
}

.tab-btn:hover,
.action-btn:hover { transform: translateY(-2px); }
.tab-btn.active { color: #fff; box-shadow: 0 14px 34px rgba(15,23,42,.18); }
.tab-btn[data-tab='ogretmen'].active { background: linear-gradient(135deg, #08b6d5, #1f7ae0); }
.tab-btn[data-tab='ogrenci'].active { background: linear-gradient(135deg, #34d399, #16996c); }
.tab-btn[data-tab='uye'].active { background: linear-gradient(135deg, #a855f7, #6d28d9); }
.tab-btn[data-tab='destek'].active { background: linear-gradient(135deg, #fb923c, #ea580c); }

.tab-panel {
  display: none;
  background: rgba(255,255,255,.85);
  border: 1px solid rgba(255,255,255,.55);
  border-radius: 24px;
  padding: 28px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.45);
}
.tab-panel.active { display: block; animation: fadeUp .28s ease; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 24px;
}
.panel-head h2 { margin: 0; font-size: clamp(1.3rem, 3vw, 1.8rem); }
.panel-head p { margin: 0; color: var(--muted); line-height: 1.6; max-width: 70ch; }

.smart-form { display: grid; gap: 18px; }
.grid { display: grid; gap: 18px; }
.two-col { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.field { display: grid; gap: 8px; }
.field label {
  font-weight: 700;
  font-size: .95rem;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 14px 15px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
  outline: none;
  transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

.field textarea {
  min-height: 132px;
  resize: vertical;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: rgba(15,98,254,.35);
  box-shadow: 0 0 0 4px rgba(15,98,254,.08);
}

.field.is-error input,
.field.is-error select,
.field.is-error textarea {
  border-color: rgba(217, 45, 32, .45);
  box-shadow: 0 0 0 4px rgba(217,45,32,.06);
}

.error-text {
  min-height: 18px;
  font-size: .82rem;
  color: var(--danger);
}

.check-row {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: .95rem;
  line-height: 1.5;
  color: #203247;
}
.check-row input { margin-top: 4px; }

.conditional-zone,
.payment-box {
  border: 1px solid rgba(15,23,42,.08);
  border-radius: 20px;
  padding: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(245,249,255,.8));
}

.dynamic-fields { display: none; }
.dynamic-fields.active { display: block; animation: fadeUp .24s ease; }

.payment-head h3 { margin: 0 0 8px; }
.payment-head p { margin: 0 0 18px; color: var(--muted); line-height: 1.6; }
.payment-methods {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
}
.payment-panel {
  display: none;
  padding: 16px;
  border-radius: 18px;
  border: 1px dashed rgba(15,23,42,.14);
  background: rgba(255,255,255,.9);
}
.payment-panel.active { display: block; }
.payment-panel h4 { margin: 0 0 10px; }
.placeholder-box,
.qr-placeholder {
  border-radius: 14px;
  background: linear-gradient(135deg, #0f172a, #23314f);
  color: #f8fbff;
  padding: 14px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.qr-placeholder {
  min-height: 148px;
  display: grid;
  place-items: center;
  text-align: center;
  letter-spacing: .12em;
}
.muted { color: var(--muted); }

.form-actions { display: flex; justify-content: flex-end; }
.action-btn {
  min-width: 220px;
  padding: 15px 22px;
  border-radius: 16px;
  color: #fff;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: .01em;
  box-shadow: 0 16px 30px rgba(15,23,42,.18);
}
.action-btn::before,
.tab-btn::before {
  content: '';
  position: absolute;
  inset: -120% auto auto -20%;
  width: 42%;
  height: 320%;
  transform: rotate(20deg);
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.35), transparent);
  animation: sweep 3.4s linear infinite;
}

@keyframes sweep {
  0% { left: -35%; }
  100% { left: 135%; }
}

.action-btn.teacher { background: linear-gradient(135deg, #08b6d5, #1d7fe7); }
.action-btn.student { background: linear-gradient(135deg, #2ecc71, #0f9f64); }
.action-btn.member { background: linear-gradient(135deg, #ad63f9, #7c3aed); }
.action-btn.support { background: linear-gradient(135deg, #fb923c, #ea580c); }

.action-btn:disabled {
  opacity: .7;
  cursor: not-allowed;
  transform: none;
}

@media (max-width: 980px) {
  .hero-card { grid-template-columns: 1fr; }
  .tab-toolbar { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .two-col,
  .payment-methods { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .page-shell { width: min(100% - 18px, 1000px); margin-top: 14px; }
  .hero-card,
  .forms-card,
  .tab-panel { padding: 18px; border-radius: 22px; }
  .tab-toolbar { grid-template-columns: 1fr; }
  .tab-btn { padding: 14px 12px; }
  .action-btn { width: 100%; }
  .form-actions { justify-content: stretch; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
/* ==========================================
   ESERKON KURUMSAL KARTLAR
========================================== */

.kurumsal-card{
position:relative;
background:#fff;
border-radius:22px;
padding:35px 30px;
overflow:hidden;
height:100%;
text-align:center;
box-shadow:0 12px 35px rgba(0,0,0,.08);
transition:.45s;
border:1px solid rgba(37,99,235,.12);
}

.kurumsal-card:hover{
transform:translateY(-12px);
box-shadow:0 30px 60px rgba(37,99,235,.22);
}

.kurumsal-card::before{

content:"";

position:absolute;

top:-120%;

left:-40%;

width:180%;

height:180%;

background:linear-gradient(
120deg,
transparent,
rgba(37,99,235,.08),
transparent);

transform:rotate(25deg);

transition:1s;

}

.kurumsal-card:hover::before{

top:120%;

}

.logo-box{

width:110px;

height:110px;

margin:auto;

border-radius:50%;

background:#f4f8ff;

display:flex;

justify-content:center;

align-items:center;

box-shadow:0 0 35px rgba(37,99,235,.18);

margin-bottom:25px;

}

.logo-box img{

width:72px;

animation:logoRotate 25s linear infinite;

}

@keyframes logoRotate{

from{

transform:rotate(0deg);

}

to{

transform:rotate(360deg);

}

}

.kurumsal-card h3{

font-size:31px;

font-weight:800;

color:#1456c5;

margin-bottom:18px;

}

.kurumsal-card p{

font-size:17px;

line-height:1.9;

color:#222;

margin-bottom:30px;

}

.card-footer-info{

display:flex;

justify-content:center;

gap:18px;

flex-wrap:wrap;

margin-bottom:30px;

}

.card-footer-info span{

background:#eef4ff;

padding:8px 18px;

border-radius:40px;

font-size:14px;

font-weight:700;

color:#1456c5;

}

.card-footer-info i{

margin-right:6px;

}

.card-btn{

display:inline-block;

padding:13px 34px;

border-radius:50px;

background:#2563eb;

color:#fff;

font-weight:700;

text-decoration:none;

transition:.35s;

}

.card-btn:hover{

background:#1748b6;

color:#fff;

letter-spacing:.5px;

box-shadow:0 0 28px rgba(37,99,235,.35);

}

@media(max-width:991px){

.kurumsal-card{

margin-bottom:25px;

}

}
/*==========================================
    PREMIUM EFEKTLER
==========================================*/

/* Kart kenarında akan ışık */

.kurumsal-card::after{
content:"";
position:absolute;
inset:-3px;
border-radius:22px;
padding:2px;
background:linear-gradient(
90deg,
transparent,
#3b82f6,
#60a5fa,
#93c5fd,
transparent);
background-size:300% 300%;
animation:borderFlow 8s linear infinite;

-webkit-mask:
linear-gradient(#fff 0 0) content-box,
linear-gradient(#fff 0 0);

-webkit-mask-composite:xor;
mask-composite:exclude;

pointer-events:none;
}

@keyframes borderFlow{

0%{
background-position:0% 50%;
}

100%{
background-position:300% 50%;
}

}

/* Fare gelince logo hızlansın */

.kurumsal-card:hover .logo-box img{

animation-duration:6s;

}

/* Logo kutusu parlasın */

.kurumsal-card:hover .logo-box{

box-shadow:
0 0 20px #3b82f6,
0 0 40px #60a5fa,
0 0 70px rgba(59,130,246,.45);

transform:scale(1.08);

transition:.5s;

}

/* Başlık efekti */

.kurumsal-card h3{

transition:.4s;

}

.kurumsal-card:hover h3{

color:#0d47c9;

letter-spacing:1px;

}

/* Yazı efekti */

.kurumsal-card p{

transition:.4s;

}

.kurumsal-card:hover p{

color:#111;

}

/* Bilgi kutuları */

.card-footer-info span{

transition:.35s;

}

.kurumsal-card:hover .card-footer-info span{

background:#2563eb;

color:#fff;

transform:translateY(-3px);

}

/* Buton */

.card-btn{

position:relative;

overflow:hidden;

}

.card-btn::before{

content:"";

position:absolute;

top:0;

left:-100%;

width:100%;

height:100%;

background:linear-gradient(
90deg,
transparent,
rgba(255,255,255,.55),
transparent);

transition:.8s;

}

.card-btn:hover::before{

left:120%;

}

/* Kart içine hafif mavi desen */

.kurumsal-card{

background-image:

radial-gradient(circle at 20% 20%, rgba(59,130,246,.05), transparent 35%),

radial-gradient(circle at 80% 70%, rgba(37,99,235,.05), transparent 35%);

}

/* Sayfa başlığı */

#tarihce h2{

font-weight:800;

color:#0f172a;

}

#tarihce p{

font-size:18px;

}