*{box-sizing:border-box}
:root{
  --bg:#071426;
  --bg2:#0c2038;
  --gold:#d6a944;
  --gold2:#ffe29a;
  --text:#f5f7fb;
  --muted:#aeb9c8;
  --card:rgba(11,28,49,.92);
  --line:rgba(214,169,68,.42);
  --green:#35c58a;
  --red:#ef6b73;
  --blue:#4ca4ff;
}
body{
  margin:0;
  color:var(--text);
  font-family:Arial,Helvetica,sans-serif;
  background:
    radial-gradient(circle at 50% 0%, rgba(31,73,119,.45), transparent 45%),
    linear-gradient(135deg,#071321,#102a44 50%,#071321);
  min-height:100vh;
}
body:before{
  content:"";
  position:fixed;inset:0;pointer-events:none;opacity:.12;
  background-image:linear-gradient(120deg,transparent 0 48%,#fff 49%,transparent 50%);
  background-size:220px 220px;
}
.site-header{
  max-width:1180px;margin:auto;padding:22px 24px;
  display:flex;justify-content:space-between;align-items:center;
}
.brand{display:flex;gap:12px;align-items:center}
.brand-mark{
  width:44px;height:44px;border:2px solid var(--gold);border-radius:12px;
  display:grid;place-items:center;color:var(--gold2);font-weight:900;font-size:24px;
  box-shadow:0 0 18px rgba(214,169,68,.18);
}
.brand-title{font-size:20px;font-weight:900;letter-spacing:2px}
.brand-title span{color:var(--gold2)}
.brand-subtitle{font-size:10px;letter-spacing:3px;color:var(--muted);margin-top:3px}
.admin-link{color:var(--muted);text-decoration:none;font-size:13px}
.page{max-width:1180px;margin:0 auto;padding:12px 24px 50px}
.hero{text-align:center;padding:30px 10px 28px}
.hero h1{
  margin:0;font-size:clamp(30px,5vw,54px);letter-spacing:5px;
  color:var(--gold2);text-shadow:0 0 22px rgba(214,169,68,.28);
}
.hero p{color:var(--muted);margin:10px auto 0;max-width:680px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:20px;
  padding:26px;box-shadow:0 18px 55px rgba(0,0,0,.25);
}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.class-card{
  text-decoration:none;color:inherit;padding:28px;border:1px solid var(--line);
  border-radius:18px;background:linear-gradient(145deg,rgba(21,48,78,.9),rgba(7,20,38,.95));
  transition:.2s;display:block;
}
.class-card:hover{transform:translateY(-3px);border-color:var(--gold2);box-shadow:0 12px 30px rgba(214,169,68,.12)}
.class-card h2{margin:0 0 8px;color:var(--gold2)}
.class-card p{color:var(--muted);margin:0 0 20px;line-height:1.5}
.price{font-size:22px;font-weight:800}
.small{font-size:13px;color:var(--muted)}
.section-title{margin:0 0 8px}
.notice{padding:14px 16px;border-radius:12px;background:rgba(76,164,255,.1);border:1px solid rgba(76,164,255,.3);color:#cde6ff;margin-bottom:18px}
.notice.gold{background:rgba(214,169,68,.09);border-color:var(--line);color:#ffe7ae}
.position-hero{
  padding-top:22px;
  padding-bottom:22px;
}
.position-hero h1{
  font-family:Georgia,"Times New Roman",serif;
  font-size:clamp(34px,5vw,58px);
  letter-spacing:4px;
  margin:2px 0 8px;
}
.position-hero p{margin:0;color:#d7dee8}
.gold-line{
  width:150px;height:3px;margin:0 auto 13px;
  background:linear-gradient(90deg,transparent,var(--gold2),transparent);
  box-shadow:0 0 12px rgba(214,169,68,.55);
}
.hero-price{
  display:inline-block;margin-top:12px;padding:7px 15px;
  border:1px solid rgba(214,169,68,.35);border-radius:99px;
  color:var(--gold2);background:rgba(7,20,38,.55);
  font-weight:800;
}
.hero-price span{font-size:12px;color:var(--muted);font-weight:400}
.position-card{
  background:
    radial-gradient(circle at 50% 0%,rgba(43,81,120,.22),transparent 45%),
    rgba(6,19,34,.88);
  border:1px solid rgba(214,169,68,.38);
  border-radius:24px;
  padding:28px 22px 24px;
  box-shadow:0 20px 70px rgba(0,0,0,.32);
  overflow:hidden;
}
.position-top{
  display:flex;justify-content:space-between;align-items:center;
  gap:18px;margin-bottom:20px;
}
.position-top h2{margin:0 0 5px;color:#f5f7fb}
.position-top p{margin:0;color:var(--muted);font-size:14px}
.legend{
  display:flex;justify-content:center;gap:24px;flex-wrap:wrap;
  margin:5px 0 26px;color:#bfc9d5;font-size:12px;
}
.legend>div{display:flex;align-items:center;gap:7px}
.legend-box{
  width:13px;height:13px;border-radius:4px;display:inline-block;
  border:1px solid var(--gold);
}
.available-box{background:linear-gradient(145deg,#173653,#091a2d)}
.pending-box{background:#614817;border-color:#e2a73d}
.paid-box{background:#154f3b;border-color:#4fd09c}
.zigzag-layout{
  width:min(1080px,100%);
  margin:0 auto;
  padding:10px 0 20px;
  background:
    radial-gradient(circle at 50% 50%,rgba(31,72,113,.16),transparent 62%);
}
.seat-row{
  display:flex;
  justify-content:center;
  align-items:center;
  gap:clamp(12px,2.3vw,30px);
  margin-bottom:12px;
}
.seat-row:nth-child(even){
  transform:translateX(clamp(18px,3vw,43px));
}
.seat-row:nth-child(odd){
  transform:translateX(clamp(-18px,-3vw,-43px));
}
.seat{
  width:86px;height:58px;
  display:flex;align-items:center;justify-content:center;
  position:relative;
  color:#fff;text-decoration:none;
  font-size:22px;font-weight:900;
  border-radius:10px;
  border:2px solid var(--gold);
  background:linear-gradient(145deg,#17334f,#091a2d);
  box-shadow:
    0 0 0 4px rgba(214,169,68,.08),
    0 6px 15px rgba(0,0,0,.28);
  transition:transform .16s,box-shadow .16s,background .16s;
}
.seat:before,.seat:after{
  content:"";
  position:absolute;
  top:10px;bottom:10px;width:7px;
  border:2px solid var(--gold);
  border-radius:5px;
  opacity:.95;
}
.seat:before{left:-10px;border-right:0}
.seat:after{right:-10px;border-left:0}
.seat.available:hover{
  transform:translateY(-4px) scale(1.04);
  background:linear-gradient(145deg,#234a6e,#0b2138);
  box-shadow:
    0 0 0 4px rgba(214,169,68,.12),
    0 10px 24px rgba(0,0,0,.35),
    0 0 18px rgba(214,169,68,.16);
}
.seat-step{
  position:absolute;
  left:50%;bottom:3px;transform:translateX(-50%);
  white-space:nowrap;font-size:7px;letter-spacing:.8px;
  color:#8292a5;font-weight:700;
}
.seat.pending{
  border-color:#e2a73d;
  background:linear-gradient(145deg,#654b1c,#332710);
  color:#ffe29a;
}
.seat.paid{
  border-color:#4fd09c;
  background:linear-gradient(145deg,#155a42,#0b3025);
  color:#b8f4d9;
}
.seat.pending:before,.seat.pending:after{border-color:#e2a73d}
.seat.paid:before,.seat.paid:after{border-color:#4fd09c}
.position-note{
  max-width:900px;margin:10px auto 0;
  padding:14px 16px;border-radius:12px;
  background:rgba(214,169,68,.07);
  border:1px solid rgba(214,169,68,.25);
  color:#cbd4df;font-size:13px;line-height:1.55;
  text-align:center;
}
@media(max-width:900px){
  .position-card{padding:22px 10px}
  .position-top{align-items:flex-start;flex-direction:column}
  .seat-row{gap:12px}
  .seat-row:nth-child(even){transform:translateX(15px)}
  .seat-row:nth-child(odd){transform:translateX(-15px)}
  .seat{width:70px;height:51px;font-size:18px}
}
@media(max-width:620px){
  .position-card{padding:18px 4px}
  .legend{gap:12px;margin-bottom:18px}
  .zigzag-layout{padding-left:0;padding-right:0}
  .seat-row{gap:5px;margin-bottom:10px}
  .seat-row:nth-child(even){transform:translateX(7px)}
  .seat-row:nth-child(odd){transform:translateX(-7px)}
  .seat{width:43px;height:40px;font-size:13px;border-width:1.5px;border-radius:7px}
  .seat:before,.seat:after{width:4px;top:7px;bottom:7px;border-width:1.5px}
  .seat:before{left:-6px}.seat:after{right:-6px}
  .seat-step{font-size:5px;bottom:2px}
}
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.field{display:flex;flex-direction:column;gap:7px}
.field.full{grid-column:1/-1}
label{font-weight:700;font-size:14px}
input,select{
  width:100%;padding:13px 14px;border-radius:10px;border:1px solid #3b536d;
  background:#071726;color:#fff;outline:none;
}
input:focus,select:focus{border-color:var(--gold)}
input[type=file]{padding:10px}
.btn{
  display:inline-block;border:0;border-radius:10px;padding:13px 20px;
  background:linear-gradient(135deg,#d7aa48,#a87920);color:#071321;
  font-weight:900;text-decoration:none;cursor:pointer;
}
.btn.secondary{background:#1b344e;color:#fff;border:1px solid #3b536d}
.btn.danger{background:#8d2730;color:#fff}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.error{background:rgba(239,107,115,.12);border:1px solid rgba(239,107,115,.4);padding:12px;border-radius:10px;color:#ffc4c8}
.success{background:rgba(53,197,138,.12);border:1px solid rgba(53,197,138,.35);padding:12px;border-radius:10px;color:#baf3d9}
.summary{
  display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0;
}
.summary-item{background:#091a2d;border:1px solid #28445f;border-radius:12px;padding:15px}
.summary-item b{display:block;font-size:20px;color:var(--gold2);margin-top:5px}
.receipt{
  max-width:700px;margin:auto;border:1px solid var(--gold);border-radius:18px;
  background:#091a2d;padding:28px;
}
.receipt-head{text-align:center;border-bottom:1px dashed #49617b;padding-bottom:20px;margin-bottom:20px}
.receipt-head h1{color:var(--gold2);margin:0 0 6px}
.receipt-row{display:flex;justify-content:space-between;gap:20px;padding:11px 0;border-bottom:1px solid #20364d}
.receipt-row span:first-child{color:var(--muted)}
.big-step{text-align:center;font-size:64px;font-weight:900;color:var(--gold2);margin:15px 0}
.status{display:inline-block;padding:7px 12px;border-radius:99px;font-size:12px;font-weight:900}
.status.PENDING{background:#604714;color:#ffd978}.status.PAID{background:#124d3a;color:#8bf1c4}.status.REJECTED{background:#5e2228;color:#ffadb4}
.admin-table{width:100%;border-collapse:collapse;font-size:14px}
.admin-table th,.admin-table td{padding:11px;border-bottom:1px solid #29425b;text-align:left;vertical-align:top}
.admin-table th{color:var(--gold2)}
.proof{max-width:130px;max-height:100px;border-radius:8px;border:1px solid #45617b}
.site-footer{text-align:center;color:#73849a;padding:25px;font-size:12px}
@media(max-width:750px){
  .form-grid,.summary{grid-template-columns:1fr}
  .field.full{grid-column:auto}
  .admin-table{display:block;overflow:auto;white-space:nowrap}
}