:root {
  --sis-navy: #253A5F;
  --sis-orange: #F6A21A;
  --sis-magenta: #B5165B;
  --sis-light: #F7F8FB;
  --sis-border: #E6E9F0;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; background: var(--sis-light); color: #172033; }
a { color: var(--sis-navy); text-decoration: none; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.header { background: #fff; border-bottom: 1px solid var(--sis-border); position: sticky; top: 0; z-index: 10; }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; color: var(--sis-navy); }
.brand img { height: 48px; width: auto; }
.nav { display: flex; gap: 14px; align-items: center; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 0; border-radius: 14px; padding: 12px 18px; font-weight: 800; cursor: pointer; transition: .15s ease; }
.btn-primary { background: var(--sis-orange); color: #211400; }
.btn-primary:hover { filter: brightness(.96); transform: translateY(-1px); }
.btn-navy { background: var(--sis-navy); color: white; }
.btn-danger { background: var(--sis-magenta); color: white; }
.hero { padding: 56px 0 36px; background: linear-gradient(135deg, #fff 0%, #fff7e7 55%, #fdebf3 100%); }
.hero-grid { display: grid; grid-template-columns: 1.35fr .65fr; gap: 28px; align-items: center; }
.kicker { color: var(--sis-magenta); font-weight: 900; letter-spacing: .08em; text-transform: uppercase; font-size: 13px; }
h1 { font-size: clamp(34px, 5vw, 58px); line-height: 1.02; margin: 12px 0; color: var(--sis-navy); }
h2 { color: var(--sis-navy); margin-top: 0; }
.lead { font-size: 18px; line-height: 1.65; max-width: 720px; }
.card { background: #fff; border: 1px solid var(--sis-border); border-radius: 24px; padding: 24px; box-shadow: 0 16px 42px rgba(37,58,95,.08); }
.info-list { display: grid; gap: 12px; margin-top: 18px; }
.info-row { display: flex; justify-content: space-between; gap: 16px; border-bottom: 1px dashed var(--sis-border); padding-bottom: 10px; }
.info-row strong { color: var(--sis-navy); }
.section { padding: 38px 0; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: grid; gap: 7px; }
.field.full { grid-column: 1 / -1; }
label { font-weight: 800; color: var(--sis-navy); }
input, textarea, select { width: 100%; border: 1px solid var(--sis-border); border-radius: 14px; padding: 13px 14px; font: inherit; background: #fff; }
input:focus, textarea:focus, select:focus { outline: 3px solid rgba(246,162,26,.22); border-color: var(--sis-orange); }
.student-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; margin-bottom: 10px; }
.summary { background: #fff8eb; border: 1px solid #ffe1a8; border-radius: 18px; padding: 18px; }
.summary strong { color: var(--sis-navy); }
.notice { background: #eef3ff; border: 1px solid #dbe6ff; border-radius: 18px; padding: 16px; color: var(--sis-navy); }
.table-wrap { overflow-x: auto; border-radius: 18px; border: 1px solid var(--sis-border); }
table { width: 100%; border-collapse: collapse; background: #fff; }
th, td { text-align: left; padding: 13px 14px; border-bottom: 1px solid var(--sis-border); vertical-align: top; }
th { background: #f5f7fb; color: var(--sis-navy); }
.badge { display: inline-flex; border-radius: 999px; padding: 5px 10px; font-size: 12px; font-weight: 900; }
.badge.unpaid { background: #fff2cc; color: #6b4b00; }
.badge.waiting_verification { background: #dbeafe; color: #1d4ed8; }
.badge.paid { background: #dcfce7; color: #166534; }
.badge.rejected { background: #ffe4e6; color: #be123c; }
.admin-shell { display: grid; grid-template-columns: 250px 1fr; min-height: 100vh; }
.sidebar { background: var(--sis-navy); color: #fff; padding: 24px; }
.sidebar a { display: block; color: #fff; padding: 12px 0; font-weight: 700; opacity: .9; }
.admin-main { padding: 28px; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 20px; }
.stat { background: #fff; border-radius: 18px; padding: 18px; border: 1px solid var(--sis-border); }
.stat b { display: block; font-size: 28px; color: var(--sis-navy); margin-top: 8px; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }
.error { color: #be123c; font-size: 13px; font-weight: 700; }
.success { background: #dcfce7; color: #166534; border-radius: 14px; padding: 12px 14px; margin-bottom: 14px; font-weight: 800; }
@media (max-width: 860px) {
  .hero-grid, .grid-2, .form-grid, .admin-shell, .stats { grid-template-columns: 1fr; }
  .nav { display: none; }
  .sidebar { position: static; }
}