*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --radius: 6px;
  --border: #d1d5db;
  --bg: #f9fafb;
  --text: #111827;
  --muted: #6b7280;
  --badge-paid-bg: #d1fae5; --badge-paid-fg: #065f46;
  --badge-qr-bg: #dbeafe;   --badge-qr-fg: #1e40af;
  --badge-pend-bg: #fef3c7; --badge-pend-fg: #92400e;
  --badge-fail-bg: #fee2e2; --badge-fail-fg: #991b1b;
  --badge-exp-bg:  #f3f4f6; --badge-exp-fg:  #374151;
  --green: #059669;
  --red: #dc2626;
  --blue: #2563eb;
}

body { font-family: var(--font); background: var(--bg); color: var(--text); font-size: 15px; line-height: 1.5; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ── */
.container { max-width: 960px; margin: 0 auto; padding: 24px 16px; }
.page-title { font-size: 1.4rem; font-weight: 700; margin-bottom: 20px; }

/* ── Buttons ── */
.btn { display: inline-block; padding: 8px 16px; border-radius: var(--radius); border: 1px solid transparent; cursor: pointer; font-size: 14px; font-weight: 500; }
.btn-primary { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn-primary:hover { background: #1d4ed8; }
.btn-danger  { background: var(--red);  color: #fff; border-color: var(--red); }
.btn-danger:hover { background: #b91c1c; }
.btn-ghost   { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: #e5e7eb; }

/* ── Status badges ── */
.badge { display: inline-block; padding: 2px 10px; border-radius: 9999px; font-size: 12px; font-weight: 600; white-space: nowrap; }
.badge-paid       { background: var(--badge-paid-bg); color: var(--badge-paid-fg); }
.badge-qr_ready   { background: var(--badge-qr-bg);   color: var(--badge-qr-fg); }
.badge-pending,
.badge-processing { background: var(--badge-pend-bg); color: var(--badge-pend-fg); }
.badge-failed,
.badge-expired    { background: var(--badge-fail-bg); color: var(--badge-fail-fg); }

/* ── Table ── */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { background: #f3f4f6; text-align: left; padding: 10px 14px; font-weight: 600; border-bottom: 1px solid var(--border); white-space: nowrap; }
td { padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: #f9fafb; }
.id-cell { font-family: monospace; font-size: 13px; }

/* ── Filter tabs ── */
.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.tab { padding: 5px 14px; border-radius: var(--radius); border: 1px solid var(--border); font-size: 13px; background: #fff; cursor: pointer; text-decoration: none; color: var(--text); }
.tab:hover { background: #f3f4f6; }
.tab.active { background: var(--blue); color: #fff; border-color: var(--blue); }

/* ── Pagination ── */
.pagination { display: flex; gap: 8px; align-items: center; margin-top: 16px; font-size: 14px; }

/* ── Forms ── */
.form-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 24px; }
.form-row { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 4px; color: var(--muted); }
input[type=text], input[type=password], input[type=number] {
  padding: 7px 10px; border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 14px; background: #fff; width: 100%;
}
input[type=text]:focus, input[type=password]:focus, input[type=number]:focus {
  outline: 2px solid var(--blue); outline-offset: -1px;
}
.input-group { flex: 1; min-width: 140px; }

/* ── Detail card ── */
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 24px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; }
.detail-grid dt { font-size: 12px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.detail-grid dd { font-size: 14px; margin-top: 2px; word-break: break-all; }
@media (max-width: 600px) { .detail-grid { grid-template-columns: 1fr; } }

/* ── Alert / error ── */
.alert { padding: 10px 14px; border-radius: var(--radius); margin-bottom: 16px; font-size: 14px; }
.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.alert-info  { background: #dbeafe; color: #1e40af; border: 1px solid #93c5fd; }

/* ── Login page ── */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.login-card { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 36px 32px; width: 100%; max-width: 360px; }
.login-card h1 { font-size: 1.2rem; font-weight: 700; margin-bottom: 24px; }

/* ── Payment page ── */
.pay-wrap { min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 24px 16px; }
.pay-card { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 28px 24px; width: 100%; max-width: 420px; text-align: center; }
.pay-amount { font-size: 2rem; font-weight: 700; margin: 8px 0 4px; }
.pay-label  { font-size: 13px; color: var(--muted); margin-bottom: 20px; }
.pay-qr img { width: 100%; max-width: 300px; height: auto; border: 1px solid var(--border); border-radius: var(--radius); }
.pay-qr-error { font-size: 13px; color: var(--red); margin-top: 8px; display: none; }
.pay-timer { font-size: 13px; color: var(--muted); margin-top: 10px; }
.pay-timer span { font-weight: 600; }
.pay-status-paid { color: var(--green); }
.pay-status-failed, .pay-status-expired { color: var(--red); }
.pay-ref { font-size: 13px; color: var(--muted); margin-top: 8px; }
.pay-ref strong { color: var(--text); }
.spinner { width: 36px; height: 36px; border: 3px solid #e5e7eb; border-top-color: var(--blue); border-radius: 50%; animation: spin .8s linear infinite; margin: 16px auto; }
@keyframes spin { to { transform: rotate(360deg); } }
.pay-waiting-msg { color: var(--muted); font-size: 14px; }
.pay-connection-warn { font-size: 12px; color: var(--red); margin-top: 12px; display: none; }

/* ── Error page ── */
.error-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; text-align: center; padding: 24px; }
.error-code { font-size: 4rem; font-weight: 800; color: var(--muted); }
.error-msg  { font-size: 1.1rem; margin-top: 8px; margin-bottom: 24px; }

/* ── QR image in admin ── */
.admin-qr { margin-top: 16px; }
.admin-qr img { max-width: 220px; border: 1px solid var(--border); border-radius: var(--radius); }

/* ── Misc ── */
.text-muted { color: var(--muted); }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }
.flex-gap { display: flex; gap: 8px; flex-wrap: wrap; }
nav.topnav { background: #1e293b; color: #fff; padding: 10px 16px; display: flex; gap: 16px; align-items: center; font-size: 14px; }
nav.topnav a { color: #94a3b8; text-decoration: none; }
nav.topnav a:hover { color: #fff; }
nav.topnav .brand { font-weight: 700; color: #fff; margin-right: 8px; }
nav.topnav form { margin-left: auto; }