:root {
  --bg: #f3f7f7;
  --card: #ffffff;
  --text: #17312f;
  --muted: #6b7f7d;
  --line: #dce8e6;
  --primary: #0f766e;
  --primary-dark: #0b5f59;
  --soft: #e8f5f3;
  --danger: #b42318;
  --danger-bg: #fff1f0;
  --success: #067647;
  --success-bg: #ecfdf3;
  --warning: #9a6700;
  --warning-bg: #fff8db;
  --shadow: 0 18px 48px rgba(15, 73, 69, .10);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(15,118,110,.11), transparent 30%),
    linear-gradient(180deg, #f8fbfb 0%, var(--bg) 100%);
}
.page-shell { width: min(820px, calc(100% - 28px)); margin: 0 auto; padding: 38px 0 54px; }
.hero { display: flex; gap: 18px; align-items: center; margin-bottom: 22px; }
.brand-mark {
  width: 68px; height: 68px; flex: 0 0 68px; display: grid; place-items: center;
  border-radius: 20px; background: var(--primary); color: #fff; font-weight: 800; letter-spacing: .5px;
  box-shadow: 0 12px 28px rgba(15,118,110,.22);
}
.eyebrow { margin: 0 0 5px; font-size: 12px; font-weight: 800; letter-spacing: 1.6px; color: var(--primary); }
h1 { margin: 0; font-size: clamp(26px, 4vw, 38px); line-height: 1.14; }
.subtitle { margin: 8px 0 0; color: var(--muted); line-height: 1.55; }
.card { background: var(--card); border: 1px solid rgba(15,118,110,.10); border-radius: 24px; padding: 26px; box-shadow: var(--shadow); }
.grid { display: grid; gap: 16px; }
.grid.two { grid-template-columns: repeat(2, minmax(0,1fr)); }
.field { display: block; margin-bottom: 18px; }
.field > span { display: block; margin-bottom: 8px; font-weight: 700; font-size: 14px; }
.field b { color: #d92d20; }
.field small { display: block; margin-top: 7px; color: var(--muted); }
input, select, textarea {
  width: 100%; border: 1px solid var(--line); background: #fff; color: var(--text); border-radius: 13px;
  padding: 13px 14px; font: inherit; outline: none; transition: border-color .18s, box-shadow .18s, background .18s;
}
input, select { min-height: 48px; }
textarea { resize: vertical; min-height: 92px; }
input:focus, select:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(15,118,110,.10); }
input.invalid, select.invalid, textarea.invalid { border-color: #d92d20; box-shadow: 0 0 0 4px rgba(217,45,32,.08); }
.policy-box {
  display: flex; gap: 10px; align-items: flex-start; margin: 3px 0 20px; padding: 13px 14px;
  border-radius: 13px; background: var(--soft); color: #285c58; font-size: 13px; line-height: 1.45;
}
.policy-box strong { white-space: nowrap; }
.primary-btn, .secondary-btn {
  width: 100%; min-height: 52px; border: 0; border-radius: 14px; font: inherit; font-weight: 800; cursor: pointer; transition: .18s ease;
}
.primary-btn { background: var(--primary); color: white; box-shadow: 0 12px 24px rgba(15,118,110,.20); }
.primary-btn:hover { background: var(--primary-dark); transform: translateY(-1px); }
.primary-btn:disabled { opacity: .68; cursor: not-allowed; transform: none; }
.secondary-btn { background: #eef5f4; color: var(--primary-dark); }
.alert { margin-bottom: 18px; padding: 13px 14px; border-radius: 13px; line-height: 1.45; font-weight: 650; }
.alert.error { color: var(--danger); background: var(--danger-bg); border: 1px solid #fecdca; }
.alert.success { color: var(--success); background: var(--success-bg); border: 1px solid #abefc6; }
.spinner { display: none; width: 18px; height: 18px; border: 2px solid rgba(255,255,255,.45); border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite; }
.primary-btn.loading .spinner { display: inline-block; vertical-align: -4px; margin-left: 9px; }
@keyframes spin { to { transform: rotate(360deg); } }

.success-card { margin-top: 18px; }
.success-heading { display: flex; align-items: center; gap: 16px; margin-bottom: 22px; }
.success-heading h2 { margin: 0; font-size: clamp(22px, 4vw, 30px); }
.success-note { margin: 6px 0 0; color: var(--muted); }
.success-icon {
  width: 64px; height: 64px; flex: 0 0 64px; border-radius: 50%; display: grid; place-items: center;
  background: var(--success-bg); color: var(--success); font-size: 32px; font-weight: 900;
}
.registration-ticket {
  overflow: hidden;
  border: 1px solid #cee1de;
  border-radius: 20px;
  background: linear-gradient(180deg, #f7fffd 0%, #fff 38%);
  box-shadow: inset 0 1px 0 #fff;
}
.ticket-top {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 16px;
  padding: 22px; border-bottom: 1px solid #e1ecea;
}
.ticket-label { display: block; margin-bottom: 5px; color: var(--muted); font-weight: 800; font-size: 11px; letter-spacing: 1.2px; }
.generated-code { color: #123b37; font-size: clamp(27px, 6vw, 38px); font-weight: 900; letter-spacing: .7px; overflow-wrap: anywhere; }
.type-badge { padding: 8px 12px; border-radius: 999px; background: var(--soft); color: var(--primary); font-size: 13px; font-weight: 800; white-space: nowrap; }
.detail-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 4px 22px 16px; }
.detail-row { min-width: 0; padding: 17px 10px 15px 0; border-bottom: 1px solid #edf2f1; }
.detail-row:nth-child(even):not(.full) { padding-left: 12px; }
.detail-row.full { grid-column: 1 / -1; }
.detail-row span { display: block; margin-bottom: 5px; color: var(--muted); font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .3px; }
.detail-row strong { display: block; color: var(--text); font-size: 15px; line-height: 1.5; overflow-wrap: anywhere; white-space: pre-wrap; }
.auto-save-status {
  display: flex; align-items: flex-start; gap: 9px; margin-top: 17px; padding: 12px 14px;
  border-radius: 13px; background: #eef8f6; color: #285c58; font-size: 13px; line-height: 1.45;
}
.status-dot { width: 9px; height: 9px; flex: 0 0 9px; margin-top: 5px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 4px rgba(15,118,110,.10); }
.auto-save-status.saved { background: var(--success-bg); color: var(--success); }
.auto-save-status.saved .status-dot { background: var(--success); box-shadow: 0 0 0 4px rgba(6,118,71,.10); }
.auto-save-status.warning { background: var(--warning-bg); color: var(--warning); }
.auto-save-status.warning .status-dot { background: #e5a000; box-shadow: 0 0 0 4px rgba(229,160,0,.12); }
.auto-save-status.restored { background: #eef4ff; color: #344c75; }
.auto-save-status.restored .status-dot { background: #4b6cb7; box-shadow: 0 0 0 4px rgba(75,108,183,.12); }
.success-actions { display: grid; grid-template-columns: 1.2fr .8fr; gap: 12px; margin-top: 16px; }
.save-help { margin: 12px 4px 0; color: var(--muted); font-size: 12px; line-height: 1.5; text-align: center; }
[hidden] { display: none !important; }

@media (max-width: 650px) {
  .page-shell { width: min(100% - 20px, 820px); padding-top: 22px; }
  .hero { align-items: flex-start; gap: 12px; }
  .brand-mark { width: 54px; height: 54px; flex-basis: 54px; border-radius: 16px; font-size: 14px; }
  .subtitle { font-size: 14px; }
  .card { padding: 18px; border-radius: 19px; }
  .grid.two { grid-template-columns: 1fr; gap: 0; }
  .policy-box { display: block; }
  .policy-box strong { display: block; margin-bottom: 3px; }
  .success-heading { align-items: flex-start; gap: 12px; }
  .success-icon { width: 52px; height: 52px; flex-basis: 52px; font-size: 27px; }
  .ticket-top { padding: 18px; }
  .detail-grid { grid-template-columns: 1fr; padding: 3px 18px 14px; }
  .detail-row, .detail-row:nth-child(even):not(.full) { grid-column: 1 / -1; padding: 14px 0; }
  .success-actions { grid-template-columns: 1fr; }
  .save-btn { min-height: 56px; }
}

/* CAPTCHA chống spam */
.captcha-block {
  margin: 2px 0 18px;
  padding: 16px;
  border: 1px solid #cfe1de;
  border-radius: 15px;
  background: #f8fcfb;
}
.captcha-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.captcha-title { display: block; margin-bottom: 4px; font-size: 14px; font-weight: 800; }
.captcha-title b { color: #d92d20; }
.captcha-head small { color: var(--muted); line-height: 1.4; }
.captcha-refresh {
  flex: 0 0 auto; border: 1px solid #bdd5d1; background: #fff; color: var(--primary-dark);
  border-radius: 10px; min-height: 38px; padding: 8px 12px; font: inherit; font-size: 13px; font-weight: 800; cursor: pointer;
}
.captcha-refresh:hover { background: #eef8f6; }
.captcha-row { display: grid; grid-template-columns: minmax(220px, 1.3fr) minmax(150px, .7fr); gap: 12px; align-items: stretch; }
.captcha-image-wrap {
  min-height: 76px; display: grid; place-items: center; overflow: hidden; border: 1px solid #d7e5e3;
  border-radius: 12px; background: #fff; user-select: none; -webkit-user-select: none;
}
.captcha-image-wrap img { display: block; width: 100%; height: 76px; object-fit: fill; pointer-events: none; }
.captcha-input { min-height: 76px; text-align: center; font-size: 26px; font-weight: 900; letter-spacing: 8px; }
.hp-field { position: absolute !important; left: -10000px !important; width: 1px !important; height: 1px !important; overflow: hidden !important; }

@media (max-width: 650px) {
  .captcha-head { align-items: flex-start; }
  .captcha-row { grid-template-columns: 1fr; }
  .captcha-image-wrap, .captcha-image-wrap img { min-height: 72px; height: 72px; }
  .captcha-input { min-height: 58px; font-size: 24px; }
}