/* ===== Tokens ===== */
:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #0f172a;
  --text-2: #334155;
  --muted: #64748b;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: #eff6ff;
  --accent-text: #ffffff;
  --code: #b91c1c;
  --code-bg: #fef2f2;
  --ok: #15803d;
  --ok-soft: #f0fdf4;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 4px 16px rgba(15, 23, 42, 0.05);
  --focus: 0 0 0 3px rgba(37, 99, 235, 0.25);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.65rem; line-height: 1.25; margin: 0 0 6px; letter-spacing: -0.01em; }
h2 { font-size: 1.1rem; margin: 28px 0 10px; }
p { margin: 0 0 8px; }
code, .mono { font-family: ui-monospace, "SF Mono", Consolas, monospace; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.error { color: var(--danger); font-size: 0.9rem; margin: 0; }
.ok { color: var(--ok); }
[hidden] { display: none !important; }

/* ===== Layout ===== */
.container { max-width: 720px; margin: 0 auto; padding: 28px 16px 64px; }
.container.wide { max-width: 1200px; }
.topbar { background: var(--card); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 10; }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 12px; padding-bottom: 12px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); font-size: 1rem; }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 9px;
  background: var(--accent); color: #fff; font-size: 16px;
}
.topbar-user { display: flex; align-items: center; gap: 10px; }
.topbar-user form { margin: 0; }
.who { color: var(--muted); font-size: 0.85rem; }

.hero { margin-bottom: 18px; }
.hero p { color: var(--muted); max-width: 560px; }

/* ===== Card ===== */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin: 14px 0;
  box-shadow: var(--shadow);
}

/* ===== Form ===== */
form.card { display: grid; gap: 14px; }
label { display: grid; gap: 6px; font-weight: 600; font-size: 0.88rem; color: var(--text-2); }
label.inline { display: inline-flex; align-items: center; gap: 8px; font-weight: 500; margin-right: 14px; }
input, select, textarea {
  font: inherit;
  font-weight: 400;
  padding: 10px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--text);
  width: 100%;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: var(--focus); }
input[readonly] { background: var(--bg); }
input:disabled, select:disabled { background: var(--bg); color: var(--muted); opacity: 0.6; cursor: not-allowed; }
label.inline input { width: auto; accent-color: var(--accent); }
textarea { min-height: 80px; resize: vertical; }
.field-hint { font-weight: 400; color: var(--muted); font-size: 0.8rem; }

/* ===== Buttons ===== */
button, .button {
  font: inherit;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, transform 0.05s;
}
button:hover, .button:hover { background: var(--accent-hover); text-decoration: none; }
button:active { transform: translateY(1px); }
button:focus-visible, .button:focus-visible { outline: none; box-shadow: var(--focus); }
button:disabled { opacity: 0.65; cursor: progress; }
button.secondary, .button.secondary { background: #fff; color: var(--text-2); border-color: var(--border-strong); }
button.secondary:hover, .button.secondary:hover { background: var(--bg); }
button.danger { background: var(--danger); }
button.danger:hover { background: #b91c1c; }
button.small, .button.small { padding: 5px 11px; font-size: 0.82rem; }
.btn-block { width: 100%; padding: 12px 18px; font-size: 1rem; }

.spinner {
  width: 14px; height: 14px; border-radius: 50%;
  border: 2px solid currentColor; border-right-color: transparent;
  display: none; animation: spin 0.7s linear infinite;
}
.loading .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Kết quả tra cứu (khách) ===== */
.status-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; }
.status-info { display: grid; gap: 4px; }
.status-title { display: flex; align-items: center; gap: 8px; font-weight: 700; }
.status-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.live-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 0 rgba(21, 128, 61, 0.5); animation: pulse 2s infinite; }
.live-dot.off { background: var(--border-strong); animation: none; }
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(21, 128, 61, 0.45); }
  70% { box-shadow: 0 0 0 7px rgba(21, 128, 61, 0); }
  100% { box-shadow: 0 0 0 0 rgba(21, 128, 61, 0); }
}
.badge { display: inline-block; padding: 2px 10px; border-radius: 99px; background: var(--accent-soft); color: var(--accent); font-size: 0.8rem; font-weight: 700; }
.badge-new { display: inline-block; margin-left: 8px; padding: 1px 8px; border-radius: 99px; background: var(--ok-soft); color: var(--ok); font-size: 0.75rem; font-weight: 700; }

.mail-list { display: grid; gap: 10px; margin-top: 14px; }
details.mail { padding: 0; margin: 0; overflow: hidden; }
details.mail > summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; gap: 14px;
  padding: 14px 16px; user-select: none;
}
details.mail > summary::-webkit-details-marker { display: none; }
details.mail > summary:hover { background: #fafbfc; }
details.mail[open] > summary { border-bottom: 1px solid var(--border); }
.mail-main { flex: 1; min-width: 0; }
.mail-subject { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mail-meta { margin-top: 2px; }
.code-chip { display: inline-flex; align-items: center; gap: 8px; background: var(--code-bg); border-radius: var(--radius-sm); padding: 6px 6px 6px 12px; }
.code-chip .code { font: 700 1.35rem/1 ui-monospace, Consolas, monospace; letter-spacing: 0.12em; color: var(--code); }
.chevron { width: 10px; height: 10px; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: rotate(45deg); margin: 0 4px 4px; transition: transform 0.2s; flex: none; }
details[open] .chevron { transform: rotate(225deg); margin-bottom: -4px; }
.mail-body { padding: 14px 16px 16px; background: #fafbfc; }
.mail-frame { width: 100%; height: min(70vh, 640px); border: 1px solid var(--border); border-radius: var(--radius-sm); background: #fff; display: block; }
.mail-text { white-space: pre-wrap; word-break: break-word; margin: 0; font-size: 0.9rem; }
.empty { text-align: center; padding: 32px 18px; }
.empty-icon { font-size: 2rem; margin-bottom: 6px; }

/* OTP ở trang admin */
.otp { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; background: var(--code-bg); border-radius: var(--radius-sm); padding: 12px 14px; margin-bottom: 12px; }
.otp-code { font: 700 1.6rem/1 ui-monospace, Consolas, monospace; letter-spacing: 0.12em; color: var(--code); }

/* ===== Toast ===== */
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  background: var(--text); color: #fff; padding: 10px 16px; border-radius: 10px;
  font-size: 0.9rem; font-weight: 500; box-shadow: 0 8px 24px rgba(15, 23, 42, 0.25);
  z-index: 50; max-width: calc(100% - 32px); animation: toast-in 0.18s ease-out;
}
.toast.error { background: var(--danger); }
.toast.success { background: var(--ok); }
@keyframes toast-in { from { opacity: 0; transform: translate(-50%, 8px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ===== Admin ===== */
nav.admin { display: flex; flex-wrap: wrap; gap: 4px; padding: 4px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 18px; box-shadow: var(--shadow); }
nav.admin a { padding: 8px 14px; border-radius: var(--radius-sm); font-weight: 600; color: var(--text-2); font-size: 0.92rem; }
nav.admin a:hover { background: var(--bg); text-decoration: none; }
nav.admin a.active { background: var(--accent-soft); color: var(--accent); }
.page-title { margin-bottom: 4px; }
.table-wrap { overflow-x: auto; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); margin: 14px 0; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: #fafbfc; }
th { color: var(--muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; white-space: nowrap; background: #fafbfc; }
.tag { display: inline-block; white-space: nowrap; padding: 2px 9px; border-radius: 99px; background: var(--bg); border: 1px solid var(--border); font-size: 0.78rem; font-weight: 600; margin: 1px 4px 1px 0; color: var(--text-2); }
.tag.on { background: var(--ok-soft); border-color: #bbf7d0; color: var(--ok); }
.tag.off { background: var(--danger-soft); border-color: #fecaca; color: var(--danger); }
.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: end; }
.row > * { flex: 1 1 170px; }
.row > button, .row > .button { flex: 0 0 auto; }
.actions { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.actions form { margin: 0; }
.actions form.extend { display: flex; gap: 4px; align-items: center; }
.actions form.extend input { width: 72px; padding: 5px 8px; font-size: 0.85rem; }
.flash { padding: 11px 14px; border-radius: var(--radius-sm); background: var(--ok-soft); border: 1px solid #bbf7d0; color: var(--ok); margin: 12px 0; font-weight: 500; }
.flash.err { background: var(--danger-soft); border-color: #fecaca; color: var(--danger); }
ol.steps { padding-left: 20px; margin: 10px 0 0; }
ol.steps li { margin-bottom: 10px; }
.login-card { max-width: 400px; margin: 40px auto; }

@media (max-width: 560px) {
  h1 { font-size: 1.4rem; }
  .container { padding-top: 20px; }
  details.mail > summary { flex-wrap: wrap; gap: 10px; }
  .mail-main { flex-basis: calc(100% - 40px); }
  .code-chip { order: 3; }
  .status-actions { width: 100%; justify-content: space-between; }
}

/* Bảng mã truy cập: không xuống dòng, cột thao tác gọn trên một hàng */
.nowrap { white-space: nowrap; }
.note-cell { min-width: 140px; max-width: 240px; }
.codes-table td:last-child { width: 1%; }
.codes-table .actions { flex-wrap: nowrap; }
form.card.row.filter-bar { display: flex; margin-top: 0; }
.filter-bar .grow { flex: 3 1 260px; }
.filter-bar > button, .filter-bar > .button { align-self: end; }

/* Trang khách: chỉ nhập mã */
.code-input { font: 600 1.15rem/1.2 ui-monospace, Consolas, monospace; letter-spacing: 0.12em; text-transform: uppercase; }
.code-input::placeholder { letter-spacing: 0.04em; font-weight: 400; text-transform: none; }
.result-email { font-weight: 600; color: var(--text-2); overflow-wrap: anywhere; }

/* Giới hạn nhận mã */
.quota-inputs { display: inline-flex; align-items: center; gap: 6px; font-weight: 400; color: var(--text-2); }
.quota-inputs input { width: 76px; }
.quota-inputs.compact input { width: 58px; padding: 5px 7px; font-size: 0.85rem; }
.quota-inputs.compact { font-size: 0.82rem; }
.quota-cell { min-width: 230px; }
.quota-form { display: flex; align-items: center; gap: 6px; margin: 0; }
.quota-used { display: flex; align-items: center; gap: 8px; margin-top: 6px; }
.quota-used form { margin: 0; }
.link-button { background: none; border: 0; padding: 0; color: var(--accent); font-weight: 600; font-size: 0.82rem; cursor: pointer; }
.link-button:hover { background: none; text-decoration: underline; }
.quota-line { color: var(--text-2); font-weight: 600; }
.quota-line:empty { display: none; }
.mail-locked { display: flex; align-items: center; gap: 14px; padding: 14px 16px; flex-wrap: wrap; }
.mail-locked .mail-subject.wrap { white-space: normal; }
.mail-locked.exhausted { background: #fffbeb; border-color: #fde68a; }
.locked-note { margin: 6px 0 0; color: #92400e; }
.mail-list > .card { margin: 0; }
.quota-inputs, .quota-form { white-space: nowrap; flex-wrap: nowrap; }

/* Trang Mã truy cập: tạo mã thu gọn, bảng gọn, thao tác hàng loạt */
.create-card > summary { cursor: pointer; list-style: none; user-select: none; }
.create-card > summary::-webkit-details-marker { display: none; }
.create-card[open] > summary { margin-bottom: 14px; }
.create-form { display: grid; gap: 12px; }
.filter-chip { font-size: 0.9rem; margin: -4px 0 12px; }
.bulk-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; padding: 10px 14px; position: sticky; top: 62px; z-index: 5; margin-bottom: 10px; }
.bulk-bar.active { border-color: var(--accent); background: var(--accent-soft); }
.bulk-count { font-size: 0.9rem; color: var(--text-2); min-width: 140px; }
.bulk-group { display: inline-flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.num-sm { width: 72px !important; padding: 5px 8px; font-size: 0.85rem; }
.codes-table th.check, .codes-table td.check { width: 36px; padding-right: 0; }
.codes-table input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }
.codes-table tr.selected td { background: var(--accent-soft); }
.code-link { color: var(--text); }
.info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px 20px; }
.info-grid .span-all { grid-column: 1 / -1; }
.code-actions { gap: 10px 14px; }
.code-actions form { display: inline-flex; align-items: center; gap: 6px; }

/* Phân trang */
.pagination { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 12px; margin: 10px 0; }
.pagination .pages { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 4px; }
.pagination .button.current { cursor: default; }
.pagination .button.disabled { opacity: 0.45; pointer-events: none; }

/* Mẫu tin nhắn gửi khách */
.share-editor { display: grid; gap: 8px; }
.share-editor textarea { min-height: 120px; font-family: inherit; }
.var-chip { background: var(--accent-soft); color: var(--accent); border: 1px solid #bfdbfe; padding: 2px 8px; font: 600 0.8rem ui-monospace, Consolas, monospace; border-radius: 6px; margin: 2px 0; }
.var-chip:hover { background: #dbeafe; }
.share-preview { white-space: pre-wrap; word-break: break-word; margin: 4px 0 0; padding: 12px 14px; background: var(--bg); border: 1px dashed var(--border-strong); border-radius: var(--radius-sm); font-family: inherit; font-size: 0.9rem; line-height: 1.55; }

/* Trang khách: hướng dẫn nhanh cách lấy mã */
.guide { background: var(--accent-soft); border-color: #bfdbfe; }
.guide-title { display: block; font-size: 1.05rem; margin-bottom: 10px; }


/* Hướng dẫn: hiện đúng từng dòng admin gõ */
.guide-lines { display: grid; gap: 6px; line-height: 1.55; overflow-wrap: anywhere; }
.guide-line.blank { height: 4px; }