/* ==========================================================================
   Trang quản trị Key for Aptis — CSS RIÊNG, không dùng chung với web chính.
   (public/css/style.css của web chính đã ~1100 dòng; nhồi thêm là không ai đọc nổi.)

   ⚠️ LUẬT BẮT BUỘC — đọc trước khi thêm selector mới:
   Selector nào set `display` mà phần tử đó dùng thuộc tính `hidden` thì PHẢI kèm
   rule `[hidden] { display: none }`. CSS của tác giả luôn thắng stylesheet mặc định
   của trình duyệt, nên `display: ...` sẽ ĐÈ MẤT `[hidden]` -> phần tử tưởng là ẩn
   vẫn hiện; nếu nó `position: fixed` thì che kín màn hình và nuốt sạch click cả trang.
   Đã xảy ra thật ở web chính với `.ovl`. Tiền lệ đúng: `.modal-overlay[hidden]`,
   `.vocab-popup[hidden]`, `.ovl[hidden]` trong public/css/style.css.
   ========================================================================== */

:root {
  --navy: #1E3A8A;
  --navy-700: #172e6e;
  --navy-900: #0f1f4d;
  --emerald: #10B981;
  --emerald-600: #0ea371;
  --orange: #F97316;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-400: #9CA3AF;
  --gray-600: #4B5563;
  --gray-800: #1F2937;
  --white: #fff;
  --red: #DC2626;
  --radius: 12px;
  --font: 'Segoe UI', Roboto, system-ui, -apple-system, Arial, sans-serif;
  --side-w: 240px;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: var(--font); background: var(--gray-50); color: var(--gray-800); }
a { color: inherit; }

/* ===== Bố cục ===== */
.adm { display: flex; min-height: 100vh; }

/* ===== Sidebar ===== */
.adm-side {
  width: var(--side-w); flex-shrink: 0; background: var(--navy-900); color: #fff;
  display: flex; flex-direction: column; padding: 18px 14px;
  position: sticky; top: 0; height: 100vh;
}
.adm-brand { display: flex; align-items: center; gap: 9px; text-decoration: none; }
.adm-brand-text { font-size: 16px; font-weight: 800; }
/* Nền tối -> chữ "Aptis" (vốn navy đậm) phải đổi sang trắng, không thì mất hút. */
.adm-brand-text .brand-key { color: var(--emerald); }
.adm-brand-text .brand-for { color: var(--orange); }
.adm-brand-text .brand-aptis { color: #fff; }
.adm-badge {
  display: inline-block; margin: 10px 0 18px; padding: 2px 9px; border-radius: 999px;
  font-size: 11px; font-weight: 800; letter-spacing: .04em; text-transform: uppercase;
  background: rgba(249, 115, 22, .2); color: #FDBA74; align-self: flex-start;
}
.adm-nav { display: flex; flex-direction: column; gap: 2px; }
.adm-nav-link {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 9px;
  text-decoration: none; color: rgba(255, 255, 255, .72); font-size: 14px; font-weight: 600;
  transition: background .12s ease, color .12s ease;
}
.adm-nav-link:hover { background: rgba(255, 255, 255, .07); color: #fff; }
.adm-nav-link.is-active { background: var(--emerald); color: #fff; }
.adm-nav-icon { font-size: 16px; line-height: 1; }
.adm-nav-soon {
  margin-left: auto; font-size: 10px; font-weight: 700; padding: 2px 6px; border-radius: 999px;
  background: rgba(255, 255, 255, .12); color: rgba(255, 255, 255, .6);
}
.adm-nav-link.is-active .adm-nav-soon { background: rgba(0, 0, 0, .18); color: rgba(255, 255, 255, .85); }
.adm-side-foot { margin-top: auto; padding-top: 16px; border-top: 1px solid rgba(255, 255, 255, .1); }
.adm-side-back { font-size: 13px; color: rgba(255, 255, 255, .6); text-decoration: none; }
.adm-side-back:hover { color: #fff; }

/* ===== Vùng chính ===== */
.adm-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.adm-top {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 16px 26px; background: #fff; border-bottom: 1px solid var(--gray-200);
}
.adm-top-title { margin: 0; font-size: 20px; color: var(--navy); }
.adm-top-right { display: flex; align-items: center; gap: 14px; }
.adm-who { font-size: 13px; color: var(--gray-600); }
.adm-logout {
  font-size: 13px; font-weight: 700; color: var(--red); text-decoration: none;
  padding: 6px 12px; border-radius: 8px; border: 1px solid var(--gray-200);
}
.adm-logout:hover { background: #FEF2F2; border-color: #FECACA; }
.adm-content { flex: 1; padding: 26px; }
.adm-foot { padding: 14px 26px; font-size: 12px; color: var(--gray-400); }

/* ===== Khối nội dung ===== */
.adm-sec { margin-bottom: 30px; }
.adm-sec-title { margin: 0 0 14px; font-size: 15px; color: var(--gray-600); text-transform: uppercase; letter-spacing: .04em; }
.adm-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; }
.adm-card {
  background: #fff; border: 1px solid var(--gray-200); border-left: 4px solid var(--gray-200);
  border-radius: var(--radius); padding: 18px; display: flex; flex-direction: column; gap: 6px;
}
.adm-card.is-good { border-left-color: var(--emerald); }
.adm-card.is-warn { border-left-color: var(--orange); }
.adm-card.is-accent { border-left-color: var(--navy); }
.adm-card-label { font-size: 12.5px; color: var(--gray-600); font-weight: 600; }
.adm-card-value { font-size: 27px; font-weight: 800; color: var(--navy); line-height: 1.15; }
.adm-card-value small { font-size: 15px; font-weight: 700; color: var(--gray-400); }

/* ===== Bảng ===== */
/* Bảng rộng phải tự cuộn TRONG khung, không được làm cả trang trượt ngang. */
.adm-table-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius); }
.adm-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.adm-table th, .adm-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--gray-100); }
.adm-table th { font-size: 12px; text-transform: uppercase; letter-spacing: .03em; color: var(--gray-600); background: var(--gray-50); }
.adm-table tr:last-child td { border-bottom: 0; }
.adm-num { text-align: right; font-variant-numeric: tabular-nums; }
.adm-muted { color: var(--gray-400); font-size: 13px; }
.adm-note { margin: 10px 2px 0; font-size: 12.5px; color: var(--gray-400); }

/* ===== Khối thông tin ===== */
.adm-info { background: #fff; border: 1px dashed var(--gray-200); border-radius: var(--radius); padding: 20px 22px; }
.adm-info h3 { margin: 0 0 8px; font-size: 15px; color: var(--navy); }
.adm-info p { margin: 0 0 8px; font-size: 13.5px; line-height: 1.65; color: var(--gray-600); }
.adm-info p:last-child { margin-bottom: 0; }

/* ===== Nút / form ===== */
.adm-btn {
  display: inline-block; padding: 11px 20px; border: 0; border-radius: 9px; cursor: pointer;
  background: var(--orange); color: #fff; font-size: 14px; font-weight: 700; font-family: var(--font);
  text-decoration: none; text-align: center;
}
.adm-btn:hover { background: #ea6a0c; }
.adm-btn-ghost { background: transparent; color: var(--gray-600); border: 1px solid var(--gray-200); }
.adm-btn-ghost:hover { background: var(--gray-100); color: var(--gray-800); }
.adm-form { display: flex; flex-direction: column; }
.adm-label { font-size: 13px; font-weight: 700; color: var(--gray-600); margin-bottom: 6px; }
.adm-input {
  padding: 11px 13px; border: 1px solid var(--gray-200); border-radius: 9px;
  font-size: 14px; font-family: var(--font); margin-bottom: 16px; background: #fff;
}
.adm-input:focus { outline: 2px solid var(--emerald); outline-offset: -1px; border-color: transparent; }
.adm-alert {
  background: #FEF2F2; border: 1px solid #FECACA; color: #991B1B;
  padding: 11px 14px; border-radius: 9px; font-size: 13.5px; margin-bottom: 16px;
}

/* ===== Layout blank (đăng nhập / trang lỗi) ===== */
.adm-blank { background: var(--navy-900); }
.adm-blank-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; }
.adm-login, .adm-msg {
  width: 100%; max-width: 400px; background: #fff; border-radius: 16px;
  padding: 34px 30px; box-shadow: 0 18px 50px rgba(0, 0, 0, .3);
}
.adm-login-head { display: flex; flex-direction: column; align-items: center; margin-bottom: 22px; }
.adm-login-brand { font-size: 20px; font-weight: 800; margin-top: 8px; }
.adm-login-note { margin: 16px 0 0; font-size: 12px; color: var(--gray-400); text-align: center; }
.adm-msg { text-align: center; }
.adm-msg-code { font-size: 44px; font-weight: 800; color: var(--gray-200); line-height: 1; margin-bottom: 6px; }
.adm-msg h2 { margin: 0 0 8px; font-size: 19px; color: var(--navy); }
.adm-msg-text { margin: 0 0 20px; font-size: 14px; color: var(--gray-600); }

/* ===== Trang đang xây dựng ===== */
.adm-soon {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 56px 24px; text-align: center;
}
.adm-soon-icon { font-size: 42px; margin-bottom: 12px; }
.adm-soon h2 { margin: 0 0 8px; font-size: 19px; color: var(--navy); }
.adm-soon-note { margin: 0 auto 22px; font-size: 13.5px; color: var(--gray-600); max-width: 460px; line-height: 1.6; }

/* ===== Mobile ===== */
@media (max-width: 820px) {
  .adm { flex-direction: column; }
  .adm-side { width: 100%; height: auto; position: static; padding: 14px; }
  .adm-nav { flex-direction: row; flex-wrap: wrap; }
  .adm-nav-soon { display: none; }
  .adm-side-foot { margin-top: 14px; }
  .adm-content, .adm-top { padding: 16px; }
}

/* ==========================================================================
   Trang Người dùng
   ========================================================================== */

/* ===== Thông báo kết quả thao tác ===== */
.adm-flash { padding: 12px 16px; border-radius: 9px; font-size: 13.5px; margin-bottom: 16px; }
.adm-flash.is-ok { background: #ECFDF5; border: 1px solid #A7F3D0; color: #065F46; }
.adm-flash.is-err { background: #FEF2F2; border: 1px solid #FECACA; color: #991B1B; }

/* ===== Tìm kiếm + lọc ===== */
.adm-filter { display: flex; gap: 8px; margin-bottom: 14px; }
.adm-filter-input { margin-bottom: 0; flex: 1; max-width: 380px; }
.adm-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.adm-tab {
  padding: 6px 13px; border-radius: 999px; font-size: 13px; font-weight: 600;
  text-decoration: none; color: var(--gray-600); background: #fff; border: 1px solid var(--gray-200);
}
.adm-tab:hover { border-color: var(--gray-400); }
.adm-tab.is-active { background: var(--navy); border-color: var(--navy); color: #fff; }
.adm-count { margin: 0 0 12px; font-size: 13px; color: var(--gray-600); }
.adm-empty {
  background: #fff; border: 1px dashed var(--gray-200); border-radius: var(--radius);
  padding: 40px; text-align: center; color: var(--gray-400); font-size: 14px;
}

/* ===== Nhãn trạng thái ===== */
.adm-pill {
  display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 11px;
  font-weight: 700; background: var(--gray-100); color: var(--gray-600); white-space: nowrap;
}
.adm-pill.is-ok { background: #D1FAE5; color: #065F46; }
.adm-pill.is-warn { background: #FEF3C7; color: #92400E; }
.adm-pill.is-err { background: #FEE2E2; color: #991B1B; }
.adm-pill.is-admin { background: #DBEAFE; color: #1E3A8A; }

.adm-link { color: var(--navy); font-weight: 600; text-decoration: none; }
.adm-link:hover { text-decoration: underline; }
.adm-back { display: inline-block; margin-bottom: 14px; font-size: 13px; color: var(--gray-600); text-decoration: none; }
.adm-back:hover { color: var(--navy); }

.adm-btn-sm { padding: 6px 12px; font-size: 12.5px; }
.adm-btn-block { width: 100%; }
.adm-pager { display: flex; align-items: center; justify-content: center; gap: 14px; margin-top: 16px; font-size: 13px; }

/* ===== Chi tiết ===== */
/* Cột phụ 320px cho khu thao tác; hẹp màn thì xếp dọc (xem media query cuối file). */
.adm-cols { display: grid; grid-template-columns: 1fr 320px; gap: 18px; align-items: start; }
.adm-panel {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 18px 20px; margin-bottom: 16px;
}
.adm-panel-title { margin: 0 0 14px; font-size: 14px; color: var(--navy); }
.adm-dl { display: grid; grid-template-columns: 150px 1fr; gap: 9px 12px; margin: 0; font-size: 13.5px; }
.adm-dl dt { color: var(--gray-600); font-weight: 600; }
.adm-dl dd { margin: 0; }
.adm-code {
  font-family: ui-monospace, 'Cascadia Code', Consolas, monospace; font-size: 12.5px;
  background: var(--gray-100); padding: 2px 6px; border-radius: 5px;
}
.adm-hint { margin: 0 0 12px; font-size: 12.5px; color: var(--gray-600); line-height: 1.6; }
.adm-hint:last-child { margin-bottom: 0; margin-top: 10px; }
.adm-inline-form { display: flex; gap: 8px; }
.adm-input-sm { margin-bottom: 0; width: 90px; }
.adm-stack { margin-bottom: 8px; }

@media (max-width: 1080px) {
  .adm-cols { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .adm-dl { grid-template-columns: 1fr; gap: 2px 0; }
  .adm-dl dd { margin-bottom: 8px; }
  .adm-filter { flex-wrap: wrap; }
  .adm-filter-input { max-width: none; }
}

/* ===== Tài khoản trả phí (VIP) ===== */
.adm-pill.is-vip { background: linear-gradient(135deg, #FDE68A, #FBBF24); color: #7C2D12; }
.adm-card.is-vip { border-left-color: #F59E0B; }