/* ============================================================
   Sổ liên lạc điện tử - Nguyễn Bỉnh Khiêm
   Giao diện mô phỏng theme Metronic (như cổng SV FPT Polytechnic)
   Sidebar sáng · màu chàm #5d78ff · font Poppins · subheader
   ============================================================ */
:root{
  --primary:#105FAD; --primary-hover:#0c4a87; --primary-soft:#e8f1fb;
  --success:#0abb87; --danger:#fd397a; --warning:#ffb822;
  --ink:#48465b; --menu:#6c7293; --muted:#a2a5b9; --line:#ebedf3;
  --bg:#f2f3f8; --white:#fff; --sidebar-w:265px; --topbar-h:65px;
  --r:6px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Poppins','Montserrat',system-ui,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.5;font-size:14px}
a{color:var(--primary);text-decoration:none}
img{max-width:100%}

/* ---------- Nút ---------- */
.btn{display:inline-flex;align-items:center;gap:7px;justify-content:center;border:0;border-radius:var(--r);padding:9px 16px;font-family:inherit;font-weight:600;font-size:13.5px;cursor:pointer;transition:.2s;background:var(--primary);color:#fff}
.btn:hover{background:var(--primary-hover)}
.btn.sm{padding:6px 11px;font-size:12.5px}
.btn.ghost{background:#fff;color:var(--primary);border:1px solid var(--primary)}
.btn.ghost:hover{background:var(--primary);color:#fff}
.btn.danger{background:var(--danger)}.btn.danger:hover{filter:brightness(.92)}
.btn.gray{background:#f0f1f7;color:#6c7293}.btn.gray:hover{background:#e6e8f2}
.btn.block{width:100%}

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

/* Sidebar sáng (light skin) */
.sidebar{width:var(--sidebar-w);flex-shrink:0;background:var(--white);display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100;box-shadow:0 0 28px 0 rgba(82,63,105,.08)}
.sidebar__brand{display:flex;align-items:center;gap:10px;height:var(--topbar-h);flex-shrink:0;padding:0 20px;border-bottom:1px solid var(--line)}
.sidebar__brand img{height:40px;width:40px;border-radius:8px;flex-shrink:0}
.sidebar__brand small{display:block;font-size:10px;color:var(--muted);font-weight:500}
.sidebar__brand strong{font-size:13.5px;color:var(--ink);text-transform:uppercase;line-height:1.1}
.menu{flex:1;overflow-y:auto;padding:16px 16px;display:flex;flex-direction:column;gap:2px}
.menu__label{font-size:11px;text-transform:uppercase;letter-spacing:.4px;color:var(--muted);font-weight:600;padding:14px 12px 8px}
.menu button, .menu a.mi{display:flex;align-items:center;gap:12px;width:100%;border:0;background:transparent;color:var(--menu);font-family:inherit;font-weight:500;font-size:14px;padding:11px 12px;border-radius:var(--r);cursor:pointer;text-align:left;transition:.15s}
.menu button:hover, .menu a.mi:hover{background:#f8f8fb;color:var(--primary)}
.menu button:hover svg, .menu a.mi:hover svg{fill:var(--primary)}
.menu button.active{background:#f8f8fb;color:var(--primary);font-weight:600}
.menu button.active svg{fill:var(--primary)}
.menu svg{width:20px;height:20px;flex-shrink:0;fill:#c9cde4;transition:.15s}
.menu .mi-ic{width:21px;height:21px;object-fit:contain;flex-shrink:0;opacity:.45;transition:.15s}
.menu button:hover .mi-ic,.menu button.active .mi-ic{opacity:1}
.sidebar__footer{padding:14px 16px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:8px}

/* Vùng chính */
.main{flex:1;min-width:0;margin-left:var(--sidebar-w);display:flex;flex-direction:column}

/* Header trắng cố định */
.topbar{height:var(--topbar-h);background:var(--white);display:flex;align-items:center;gap:14px;padding:0 25px;position:sticky;top:0;z-index:40;box-shadow:0 3px 12px 0 rgba(82,63,105,.06)}
.topbar__spacer{flex:1}
.user-chip{display:flex;align-items:center;gap:10px}
.user-chip .u{font-size:13px;line-height:1.2;text-align:right}
.user-chip .u b{display:block;font-size:13px;color:var(--ink);font-weight:600}
.user-chip .u small{color:var(--muted);font-size:11.5px}
.user-chip .av{width:38px;height:38px;border-radius:6px;background:var(--primary-soft);color:var(--primary);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px}
.menu-toggle{display:none;border:0;background:transparent;cursor:pointer;padding:6px}
.menu-toggle svg{width:26px;height:26px;fill:var(--menu)}

/* Subheader (thanh tiêu đề dưới header) */
.subheader{background:var(--white);padding:16px 25px;display:flex;align-items:center;gap:14px;box-shadow:0 3px 12px 0 rgba(82,63,105,.04);border-top:1px solid #f4f5f9}
.subheader h1{font-size:19px;font-weight:600;color:var(--ink);margin:0}
.subheader .crumb{font-size:12.5px;color:var(--muted);display:flex;align-items:center;gap:7px}
.subheader .crumb::before{content:'';width:5px;height:5px;border-radius:50%;background:#c9cde4}

.content{padding:25px;flex:1}

/* Portlet / card */
.card{background:#fff;border-radius:var(--r);box-shadow:0 0 13px 0 rgba(82,63,105,.06);padding:22px 25px;margin-bottom:20px}
.card h2{font-size:15px;color:var(--ink);font-weight:600;margin-bottom:16px;padding-bottom:14px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:8px}
.card h2 .sub{font-size:12.5px;font-weight:400;color:var(--muted)}

/* Form */
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:flex-end}
.field{display:flex;flex-direction:column;gap:6px;flex:1;min-width:150px}
.field label{font-size:12.5px;font-weight:500;color:var(--menu)}
.field input,.field select,.field textarea{font-family:inherit;font-size:13.5px;padding:9px 12px;border:1px solid var(--line);border-radius:var(--r);background:#fff;color:var(--ink);outline:none;transition:.15s}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--primary)}
/* Ô tick "Ghim tin quan trọng" */
.pin-check{display:inline-flex;align-items:center;gap:9px;margin-top:12px;font-size:13.5px;color:var(--menu);font-weight:500;cursor:pointer;user-select:none}
.pin-check input{width:17px;height:17px;margin:0;flex-shrink:0;accent-color:var(--primary);cursor:pointer}
.pin-check span{line-height:1.2}

/* Bảng */
table{width:100%;border-collapse:collapse;font-size:13.5px}
th,td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line)}
th{color:var(--muted);font-size:11.5px;font-weight:600;text-transform:uppercase;letter-spacing:.3px}
tr:hover td{background:#f9f9fc}
.table-wrap{overflow-x:auto}
.badge{display:inline-block;background:var(--primary-soft);color:var(--primary);border-radius:4px;padding:3px 10px;font-size:12px;font-weight:600}
.muted{color:var(--muted)}
.empty{text-align:center;color:var(--muted);padding:26px;font-style:italic}

/* Thời khóa biểu */
.tkb{overflow-x:auto}
.tkb table td{vertical-align:top}
.tkb .subj{font-weight:600;color:var(--ink)}
.tkb .room{font-size:12px;color:var(--muted)}

/* Thông tin học sinh */
.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.info-item{background:#f7f8fa;border-radius:var(--r);padding:11px 14px}
.info-item .k{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.3px;font-weight:600}
.info-item .v{font-size:15px;font-weight:600;color:var(--ink);margin-top:3px}

/* Điểm theo môn */
.subj-block{border:1px solid var(--line);border-radius:var(--r);margin-bottom:14px;overflow:hidden}
.subj-head{display:flex;align-items:center;gap:10px;background:#f7f8fa;padding:12px 15px}
.subj-head .name{font-weight:600;color:var(--ink);font-size:14.5px}
.subj-head .avg{margin-left:auto;font-size:13px;font-weight:600;color:#fff;background:var(--success);border-radius:4px;padding:3px 12px}
.subj-head .avg.none{color:var(--menu);background:#eef0f5}
.subj-block table{font-size:13px}
.overall{display:flex;align-items:center;gap:12px;background:linear-gradient(135deg,#0c4a87,#105FAD);color:#fff;border-radius:var(--r);padding:16px 20px;margin-bottom:16px}
.overall .lbl{font-weight:500;font-size:14px;opacity:.95}
.overall .rank{background:rgba(255,255,255,.22);border-radius:20px;padding:4px 14px;font-size:13px;font-weight:600}
.overall .num{margin-left:auto;font-size:26px;font-weight:700}
.hint{font-size:12.5px;color:var(--muted);margin-top:2px}

/* Dashboard tổng quan */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:18px;margin-bottom:20px}
.stat{background:#fff;border-radius:var(--r);box-shadow:0 0 13px 0 rgba(82,63,105,.06);padding:20px 22px;display:flex;align-items:center;gap:16px}
.stat__icon{width:52px;height:52px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.stat__icon svg{width:26px;height:26px;fill:#fff}
.stat__num{font-size:28px;font-weight:700;color:var(--ink);line-height:1}
.stat__label{font-size:13px;color:var(--muted);margin-top:4px}
.ic-blue{background:linear-gradient(135deg,#5d78ff,#3d5afe)}
.ic-green{background:linear-gradient(135deg,#0abb87,#08a376)}
.ic-orange{background:linear-gradient(135deg,#ffb822,#f89b1c)}
.ic-pink{background:linear-gradient(135deg,#fd397a,#e01e63)}
.welcome{background:linear-gradient(135deg,#3d5afe,#5d78ff);color:#fff;border-radius:var(--r);padding:22px 26px;margin-bottom:20px}
.welcome h2{border:0;color:#fff;margin:0 0 4px;font-size:19px;padding:0}
.welcome p{opacity:.92;font-size:14px}

/* Bảng thông báo nhiều cột (kiểu cổng FPT) */
.ann-board{display:grid;grid-template-columns:repeat(4,1fr)}
.ann-col{padding:0 20px;border-right:1px solid var(--line)}
.ann-col:first-child{padding-left:0}
.ann-col:last-child{border-right:0;padding-right:0}
.ann-col__head{color:var(--primary);font-weight:700;font-size:16px;margin-bottom:6px;padding-bottom:12px}
.ann-item{padding:12px 0;border-bottom:1px solid var(--line)}
.ann-item:last-child{border-bottom:0}
.ann-item__title{font-size:13.5px;color:#42597a;cursor:pointer;font-weight:500;line-height:1.5}
.ann-item__title:hover{color:var(--primary)}
.ann-item.pinned .ann-item__title{color:var(--danger);font-weight:700;text-transform:uppercase;font-size:13px}
.ann-item__content{margin-top:8px;font-size:13px;color:#5c5a6e;white-space:pre-line;background:#f7f8fa;padding:10px 12px;border-radius:var(--r)}
.ann-item__meta{margin-top:7px;font-size:11.5px;color:var(--muted)}
.ann-del{color:var(--danger);font-weight:600}
.ann-more{margin-top:14px;background:var(--primary);color:#fff;border:0;border-radius:var(--r);padding:8px 18px;font-family:inherit;font-weight:600;font-size:13px;cursor:pointer}
.ann-more:hover{background:var(--primary-hover)}
.ann-empty{color:var(--muted);font-style:italic;font-size:13px;padding:12px 0}
@media(max-width:900px){.ann-board{grid-template-columns:repeat(2,1fr)}.ann-col{border-right:0;border-bottom:1px solid var(--line);padding:14px 0!important}}
@media(max-width:560px){.ann-board{grid-template-columns:1fr}}

/* Footer thông tin liên hệ */
.app-footer{margin-top:24px;background:#fff;border-radius:var(--r);box-shadow:0 0 13px 0 rgba(82,63,105,.06);padding:26px 28px;display:grid;grid-template-columns:1.1fr 1fr 1.5fr;gap:26px;align-items:start}
.ft-brand{display:flex;align-items:center;gap:13px}
.ft-brand img{height:56px;width:56px}
.ft-brand__txt strong{display:block;color:var(--ink);font-size:13px;font-weight:600}
.ft-brand__txt span{color:var(--primary);font-weight:700;font-size:17px}
.ft-block h4{color:var(--ink);font-size:14px;font-weight:600;margin-bottom:13px}
.ft-line{display:flex;align-items:flex-start;gap:9px;font-size:13px;color:var(--menu);margin-bottom:10px;line-height:1.5}
.ft-line svg{width:17px;height:17px;fill:var(--primary);flex-shrink:0;margin-top:2px}
.ft-line b{color:var(--ink)}
@media(max-width:800px){.app-footer{grid-template-columns:1fr;gap:18px}}

/* Thanh loading trên đỉnh */
#nbk-loadbar{position:fixed;top:0;left:0;height:3px;width:0;background:var(--primary);z-index:9999;transition:width .3s;opacity:0}
#nbk-loadbar.on{width:85%;opacity:1;transition:width 8s cubic-bezier(.1,.7,.1,1)}

/* Toast */
#nbk-toasts{position:fixed;top:16px;right:16px;z-index:9998;display:flex;flex-direction:column;gap:10px;max-width:340px}
.nbk-toast{background:#fff;border-radius:var(--r);box-shadow:0 8px 30px rgba(72,70,91,.22);padding:13px 16px;font-size:13.5px;font-weight:500;border-left:4px solid var(--primary);opacity:0;transform:translateX(20px);transition:.28s;white-space:pre-line}
.nbk-toast.show{opacity:1;transform:none}
.nbk-toast.ok{border-left-color:var(--success);color:#0a8f68}
.nbk-toast.err{border-left-color:var(--danger);color:#c62368}
.nbk-toast.info{border-left-color:var(--primary);color:var(--ink)}

/* Hộp thoại xác nhận */
.nbk-modal{position:fixed;inset:0;background:rgba(72,70,91,.5);z-index:9997;display:flex;align-items:center;justify-content:center;padding:20px;opacity:0;transition:.2s}
.nbk-modal.show{opacity:1}
.nbk-modal__box{background:#fff;border-radius:12px;box-shadow:0 24px 60px rgba(0,0,0,.3);padding:24px;max-width:400px;width:100%;transform:scale(.95);transition:.2s}
.nbk-modal.show .nbk-modal__box{transform:scale(1)}
.nbk-modal__msg{font-size:14.5px;color:var(--ink);line-height:1.55;margin-bottom:20px;white-space:pre-line}
.nbk-modal__btns{display:flex;gap:10px;justify-content:flex-end}

/* Lớp phủ mobile */
.overlay{display:none;position:fixed;inset:0;background:rgba(72,70,91,.4);z-index:90}

/* Responsive */
@media(max-width:900px){
  .sidebar{transform:translateX(-100%);transition:transform .25s}
  body.nav-open .sidebar{transform:translateX(0)}
  body.nav-open .overlay{display:block}
  .main{margin-left:0}
  .menu-toggle{display:inline-flex}
}
@media(max-width:560px){
  .content,.subheader,.topbar{padding-left:15px;padding-right:15px}
  .card{padding:16px}
  .user-chip .u{display:none}
}

/* ============================================================
   Trang đăng nhập
   ============================================================ */
.login-wrap{position:relative;overflow:hidden;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;
  background:radial-gradient(120% 120% at 50% 0%,#2f7bc4 0%,#105FAD 45%,#0c4a87 100%)}
/* Mascot hai bên thẻ đăng nhập */
.mascot{position:absolute;top:50%;z-index:1;height:clamp(300px,52vh,400px);width:auto;pointer-events:none;
  filter:drop-shadow(0 16px 22px rgba(4,32,64,.28))}
.mascot-l{left:50%;transform:translate(calc(-185px - 100%),-30%)}
.mascot-r{left:50%;transform:translate(185px,-30%)}
.login-card{position:relative;z-index:2;width:100%;max-width:460px;background:#fff;border-radius:16px;box-shadow:0 24px 60px rgba(0,0,0,.28);padding:30px 30px}
.login-card .logo{text-align:center;margin-bottom:8px}
.login-card .logo img{width:64px;height:64px;object-fit:contain}
.login-card h1{text-align:center;font-size:24px;color:#0c3f73;margin:4px 0 2px;font-weight:800;letter-spacing:0}
.login-card .sub{text-align:center;color:var(--muted);font-size:14px;margin-bottom:22px}
.seg{display:flex;background:#f2f3f8;border-radius:8px;padding:4px;margin-bottom:18px}
.seg button{flex:1;border:0;background:transparent;font-family:inherit;font-weight:600;font-size:13.5px;color:var(--menu);padding:9px;border-radius:6px;cursor:pointer}
.seg button.active{background:#fff;color:var(--primary);box-shadow:0 2px 6px rgba(0,0,0,.08)}
.login-card .field{margin-bottom:14px}
.msg{font-size:13px;padding:9px 12px;border-radius:6px;margin-bottom:14px;display:none}
.msg.err{display:block;background:#fff0f4;color:#d81b60;border:1px solid #fbd0dd}
.msg.ok{display:block;background:#e9f9f3;color:#0a8f68;border:1px solid #bfe8d9}
.back-home{display:block;text-align:center;margin-top:16px;font-size:13px;color:var(--muted)}
/* Không đủ chỗ cho mascot hai bên -> ẩn đi */
@media(max-width:1040px){.mascot{display:none}}