/* =====================================================================
   Bổ sung cho trang công khai: modal đăng ký, mục học liệu mẫu, thông báo.
   Dùng lại toàn bộ biến màu/bo góc đã có trong index.html — không đổi
   một pixel nào của thiết kế gốc.
   ===================================================================== */

/* ---------- MODAL ---------- */
.mdl{position:fixed;inset:0;z-index:200;display:none;align-items:flex-start;justify-content:center;padding:24px;overflow-y:auto}
.mdl.open{display:flex}
.mdl-bg{position:fixed;inset:0;background:rgba(16,24,40,.55);backdrop-filter:blur(3px)}
.mdl-box{position:relative;background:#fff;border-radius:16px;box-shadow:var(--shadow-lg);width:100%;max-width:620px;margin:auto;animation:mdlIn .22s ease}
@keyframes mdlIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.mdl-head{padding:26px 28px 18px;border-bottom:1px solid var(--line);position:relative}
.mdl-head h3{font-size:22px;margin-bottom:6px}
.mdl-head p{font-size:14.5px;color:var(--muted)}
.mdl-x{position:absolute;top:18px;right:18px;width:34px;height:34px;border:0;border-radius:50%;background:var(--bg-soft);color:var(--body);font-size:19px;line-height:1;cursor:pointer;font-family:inherit}
.mdl-x:hover{background:var(--line)}
.mdl-body{padding:24px 28px 28px}

/* ---------- FORM ---------- */
.frm{display:grid;gap:15px}
.frm .two{display:grid;grid-template-columns:1fr 1fr;gap:15px}
.fld label{display:block;font-size:13px;font-weight:600;color:var(--ink);margin-bottom:6px}
.fld label .req{color:var(--red)}
.fld input,.fld select,.fld textarea{width:100%;border:1.5px solid var(--line);border-radius:10px;padding:11px 13px;font-size:14.5px;font-family:inherit;color:var(--ink);background:#fff;transition:.15s}
.fld textarea{min-height:78px;resize:vertical}
.fld input:focus,.fld select:focus,.fld textarea:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,156,166,.13)}
.fld.err input,.fld.err select{border-color:var(--red)}
.fld .msg{display:none;font-size:12.5px;color:var(--red);margin-top:5px}
.fld.err .msg{display:block}
.hp{position:absolute!important;left:-9999px;opacity:0;height:0;width:0}
.chk{display:flex;gap:10px;align-items:flex-start;font-size:13.5px;color:var(--body);line-height:1.5}
.chk input{width:17px;height:17px;margin-top:2px;flex-shrink:0;accent-color:var(--accent)}
.chk a{color:var(--accent);font-weight:600;text-decoration:underline}
.frm-err{display:none;background:#FEF2F2;border:1px solid #FECACA;color:#B42318;border-radius:10px;padding:11px 14px;font-size:13.5px}
.frm-err.on{display:block}
.btn[disabled]{opacity:.6;cursor:not-allowed;transform:none!important}
.spin{width:15px;height:15px;border:2px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:sp .7s linear infinite;display:inline-block}
@keyframes sp{to{transform:rotate(360deg)}}

/* ---------- MÀN HÌNH CẢM ƠN ---------- */
.done{text-align:center;padding:14px 4px 8px}
.done .ic{width:66px;height:66px;border-radius:50%;background:var(--bg-tint);color:var(--accent);display:grid;place-items:center;font-size:31px;margin:0 auto 18px}
.done h3{font-size:21px;margin-bottom:10px}
.done p{font-size:15px;color:var(--muted);margin-bottom:20px;max-width:420px;margin-left:auto;margin-right:auto}
.done .dl{display:inline-flex;margin-bottom:14px}

/* ---------- HỌC LIỆU MẪU ---------- */
.mats{display:grid;gap:12px}
.mat{display:flex;align-items:center;gap:15px;border:1px solid var(--line);border-radius:12px;padding:15px 18px;background:#fff;transition:.16s}
.mat:hover{border-color:#C9D8EA;box-shadow:var(--shadow)}
.mat .ft{width:44px;height:44px;border-radius:10px;display:grid;place-items:center;font-size:12px;font-weight:800;letter-spacing:.02em;color:#fff;flex-shrink:0;background:var(--navy-2)}
.ft.pdf{background:#D93025}.ft.doc{background:#2B579A}.ft.ppt{background:#D24726}
.ft.xls{background:#217346}.ft.zip{background:#6B7280}.ft.link{background:var(--accent)}
.mat .info{flex:1;min-width:0}
.mat .info h4{font-size:15.5px;margin-bottom:3px}
.mat .info p{font-size:13.5px;color:var(--muted);margin:0}
.mat .info .sub{font-size:12px;color:var(--muted);margin-top:5px;display:flex;gap:12px;flex-wrap:wrap}
.mat .lock{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;background:#FEF3C7;color:#92400E;padding:3px 9px;border-radius:5px}
.mat .get{border:1.5px solid var(--line);background:#fff;color:var(--navy);border-radius:99px;padding:9px 18px;font-size:13.5px;font-weight:600;cursor:pointer;font-family:inherit;flex-shrink:0;transition:.16s}
.mat .get:hover{border-color:var(--accent);color:var(--accent)}
.mats-empty{border:1px dashed var(--line);border-radius:12px;padding:26px;text-align:center;color:var(--muted);font-size:14.5px}
#materials{background:var(--bg-soft)}

/* ---------- THÔNG BÁO NHỎ ---------- */
.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:12px 22px;border-radius:99px;font-size:14px;font-weight:500;z-index:300;opacity:0;pointer-events:none;transition:.25s}
.toast.on{opacity:1;transform:translateX(-50%)}

/* ---------- TRẠNG THÁI TẢI DỮ LIỆU ---------- */
.skel{border:1px solid var(--line);border-radius:var(--radius);height:330px;background:linear-gradient(100deg,#F1F5F9 30%,#F8FAFC 50%,#F1F5F9 70%);background-size:220% 100%;animation:sk 1.2s ease-in-out infinite}
@keyframes sk{to{background-position:-220% 0}}

@media(max-width:680px){
  .mdl{padding:0}
  .mdl-box{border-radius:0;min-height:100%}
  .frm .two{grid-template-columns:1fr}
  .mat{flex-wrap:wrap}
  .mat .get{width:100%}
}