/* DiciVN – Đấu trường Công dân số :: giao diện chung */
:root{
  --muc:#0A1633;        /* navy nền đậm */
  --bang:#101E45;       /* navy thẻ */
  --giay:#F3F7FF;       /* nền sáng */
  --the:#FFFFFF;
  --lam:#23B7E5;        /* xanh lam công nghệ */
  --lam-dam:#0E8FC0;
  --vang:#FFB730;       /* vàng giải thưởng */
  --chu:#16234B;
  --chu-mo:#5A6890;
  --vien:#DCE5F5;
  --loi:#D64545;
  --ok:#1E9E62;
  --bo:16px;
  --font-hien-thi:'Baloo 2',system-ui,sans-serif;
  --font-noi-dung:'Be Vietnam Pro',system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font-noi-dung);color:var(--chu);background:var(--giay);line-height:1.55;-webkit-font-smoothing:antialiased}
img{max-width:100%}
a{color:var(--lam-dam)}
h1,h2,h3{font-family:var(--font-hien-thi);line-height:1.15;margin:0 0 .4em}
.bao{max-width:1080px;margin:0 auto;padding:0 18px}

/* ===== thanh điều hướng ===== */
.dau-trang{position:sticky;top:0;z-index:50;background:rgba(10,22,51,.94);backdrop-filter:blur(8px);border-bottom:2px solid rgba(35,183,229,.35)}
.dau-trang .bao{display:flex;align-items:center;gap:18px;height:62px}
.logo{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-family:var(--font-hien-thi);font-weight:700;font-size:19px}
.logo .huyhieu{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--lam),#7BE0FF);display:grid;place-items:center;color:var(--muc);font-size:17px;font-weight:800}
.menu{margin-left:auto;display:flex;gap:4px}
.menu a{color:#CDDCF7;text-decoration:none;padding:9px 13px;border-radius:10px;font-family:var(--font-hien-thi);font-weight:700;font-size:15px;text-align:center;letter-spacing:.01em}
.menu a:hover{background:rgba(255,255,255,.09);color:#fff}
.menu a.mo{background:var(--lam);color:var(--muc)}
.menu a.tk{background:rgba(255,183,48,.16);color:var(--vang)}
@media(max-width:760px){
  .dau-trang .bao{height:auto;padding:8px 6px;flex-wrap:wrap;justify-content:center}
  .menu{margin:0 auto;flex-wrap:wrap;justify-content:center;gap:5px;width:100%}
  .menu a{flex:1 1 30%;font-size:13.5px;padding:9px 4px;border-radius:9px}
  .bao{padding:0 14px}
  .khoi{padding:22px 0 8px}
  .khoi h2{font-size:21px}
  .the{padding:14px}
  .the-form{padding:18px 14px;border-radius:14px}
  .hang-cta{margin:16px 0 0;gap:10px}
  .hang-cta .nut{flex:1 1 100%;justify-content:center;font-size:14.5px;padding:12px 16px}
  .mach{margin:24px 0 4px}
}

/* ===== hero trang chủ ===== */
.hero{position:relative;background:var(--muc) center/cover no-repeat;aspect-ratio:1250/500;max-height:560px;overflow:hidden}
@media(max-width:760px){.hero{aspect-ratio:1080/1500;max-height:none}}
.hang-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin:24px 0 0}
.hang-cta .nut{font-size:16px;padding:14px 26px}
.hero-noidung{position:relative;text-align:center;padding:64px 18px;max-width:820px}
.nhan-nho{display:inline-block;letter-spacing:.16em;font-size:12px;font-weight:700;color:var(--vang);border:1px solid rgba(255,183,48,.5);padding:6px 14px;border-radius:99px;margin-bottom:14px}
.hero h1{font-size:clamp(30px,5.4vw,52px);color:#fff;text-shadow:0 3px 18px rgba(0,0,0,.4)}
.hero p{font-size:clamp(15px,2.2vw,19px);color:#DCE8FF;margin:6px 0 24px}
.hang-nut{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* ===== nút ===== */
.nut{display:inline-flex;align-items:center;gap:8px;border:0;cursor:pointer;font-family:var(--font-noi-dung);font-weight:700;font-size:15px;padding:12px 22px;border-radius:12px;text-decoration:none;transition:transform .12s ease, box-shadow .12s ease}
.nut:active{transform:translateY(1px)}
.nut-lam{background:var(--lam);color:var(--muc);box-shadow:0 6px 18px rgba(35,183,229,.4)}
.nut-lam:hover{background:#3FC6EF}
.nut-vang{background:var(--vang);color:#3A2A00;box-shadow:0 6px 18px rgba(255,183,48,.35)}
.nut-vang:hover{background:#FFC65A}
.nut-trang{background:#fff;color:var(--chu);border:1.5px solid var(--vien)}
.nut-do{background:#FBE9E9;color:var(--loi)}
.nut-nho{padding:8px 14px;font-size:13.5px;border-radius:10px}

/* ===== đường mạch (chữ ký thị giác) ===== */
.mach{height:26px;background:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='260' height='26'><g fill='none' stroke='%2323B7E5' stroke-width='2' opacity='.55'><path d='M0 13h70l14-8h50l14 8h112'/><circle cx='84' cy='5' r='3' fill='%23FFB730' stroke='none'/><circle cx='148' cy='13' r='3' fill='%2323B7E5' stroke='none'/></g></svg>") repeat-x center;margin:34px 0 8px}

/* ===== khối nội dung ===== */
.khoi{padding:34px 0 14px}
.khoi h2{font-size:26px;display:flex;align-items:center;gap:10px}
.khoi h2 .cham{width:12px;height:12px;border-radius:4px;background:var(--vang);box-shadow:0 0 0 4px rgba(255,183,48,.22)}
.luoi-the{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));margin:16px 0 24px}
.the{background:var(--the);border:1.5px solid var(--vien);border-radius:var(--bo);padding:18px 20px;box-shadow:0 4px 14px rgba(22,35,75,.06);transition:transform .15s ease, box-shadow .15s ease}
.the:hover{transform:translateY(-3px);box-shadow:0 10px 24px rgba(22,35,75,.12)}
.the h3{font-size:18px}
.the .ngay{display:inline-block;background:rgba(255,183,48,.18);color:#8A5B00;font-weight:700;font-size:12.5px;padding:4px 10px;border-radius:8px;margin-bottom:8px}
.the p{color:var(--chu-mo);font-size:14.5px;margin:.35em 0 .8em;white-space:pre-line}
.the-tinhnang{text-align:center}
.the-tinhnang .bieu{width:56px;height:56px;margin:2px auto 10px;border-radius:16px;background:linear-gradient(135deg,#EAF7FF,#D8F1FF);display:grid;place-items:center;color:var(--lam-dam)}

/* ===== biểu mẫu ===== */
.the-form{background:var(--the);border:1.5px solid var(--vien);border-radius:18px;padding:26px;box-shadow:0 8px 26px rgba(22,35,75,.08);max-width:760px;margin:26px auto}
.the-form h2{font-size:24px}
.nhom-truong{margin:14px 0 0}
.nhom-truong>legend{font-family:var(--font-hien-thi);font-weight:700;color:var(--lam-dam);font-size:16px;padding:0}
fieldset{border:0;padding:0;margin:0 0 6px}
.hang-2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.hang-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
@media(max-width:640px){.hang-2,.hang-3{grid-template-columns:1fr}}
label{display:block;font-weight:600;font-size:13.5px;margin:12px 0 5px}
label .batbuoc{color:var(--loi)}
input,select,textarea{width:100%;font-family:var(--font-noi-dung);font-size:15px;padding:11px 13px;border:1.5px solid var(--vien);border-radius:11px;background:#FBFDFF;color:var(--chu)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--lam);box-shadow:0 0 0 3px rgba(35,183,229,.18)}
textarea{min-height:110px;resize:vertical}
.o-matkhau{position:relative}
.o-matkhau input{padding-right:46px}
.nut-mat{position:absolute;right:6px;top:50%;transform:translateY(-50%);border:0;background:none;cursor:pointer;color:var(--chu-mo);padding:6px;border-radius:8px}
.nut-mat:hover{color:var(--lam-dam);background:#EFF6FF}
.ghichu{font-size:13px;color:var(--chu-mo)}
.thongbao-loi{background:#FDECEC;color:#8F2B2B;border:1.5px solid #F3C1C1;border-radius:11px;padding:11px 14px;font-size:14px;margin:12px 0;display:none}
.thongbao-ok{background:#E8F7EF;color:#14603C;border:1.5px solid #BCE5CF;border-radius:11px;padding:11px 14px;font-size:14px;margin:12px 0;display:none}

/* ===== thẻ mã học sinh (kết quả đăng ký) ===== */
.the-ma{max-width:560px;margin:30px auto;background:linear-gradient(160deg,#0F2050,#0A1633);border-radius:22px;color:#fff;padding:30px 28px;text-align:center;border:1.5px solid rgba(35,183,229,.45);box-shadow:0 18px 44px rgba(10,22,51,.45);animation:hien .35s ease}
@keyframes hien{from{opacity:0;transform:translateY(10px) scale(.98)}to{opacity:1;transform:none}}
.the-ma .tem{color:var(--vang);letter-spacing:.14em;font-size:12px;font-weight:700}
.the-ma h2{color:#fff;font-size:24px;margin:.3em 0 .8em}
.o-ma{background:rgba(255,255,255,.07);border:1.5px dashed rgba(35,183,229,.6);border-radius:14px;padding:14px;margin:10px 0}
.o-ma .nhan{font-size:12.5px;color:#9FB4E4;font-weight:600}
.o-ma .giatri{font-family:var(--font-hien-thi);font-size:30px;font-weight:800;letter-spacing:.12em;color:#7BE0FF}
.the-ma .canhbao{font-size:13px;color:#FFD98A;margin-top:10px}
@media (prefers-reduced-motion: reduce){.the-ma{animation:none}.the:hover{transform:none}}

/* ===== khu tài khoản ===== */
.hang-avatar{display:grid;grid-template-columns:repeat(auto-fill,minmax(72px,1fr));gap:10px;margin:10px 0;max-height:330px;overflow-y:auto;padding:4px;border:1.5px solid var(--vien);border-radius:12px}
.hang-avatar img{width:72px;height:72px;border-radius:16px;border:2.5px solid transparent;cursor:pointer;background:#EAF3FF}
.hang-avatar img.chon{border-color:var(--vang);box-shadow:0 0 0 3px rgba(255,183,48,.3)}
.dau-tk{display:flex;gap:16px;align-items:center;margin-bottom:8px}
.dau-tk img{width:84px;height:84px;border-radius:20px;background:#EAF3FF;border:2px solid var(--vien)}
.ma-badge{display:inline-block;background:rgba(35,183,229,.14);color:var(--lam-dam);font-weight:800;letter-spacing:.08em;padding:4px 12px;border-radius:9px}

/* ===== quản trị ===== */
.tab-hang{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}
.tab-hang button{border:1.5px solid var(--vien);background:#fff;padding:10px 16px;border-radius:11px;font-weight:700;cursor:pointer;color:var(--chu-mo)}
.tab-hang button.mo{background:var(--muc);border-color:var(--muc);color:#fff}
.bang-du-lieu{width:100%;border-collapse:collapse;font-size:13.5px;background:#fff;border-radius:12px;overflow:hidden}
.bang-du-lieu th{background:var(--muc);color:#fff;text-align:left;padding:9px 10px;font-weight:600;white-space:nowrap}
.bang-du-lieu td{padding:8px 10px;border-bottom:1px solid var(--vien);vertical-align:top}
.bang-du-lieu tr:hover td{background:#F4F9FF}
.cuon-ngang{overflow-x:auto;border:1.5px solid var(--vien);border-radius:12px}
.xemtruoc-nen{width:100%;max-width:420px;border-radius:12px;border:1.5px solid var(--vien);background:#EAF1FC;min-height:90px;object-fit:cover}

/* ===== chân trang ===== */
.chan-trang{margin-top:44px;background:var(--muc);color:#B9C8EA;padding:26px 0 18px;font-size:13.5px}
.chan-trang .bao{display:flex;flex-wrap:wrap;gap:10px;align-items:flex-end;justify-content:space-between}
.chan-trang b{color:#fff;font-family:var(--font-hien-thi);font-size:15px}
.goc-quantri a{color:#5E7099;text-decoration:none;font-size:12px;border:1px solid rgba(255,255,255,.14);padding:4px 10px;border-radius:8px}
.goc-quantri a:hover{color:#fff;border-color:var(--lam)}