/* =========================================================================
   GIAO DIỆN KHẢO SÁT - đồng bộ với khaosat.thpttrannguyenhan.com
   Xanh #1d4ed8 / xanh đậm #1e3a8a, nhấn cam #f59e0b, nền #f6f8fc có hai vệt sáng,
   thẻ trắng bo góc lớn, nút cao 52-56px, ưu tiên điện thoại (mobile-first).
   Tệp này nạp SAU tnh.css nên ghi đè các biến màu và thành phần cũ. Chỉ có giao diện sáng.
   ========================================================================= */
:root, :root:not([data-theme="light"]){
  color-scheme: light;
  --brand:#1d4ed8; --brand-2:#1e3a8a; --amber:#f59e0b;
  --accent:#1d4ed8; --accent-soft:#eff6ff;
  --brand-red:#dc2626; --gold-line:#f59e0b;
  --paper:#f6f8fc; --surface:#ffffff; --surface-2:#f8fafc;
  --ink:#0f172a; --ink-2:#334155; --muted:#64748b;
  --line:#e2e8f0; --line-strong:#cbd5e1;
  --signal:#dc2626; --signal-soft:#fef2f2;
  --gold:#b45309; --gold-soft:#fffbeb;
  --r-lg:16px; --r-md:12px; --r-sm:8px;
  --shadow:0 1px 2px rgba(15,23,42,.06);
  --shadow-lift:0 8px 24px rgba(15,23,42,.10);
  --focus:0 0 0 3px rgba(29,78,216,.25);
  --serif:"Be Vietnam Pro","Segoe UI",system-ui,sans-serif;
}
@media (prefers-color-scheme:dark){
  :root, :root:not([data-theme="light"]){
    --accent:#1d4ed8; --accent-soft:#eff6ff; --paper:#f6f8fc; --surface:#fff; --surface-2:#f8fafc;
    --ink:#0f172a; --ink-2:#334155; --muted:#64748b; --line:#e2e8f0; --line-strong:#cbd5e1;
    --signal:#dc2626; --signal-soft:#fef2f2; --gold:#b45309; --gold-soft:#fffbeb;
    --shadow:0 1px 2px rgba(15,23,42,.06); --shadow-lift:0 8px 24px rgba(15,23,42,.10);
    --focus:0 0 0 3px rgba(29,78,216,.25);
  }
  .flash-ok{background:#ecfdf5;border-color:#a7f3d0;color:#065f46}
  .hero::before{display:none}
}

html{scroll-behavior:smooth}
body{
  font-family:"Be Vietnam Pro","Segoe UI",system-ui,-apple-system,sans-serif;
  background:
    radial-gradient(1200px 600px at 100% -10%, rgba(29,78,216,.08), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(245,158,11,.07), transparent 55%),
    #f6f8fc;
  background-attachment:fixed;
  color:var(--ink);font-size:16px;line-height:1.6;
  display:flex;flex-direction:column;min-height:100vh;
}
main{flex:1 0 auto;padding:22px 0 8px}
.wrap{max-width:900px;padding:0 16px}

/* ------------------------------------------------------------ đầu trang */
.top{background:linear-gradient(135deg,#1e3a8a 0%,#1d4ed8 100%);color:#fff;border:0;box-shadow:0 2px 10px rgba(15,23,42,.18);
  position:sticky;top:0;z-index:40}
.top::after{display:none}
.top .wrap{display:flex;align-items:center;gap:12px;padding-top:10px;padding-bottom:10px;max-width:900px}
.brand{display:flex;align-items:center;gap:11px;min-width:0;color:#fff;text-decoration:none}
.brand img{width:44px;height:44px;flex:0 0 auto;background:#fff;border-radius:50%;padding:2px;box-shadow:0 1px 3px rgba(0,0,0,.25)}
.school-name{display:flex;flex-direction:column;min-width:0;line-height:1.2}
.school-name .l1{font:800 13px/1.25 var(--serif);letter-spacing:.03em;text-transform:uppercase;color:#fff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.school-name .l2{font:500 11.5px/1.3 var(--serif);color:rgba(255,255,255,.82);text-transform:none;letter-spacing:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.school-name .l3{display:none}
.top-right{margin-left:auto;display:flex;align-items:center;gap:10px}
.top .ver{color:rgba(255,255,255,.85);font-size:12px}
.top button.ghost{background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.35);min-height:36px;padding:6px 12px;font-size:13px}
.top button.ghost:hover{background:rgba(255,255,255,.25);color:#fff}
.product{display:none}

/* thanh điều hướng quản trị */
.adminnav{background:#fff;border-bottom:1px solid var(--line);box-shadow:0 1px 2px rgba(15,23,42,.04);position:sticky;top:64px;z-index:30;overflow-x:auto;-webkit-overflow-scrolling:touch;white-space:nowrap}
.adminnav .wrap{display:flex;gap:2px;max-width:960px;padding:0 10px}
.adminnav a{padding:12px 14px;font-size:13.5px;font-weight:700;color:var(--ink-2);border-bottom:3px solid transparent;text-decoration:none;flex:0 0 auto}
.adminnav a.on{color:var(--brand);border-bottom-color:var(--amber)}
.top .adminnav .wrap{justify-content:flex-start}

/* --------------------------------------------------------- tiêu đề, thẻ */
h1{font:800 24px/1.3 var(--serif);color:var(--brand-2);letter-spacing:-.01em;padding:0;margin:0 0 16px}
h1::before{display:none}
h1 code{font-family:ui-monospace,Consolas,monospace}
h2{font:700 17px/1.35 var(--serif);color:var(--brand-2);margin:0 0 12px}
h3{font:700 16px/1.35 var(--serif);color:var(--ink)}
h4{color:var(--muted)}
.lead{color:var(--ink-2);font-size:16px}
.hint{color:var(--muted);font-size:14px}
.card,.combo,.q-item{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:20px}
.card{margin-bottom:14px}
.card h2{margin-bottom:10px}
.disclaimer{background:var(--gold-soft);border:1px solid #fde68a;border-left:4px solid var(--amber);border-radius:12px;color:#78350f;padding:14px 16px;font-size:14px}
.disclaimer strong{color:#78350f}
.warn{border-radius:12px}
.warn-cao{background:var(--signal-soft);border-color:var(--signal);color:#7f1d1d}
.warn-trung-binh{background:var(--gold-soft);border-color:var(--amber);color:#78350f}
a{color:var(--brand)}
code{background:#eef2ff;color:#3730a3;border-radius:6px;padding:2px 6px}
.flash-ok{background:#ecfdf5;border:1px solid #a7f3d0;border-left:4px solid #10b981;color:#065f46;border-radius:12px}

/* ------------------------------------------------------- ô nhập và nút */
label{color:var(--ink-2);font-weight:600;font-size:14px}
input,select,textarea{font-size:16px;min-height:48px;border-radius:10px;border:1px solid var(--line-strong);background:#fff;padding:10px 14px}
textarea{min-height:90px}
input:focus,select:focus,textarea:focus{border-color:var(--brand);box-shadow:var(--focus);outline:none}
input[type=checkbox],input[type=radio]{min-height:0}
button{min-height:48px;border-radius:12px;font-weight:700;font-size:15px;padding:11px 22px}
.primary{background:var(--brand);border:1px solid var(--brand);color:#fff;box-shadow:0 1px 2px rgba(29,78,216,.35)}
.primary:hover{background:#1e40af;border-color:#1e40af}
.primary:active,.ghost:active{transform:scale(.98)}
.ghost{background:#fff;border:1px solid var(--line-strong);color:var(--ink-2)}
.ghost:hover{background:#f1f5f9;color:var(--ink)}
.danger{background:#dc2626;border-color:#dc2626;color:#fff}
.btn-xl{min-height:56px;font-size:16px;border-radius:14px;width:100%}
.actions{gap:10px}
.actions .primary{min-height:52px;padding-left:28px;padding-right:28px}

/* ------------------------------------------------------- hero trang chủ */
.hero{position:relative;overflow:hidden;border-radius:20px;margin:0 0 18px;min-height:0;
  background:linear-gradient(135deg,#1e3a8a,#1d4ed8);box-shadow:0 10px 30px rgba(30,58,138,.25);
  display:grid;grid-template-columns:1fr;border:0}
.hero::before{display:none}
.hero .photo{display:block;width:100%;height:190px;object-fit:cover;object-position:60% 30%}
.hero .in{position:relative;padding:20px 20px 24px;max-width:none;color:#fff}
.hero .in .pill{display:inline-block;background:var(--amber);color:#0f172a;font:800 12px/1 var(--serif);letter-spacing:.04em;text-transform:uppercase;padding:7px 12px;border-radius:999px}
.hero .in strong{display:block;font:800 25px/1.2 var(--serif);color:#fff;margin-top:12px;text-transform:uppercase}
.hero .in strong em{font-style:normal;color:#fde68a}
.hero .in .rule2{width:46px;height:3px;background:var(--amber);border-radius:2px;margin:12px 0 10px}
.hero .in span.sub{display:block;font-size:14.5px;color:rgba(255,255,255,.9);margin:0}
.hero .in .school{display:flex;align-items:center;gap:8px;margin-top:14px;font-size:13px;color:rgba(255,255,255,.85)}
@media (min-width:700px){
  .hero{grid-template-columns:5fr 7fr;min-height:300px}
  .hero .in{padding:30px 28px;display:flex;flex-direction:column;justify-content:center;grid-column:1;grid-row:1}
  .hero .photo{grid-column:2;grid-row:1;height:100%;min-height:300px;position:absolute;right:0;top:0;width:60%;
    -webkit-mask-image:radial-gradient(130% 150% at 100% 50%,#000 62%,transparent 63%);mask-image:radial-gradient(130% 150% at 100% 50%,#000 62%,transparent 63%);
    -webkit-mask-composite:source-over}
  .hero::after{content:"";position:absolute;top:-10%;bottom:-10%;right:calc(60% - 6%);width:12%;border-left:4px solid var(--amber);border-radius:50% 0 0 50%/50% 0 0 50%;pointer-events:none;opacity:.9}
  .hero .in strong{font-size:30px}
}

/* ------------------------------------------------------- khối nhập mã */
.entry-card{padding:22px}
.entry-card .pillrow{display:flex;justify-content:center;margin-bottom:8px}
.pill-soft{display:inline-block;background:rgba(29,78,216,.10);color:var(--brand);font:800 12px/1 var(--serif);letter-spacing:.05em;text-transform:uppercase;padding:7px 12px;border-radius:999px}
.entry-card h1,.entry-card h2.big{text-align:center;text-transform:uppercase;font:800 20px/1.35 var(--serif);color:var(--brand-2);margin:6px 0 8px}
.entry-card .intro{text-align:center;color:var(--ink-2);font-size:14.5px;margin:0 auto 16px;max-width:620px}
.entry-card form{max-width:520px;margin:0 auto}
.entry-card input{text-align:center;font-size:18px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;min-height:54px}
.entry-card .code-hint{text-align:center;font-size:13px;color:var(--muted);margin:8px 0 0}

/* ------------------------------------------------ hướng dẫn nhanh 3 bước */
.guide-title{text-align:center;font:700 17px/1.3 var(--serif);color:var(--ink-2);margin:22px 0 12px}
.guide{display:grid;gap:12px;grid-template-columns:1fr}
.guide .g{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:16px 16px 16px 16px;transition:box-shadow .15s}
.guide .g:hover{box-shadow:var(--shadow-lift)}
.guide .n{position:absolute;right:16px;top:12px;font:900 28px/1 var(--serif);color:rgba(29,78,216,.35)}
.guide .ic{display:flex;align-items:center;gap:12px;padding-right:34px}
.guide .ic i{flex:0 0 auto;width:42px;height:42px;border-radius:12px;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-style:normal;font-size:19px}
.guide .ic b{font:700 15px/1.3 var(--serif);color:var(--ink)}
.guide p{margin:10px 0 0;font-size:13.5px;color:var(--muted);line-height:1.55}
@media (min-width:700px){.guide{grid-template-columns:repeat(3,1fr)}}

/* ------------------------------------------------------------ các bước */
.steps{display:flex;align-items:flex-start;justify-content:space-between;gap:2px;margin:0 0 18px;padding:14px 8px 10px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}
.steps .s{flex:1 1 0;min-width:0;display:flex;flex-direction:column;align-items:center;position:relative}
.steps .s::before{content:"";position:absolute;top:17px;left:-50%;width:100%;height:4px;border-radius:2px;background:#e2e8f0;z-index:0}
.steps .s:first-child::before{display:none}
.steps .s.done::before,.steps .s.on::before{background:var(--brand)}
.steps .c{position:relative;z-index:1;width:34px;height:34px;border-radius:50%;border:2px solid #e2e8f0;background:#fff;color:#94a3b8;font:800 14px/30px var(--serif);text-align:center}
.steps .s.done .c{background:var(--brand);border-color:var(--brand);color:#fff}
.steps .s.on .c{border-color:var(--brand);color:var(--brand);box-shadow:0 0 0 4px rgba(29,78,216,.15)}
.steps .l{margin-top:6px;font:600 10.5px/1.2 var(--serif);color:#94a3b8;text-align:center;padding:0 1px}
.steps .s.on .l{color:var(--brand)}
.steps .s.done .l{color:var(--ink-2)}

/* ------------------------------------------------- câu hỏi trắc nghiệm */
.q-item{padding:16px;margin-bottom:12px;transition:border-color .15s,background .15s}
.q-item.answered{border-color:#bfdbfe;background:#fff}
.q-item.missing{border-color:#f87171;background:#fef2f2}
.q-text{font-size:16px;font-weight:600;line-height:1.5;color:var(--ink);margin-bottom:12px;gap:10px;align-items:flex-start}
.q-num{display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;min-width:26px;height:26px;border-radius:50%;background:#eff6ff;color:var(--brand);font-size:12.5px;font-weight:800;margin-top:1px}
.q-item.answered .q-num{background:var(--brand);color:#fff}
.q-opts{display:grid;gap:8px;grid-template-columns:repeat(5,1fr)}
.q-opts.n3{grid-template-columns:repeat(3,1fr)}
.q-opt{flex:none;position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-height:52px;padding:8px 4px;border:1.5px solid var(--line-strong);border-radius:12px;background:#fff;color:var(--ink-2);cursor:pointer;font-size:15.5px;font-weight:700;text-align:center;transition:all .12s;-webkit-tap-highlight-color:transparent}
.q-opt input{position:absolute;opacity:0;width:100%;height:100%;inset:0;margin:0;cursor:pointer;min-height:0}
.q-opt:hover{border-color:var(--brand);background:#f8fbff}
.q-opt:has(input:checked){background:var(--brand);border-color:var(--brand);color:#fff;box-shadow:0 2px 8px rgba(29,78,216,.30)}
.q-opt input:checked ~ span,.q-opt input:checked ~ small{color:#fff}
.q-opt:focus-within{box-shadow:var(--focus)}
.q-opt small{font-size:11px;font-weight:600;color:var(--muted);line-height:1.25}
/* 3 mức: hiện đủ chữ, bỏ số */
.q-opts.n3 .q-opt{min-height:54px;font-size:14.5px}
.q-opts.n3 .q-opt span{display:none}
.q-opts.n3 .q-opt small{position:static;width:auto;height:auto;overflow:visible;clip:auto;white-space:normal;font-size:14px;font-weight:700;color:var(--ink-2)}
.q-opts.n3 .q-opt:has(input:checked) small{color:#fff}
.q-anchors{display:flex;justify-content:space-between;gap:10px;margin-top:8px;font-size:11.5px;color:var(--muted);line-height:1.35}
.q-opts.n3 + .q-anchors{display:none}
.q-opts:not(.n3) .q-opt small{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
@media (min-width:700px){
  .q-opts:not(.n3) .q-opt small{position:static;width:auto;height:auto;clip:auto;white-space:normal}
  .q-anchors{display:none}
  .q-opt{min-height:60px}
}

/* ---------------------------------------------------- thanh dính phía dưới */
.sticky-bar{position:sticky;bottom:0;z-index:20;margin:14px -16px 0;padding:12px 16px calc(12px + env(safe-area-inset-bottom));background:rgba(255,255,255,.96);backdrop-filter:blur(6px);border-top:1px solid var(--line);box-shadow:0 -4px 16px rgba(15,23,42,.08);display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:nowrap}
.sticky-bar::before{content:"";position:absolute;left:0;top:-1px;height:3px;background:var(--brand);width:calc(var(--p,0) * 1%);border-radius:0 3px 3px 0;transition:width .2s}
.sticky-bar span{font-size:14px;font-weight:700;color:var(--ink-2);max-width:none;white-space:nowrap}
.sticky-bar span.done{color:#059669}
.sticky-bar button{flex:0 0 auto;min-height:48px;padding:10px 20px}
@media (max-width:520px){.sticky-bar{margin:14px -16px 0}.sticky-bar button{flex:1 1 auto}.sticky-bar span{flex:0 0 auto}}

/* --------------------------------------------------- bảng, kết quả */
.rank-badge{background:#eff6ff;color:var(--brand)}
.combo.rank1{border:2px solid var(--brand);box-shadow:0 8px 24px rgba(29,78,216,.14)}
.combo.rank1 .rank-badge{background:var(--brand);color:#fff}
.rel b{color:var(--brand)}
th{background:#eff6ff;color:var(--brand-2)}
.tbl-scroll{border-radius:12px}
.entry{border-radius:12px;border-color:var(--line);background:#fff}
.entry:hover{border-color:var(--brand);background:#eff6ff}
.entry strong{color:var(--brand)}

/* ------------------------------------------------------------ chân trang */
.bottom{margin-top:36px;padding:22px 0 calc(22px + env(safe-area-inset-bottom));background:var(--brand-2);border:0;color:#e2e8f0}
.bottom .wrap{display:flex;flex-direction:column;gap:12px;align-items:flex-start}
.bottom .fname{font:800 14px/1.3 var(--serif);letter-spacing:.03em;text-transform:uppercase;color:#fff}
.bottom .fsub{font-size:13px;color:rgba(255,255,255,.78);margin-top:2px}
.bottom a.tel{display:inline-flex;align-items:center;gap:10px;background:var(--amber);color:#0f172a;text-decoration:none;border-radius:12px;padding:9px 14px;font-weight:800;line-height:1.15}
.bottom a.tel small{display:block;font-size:10.5px;text-transform:uppercase;font-weight:700}
.bottom a.tel b{font-size:17px}
@media (min-width:700px){.bottom .wrap{flex-direction:row;justify-content:space-between;align-items:center}}

/* ------------------------------------------------------- điện thoại */
@media (max-width:620px){
  body{font-size:15.5px}
  main{padding:16px 0 6px}
  h1{font-size:21px}
  .card,.combo{padding:16px}
  .hero .in strong{font-size:23px}
  .actions{flex-direction:column}
  .actions button,.actions a{width:100%}
  .actions a button{width:100%}
  .school-name .l1{font-size:12px}
  .adminnav{top:60px}
  .top .ver{display:none}
}
@media (max-width:360px){.school-name .l2{display:none}}

/* hàng nhập điểm: tên môn bên trái, ô nhập bên phải, đủ lớn cho ngón tay */
.score-row{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:9px 0;border-bottom:1px solid #f1f5f9;font-weight:600;color:var(--ink)}
.score-row:last-of-type{border-bottom:0}
.score-row input{width:112px;margin:0;text-align:center;font-weight:700}

/* ---- sửa tràn ngang trên điện thoại (trang quản trị) */
.wrap{width:100%;margin-left:auto;margin-right:auto}
main.wrap{min-width:0}
.top .brand{flex:1 1 0;min-width:0}
.top .top-right{flex:0 0 auto}
.top .top-right button{white-space:nowrap}
.adminnav .wrap{flex-wrap:nowrap;width:max-content;min-width:100%}
.adminnav a{white-space:nowrap}
.result-head{flex-wrap:wrap}
.card,.tbl-scroll,form{max-width:100%}
.grid2{grid-template-columns:repeat(auto-fit,minmax(min(220px,100%),1fr))}
img{max-width:100%}

.top .wrap{flex-wrap:nowrap}
.top .top-right form{gap:8px}


/* =========================== LÀM LẠI TRANG CHỦ: thoáng hơn, chuyên nghiệp hơn =========================== */
/* .wrap đặt padding:0 16px nên ghi đè mất khoảng trống phía trên; đặt lại riêng cho main */
main.wrap{padding-top:34px;padding-bottom:12px}
.hero{margin-top:0;margin-bottom:22px;border-radius:22px}
.hero .in strong{letter-spacing:.005em}
.hero-cta{display:inline-flex;align-items:center;gap:8px;align-self:flex-start;margin-top:18px;background:var(--amber);color:#0f172a;
  font:800 14.5px/1 var(--serif);padding:13px 20px;border-radius:12px;text-decoration:none;box-shadow:0 4px 14px rgba(245,158,11,.35);transition:transform .12s,filter .12s}
.hero-cta:hover{filter:brightness(1.05);transform:translateY(-1px)}
@media (min-width:700px){.hero{min-height:320px}}

.facts{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:0 0 22px}
.facts .f{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 14px 13px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:2px}
.facts .f i{width:38px;height:38px;border-radius:11px;background:#eff6ff;color:var(--brand);display:flex;align-items:center;justify-content:center;margin-bottom:6px}
.facts .f b{font:700 14px/1.3 var(--serif);color:var(--ink)}
.facts .f span{font-size:12.5px;color:var(--muted);line-height:1.4}
@media (min-width:760px){.facts{grid-template-columns:repeat(4,1fr)}}

.entry-card{scroll-margin-top:84px;padding:26px 22px;border-radius:18px;box-shadow:0 8px 28px rgba(15,23,42,.07)}
.guide-title{margin-top:30px}
.guide .ic i{display:flex;align-items:center;justify-content:center}
.guide .ic i svg{display:block}
.roles{display:grid;gap:12px;grid-template-columns:1fr;margin-top:18px}
.roles a{display:block;text-decoration:none;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px;transition:border-color .15s,box-shadow .15s}
.roles a:hover{border-color:var(--brand);box-shadow:var(--shadow-lift)}
.roles b{display:block;font:700 14.5px/1.3 var(--serif);color:var(--brand)}
.roles span{display:block;font-size:13px;color:var(--muted);margin-top:2px}
@media (min-width:640px){.roles{grid-template-columns:1fr 1fr}}
.top-admin{color:#fff;font-size:13px;font-weight:700;text-decoration:none;padding:7px 12px;border:1px solid rgba(255,255,255,.4);border-radius:9px}
@media (max-width:620px){main.wrap{padding-top:22px}.hero{border-radius:18px}}