/* ===== Samio.fun — giao diện (brand #0a8fdc, Be Vietnam Pro, Ant Design) ===== */
@import url('fonts.css');
:root{
  --primary:#0a8fdc; --primary-d:#006db5; --primary-h:#31abe8;
  --primary-l:#e6f7ff; --primary-l2:#f0faff; --primary-border:#87dfff;
  --green:#52c41a; --green-l:#f6ffed; --green-b:#b7eb8f;
  --red:#ff4d4f; --red-l:#fff2f0; --red-b:#ffccc7;
  --amber:#faad14; --amber-l:#fffbe6;
  --bg:#f5f7fa; --card:#fff;
  --line:#f0f0f0; --line2:#d9d9d9;
  --text:rgba(0,0,0,.88); --muted:rgba(0,0,0,.45); --muted2:rgba(0,0,0,.65);
  --radius:8px; --radius-lg:12px;
  --shadow:0 1px 2px rgba(0,0,0,.03),0 1px 6px -1px rgba(0,0,0,.02),0 2px 4px rgba(0,0,0,.02);
  --shadow-lg:0 6px 16px 0 rgba(0,0,0,.08),0 3px 6px -4px rgba(0,0,0,.12);
}
*{box-sizing:border-box}
body{margin:0;font-family:'Be Vietnam Pro',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);font-size:14px;line-height:1.5715}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-h);text-decoration:none}
h1,h2,h3{margin:0 0 .4em;color:var(--text);font-weight:700}

/* layout */
.app-shell{display:flex;min-height:100vh}
.sidebar{width:248px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;position:fixed;top:0;bottom:0;left:0;z-index:40}
.brand{display:flex;align-items:center;gap:8px;padding:14px 18px;height:64px}
.brand:hover{text-decoration:none}
.brand img{height:30px;width:auto;display:block}
.brand-mark{background:var(--primary);color:#fff;width:34px;height:34px;border-radius:8px;display:grid;place-items:center;font-size:14px;font-weight:800;font-family:'Quicksand',sans-serif}
.brand-text{font-family:'Quicksand',sans-serif;font-weight:700;font-size:20px;color:var(--primary)}
.nav{flex:1;overflow-y:auto;padding:6px 8px}
.nav::-webkit-scrollbar{width:6px}.nav::-webkit-scrollbar-thumb{background:#e0e0e0;border-radius:3px}
.nav-group{font-size:11px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);margin:14px 12px 4px;font-weight:700}
.nav-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:8px;color:var(--muted2);font-weight:500;margin-bottom:2px;transition:all .15s}
.nav-item:hover{background:var(--primary-l2);color:var(--primary);text-decoration:none}
.nav-item.active{background:var(--primary-l);color:var(--primary);font-weight:600}
.nav-item .ico{width:18px;height:18px;display:inline-flex;flex:none}
.nav-item .ico svg{width:18px;height:18px}
.sidebar-foot{border-top:1px solid var(--line);padding:8px}

.main{flex:1;margin-left:248px;display:flex;flex-direction:column;min-width:0}
.topbar{height:64px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:14px;padding:0 24px;position:sticky;top:0;z-index:30}
.topbar-title{font-weight:600;font-size:16px}
.topbar-right{margin-left:auto;display:flex;align-items:center;gap:14px}
.hamb{display:none;border:0;background:none;font-size:20px;cursor:pointer;color:var(--muted2)}
.user-chip{display:flex;align-items:center;gap:8px;color:var(--text)}
.user-chip:hover{text-decoration:none;color:var(--text)}
.avatar{width:32px;height:32px;border-radius:50%;background:var(--primary);color:#fff;display:grid;place-items:center;font-weight:600;font-size:14px}
.uname{font-weight:600;font-size:14px}
.content{padding:24px;max-width:1240px;width:100%}

/* badges */
.badge{font-size:12px;font-weight:600;padding:1px 9px;border-radius:4px;border:1px solid transparent;line-height:20px;display:inline-block}
.badge-admin{background:var(--red-l);color:var(--red);border-color:var(--red-b)}
.badge-teacher{background:var(--primary-l);color:var(--primary-d);border-color:var(--primary-border)}
.badge-student{background:var(--green-l);color:var(--green);border-color:var(--green-b)}
.pill{display:inline-block;font-size:12px;font-weight:500;padding:1px 8px;border-radius:4px;background:#fafafa;color:var(--muted2);border:1px solid var(--line)}

/* cards / grid */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow)}
.card-pad{padding:20px}
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.page-head{display:flex;align-items:center;gap:12px;margin-bottom:20px}
.page-head h1{font-size:20px;margin:0;font-weight:700}
.page-head .spacer{flex:1}
.muted{color:var(--muted)}
.small{font-size:13px}

/* stat */
.stat{padding:20px;border-radius:var(--radius-lg);background:#fff;border:1px solid var(--line);box-shadow:var(--shadow)}
.stat .num{font-size:30px;font-weight:700;color:var(--text)}
.stat .lbl{color:var(--muted);font-size:13px;margin-top:2px}
.stat .ico{float:right;font-size:24px;opacity:.9;color:var(--primary)}

/* buttons (antd style) */
.btn{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--primary);background:var(--primary);color:#fff;padding:7px 16px;border-radius:6px;font-weight:500;cursor:pointer;font-size:14px;font-family:inherit;transition:all .15s;box-shadow:0 2px 0 rgba(5,145,255,.06)}
.btn:hover{background:var(--primary-h);border-color:var(--primary-h);text-decoration:none;color:#fff}
.btn-ghost{background:#fff;color:var(--text);border-color:var(--line2)}
.btn-ghost:hover{background:#fff;color:var(--primary);border-color:var(--primary)}
.btn-danger{background:var(--red);border-color:var(--red)}.btn-danger:hover{background:#ff7875;border-color:#ff7875}
.btn-success{background:var(--green);border-color:var(--green)}.btn-success:hover{background:#73d13d;border-color:#73d13d}
.btn-sm{padding:3px 11px;font-size:13px;border-radius:6px}
.btn-block{width:100%;justify-content:center}

/* tables */
.table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line)}
.table th,.table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line)}
.table th{background:#fafafa;font-size:13px;font-weight:600;color:var(--muted2)}
.table tr:last-child td{border-bottom:0}
.table tbody tr:hover td{background:var(--primary-l2)}

/* forms */
.form-row{margin-bottom:16px}
.form-row label{display:block;font-weight:500;font-size:14px;margin-bottom:6px;color:var(--text)}
.input,.select,.textarea{width:100%;padding:7px 11px;border:1px solid var(--line2);border-radius:6px;font-size:14px;font-family:inherit;background:#fff;transition:all .15s;color:var(--text)}
.input:focus,.select:focus,.textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 2px rgba(10,143,220,.1)}
.textarea{min-height:84px;resize:vertical}
.row{display:flex;gap:12px}.row>*{flex:1}

/* alerts */
.alert{padding:9px 16px;border-radius:8px;margin-bottom:16px;font-weight:500;border:1px solid transparent}
.alert-info{background:var(--primary-l);color:var(--primary-d);border-color:var(--primary-border)}
.alert-success{background:var(--green-l);color:#389e0d;border-color:var(--green-b)}
.alert-warn{background:var(--amber-l);color:#d48806;border-color:#ffe58f}
.alert-error,.alert-danger{background:var(--red-l);color:var(--red);border-color:var(--red-b)}

/* auth pages */
.auth-wrap{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,#eafbe3 0%,#cfeebb 50%,#aee08e 100%);padding:20px}
.auth-card{background:#fff;border-radius:16px;padding:36px;width:100%;max-width:420px;box-shadow:var(--shadow-lg)}
.auth-card .brand{justify-content:center;padding:0 0 8px;height:auto}
.auth-sub{text-align:center;color:var(--muted);margin-bottom:24px}
.auth-alt{text-align:center;margin-top:18px;font-size:14px}

/* modal (antd style) */
.ym-mask{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:1000;display:none;align-items:flex-start;justify-content:center;overflow:auto;padding:60px 16px}
.ym-mask.open{display:flex}
.ym{background:#fff;border-radius:8px;width:100%;max-width:560px;box-shadow:var(--shadow-lg);animation:ymin .2s}
@keyframes ymin{from{transform:translateY(-12px);opacity:.6}to{transform:none;opacity:1}}
.ym-head{padding:16px 20px;border-bottom:1px solid var(--line);font-weight:600;font-size:16px;display:flex;align-items:center}
.ym-head .x{margin-left:auto;cursor:pointer;color:var(--muted);font-size:18px;border:0;background:none}
.ym-body{padding:20px;max-height:60vh;overflow:auto}
.ym-foot{padding:12px 20px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:8px}

/* section title (form mục) */
.sec-title{font-size:15px;font-weight:700;color:var(--primary-d);margin:0 0 14px;padding-bottom:8px;border-bottom:1px solid var(--line)}

/* tabs */
.tabs{display:flex;gap:4px;border-bottom:2px solid transparent}
.tab{border:0;background:none;padding:8px 16px;cursor:pointer;font-size:14px;font-weight:500;color:var(--muted2);font-family:inherit;border-bottom:2px solid transparent;margin-bottom:-15px}
.tab:hover{color:var(--primary)}
.tab.active{color:var(--primary);border-bottom-color:var(--primary)}

/* empty state */
.empty{text-align:center;padding:48px 20px;color:var(--muted)}
.empty .big{font-size:40px;margin-bottom:8px}

/* flashcard */
.flash-stage{max-width:600px;margin:0 auto}
.flashcard{perspective:1400px;height:320px;cursor:pointer}
.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}
.flashcard.flip .flashcard-inner{transform:rotateY(180deg)}
.flash-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:16px;display:grid;place-items:center;text-align:center;padding:24px;box-shadow:var(--shadow-lg);border:1px solid var(--line);background:#fff}
.flash-face .big{font-size:38px;font-weight:700;color:var(--text)}
.flash-face .ph{color:var(--muted);margin-top:8px}
.flash-back{transform:rotateY(180deg);background:var(--primary-l)}
.flash-controls{display:flex;justify-content:center;gap:12px;margin-top:20px;align-items:center}

/* quiz / test */
.q-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:20px;margin-bottom:16px;box-shadow:var(--shadow)}
.q-head{display:flex;gap:10px;margin-bottom:12px}
.q-num{background:var(--primary);color:#fff;width:28px;height:28px;border-radius:8px;display:grid;place-items:center;font-weight:600;flex:none}
.opt{display:flex;align-items:center;gap:10px;padding:10px 14px;border:1px solid var(--line2);border-radius:8px;margin-bottom:8px;cursor:pointer;transition:all .15s}
.opt:hover{background:var(--primary-l2);border-color:var(--primary-border)}
.opt input{width:16px;height:16px;accent-color:var(--primary)}
.opt.correct{background:var(--green-l);border-color:var(--green-b)}
.opt.wrong{background:var(--red-l);border-color:var(--red-b)}
.result-score{text-align:center;padding:30px}
.result-score .big{font-size:54px;font-weight:800;color:var(--primary)}

/* rich text editor (bài đọc) */
.rt-wrap{border:1px solid var(--line2);border-radius:10px;overflow:hidden}
.rt-tools{display:flex;flex-wrap:wrap;gap:2px;background:#fafbff;border-bottom:1px solid var(--line);padding:6px}
.rt-tools button{border:1px solid var(--line);background:#fff;border-radius:6px;padding:4px 9px;cursor:pointer;font-size:13px}
.rt-tools button:hover{border-color:var(--primary);color:var(--primary)}
.rt-ed{min-height:280px;max-height:520px;overflow:auto;padding:14px 16px;outline:none;font-size:15px;line-height:1.7;border:2px solid var(--line2);border-top:0;background:#fff}
.rt-ed:focus{border-color:var(--primary);box-shadow:inset 0 0 0 1px var(--primary)}
.rt-wrap{border:0}
.rt-tools{border:2px solid var(--line2);border-bottom:0;border-radius:10px 10px 0 0}
.rt-ed img{max-width:100%}
.rt-ed iframe{max-width:100%}

/* question type bar */
.qtype-bar{display:flex;flex-wrap:wrap;gap:8px}
.qtbtn{border:1px solid var(--line2);background:#fff;color:var(--text);padding:7px 14px;border-radius:6px;font-size:13px;font-weight:500;cursor:pointer;font-family:inherit;transition:all .15s}
.qtbtn:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-l2)}

/* question builder */
.qb-item{border:1px solid var(--line);border-radius:var(--radius-lg);padding:16px;margin-bottom:14px;background:#fff;box-shadow:var(--shadow)}
.qb-card-head{display:flex;align-items:center;gap:6px;flex-wrap:wrap;padding-bottom:10px;border-bottom:1px solid var(--line)}
.qb-cau{color:var(--primary-d)}
.qb-item .qb-head{display:flex;gap:10px;align-items:center;margin-bottom:12px}
.opt-row{display:flex;gap:8px;align-items:center;margin-bottom:6px}
.opt-row input[type=text]{flex:1}
.match-row{display:flex;gap:8px;margin-bottom:6px}

/* landing */
.hero{background:linear-gradient(135deg,#0a8fdc 0%,#31abe8 60%,#87dfff 100%);color:#fff;padding:84px 20px;text-align:center}
.hero h1{font-size:42px;margin-bottom:14px;color:#fff;font-weight:800}
.hero p{font-size:18px;opacity:.96;max-width:640px;margin:0 auto 28px}
.hero .btn-ghost{background:rgba(255,255,255,.16);color:#fff;border-color:rgba(255,255,255,.5)}
.hero .btn-ghost:hover{background:rgba(255,255,255,.26);color:#fff}
.landing-nav{display:flex;align-items:center;padding:14px 28px;gap:12px;background:#fff;border-bottom:1px solid var(--line)}
.landing-nav .brand{padding:0;height:auto}
.feature-sec{max-width:1080px;margin:60px auto;padding:0 20px}
.feature-sec .card-pad>div:first-child{color:var(--primary)}

@media(max-width:860px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .sidebar{transform:translateX(-100%);transition:.25s}
  .sidebar.open{transform:none}
  .main{margin-left:0}
  .hero h1{font-size:32px}
}
@media(max-width:560px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.row{flex-direction:column}}

/* ===== Samio.fun — polish G2.5 (bảng/dashboard/a11y) ===== */
/* Bảng cuộn ngang trên mobile, không đổi HTML */
@media(max-width:760px){
  .table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;white-space:nowrap}
}
/* Sọc nhẹ + hover cho bảng */
.table tbody tr:nth-child(even) td{background:#fafbfc}
.table tbody tr:hover td{background:var(--primary-l2)}
/* Focus ring rõ ràng (accessibility) */
.btn:focus-visible,.tab:focus-visible,.nav-item:focus-visible,.input:focus-visible,.select:focus-visible,.textarea:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
/* Thẻ thống kê dashboard: hover nhấc nhẹ */
.stat{transition:transform .18s ease,box-shadow .18s ease}
.stat:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.card-hover{transition:transform .18s ease,box-shadow .18s ease}
.card-hover:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}

/* ===== Samio.fun — ô tìm kiếm topbar (G4.3) ===== */
.topsearch{flex:1;max-width:420px;margin:0 14px}
.topsearch input{width:100%;height:38px;border:1px solid var(--line2);border-radius:999px;padding:0 16px;font-size:14px;outline:none;background:var(--bg);font-family:inherit}
.topsearch input:focus{border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px var(--primary-l)}
@media(max-width:680px){.topsearch{display:none}}
/* ===== Samio.fun — spinner loading (G3.3) ===== */
.spin{display:inline-block;width:14px;height:14px;border:2px solid rgba(10,143,220,.25);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite;vertical-align:-2px;margin-right:6px}
@keyframes spin{to{transform:rotate(360deg)}}
.btn[disabled]{opacity:.65;cursor:progress}
/* stat dạng link (dashboard) giữ màu chữ, bỏ gạch chân */
a.stat,a.stat:hover{text-decoration:none;color:var(--text)}
a.stat .lbl{color:var(--muted)}

/* Spinner tải/chấm AI dùng chung */
.ld-spin{display:inline-block;width:15px;height:15px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;animation:ldspin .6s linear infinite;vertical-align:-2px}
@keyframes ldspin{to{transform:rotate(360deg)}}

/* ===== Samio.fun UI v2 — app shell hiện đại (sidebar navy thương hiệu, accent gradient) ===== */
body{background:#f4f7fb}

/* ---- Sidebar: navy gradient như landing/auth ---- */
.sidebar{background:radial-gradient(700px 520px at 115% -12%,#15457c 0%,#0c2b51 46%,#0b1f3a 100%);border-right:0;box-shadow:2px 0 16px rgba(11,31,58,.16)}
.sidebar .brand{height:66px;padding:16px 18px;border-bottom:1px solid rgba(255,255,255,.07)}
.sidebar .brand img{height:32px}
.nav{padding:8px 10px}
.nav-group{color:#7e96b8;margin:16px 12px 6px;letter-spacing:.08em}
.sidebar .nav-item{color:#c2d2e8;font-weight:500;border-radius:10px;padding:9.5px 12px}
.sidebar .nav-item:hover{background:rgba(255,255,255,.08);color:#fff}
.sidebar .nav-item.active{background:linear-gradient(90deg,var(--primary),#1ea5f2);color:#fff;font-weight:600;box-shadow:0 6px 14px rgba(10,143,220,.35)}
.sidebar-foot{border-top:1px solid rgba(255,255,255,.08);padding:10px}
.nav::-webkit-scrollbar-thumb{background:rgba(255,255,255,.16)}
@media(max-width:860px){.sidebar.open{box-shadow:0 0 0 100vmax rgba(11,31,58,.45),2px 0 18px rgba(0,0,0,.4)}}

/* ---- Topbar: kính mờ + chip người dùng ---- */
.topbar{background:rgba(255,255,255,.88);backdrop-filter:blur(10px);border-bottom:1px solid #e8eef5}
.topbar-title{font-weight:700;font-size:17px;letter-spacing:-.2px}
.user-chip{padding:5px 12px 5px 6px;border-radius:999px;transition:background .15s}
.user-chip:hover{background:#eef4fa}
.avatar{background:linear-gradient(135deg,var(--primary),#22c55e);box-shadow:0 3px 8px rgba(10,143,220,.3)}
.hamb{color:#33415a}

/* ---- Nội dung & thẻ ---- */
.content{padding:26px 28px}
.card{border-radius:14px;border-color:#e8eef5}
.page-head{margin-bottom:22px}
.page-head h1{font-size:22px;letter-spacing:-.3px}

/* ---- Thẻ thống kê: icon trong ô màu ---- */
.stat{border-radius:14px;border-color:#e8eef5}
.stat .ico{float:right;width:46px;height:46px;background:linear-gradient(135deg,var(--primary-l),#e8fbef);border-radius:13px;display:grid;place-items:center;font-size:22px;opacity:1}
.stat .num{font-size:30px;font-weight:800;letter-spacing:-.5px}

/* ---- Nút: bo tròn + nổi nhẹ ---- */
.btn{border-radius:9px;font-weight:600;box-shadow:0 2px 6px rgba(10,143,220,.16)}
.btn:hover{transform:translateY(-1px);box-shadow:0 6px 14px rgba(10,143,220,.24)}
.btn:active{transform:none}
.btn-ghost{box-shadow:none}
.btn-danger{box-shadow:0 2px 6px rgba(255,77,79,.16)}
.btn-success{box-shadow:0 2px 6px rgba(82,196,26,.18)}
.btn-sm{border-radius:8px}

/* ---- Ô nhập ---- */
.input,.select,.textarea{border-radius:9px;padding:8px 12px;border-color:#dbe4ee}

/* ---- Bảng ---- */
.table{border-radius:14px;border-color:#e8eef5}
.table th{background:#f7fafd;text-transform:uppercase;font-size:11.5px;letter-spacing:.05em;color:#64748b}

/* ---- Badge / pill bo tròn ---- */
.badge{border-radius:999px;padding:2px 11px}
.pill{border-radius:999px}

/* ---- Modal bo tròn hơn ---- */
.ym{border-radius:16px}
.ym-head{border-radius:16px 16px 0 0}

/* nút nghe phát âm trên flashcard */
.flash-face .fc-spk{position:absolute;right:14px;bottom:12px;width:42px;height:42px;border:0;border-radius:50%;background:var(--primary-l);font-size:18px;cursor:pointer;transition:.15s}
.flash-face .fc-spk:hover{background:var(--primary);}

/* chuông thông báo */
.bell{position:relative;font-size:19px;text-decoration:none;padding:4px}
.bell-n{position:absolute;top:-3px;right:-5px;background:var(--red);color:#fff;font-size:10.5px;font-weight:700;border-radius:999px;padding:1px 5px;line-height:1.4}

/* khối tuỳ chọn nâng cao thu gọn */
.xopt-box{background:#fff;border:1px dashed var(--line2);border-radius:14px;padding:14px 18px}
.xopt-box>summary{cursor:pointer;font-weight:700;color:var(--muted2)}
.xopt-box>summary:hover{color:var(--primary)}
.xopt-box[open]{border-style:solid;border-color:var(--line)}

.xopt-toggle{display:flex;align-items:center;gap:8px;width:100%;text-align:left;border:0;background:none;cursor:pointer;font-weight:700;color:var(--muted2);font-size:14px;font-family:inherit;padding:2px 0}
.xopt-toggle:hover{color:var(--primary)}
.xopt-toggle .car{margin-left:auto}

/* ===== Lively v1 — hiệu ứng trẻ trung (tôn trọng reduced-motion) ===== */
@media (prefers-reduced-motion: no-preference){
  /* nội dung trang trượt-mờ vào */
  .content{animation:pageIn .35s ease both}
  @keyframes pageIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
  /* thẻ trong lưới xuất hiện so le */
  .grid>*{animation:cardIn .5s cubic-bezier(.2,.7,.3,1) both}
  .grid>*:nth-child(1){animation-delay:.02s}.grid>*:nth-child(2){animation-delay:.08s}
  .grid>*:nth-child(3){animation-delay:.14s}.grid>*:nth-child(4){animation-delay:.2s}
  .grid>*:nth-child(5){animation-delay:.26s}.grid>*:nth-child(6){animation-delay:.32s}
  @keyframes cardIn{from{opacity:0;transform:translateY(14px) scale(.98)}to{opacity:1;transform:none}}
  /* icon thẻ stat nhún khi hover */
  .stat:hover .ico{animation:wiggle .5s ease}
  @keyframes wiggle{0%,100%{transform:rotate(0)}25%{transform:rotate(-8deg) scale(1.12)}75%{transform:rotate(8deg) scale(1.12)}}
  /* nav item trượt nhẹ */
  .sidebar .nav-item{transition:all .18s ease}
  .sidebar .nav-item:hover{transform:translateX(4px)}
  /* nút: vệt sáng quét qua khi hover */
  .btn{position:relative;overflow:hidden}
  .btn::after{content:"";position:absolute;top:0;left:-80%;width:50%;height:100%;background:linear-gradient(100deg,transparent,rgba(255,255,255,.35),transparent);transform:skewX(-20deg)}
  .btn:hover::after{animation:shine .6s ease}
  @keyframes shine{to{left:130%}}
  /* flashcard nghiêng nhẹ theo hover */
  .flashcard:hover{transform:translateY(-4px)}
  .flashcard{transition:transform .25s ease}
  /* bảng: hàng nhô nhẹ */
  .table tbody tr{transition:transform .12s ease}
  .table tbody tr:hover{transform:translateX(3px)}
  /* chuông rung khi có badge */
  .bell:has(.bell-n){animation:ring 2.4s ease infinite}
  @keyframes ring{0%,90%,100%{transform:rotate(0)}92%{transform:rotate(12deg)}94%{transform:rotate(-10deg)}96%{transform:rotate(6deg)}98%{transform:rotate(-4deg)}}
  /* huy hiệu pill pop khi hover */
  .pill{transition:transform .15s ease}
  .pill:hover{transform:scale(1.08)}
}
/* responsive bổ sung: form 2 cột về 1 cột sớm hơn */
@media(max-width:700px){.row{flex-direction:column}.page-head{flex-wrap:wrap}.content{padding:16px 14px}}

/* ===== Samio.fun UI v3 — "Quiz.com" (Nunito, nền kem, petrol + hồng, nút 3D bóng cứng) ===== */
:root{
  --primary:#d5456c; --primary-d:#9f314f; --primary-h:#e8537c;
  --primary-l:#fdeef3; --primary-l2:#fff6ee; --primary-border:#f4c3d2;
  --green:#00a76d; --green-d:#006b46; --green-l:#eef8e0; --green-b:#c6ea84;
  --red:#d54636; --red-d:#97271b; --red-l:#fdefed; --red-b:#f5bdb5;
  --amber:#df7921; --amber-l:#fff4e0;
  --petrol:#23616a; --petrol-d:#19444a; --petrol-dd:#031d21; --petrol-lt:#86cde2;
  --cyan:#00afc6; --yellow:#ffc679; --cream:#fffae6;
  --bg:#fffdf4; --card:#fff;
  --line:#f0e9d6; --line2:#e5dcba;
  --text:#133338; --muted:#7e938f; --muted2:#3e5a57;
  --radius:14px; --radius-lg:18px;
  --shadow:0 3px 0 rgba(19,51,56,.06);
  --shadow-lg:0 6px 0 rgba(19,51,56,.08);
}
body{font-family:'Nunito','Be Vietnam Pro',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);font-size:14.5px}
h1,h2,h3{font-weight:800}
a{color:var(--petrol)}
a:hover{color:var(--cyan)}

/* ---- Sidebar: petrol đậm đặc trưng Quiz.com ---- */
.sidebar{background:linear-gradient(180deg,#19444a 0%,#0e3136 55%,#031d21 100%);box-shadow:none;border-right:0}
.sidebar .brand{border-bottom:1px solid rgba(255,250,230,.1)}
.nav-group{color:#6ea7b3;font-weight:800}
.sidebar .nav-item{color:#bfe0e5;font-weight:700;border-radius:12px}
.sidebar .nav-item:hover{background:rgba(255,250,230,.09);color:var(--cream)}
.sidebar .nav-item.active{background:var(--primary);color:#fff;font-weight:800;box-shadow:0 4px 0 rgba(0,0,0,.28)}
.sidebar-foot{border-top:1px solid rgba(255,250,230,.1)}
.nav::-webkit-scrollbar-thumb{background:rgba(255,250,230,.18)}

/* ---- Topbar: kem ấm ---- */
.topbar{background:rgba(255,253,244,.92);backdrop-filter:blur(10px);border-bottom:2px solid var(--line)}
.topbar-title{font-weight:900;color:var(--petrol-d)}
.user-chip:hover{background:#fff3da}
.avatar{background:linear-gradient(135deg,var(--primary),var(--amber));box-shadow:0 3px 0 rgba(159,49,79,.35)}
.hamb{color:var(--petrol-d)}
.topsearch input{background:#fbf6e7;border:2px solid var(--line2);font-weight:600;color:var(--text)}
.topsearch input:focus{border-color:var(--cyan);background:#fff;box-shadow:0 0 0 4px rgba(0,175,198,.14)}

/* ---- Thẻ / bảng: viền 2px + bóng cứng ---- */
.card{border:2px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow)}
.stat{border:2px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow)}
.stat:hover{transform:translateY(-3px);box-shadow:0 6px 0 rgba(19,51,56,.08)}
.stat .num{font-weight:900;color:var(--petrol-d)}
.stat .ico{background:#fff1d6;border-radius:14px}
.card-hover:hover{transform:translateY(-3px);box-shadow:0 6px 0 rgba(19,51,56,.08)}
.table{border:2px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow)}
.table th{background:#fbf6e7;color:var(--muted2);font-weight:800}
.table th,.table td{border-bottom-color:var(--line)}
.table tbody tr:nth-child(even) td{background:#fffcf0}
.table tbody tr:hover td{background:#fff6ee}

/* ---- Nút: 3D nhấn lún kiểu Quiz.com ---- */
.btn{border:0;border-radius:14px;font-weight:800;padding:9px 18px;background:var(--primary);color:#fff;box-shadow:0 4px 0 var(--primary-d);transition:background .15s,transform .08s,box-shadow .08s}
.btn:hover{transform:none;background:var(--primary-h);box-shadow:0 4px 0 var(--primary-d)}
.btn:active{transform:translateY(4px);box-shadow:0 0 0 var(--primary-d)}
.btn-ghost{background:#fff;color:var(--text);border:2px solid var(--line2);box-shadow:0 4px 0 rgba(19,51,56,.08);padding:7px 16px}
.btn-ghost:hover{background:#fff;color:var(--petrol);border-color:var(--petrol-lt);box-shadow:0 4px 0 rgba(19,51,56,.08)}
.btn-ghost:active{transform:translateY(4px);box-shadow:0 0 0 rgba(19,51,56,.08)}
.btn-danger{background:var(--red);box-shadow:0 4px 0 var(--red-d)}
.btn-danger:hover{background:#e25949;box-shadow:0 4px 0 var(--red-d)}
.btn-danger:active{box-shadow:0 0 0 var(--red-d)}
.btn-success{background:var(--green);box-shadow:0 4px 0 var(--green-d)}
.btn-success:hover{background:#0cb87c;box-shadow:0 4px 0 var(--green-d)}
.btn-success:active{box-shadow:0 0 0 var(--green-d)}
.btn-sm{padding:4px 13px;border-radius:11px;box-shadow:0 3px 0 var(--primary-d)}
.btn-sm.btn-ghost{box-shadow:0 3px 0 rgba(19,51,56,.08)}
.btn-sm:active{transform:translateY(3px)}
.btn[disabled]{opacity:.6}

/* ---- Ô nhập ---- */
.input,.select,.textarea{border:2px solid var(--line2);border-radius:12px;padding:8px 12px;font-weight:600;color:var(--text)}
.input:focus,.select:focus,.textarea:focus{border-color:var(--cyan);box-shadow:0 0 0 4px rgba(0,175,198,.13)}
.form-row label{font-weight:800}

/* ---- Badge / pill / alert ---- */
.badge{font-weight:800;border-width:2px}
.pill{border:2px solid var(--line);background:#fffcf0;font-weight:700;color:var(--muted2)}
.alert{border-width:2px;border-radius:14px;font-weight:700}
.alert-info{background:#e9f7fa;color:#16586a;border-color:#abe2ec}

/* ---- Câu hỏi / đáp án: ô 2px nhấn được ---- */
.q-card{border:2px solid var(--line);border-radius:var(--radius-lg)}
.q-num{background:var(--petrol);border-radius:10px;font-weight:800}
.opt{border:2px solid var(--line2);border-radius:14px;font-weight:700;box-shadow:0 3px 0 rgba(19,51,56,.06);transition:all .12s}
.opt:hover{background:#f2fbfd;border-color:var(--cyan);transform:translateY(-2px);box-shadow:0 5px 0 rgba(0,175,198,.18)}
.opt.correct{background:var(--green-l);border-color:var(--green-b);box-shadow:0 3px 0 rgba(0,167,109,.25)}
.opt.wrong{background:var(--red-l);border-color:var(--red-b);box-shadow:0 3px 0 rgba(213,70,54,.2)}
.opt input{accent-color:var(--petrol)}
.result-score .big{color:var(--primary);font-weight:900}
.qb-item{border:2px solid var(--line);border-radius:var(--radius-lg)}
.qtbtn{border:2px solid var(--line2);border-radius:12px;font-weight:700;box-shadow:0 3px 0 rgba(19,51,56,.06)}
.qtbtn:hover{border-color:var(--cyan);color:var(--petrol);background:#f2fbfd}
.qtbtn:active{transform:translateY(3px);box-shadow:0 0 0 rgba(19,51,56,.06)}
.sec-title{color:var(--petrol-d);border-bottom:2px solid var(--line);font-weight:800}

/* ---- Tabs ---- */
.tab{font-weight:800;color:var(--muted)}
.tab:hover{color:var(--petrol)}
.tab.active{color:var(--primary);border-bottom-color:var(--primary)}

/* ---- Flashcard: thẻ kem nghiêng nhẹ ---- */
.flash-face{border:2px solid var(--line);border-radius:22px;box-shadow:0 8px 0 rgba(19,51,56,.07)}
.flash-back{background:#fff4dc}
.flash-face .big{font-weight:900;color:var(--petrol-d)}
.flash-face .fc-spk{background:var(--yellow);box-shadow:0 3px 0 #df7921}
.flash-face .fc-spk:hover{background:#ffb74d}
.flashcard:hover{transform:translateY(-4px) rotate(-1.2deg)}

/* ---- Modal / khối phụ ---- */
.ym{border-radius:20px;border:2px solid var(--line)}
.ym-head{border-bottom:2px solid var(--line);font-weight:800}
.ym-foot{border-top:2px solid var(--line)}
.xopt-box{border:2px dashed var(--line2);border-radius:16px;background:#fffcf0}
.empty .big{filter:saturate(1.15)}
.auth-wrap{background:linear-gradient(160deg,#fffdf4 0%,#fdeef3 55%,#e9f7fa 100%)}
.rt-tools{background:#fbf6e7;border:2px solid var(--line2);border-bottom:0}
.rt-ed{border:2px solid var(--line2);border-top:0}
.rt-ed:focus{border-color:var(--cyan);box-shadow:inset 0 0 0 1px var(--cyan)}
.rt-tools button{border:1px solid var(--line2);border-radius:8px}
.rt-tools button:hover{border-color:var(--cyan);color:var(--petrol)}

/* focus ring đồng bộ cyan */
.btn:focus-visible,.tab:focus-visible,.nav-item:focus-visible,.input:focus-visible,.select:focus-visible,.textarea:focus-visible{outline:3px solid rgba(0,175,198,.55);outline-offset:2px}

/* spinner theo màu mới */
.spin{border-color:rgba(213,69,108,.25);border-top-color:var(--primary)}

/* ---- Badge danh tính (mô hình kép): Khách + gói FREE/PRO ---- */
.badge-guest{background:#fff4dc;color:#7c4a00;border-color:#ffe2b8}
.badge-plan-free{background:var(--green-l);color:var(--green-d);border-color:var(--green-b)}
.badge-plan-pro{background:var(--primary-l);color:var(--primary-d);border-color:var(--primary-border)}

/* mobile: chặn tràn ngang (chỉ trên body — KHÔNG đặt trên <html> vì làm kẹt cuộn dọc trên iOS/Android) */
body{overflow-x:clip}
@media(max-width:560px){.content{padding:14px 12px}}

/* ===== Thanh điều hướng đáy cho HỌC VIÊN trên điện thoại ===== */
.mbar{display:none}
@media(max-width:860px){
  .mbar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:60;background:#fff;border-top:1px solid var(--line,#e6e9f0);box-shadow:0 -3px 14px rgba(20,30,60,.08);padding-bottom:env(safe-area-inset-bottom)}
  .mbar a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;padding:8px 2px;min-height:54px;color:#8a93a6;font-size:10.5px;font-weight:600;text-decoration:none;-webkit-tap-highlight-color:transparent;transition:color .15s}
  .mbar a i{font-size:22px;line-height:1}
  .mbar a.on{color:var(--primary,#0a8fdc)}
  .mbar a:active{background:rgba(0,0,0,.05)}
  .content{padding-bottom:76px}
}

/* ===== Cảm giác app native trên điện thoại ===== */
@media(max-width:860px){
  body{overscroll-behavior-y:contain}                /* chặn pull-to-refresh / overscroll glow */
  .topbar,.mbar,.sidebar,.btn,button,a,.hamb,.bell{-webkit-tap-highlight-color:transparent}
  .topbar,.mbar,.sidebar{user-select:none;-webkit-user-select:none}
  /* Bottom nav kiểu Material 3: viên chỉ báo sau icon khi active */
  .mbar a i{padding:5px 18px;border-radius:16px;transition:background .2s,color .15s}
  .mbar a.on i{background:rgba(0,82,204,.14)}
  .mbar a.on{font-weight:700}
}

/* ===== Mobile trang làm bài tập (≤600): tràn rộng, ô to, mọi kiểu câu vừa màn hình ===== */
@media(max-width:600px){
  .play-wrap{padding:0 10px 78px}                 /* tràn rộng hơn */
  .play-main{max-width:none}
  .q-card{padding:16px 13px;border-radius:14px;margin-bottom:14px}
  .q-head b{font-size:16px;line-height:1.4}
  /* Nối (match): xếp dọc từng cặp */
  .match-row{flex-direction:column;align-items:stretch;gap:6px}
  .match-row > span{display:none}
  .match-row > div{font-weight:700}
  .match-row select,.match-row .select{width:100%}
  /* Sắp xếp (order) */
  .opt-row{gap:10px}
  .opt-row select,.opt-row .select{flex:1;min-width:0}
  /* Chọn 1 / nhiều / đúng-sai: ô to, full bề ngang, dễ chạm */
  .opt{padding:14px 15px;gap:12px;border-radius:12px}
  .opt input{width:22px;height:22px;flex-shrink:0}
  /* Ô nhập (điền từ) + dropdown: cao 48px, chữ 16px (không zoom iOS) */
  .q-card .input,.q-card .select,.q-card .textarea{font-size:16px;padding:12px 14px;min-height:48px}
}

/* ===================== DARK MODE — component nền dùng chung (mọi trang nạp app.css) ===================== */
html.theme-dark{
  --bg:#0f1724; --card:#1a2536;
  --text:#dfe5ef; --muted:#7e8ca3; --muted2:#a9b4c7;
  --line:rgba(255,255,255,.085); --line2:#33415a;
  --primary-l:#16263e; --primary-l2:#121d30;
  --shadow:0 1px 3px rgba(0,0,0,.45); --shadow-lg:0 14px 26px -12px rgba(0,0,0,.6);
}
html.theme-dark body{background:var(--bg);color:var(--text)}
html.theme-dark .topbar{background:#131c2b;border-bottom-color:var(--line)}
html.theme-dark .stat,html.theme-dark .card,html.theme-dark .table,html.theme-dark .q-card,html.theme-dark .qb-item,
html.theme-dark .auth-card,html.theme-dark .ym,html.theme-dark .flash-face,html.theme-dark .xopt-box,html.theme-dark .qb-card{background:var(--card);color:var(--text);border-color:var(--line)}
html.theme-dark .table th{background:#131c2b;color:var(--muted2)}
html.theme-dark .table tbody tr:nth-child(even) td{background:#1e2a3d}
html.theme-dark .table td,html.theme-dark .table th{border-color:var(--line)}
html.theme-dark .input,html.theme-dark .select,html.theme-dark .textarea,html.theme-dark .rt-ed{background:#131c2b;color:var(--text);border-color:var(--line2)}
html.theme-dark .input::placeholder,html.theme-dark .textarea::placeholder{color:var(--muted)}
html.theme-dark select option{background:#131c2b;color:var(--text)}
html.theme-dark .pill{background:#222d40;color:var(--muted2);border-color:var(--line)}
html.theme-dark .btn-ghost,html.theme-dark .qtbtn,html.theme-dark .rt-tools,html.theme-dark .rt-tools button{background:#1e2a3d;color:var(--text);border-color:var(--line2)}
html.theme-dark .btn-ghost:hover{background:#222d40;color:#5aa2ff;border-color:var(--primary)}
html.theme-dark a{color:#5aa2ff}
html.theme-dark h1,html.theme-dark h2,html.theme-dark h3,html.theme-dark h4{color:var(--text)}
html.theme-dark .muted,html.theme-dark .muted2{color:var(--muted)}
html.theme-dark hr{border-color:var(--line)}
html.theme-dark code,html.theme-dark pre,html.theme-dark .codebox input{background:#0b1320;color:#cdd6e4;border-color:var(--line2)}