:root{
  --bg:#FBFCFB; --tint:#EEF4F2; --surface:#FFFFFF; --ink:#15232A; --ink-2:#3F5057; --muted:#687A80; --line:#DCE3E1;
  --accent:#0F7B61; --accent-2:#0B6450; --accent-soft:#DDF0EA; --blue:#0B7FA8; --amber:#C98A12; --amber-soft:#FBEFD6;
  --bad:#B9333A; --good:#1E7F45;
  --display:"Lexend","Be Vietnam Pro",system-ui,sans-serif;
  --body:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --r:12px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 var(--body);-webkit-font-smoothing:antialiased}
img{max-width:100%}
a{color:var(--accent)}
h1,h2,h3{font-family:var(--display);line-height:1.2;margin:0;text-wrap:balance;letter-spacing:-.015em}
h1{font-size:clamp(2rem,4.6vw,3.2rem);font-weight:700}
h2{font-size:clamp(1.5rem,3vw,2.1rem);font-weight:600}
h3{font-size:1.1rem;font-weight:600}
p{margin:0}
.num{font-variant-numeric:tabular-nums}
.muted{color:var(--muted)} .small{font-size:.875rem}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:#fff;padding:8px 12px;border-radius:8px;z-index:50}
.skip:focus{left:8px}
:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 60%,transparent);outline-offset:2px}
.wrap{max-width:1160px;margin:0 auto;padding-inline:20px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:10px;padding:10px 18px;font:600 15px/1.2 var(--body);text-decoration:none;border:1.5px solid transparent;cursor:pointer;transition:background .15s,border-color .15s,transform .15s}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-2)}
.btn-ghost{border-color:var(--line);color:var(--ink);background:var(--surface)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-lg{padding:14px 22px;font-size:16px}
.btn-block{width:100%}
.btn:disabled{opacity:.6;cursor:progress}

/* Header */
.site-head{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.head-in{display:flex;align-items:center;gap:16px;min-height:66px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.logo b{font-family:var(--display);font-size:1.15rem;display:block;line-height:1.1}
.logo small{color:var(--muted);font-size:.75rem}
.menu{margin-left:auto;display:flex;align-items:center;gap:22px}
.menu a:not(.btn){color:var(--ink-2);text-decoration:none;font-weight:500;font-size:15px}
.menu a:not(.btn):hover{color:var(--accent)}
.menu-btn{display:none;margin-left:auto;border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:8px 14px;font:600 14px var(--body);color:var(--ink)}
@media (max-width:820px){
  .menu-btn{display:block}
  .menu{display:none;position:absolute;left:0;right:0;top:100%;background:var(--surface);flex-direction:column;align-items:stretch;gap:0;padding:8px 20px 16px;border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(21,35,42,.08)}
  .menu.open{display:flex}
  .menu a:not(.btn){padding:12px 0;border-bottom:1px solid var(--line)}
  .menu .btn{margin-top:12px}
}

/* Hero */
.hero{padding:56px 0 40px;background:radial-gradient(1200px 400px at 85% 0%,var(--accent-soft),transparent 70%),var(--bg)}
.hero-in{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.eyebrow{font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:14px}
.lead{font-size:1.1rem;color:var(--ink-2);margin-top:18px;max-width:60ch}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.hotline{margin-top:18px;color:var(--muted)}
.hotline a{color:var(--ink);text-decoration:none}
.hero-art{display:grid;place-items:center}
.hero-art canvas{width:100%;max-width:440px;height:auto;aspect-ratio:1;border-radius:50%}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin-top:48px}
.stat{background:var(--surface);padding:18px 20px}
.stat b{display:block;font-family:var(--display);font-size:1.7rem;color:var(--accent);font-variant-numeric:tabular-nums}
.stat span{color:var(--ink-2);font-size:.92rem}
@media (max-width:820px){.hero-in{grid-template-columns:minmax(0,1fr)}.hero-art{order:-1}.hero-art canvas{max-width:240px}.stats{grid-template-columns:repeat(2,1fr)}.hero{padding-top:32px}}

/* Sections */
.section{padding:72px 0}
.section-tint{background:var(--tint)}
.section-ink{background:#12302A;color:#E6F0EC}
.section-ink h2{color:#fff}
.sec-head{max-width:720px;margin-bottom:32px}
.sec-head p{color:var(--ink-2);margin-top:10px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px;min-width:0}

/* Courses */
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}
.filters button{border:1px solid var(--line);background:var(--surface);border-radius:99px;padding:6px 14px;font:500 14px var(--body);color:var(--ink-2);cursor:pointer}
.filters button[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:#fff}
.courses{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(310px,100%),1fr));gap:18px}
.course{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px;display:flex;flex-direction:column;gap:12px}
.course[hidden]{display:none}
.course-top{display:flex;gap:6px;flex-wrap:wrap}
.tag{font-size:.75rem;font-weight:600;padding:3px 10px;border-radius:99px;background:var(--ink);color:#fff}
.tag-soft{background:var(--tint);color:var(--ink-2)}
.tag-new{background:var(--amber-soft);color:#8A5B06}
.course p{color:var(--ink-2);font-size:.95rem}
.course-meta{margin:0;display:grid;gap:8px;font-size:.9rem}
.course-meta div{display:grid;grid-template-columns:84px 1fr;gap:8px}
.course-meta dt{color:var(--muted)} .course-meta dd{margin:0;font-weight:500}
.course-foot{margin-top:auto;padding-top:14px;border-top:1px dashed var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.fee b{font-family:var(--display);font-size:1.25rem;font-variant-numeric:tabular-nums}
.fee span{color:var(--muted);font-size:.9rem;margin-left:4px}

/* Benefits */
.benefits{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.benefit{border-top:3px solid var(--accent);padding-top:16px}
.benefit:nth-child(2){border-color:var(--blue)} .benefit:nth-child(3){border-color:var(--amber)}
.benefit p{color:var(--ink-2);margin-top:8px;font-size:.95rem}
@media (max-width:900px){.benefits{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.benefits{grid-template-columns:1fr}}

/* Rooms */
.rooms{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:16px}
.room{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column}
.room-art{aspect-ratio:16/9;max-width:100%;background:var(--tint)}
.room-art svg{display:block;width:100%;height:100%}
.room-body{padding:16px;display:flex;flex-direction:column;gap:10px;flex:1}
.room-cap{color:var(--muted);font-size:.9rem}
.equip{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:6px}
.equip li{font-size:.78rem;background:var(--tint);border-radius:6px;padding:2px 8px;color:var(--ink-2)}
.room-price{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:auto}
.room-price div{display:flex;flex-direction:column}
.room-price span{font-size:.75rem;color:var(--muted)}
.room-price b{font-variant-numeric:tabular-nums}
.room-price small{color:var(--muted);font-size:.75rem}

/* Booking */
.booking{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:18px;margin-top:28px;align-items:start}
@media (max-width:960px){.booking{grid-template-columns:minmax(0,1fr)}}
.avail-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.avail-head select{flex:0 1 220px}
.week-nav{display:flex;align-items:center;gap:8px;margin-left:auto;font-size:.9rem;font-weight:500}
.icon-btn{width:34px;height:34px;border-radius:8px;border:1px solid var(--line);background:var(--surface);font-size:18px;line-height:1;cursor:pointer;color:var(--ink)}
.icon-btn:disabled{opacity:.4;cursor:default}
.avail-grid-wrap{overflow-x:auto}
.avail-grid{display:grid;grid-template-columns:52px repeat(7,minmax(54px,1fr));gap:3px;min-width:470px;font-size:.78rem}
.avail-grid .dh{text-align:center;font-weight:600;padding:4px 0;line-height:1.25}
.avail-grid .dh small{display:block;font-weight:400;color:var(--muted)}
.avail-grid .dh.today{color:var(--accent)}
.avail-grid .hh{color:var(--muted);text-align:right;padding-right:6px;font-variant-numeric:tabular-nums;align-self:center}
.cell{height:28px;border-radius:5px;border:1px solid transparent;background:var(--accent-soft);cursor:pointer;padding:0;font:inherit}
.cell.peak{box-shadow:inset 0 -3px 0 var(--amber)}
.cell:hover{border-color:var(--accent)}
.cell.sel{background:var(--accent);border-color:var(--accent)}
.cell.busy{background:#D5DCDA;cursor:not-allowed}
.cell.hold{background:repeating-linear-gradient(45deg,var(--amber-soft) 0 5px,#fff 5px 10px);border-color:#E4C57F;cursor:not-allowed}
.cell.past{background:#F1F3F2;cursor:not-allowed;box-shadow:none}
.avail-legend{display:flex;gap:16px;flex-wrap:wrap;margin-top:12px;font-size:.8rem;color:var(--ink-2)}
.avail-legend i{display:inline-block;width:14px;height:12px;border-radius:3px;margin-right:6px;vertical-align:-1px}
.lg-free{background:var(--accent-soft)} .lg-busy{background:#D5DCDA}
.lg-hold{background:repeating-linear-gradient(45deg,var(--amber-soft) 0 3px,#fff 3px 6px);border:1px solid #E4C57F}
.lg-peak{background:var(--accent-soft);box-shadow:inset 0 -3px 0 var(--amber)}

/* Forms */
.form{display:flex;flex-direction:column;gap:14px;color:var(--ink)}
.form h3{font-size:1.15rem}
.field{display:flex;flex-direction:column;gap:5px;min-width:0}
.field label{font-size:.85rem;font-weight:600;color:var(--ink-2)}
input,select,textarea{font:inherit;font-size:15px;color:var(--ink);background:var(--surface);border:1.5px solid var(--line);border-radius:9px;padding:10px 12px;width:100%;min-width:0}
input:focus,select:focus,textarea:focus{border-color:var(--accent);outline:none;box-shadow:0 0 0 3px var(--accent-soft)}
input[aria-invalid="true"]{border-color:var(--bad)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.row3{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:12px}
@media (max-width:520px){.row2{grid-template-columns:1fr}.row3{grid-template-columns:1fr 1fr}.row3 .field:first-child{grid-column:1/-1}}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.quote-box{background:var(--tint);border-radius:9px;padding:10px 14px;font-size:.92rem;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.quote-box:empty{display:none}
.quote-box b{font-variant-numeric:tabular-nums}
.form-msg{font-size:.92rem;min-height:1.2em}
.form-msg.ok{color:var(--good);font-weight:600}
.form-msg.err{color:var(--bad);font-weight:600}

/* Teachers & quotes */
.teachers{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(250px,100%),1fr));gap:18px}
.teacher{display:flex;gap:14px;align-items:flex-start}
.avatar{width:54px;height:54px;border-radius:50%;flex:none;display:grid;place-items:center;font:600 1.3rem var(--display);color:#fff;background:var(--accent)}
.teacher:nth-child(3n+2) .avatar{background:var(--blue)} .teacher:nth-child(3n) .avatar{background:var(--amber)}
.t-sub{font-size:.85rem;color:var(--accent);font-weight:600}
.teacher p{color:var(--ink-2);font-size:.92rem;margin-top:4px}
.quotes{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(280px,100%),1fr));gap:18px}
.quote{margin:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px;display:flex;flex-direction:column;gap:14px}
.quote blockquote{margin:0;font-size:1rem;line-height:1.65}
.quote blockquote::before{content:"“";font:700 2.4rem/0 var(--display);color:var(--accent);vertical-align:-.45em;margin-right:4px}
.quote figcaption{margin-top:auto;font-size:.9rem}
.quote figcaption b{display:block} .quote figcaption span{color:var(--muted)}

/* Signup */
.signup{display:grid;grid-template-columns:.9fr 1.1fr;gap:40px;align-items:start}
@media (max-width:900px){.signup{grid-template-columns:minmax(0,1fr)}}
.signup-text p{margin-top:12px;color:#BFD3CC;max-width:48ch}
.contact{margin:28px 0 0;display:grid;gap:14px}
.contact dt{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:#8FB3A7}
.contact dd{margin:2px 0 0;font-weight:500}
.contact a{color:#fff;text-decoration:none}
.contact a:hover{text-decoration:underline}

/* Footer */
.site-foot{background:#0D2420;color:#BFD3CC;padding:32px 0 96px;font-size:.92rem}
.foot-in{display:flex;gap:24px;justify-content:space-between;flex-wrap:wrap;align-items:flex-start}
.site-foot b{color:#fff}
.foot-links{display:flex;gap:18px;flex-wrap:wrap}
.site-foot a{color:#E6F0EC}
.site-foot .muted{color:#8FB3A7}

/* Floating contact */
.float-contact{position:fixed;right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));display:flex;flex-direction:column;gap:10px;z-index:30}
.fc{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;color:#fff;text-decoration:none;font:700 13px var(--body);box-shadow:0 6px 18px rgba(0,0,0,.2)}
.fc-zalo{background:#0068FF}
.fc-call{background:var(--accent)}
@media (prefers-reduced-motion:no-preference){.fc-call{animation:ring 2.4s infinite}@keyframes ring{0%,100%{box-shadow:0 0 0 0 color-mix(in srgb,var(--accent) 50%,transparent),0 6px 18px rgba(0,0,0,.2)}60%{box-shadow:0 0 0 14px transparent,0 6px 18px rgba(0,0,0,.2)}}}
@media (max-width:520px){.wrap{padding-inline:16px}.hero-cta .btn{flex:1 1 100%}.panel{padding:16px}.eyebrow{font-size:.72rem}}
body{overflow-x:clip}

/* Nút giáo viên điểm danh trên thanh menu */
.btn-teacher{border-color:var(--accent);color:var(--accent);background:var(--surface);padding:8px 14px;font-size:14px}
.btn-teacher:hover{background:var(--accent-soft)}
@media (max-width:820px){.menu .btn-teacher{margin-top:12px}}
.policy{margin:0;padding:10px 14px 10px 30px;background:var(--amber-soft);border-radius:9px;font-size:.88rem;color:var(--ink-2);display:flex;flex-direction:column;gap:3px}