/* V0.19 age-first discovery and persistent grade context. */
:root{
  --g19-ink:#17233f;
  --g19-blue:#356ff6;
  --g19-purple:#7657e8;
  --g19-pink:#ed4f91;
  --g19-green:#19a872;
  --g19-yellow:#ffd648;
  --g19-line:#d9e2f0;
  --g19-muted:#68758d;
}

/* The grade switch is the first, always-visible navigation block. */
header .nav-links .grade-switch-link{
  --nav-accent:#e2a900!important;
  --nav-tint:#fff4bd!important;
  min-width:max-content!important;
  font-weight:900!important;
}
header .nav-links .grade-switch-link::before{display:none!important}
header .grade-switch-icon{font-size:15px;line-height:1}
header .grade-switch-label{white-space:nowrap}
header .nav-links a:nth-child(2){--nav-accent:var(--blue);--nav-tint:var(--blue2)}
header .nav-links a:nth-child(3){--nav-accent:var(--green);--nav-tint:var(--green2)}
header .nav-links a:nth-child(4){--nav-accent:var(--pink);--nav-tint:var(--pink2)}
header .nav-links a:nth-child(5){--nav-accent:var(--orange);--nav-tint:var(--yellow2)}
header .nav-links a:nth-child(6){--nav-accent:var(--purple);--nav-tint:var(--purple2)}

.selected-grade-context{
  position:relative;z-index:2;display:flex;align-items:center;gap:12px;
  margin:0 0 13px;padding:13px 15px;border:2px solid rgba(53,111,246,.2);
  border-radius:18px;background:linear-gradient(135deg,#edf4ff,#fff8d9 58%,#fff);
  box-shadow:0 12px 28px rgba(23,35,63,.07);
}
.selected-grade-context-icon{
  width:44px;height:44px;display:grid;place-items:center;flex:none;border:2px solid var(--g19-ink);
  border-radius:14px;background:var(--g19-yellow);font-size:23px;box-shadow:3px 3px 0 rgba(23,35,63,.18);
}
.selected-grade-context-copy{min-width:0;display:grid;gap:1px;flex:1}
.selected-grade-context-copy small{color:var(--g19-muted);font-size:11px;font-weight:900}
.selected-grade-context-copy strong{font-family:'Mali',sans-serif;font-size:18px;color:var(--g19-ink)}
.selected-grade-context .btn{flex:none}

/* Standalone required picker. */
.grade-choice-page *{box-sizing:border-box}
.grade-choice-page{
  margin:0;min-width:0;min-height:100vh;min-height:100dvh;overflow-x:hidden;
  color:var(--g19-ink);font-family:'IBM Plex Sans Thai',system-ui,sans-serif;
  background:
    radial-gradient(circle at 8% 10%,rgba(255,214,72,.45),transparent 24%),
    radial-gradient(circle at 93% 12%,rgba(237,79,145,.22),transparent 25%),
    radial-gradient(circle at 18% 92%,rgba(53,111,246,.18),transparent 29%),
    linear-gradient(135deg,#fff9e9,#eef7ff 53%,#fff2f8);
}
.grade-choice-page button,.grade-choice-page input{font:inherit}
.grade-choice-page a{color:inherit;text-decoration:none}
.grade-choice-page :where(a,button):focus-visible{outline:4px solid rgba(53,111,246,.65);outline-offset:4px}
.grade-skip{
  position:fixed;left:18px;top:12px;z-index:20;padding:10px 14px;border-radius:12px;
  background:#fff;box-shadow:0 12px 30px rgba(23,35,63,.15);font-weight:900;transform:translateY(-160%);
}
.grade-skip:focus{transform:none}
.grade-gate{
  position:relative;isolation:isolate;min-height:100vh;min-height:100dvh;display:grid;place-items:center;
  padding:max(26px,env(safe-area-inset-top)) max(18px,env(safe-area-inset-right)) max(26px,env(safe-area-inset-bottom)) max(18px,env(safe-area-inset-left));
}
.grade-gate::before{
  content:"";position:fixed;inset:0;z-index:-2;opacity:.32;
  background-image:linear-gradient(rgba(23,35,63,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(23,35,63,.05) 1px,transparent 1px);
  background-size:34px 34px;mask-image:linear-gradient(#000,transparent 92%);
}
.grade-orb{position:fixed;z-index:-1;border-radius:50%;filter:blur(2px);pointer-events:none;animation:gradeFloat 7s ease-in-out infinite}
.grade-orb-one{width:210px;height:210px;left:-70px;top:24%;background:rgba(255,214,72,.34)}
.grade-orb-two{width:260px;height:260px;right:-90px;bottom:12%;background:rgba(118,87,232,.18);animation-delay:-3s}
@keyframes gradeFloat{50%{transform:translateY(-14px) scale(1.04)}}

.grade-picker-shell{
  width:min(1040px,100%);padding:22px clamp(20px,4vw,46px) 20px;border:3px solid var(--g19-ink);
  border-radius:38px;background:rgba(255,255,255,.91);box-shadow:0 34px 100px rgba(23,35,63,.16),10px 10px 0 rgba(23,35,63,.92);
  backdrop-filter:blur(20px) saturate(145%);
}
.grade-picker-head{text-align:center;position:relative;padding:4px 116px 14px}
.grade-brand{
  position:absolute;left:0;top:2px;display:inline-flex;align-items:center;gap:7px;
  font-family:'Mali',sans-serif;font-size:18px;font-weight:700;
}
.grade-brand span{width:38px;height:38px;display:grid;place-items:center;border:2px solid var(--g19-ink);border-radius:13px;background:var(--g19-yellow);box-shadow:3px 3px 0 var(--g19-ink)}
.grade-brand b{color:var(--g19-pink)}
.grade-version{position:absolute;right:0;top:3px;padding:7px 10px;border:1px solid var(--g19-line);border-radius:999px;background:#f7f9fd;color:var(--g19-muted);font-size:11px;font-weight:900}
.grade-hero-icon{width:68px;height:68px;margin:0 auto 7px;display:grid;place-items:center;border:3px solid var(--g19-ink);border-radius:22px;background:linear-gradient(135deg,#dce9ff,#fff);box-shadow:6px 6px 0 rgba(53,111,246,.22);font-size:36px;transform:rotate(-3deg)}
.grade-eyebrow{display:inline-flex;margin:4px 0 5px;padding:5px 11px;border-radius:999px;background:#fff1b0;color:#765a00;font-size:11px;font-weight:900}
.grade-picker-head h1{margin:0;font-family:'Mali',sans-serif;font-size:clamp(29px,4vw,46px);line-height:1.15;letter-spacing:-.5px}
.grade-picker-head>p:not(.grade-eyebrow){max-width:650px;margin:9px auto 0;color:var(--g19-muted);font-weight:700;line-height:1.65}
.grade-current-note{width:max-content;max-width:100%;margin:10px auto 0;padding:7px 12px;border-radius:999px;background:#e8fff5;color:#08784c;font-size:12px;font-weight:800}
.grade-flash-stack{display:grid;gap:7px;margin:4px 0 12px}
.grade-flash{padding:10px 13px;border:1px solid var(--g19-line);border-radius:13px;background:#edf4ff;text-align:center;font-size:12px;font-weight:900}
.grade-flash.error{border-color:#f1b3c8;background:#ffe9f0;color:#8f1744}
.grade-flash.warning{border-color:#eed680;background:#fff7d2;color:#715800}
.grade-flash.success{border-color:#a9dfc9;background:#e6fff5;color:#08784c}

.grade-picker-form{display:grid;gap:16px;margin-top:4px}
.grade-fieldset{min-width:0;margin:0;padding:13px 14px 15px;border:1px solid var(--g19-line);border-radius:22px;background:rgba(248,250,254,.82)}
.grade-fieldset legend{padding:0 9px;color:#526079;font-family:'Mali',sans-serif;font-size:14px;font-weight:700}
.grade-grid{display:grid;gap:11px}
.grade-grid-kindergarten{grid-template-columns:1fr}
.grade-grid-primary{grid-template-columns:repeat(3,minmax(0,1fr))}
.grade-choice{
  position:relative;min-width:0;min-height:98px;display:grid;grid-template-columns:46px minmax(0,1fr) auto;
  grid-template-rows:auto auto;align-items:center;gap:2px 10px;padding:12px 13px;
  border:2px solid var(--g19-ink);border-radius:18px;color:var(--g19-ink);background:linear-gradient(145deg,#fff,#edf4ff);
  box-shadow:4px 4px 0 rgba(23,35,63,.16);text-align:left;cursor:pointer;overflow:hidden;
  transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease;
}
.grade-choice:nth-child(2){background:linear-gradient(145deg,#fff,#fff3c8)}
.grade-choice:nth-child(3){background:linear-gradient(145deg,#fff,#ffe8f1)}
.grade-choice:nth-child(4){background:linear-gradient(145deg,#fff,#e4fff4)}
.grade-choice:nth-child(5){background:linear-gradient(145deg,#fff,#efe9ff)}
.grade-choice:nth-child(6){background:linear-gradient(145deg,#fff,#ffeedf)}
.grade-choice::after{content:"";position:absolute;right:-28px;top:-32px;width:86px;height:86px;border-radius:50%;background:rgba(53,111,246,.08);pointer-events:none}
.grade-choice:hover{transform:translateY(-3px);border-color:var(--g19-blue);box-shadow:5px 8px 0 rgba(53,111,246,.17)}
.grade-choice.is-current{border-color:var(--g19-green);box-shadow:inset 0 0 0 3px #fff,5px 5px 0 var(--g19-green)}
.grade-choice.is-current::before{content:"✓ กำลังใช้";position:absolute;right:9px;top:8px;z-index:2;padding:3px 7px;border-radius:999px;background:var(--g19-green);color:#fff;font-size:9px;font-weight:900}
.grade-choice-icon{grid-row:1/3;width:44px;height:44px;display:grid;place-items:center;border:1px solid rgba(23,35,63,.13);border-radius:14px;background:rgba(255,255,255,.84);font-size:24px}
.grade-choice-copy{min-width:0;display:grid;gap:1px}
.grade-choice-copy strong{font-family:'Mali',sans-serif;font-size:18px;line-height:1.15}
.grade-choice-copy small{color:var(--g19-muted);font-size:11px;font-weight:800}
.grade-choice-count{align-self:start;justify-self:start;grid-column:2;padding:3px 7px;border-radius:999px;background:rgba(23,35,63,.06);color:#59657a;font-size:10px;font-weight:900;white-space:nowrap}
.grade-choice-arrow{grid-column:3;grid-row:1/3;align-self:center;position:relative;z-index:1;font-size:20px;font-weight:900;color:var(--g19-blue)}
.grade-choice-kindergarten{min-height:86px;grid-template-columns:58px minmax(0,1fr) auto auto;padding:13px 18px;background:linear-gradient(135deg,#fff8ce,#fff,#e8f3ff)}
.grade-choice-kindergarten .grade-choice-icon{width:54px;height:54px;font-size:30px}
.grade-choice-kindergarten .grade-choice-count{grid-column:3;grid-row:1/3;align-self:center;padding:6px 10px;background:#fff0aa;color:#775c00}
.grade-choice-kindergarten .grade-choice-arrow{grid-column:4}

.grade-picker-empty{padding:28px;border:2px dashed #c4cede;border-radius:20px;text-align:center;color:var(--g19-muted);font-weight:900}
.grade-picker-footer{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:16px;color:#7a8599;font-size:11px;font-weight:800}
.grade-picker-footer a{color:var(--g19-blue);font-weight:900;text-decoration:underline;text-underline-offset:3px}

@media(max-width:820px){
  .grade-picker-shell{padding:18px 18px 17px;border-radius:30px;box-shadow:0 26px 70px rgba(23,35,63,.15),7px 7px 0 rgba(23,35,63,.9)}
  .grade-picker-head{padding-inline:0;padding-top:50px}
  .grade-brand{top:0}.grade-version{top:4px}
  .grade-grid-primary{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media(max-width:560px){
  header .nav-links .grade-switch-label{font-size:11px}
  .selected-grade-context{align-items:flex-start;flex-wrap:wrap;padding:12px}
  .selected-grade-context-copy{width:calc(100% - 58px)}
  .selected-grade-context .btn{width:100%}
  .grade-gate{align-items:start;padding:8px 7px max(14px,env(safe-area-inset-bottom))}
  .grade-picker-shell{padding:14px 11px 14px;border-width:2px;border-radius:24px;box-shadow:4px 5px 0 rgba(23,35,63,.9)}
  .grade-picker-head{padding-top:45px;padding-bottom:8px}
  .grade-brand{font-size:16px}.grade-brand span{width:34px;height:34px}
  .grade-version{font-size:10px;padding:5px 8px}
  .grade-hero-icon{width:58px;height:58px;border-radius:18px;font-size:30px}
  .grade-picker-head h1{font-size:27px}
  .grade-picker-head>p:not(.grade-eyebrow){font-size:13px;line-height:1.55}
  .grade-picker-form{gap:11px}
  .grade-fieldset{padding:10px 8px 11px;border-radius:18px}
  .grade-grid{gap:8px}
  .grade-choice{min-height:92px;grid-template-columns:38px minmax(0,1fr);padding:10px 9px;border-radius:15px}
  .grade-choice-icon{width:37px;height:37px;border-radius:11px;font-size:20px}
  .grade-choice-copy strong{font-size:16px}.grade-choice-copy small{font-size:10px}
  .grade-choice-count{grid-column:2;font-size:9px}
  .grade-choice-arrow{display:none}
  .grade-choice.is-current::before{right:5px;top:5px;font-size:8px}
  .grade-choice-kindergarten{min-height:82px;grid-template-columns:46px minmax(0,1fr);padding:10px 11px}
  .grade-choice-kindergarten .grade-choice-icon{width:44px;height:44px;font-size:25px}
  .grade-choice-kindergarten .grade-choice-count{grid-column:2;grid-row:2;align-self:start;padding:4px 7px;font-size:9px}
  .grade-picker-footer{align-items:flex-start;flex-direction:column;margin-top:12px;padding-inline:4px}
}

@media(max-width:380px){
  .grade-grid-primary{grid-template-columns:1fr}
  .grade-choice{min-height:76px}
}

@media(prefers-reduced-motion:reduce){
  .grade-orb{animation:none!important}
  .grade-choice{transition:none!important}
}