/* ═══════════════════════════════════════════════════════════════
   TKA SD — Tema "Galaksi Ceria"
   Futuristik (luar angkasa + neon) tapi tetap ramah anak:
   huruf bulat besar, warna permen, tombol tebal yang "bisa ditekan".
   Dipakai oleh semua halaman siswa & orang tua.
   ═══════════════════════════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=Fredoka:wght@400;500;600;700&family=Nunito:wght@500;700;800;900&display=swap');

:root{
  /* latar */
  --space-0:#0a0826; --space-1:#151049; --space-2:#231a6b;
  /* aksen neon permen */
  --cyan:#3de0ff;  --cyan-d:#0aa5c8;
  --pink:#ff5fa2;  --pink-d:#d42f78;
  --violet:#8b5cff;--violet-d:#5b32d6;
  --lime:#7dff6b;  --lime-d:#2fbf4a;
  --sun:#ffd23f;   --sun-d:#e09a00;
  --orange:#ff8a3d;--orange-d:#d65a12;
  --red:#ff5d6c;   --red-d:#c92a3c;
  /* teks */
  --ink:#ffffff; --ink-2:rgba(235,232,255,.82); --ink-3:rgba(215,210,255,.58);
  /* kartu kaca */
  --glass:rgba(255,255,255,.075); --glass-2:rgba(255,255,255,.13);
  --line:rgba(255,255,255,.16);   --line-2:rgba(255,255,255,.28);
  --r-lg:28px; --r-md:20px; --r-sm:14px;
  --font-head:'Fredoka','Nunito',system-ui,sans-serif;
  --font-body:'Nunito','Fredoka',system-ui,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-body); color:var(--ink); min-height:100vh; overflow-x:hidden;
  background:var(--space-0);
}
h1,h2,h3,h4,.head{font-family:var(--font-head);font-weight:700;letter-spacing:.2px}
a{color:var(--cyan)}
button{font-family:inherit}

/* ── LATAR LUAR ANGKASA ─────────────────────────────────────── */
.space{position:fixed;inset:0;z-index:-2;overflow:hidden;pointer-events:none;
  background:
    radial-gradient(60vw 50vh at 12% 8%, rgba(139,92,255,.45), transparent 70%),
    radial-gradient(55vw 45vh at 92% 22%, rgba(255,95,162,.32), transparent 70%),
    radial-gradient(70vw 50vh at 50% 105%, rgba(61,224,255,.28), transparent 70%),
    linear-gradient(180deg,var(--space-0) 0%,var(--space-1) 55%,var(--space-2) 100%);
}
.space::before,.space::after{content:'';position:absolute;inset:-50%;
  background-image:
    radial-gradient(1.6px 1.6px at 20px 30px,#fff,transparent),
    radial-gradient(1.2px 1.2px at 90px 120px,#fff,transparent),
    radial-gradient(2px 2px at 160px 60px,#ffe9a8,transparent),
    radial-gradient(1.2px 1.2px at 230px 190px,#bdf3ff,transparent),
    radial-gradient(1.6px 1.6px at 300px 90px,#fff,transparent);
  background-size:320px 240px; opacity:.75; animation:starDrift 120s linear infinite}
.space::after{background-size:520px 380px;opacity:.45;animation-duration:200s;animation-direction:reverse}
@keyframes starDrift{to{transform:translate(160px,120px)}}

/* lantai grid neon (sentuhan futuristik) */
.grid-floor{position:fixed;left:-50%;right:-50%;bottom:-2px;height:38vh;z-index:-1;pointer-events:none;
  background:
    linear-gradient(rgba(61,224,255,.0),rgba(61,224,255,.0)),
    repeating-linear-gradient(90deg,rgba(61,224,255,.35) 0 2px,transparent 2px 70px),
    repeating-linear-gradient(0deg,rgba(255,95,162,.35) 0 2px,transparent 2px 46px);
  transform:perspective(320px) rotateX(62deg); transform-origin:bottom;
  -webkit-mask-image:linear-gradient(to top,#000 10%,transparent 85%);
          mask-image:linear-gradient(to top,#000 10%,transparent 85%);
  opacity:.55; animation:floorMove 3.5s linear infinite}
@keyframes floorMove{to{background-position:0 0,0 0,0 46px}}

/* stiker mengambang */
.floaty{position:fixed;z-index:-1;pointer-events:none;font-size:2.4rem;
  filter:drop-shadow(0 0 14px rgba(255,255,255,.35));animation:floaty 6s ease-in-out infinite alternate}
@keyframes floaty{from{transform:translateY(0) rotate(-6deg)}to{transform:translateY(-18px) rotate(8deg)}}

/* ── KARTU KACA ─────────────────────────────────────────────── */
.card{background:var(--glass);border:1.5px solid var(--line);border-radius:var(--r-lg);
  backdrop-filter:blur(18px) saturate(150%);-webkit-backdrop-filter:blur(18px) saturate(150%);
  box-shadow:0 18px 50px rgba(5,3,30,.45),inset 0 1px 0 rgba(255,255,255,.18)}
.card-sm{background:var(--glass);border:1.5px solid var(--line);border-radius:var(--r-md);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  box-shadow:0 10px 28px rgba(5,3,30,.35),inset 0 1px 0 rgba(255,255,255,.14)}
.card-hover{transition:transform .2s cubic-bezier(.34,1.56,.64,1),border-color .2s,background .2s}
.card-hover:hover{transform:translateY(-5px) scale(1.03);border-color:var(--line-2);background:var(--glass-2)}

/* bingkai pelangi neon */
.neon-border{position:relative}
.neon-border::before{content:'';position:absolute;inset:-1.5px;border-radius:inherit;padding:1.5px;
  background:linear-gradient(120deg,var(--cyan),var(--violet),var(--pink),var(--sun));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none}

/* ── TOMBOL 3D "BISA DITEKAN" ───────────────────────────────── */
.btn{--c1:var(--violet);--c2:var(--violet-d);--fg:#fff;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:none;cursor:pointer;text-decoration:none;user-select:none;
  font-family:var(--font-head);font-weight:600;font-size:1.05rem;color:var(--fg);
  padding:14px 22px;border-radius:18px;
  background:var(--c1);
  background-image:linear-gradient(180deg,rgba(255,255,255,.22),rgba(255,255,255,0) 55%);
  box-shadow:0 6px 0 var(--c2),0 12px 24px rgba(5,3,30,.45);
  transition:transform .12s,box-shadow .12s,filter .2s}
.btn:hover{filter:brightness(1.08);transform:translateY(-2px);
  box-shadow:0 8px 0 var(--c2),0 16px 30px rgba(5,3,30,.5)}
.btn:active{transform:translateY(5px);box-shadow:0 1px 0 var(--c2),0 6px 14px rgba(5,3,30,.4)}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}
.btn-block{width:100%}
.btn-sun   {--c1:var(--sun);   --c2:var(--sun-d);   --fg:#3a2300}
.btn-cyan  {--c1:var(--cyan);  --c2:var(--cyan-d);  --fg:#032a36}
.btn-pink  {--c1:var(--pink);  --c2:var(--pink-d)}
.btn-lime  {--c1:var(--lime);  --c2:var(--lime-d);  --fg:#0b3310}
.btn-orange{--c1:var(--orange);--c2:var(--orange-d)}
.btn-wa    {--c1:#25d366;      --c2:#128c4a}
.btn-ghost{background:rgba(255,255,255,.07);border:1.5px solid var(--line-2);color:var(--ink);
  box-shadow:none;font-family:var(--font-head);font-weight:600;border-radius:16px;padding:12px 18px;cursor:pointer;
  transition:background .2s,border-color .2s,transform .15s;display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none}
.btn-ghost:hover{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.45);transform:translateY(-2px)}
.btn-sm{padding:8px 14px;font-size:.85rem;border-radius:12px}

/* ── FORM ───────────────────────────────────────────────────── */
label.lbl,.lbl{display:block;font-family:var(--font-head);font-weight:600;font-size:.95rem;margin-bottom:8px;color:var(--ink)}
.field{width:100%;border:2px solid var(--line-2);border-radius:16px;padding:13px 15px;font-size:1rem;
  font-family:inherit;font-weight:700;outline:none;transition:.2s;background:rgba(10,8,38,.45);color:#fff}
.field::placeholder{color:var(--ink-3);font-weight:600}
.field:focus{border-color:var(--cyan);box-shadow:0 0 0 4px rgba(61,224,255,.2);background:rgba(10,8,38,.6)}
.field-valid{border-color:var(--lime)!important}
.field-invalid{border-color:var(--red)!important}
.hint{font-size:.78rem;color:var(--ink-3);margin-top:5px}

/* pilih kelas: planet-planet kecil */
.kelas-row{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.kelas-btn{position:relative;aspect-ratio:1/1.08;border-radius:20px;cursor:pointer;user-select:none;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:rgba(255,255,255,.07);border:2px solid var(--line-2);color:var(--ink-2);
  font-family:var(--font-head);font-weight:700;font-size:1.5rem;line-height:1;
  transition:transform .2s cubic-bezier(.34,1.56,.64,1),background .2s,border-color .2s,box-shadow .2s}
.kelas-btn .sub{font-size:.62rem;font-weight:600;color:var(--ink-3);margin-top:3px;font-family:var(--font-body)}
.kelas-btn:hover{transform:translateY(-4px) scale(1.06);border-color:var(--cyan);color:#fff}
.kelas-btn.selected{color:#fff;border-color:transparent;transform:translateY(-4px) scale(1.08);
  background:var(--kc,linear-gradient(135deg,var(--violet),var(--pink)));
  box-shadow:0 0 0 3px rgba(255,255,255,.85),0 10px 26px rgba(139,92,255,.55)}
.kelas-btn.selected .sub{color:rgba(255,255,255,.92)}
.kelas-btn[data-kelas="1"]{--kc:linear-gradient(135deg,#ff8a3d,#ff5fa2)}
.kelas-btn[data-kelas="2"]{--kc:linear-gradient(135deg,#ffd23f,#ff8a3d)}
.kelas-btn[data-kelas="3"]{--kc:linear-gradient(135deg,#2fbf4a,#3de0ff)}
.kelas-btn[data-kelas="4"]{--kc:linear-gradient(135deg,#3de0ff,#8b5cff)}
.kelas-btn[data-kelas="5"]{--kc:linear-gradient(135deg,#8b5cff,#ff5fa2)}

/* ── NOTIFIKASI ─────────────────────────────────────────────── */
.alert-err,.alert-ok{border-radius:16px;padding:12px 15px;font-size:.9rem;font-weight:700;margin-bottom:14px;display:none;line-height:1.5}
.alert-err{background:rgba(255,93,108,.16);border:1.5px solid rgba(255,93,108,.5);color:#ffc2c8}
.alert-ok{background:rgba(125,255,107,.12);border:1.5px solid rgba(125,255,107,.45);color:#d4ffcc}
.alert-err.show,.alert-ok.show{display:block}

.spinner{display:inline-block;width:18px;height:18px;border:3px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite;vertical-align:middle;margin-right:6px}
.spinner-sm{display:inline-block;width:14px;height:14px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite;vertical-align:middle}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── HELPER ─────────────────────────────────────────────────── */
.chip{display:inline-flex;align-items:center;gap:6px;border-radius:999px;padding:6px 14px;
  font-family:var(--font-head);font-weight:600;font-size:.85rem;
  background:rgba(255,255,255,.1);border:1.5px solid var(--line-2);color:#fff}
.chip-sun{background:rgba(255,210,63,.16);border-color:rgba(255,210,63,.6);color:var(--sun)}
.chip-cyan{background:rgba(61,224,255,.14);border-color:rgba(61,224,255,.55);color:var(--cyan)}
.text-grad{background:linear-gradient(90deg,var(--cyan),var(--lime) 30%,var(--sun) 55%,var(--pink) 80%,var(--violet));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}
.glow{text-shadow:0 0 18px rgba(61,224,255,.55)}
.muted{color:var(--ink-2)} .muted-2{color:var(--ink-3)}
.center{text-align:center}
.bob{animation:bob 3.4s ease-in-out infinite alternate}
@keyframes bob{from{transform:translateY(0)}to{transform:translateY(-12px)}}
.pop-in{animation:popIn .45s cubic-bezier(.34,1.56,.64,1) both}
@keyframes popIn{from{opacity:0;transform:scale(.85) translateY(12px)}to{opacity:1;transform:none}}

/* maskot robot */
.mascot{width:96px;height:96px;border-radius:30px;display:flex;align-items:center;justify-content:center;font-size:3.4rem;margin:0 auto;
  background:radial-gradient(circle at 30% 25%,rgba(255,255,255,.35),transparent 55%),linear-gradient(135deg,var(--violet),var(--cyan));
  box-shadow:0 0 0 4px rgba(255,255,255,.18),0 0 40px rgba(61,224,255,.5);animation:bob 3s ease-in-out infinite alternate}

.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:32px 16px}
.auth-card{width:100%;max-width:420px;padding:28px 22px}
@media(min-width:420px){.auth-card{padding:32px 28px}}
.divider{display:flex;align-items:center;gap:10px;color:var(--ink-3);font-size:.85rem;margin:18px 0}
.divider::before,.divider::after{content:'';flex:1;height:1px;background:var(--line)}
.back-link{color:var(--ink-3);font-size:.9rem;text-decoration:none;font-weight:700}
.back-link:hover{color:#fff}

/* fokus keyboard jelas */
:focus-visible{outline:3px solid var(--sun);outline-offset:3px}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
}