:root {
  --bg:#000000; --card:#2e2e2e; --text:#e2e8f0; --muted:#a1a1aa; --border:#3f3f46;
  --accent:#22c55e; --shadow:0 10px 30px rgba(0,0,0,.5);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;min-height:100svh;display:grid;place-items:center;background:var(--bg);color:var(--text);
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial;transition:background-color .25s,color .25s;
}

.container{width:clamp(320px,92vw,760px);padding:24px}
.header{display:flex;align-items:center;gap:12px;margin-bottom:18px}
.logo{width:36px;height:36px;border-radius:10px;background:var(--accent)}
h1{font-size:20px;margin:0}
.muted{color:var(--muted);font-size:13px}

.card{
  border:1px solid var(--border);border-radius:16px;background:var(--card);box-shadow:var(--shadow);
  padding:20px;position:relative;transition:background-color .25s,border-color .25s,box-shadow .25s;
}

.row{display:flex;gap:12px;align-items:center;margin:10px 0}
input[type=email],input[type=password]{
  width:100%;flex:1;display:block;padding:12px 14px;border-radius:12px;border:1px solid #52525b;
  background:#1f1f1f;color:var(--text);outline:none;transition:border-color .2s,box-shadow .2s,background-color .25s,color .25s;
}
input[type=email]:focus,input[type=password]:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(34,197,94,.25)}

/* shake chỉ cho ô mật khẩu */
@keyframes shakeX {
  0%,100% { transform:translateX(0) }
  20% { transform:translateX(-6px) }
  40% { transform:translateX(6px) }
  60% { transform:translateX(-4px) }
  80% { transform:translateX(4px) }
}
input[type=password].shake{
  animation:shakeX .45s ease;
  border-color:#ef4444 !important;
  box-shadow:0 0 0 3px rgba(239,68,68,.25) !important;
}

button{
  padding:12px 14px;border-radius:12px;border:1px solid var(--accent);background:var(--accent);color:#fff;font-weight:600;
  cursor:pointer;transition:transform .08s ease,filter .2s,box-shadow .2s,background .25s,border-color .25s;
}
button:hover{filter:brightness(1.08);box-shadow:0 8px 20px rgba(34,197,94,.25);transform:translateY(-1px)}
button:active{transform:translateY(0)}
button.secondary{background:transparent;color:var(--text);border-color:#52525b}

button .spinner{
  width:16px;height:16px;margin-left:8px;border-radius:50%;border:2px solid #fff;border-top-color:transparent;
  vertical-align:middle;display:none;
}
button.loading .spinner{display:inline-block;animation:spin .6s linear infinite}
button.loading .btn-text{opacity:.6}
@keyframes spin{to{transform:rotate(360deg)}}

.right{margin-left:auto}

.list{display:grid;gap:10px}
.item{
  display:flex;justify-content:space-between;align-items:center;padding:12px 14px;border:1px solid var(--border);border-radius:12px;
  transition:transform .18s,background-color .2s,border-color .2s;
}
.item:hover{transform:translateY(-1px)}
.dev{font-weight:700}
.badge{padding:2px 8px;border-radius:999px;font-size:12px;border:1px solid var(--border)}

.skeleton{
  height:56px;border-radius:12px;background:linear-gradient(90deg,#3f3f46 25%,#52525b 37%,#3f3f46 63%);
  background-size:400% 100%;animation:shimmer 1.1s infinite linear;border:1px solid var(--border);
}
@keyframes shimmer{0%{background-position:100% 0}100%{background-position:0 0}}

/* Alert top-center */
.alert{
  position:fixed; top:16px; left:50%; transform:translate(-50%,-16px) scale(.98);
  z-index:100; min-width:320px; max-width:min(90vw,560px);
  padding:12px 16px; border-radius:12px; font-weight:600; text-align:center;
  color:#fff; background:#1f1f1f; border:1px solid var(--border); box-shadow:0 12px 30px rgba(0,0,0,.45);
  opacity:0; pointer-events:none;
}
.alert.show{ animation:dropIn .55s cubic-bezier(.2,.8,.2,1) forwards }
.alert.hide{ animation:slideUp .25s ease forwards }
.alert.success{ border-color:#22c55e; background:#14532d }
.alert.error{   border-color:#ef4444; background:#7f1d1d }

@keyframes dropIn{0%{opacity:0;transform:translate(-50%,-24px) scale(.96)}60%{opacity:1;transform:translate(-50%,0) scale(1.01)}100%{opacity:1;transform:translate(-50%,0) scale(1)}}
@keyframes slideUp{to{opacity:0;transform:translate(-50%,-16px) scale(.98)}}

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