/* ====== SETTINGS ====== */
:root{
  --pan-speed: 90s;         /* loop duration — coba 90s..140s untuk feel lambat */
  --overlay-dark: rgba(8,10,12,0.36);
  --card-bg-alpha: 0.88;
}

/* ====== BASE LAYOUT ====== */
*{box-sizing:border-box}
html,body{height:100%; margin:0;}
body{
  font-family: 'Poppins', system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  color: #0f172a;
}

/* ====== BACKGROUND PAN WRAPPER ====== */
/* fixed full-viewport container so slides always cover screen */
.bg-pan{
  position: fixed;
  inset: 0;
  z-index: -10;
  overflow: hidden;
  pointer-events: none;
}

/* slide wrapper is twice viewport width (two full slides side-by-side) */
.bg-slide{
  position: absolute;
  top: 0;
  left: 0;
  width: 200vw;       /* two times viewport width */
  height: 100vh;
  display: flex;
  transform: translate3d(0,0,0);
  will-change: transform;
  animation: slideX var(--pan-speed) linear infinite;
}

/* each bg-item covers exactly the viewport */
.bg-item{
  width: 100vw;
  height: 100vh;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  flex-shrink: 0;
  transform: translateZ(0); /* force GPU */
}

/* subtle dim overlay to keep text readable */
.bg-dim{
  position: absolute;
  inset: 0;
  background: var(--overlay-dark);
  z-index: 1;
  pointer-events: none;
}

/* ====== PREVENT JITTER / FLICKER ====== */
/* ensure images are not draggable/selectable */
.bg-item,
.bg-slide { -webkit-user-drag: none; user-drag: none; }

/* KEYFRAMES: translate from 0 -> -50vw (i.e., -100vw / 2) in percentage terms */
@keyframes slideX {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); } /* move left by one slide (50% of wrapper) */
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  .bg-slide { animation: none; transform: translateX(0); }
}

/* ====== LOGIN CARD (centered) ====== */
.login-body, /* ensure compatibility if you used body.login-body before */
body.login-body { /* in case other styles refer to .login-body */
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card{
  position: relative;
  z-index: 5;
  width: 350px;
  padding: 34px 28px;
  border-radius: 16px;
  text-align: center;
  background: rgba(255,255,255,var(--card-bg-alpha));
  backdrop-filter: blur(6px) saturate(1.05);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: 0 12px 34px rgba(4,10,25,0.28);
  animation: fadeIn .5s ease;
}

/* ====== CONTENT ====== */
.logo {
  width: 100px;
  height: 100px;
  object-fit: contain;
  margin-bottom: 12px;
}

.app-title{ font-size: 1.6rem; margin: 6px 0; font-weight:700; color:#222; }
.login-text{ font-size: 0.92rem; color:#556; margin-bottom:18px; }

/* ====== BUTTON ====== */
.btn-github{
  width:100%;
  background:#000;
  color:#fff;
  border: none;
  padding: 12px 16px;
  border-radius: 10px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  cursor:pointer;
  font-weight:600;
}
.btn-github img{ width:18px; filter: invert(1); }

/* ====== ANIMATION FADE IN ====== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ====== RESPONSIVE ====== */
@media (max-width:420px){
  .login-card{ width: 92%; padding: 22px; }
  .logo{ width:84px; height:84px; }
}