:root {
  --bg: #0b0f17;
  --card: rgba(255,255,255,0.06);
  --card2: rgba(255,255,255,0.08);
  --txt: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.62);
  --border: rgba(255,255,255,0.10);
  --accent: #7c5cff;
  --danger: #ff4d4d;
  --shadow: 0 12px 30px rgba(0,0,0,0.35);
  --radius: 18px;
}

html[data-theme="light"]{
  --bg: #f6f7fb;
  --card: #ffffff;
  --card2: #f1f3f9;
  --txt: rgba(0,0,0,0.88);
  --muted: rgba(0,0,0,0.55);
  --border: rgba(0,0,0,0.10);
  --accent: #5b3dff;
  --shadow: 0 10px 25px rgba(20,20,30,0.10);
}

*{ box-sizing:border-box; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial;
  background: var(--bg);
  color: var(--txt);
}

.topbar{
  position: sticky; top:0; z-index:10;
  display:flex; align-items:center; justify-content:space-between;
  padding: 14px 16px;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--border);
}

.brand{ display:flex; align-items:center; gap:10px; }
.brand__dot{
  width:12px; height:12px; border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--accent) 20%, transparent);
}
.brand__text{ font-weight: 750; letter-spacing: 0.2px; }

.topbar__right{ display:flex; align-items:center; gap:10px; }
.iconbtn{
  border:1px solid var(--border);
  background: var(--card);
  color: var(--txt);
  border-radius: 12px;
  padding: 10px 12px;
  cursor:pointer;
  box-shadow: var(--shadow);
}
.iconbtn .icon{ font-size: 16px; }

.pill{
  text-decoration:none;
  border:1px solid var(--border);
  background: var(--card);
  color: var(--txt);
  padding: 10px 12px;
  border-radius: 999px;
  box-shadow: var(--shadow);
}

.container{
  max-width: 980px;
  margin: 0 auto;
  padding: 18px 16px 92px; /* κάτω χώρο για bottombar */
}

.authwrap{
  min-height: calc(100vh - 70px);
  display:flex;
  align-items:center;
  justify-content:center;
}

.authcard{
  width: min(520px, 100%);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow);
  padding: 18px;
}

.authhead h1{ margin: 0 0 6px; font-size: 26px; letter-spacing: -0.2px; }
.muted{ color: var(--muted); }
.tiny{ font-size: 12px; margin-top: 12px; }

.alert{
  margin: 12px 0;
  border: 1px solid color-mix(in srgb, var(--danger) 35%, var(--border));
  background: color-mix(in srgb, var(--danger) 10%, transparent);
  color: var(--txt);
  border-radius: 14px;
  padding: 10px 12px;
}

.form{ margin-top: 12px; display:flex; flex-direction:column; gap: 12px; }
.field{ display:flex; flex-direction:column; gap: 6px; font-size: 13px; }
.field input{
  border: 1px solid var(--border);
  background: var(--card2);
  color: var(--txt);
  border-radius: 14px;
  padding: 12px 12px;
  outline:none;
  font-size: 16px; /* mobile-friendly */
}
.field input:focus{
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent);
}

.btn{
  border: none;
  border-radius: 14px;
  padding: 12px 14px;
  background: var(--accent);
  color: white;
  font-weight: 700;
  cursor: pointer;
}
.btn:active{ transform: translateY(1px); }

.bottombar{
  position: fixed;
  left: 0; right: 0; bottom: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  padding: 10px 10px calc(10px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(12px);
}

.navitem{
  text-decoration:none;
  display:flex;
  flex-direction: column;
  align-items:center;
  justify-content:center;
  gap: 2px;
  padding: 10px 8px;
  border-radius: 14px;
  border: 1px solid transparent;
  color: var(--muted);
}
.navitem .navicon{ font-size: 18px; }
.navitem .navlabel{ font-size: 11px; font-weight: 650; letter-spacing: 0.2px; }
.navitem.active{
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border-color: color-mix(in srgb, var(--accent) 25%, transparent);
  color: var(--txt);
}

/* Desktop: bottombar κρύβεται, κρατάμε χώρο */
@media (min-width: 900px){
  .container{ padding-bottom: 22px; }
  .bottombar{ display:none; }
}