* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --green-dark: #3a5c3a;
  --green-mid:  #5a8a5a;
  --green-pale: #e8f0e3;
  --earth:      #8b6340;
  --earth-pale: #f5ede0;
  --red:        #c0392b;
}
body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--green-dark);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.card {
  background: #fff;
  border-radius: 20px;
  padding: 40px 36px;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  text-align: center;
}
.logo { font-size: 52px; margin-bottom: 10px; }
h1 { font-size: 22px; font-weight: 800; color: var(--green-dark); margin-bottom: 4px; }
.subtitle { font-size: 13px; color: #888; margin-bottom: 32px; }

.user-picker {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}
.user-tile {
  flex: 1;
  width: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 16px 8px;
  background: var(--green-pale);
  color: var(--green-dark);
  border: 2px solid #dde8d5;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.15s;
}
.user-tile:hover { border-color: var(--green-mid); background: #ddebd5; }
.user-tile.selected {
  border-color: var(--green-dark);
  background: var(--green-dark);
  color: #fff;
  box-shadow: 0 4px 14px rgba(58,92,58,0.35);
}
.user-emoji { font-size: 30px; line-height: 1; }
.user-name  { font-size: 15px; font-weight: 700; }

input[type=password] {
  width: 100%;
  padding: 13px 16px;
  border: 2px solid #dde8d5;
  border-radius: 12px;
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s;
  margin-bottom: 14px;
  text-align: center;
  letter-spacing: 3px;
}
input[type=password]:focus { border-color: var(--green-mid); }
input[type=password]::placeholder { letter-spacing: 0; color: #bbb; }

button {
  width: 100%;
  padding: 14px;
  background: var(--green-dark);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
}
button:hover    { background: var(--green-mid); }
button:disabled { background: #aaa; cursor: not-allowed; }

.error {
  margin-top: 14px;
  color: var(--red);
  font-size: 13px;
  font-weight: 600;
  display: none;
}
.hint {
  margin-top: 20px;
  font-size: 12px;
  color: #bbb;
}