.login-screen {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--bg-gradient);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.login-screen.out {
  opacity: 0;
  transform: scale(1.04);
  pointer-events: none;
}

.login-card {
  background: var(--surface);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  border: 1px solid var(--border-soft);
  box-shadow: 0 24px 60px var(--shadow);
  padding: 44px 36px 38px;
  width: 100%;
  max-width: 360px;
  text-align: center;
}

.login-seal {
  font-size: 52px;
  margin-bottom: 10px;
  animation: heartbeat 1.3s ease-in-out infinite;
  display: inline-block;
}

/* lub-dub: two quick beats then a long rest — like a real resting heart */
@keyframes heartbeat {
  0%   { transform: scale(1); }
  10%  { transform: scale(1.18); }   /* lub */
  20%  { transform: scale(1.04); }   /* brief settle */
  30%  { transform: scale(1.22); }   /* dub (slightly stronger) */
  45%  { transform: scale(1); }      /* relax back */
  100% { transform: scale(1); }      /* rest — most of the cycle */
}

.login-title {
  font-family: var(--font);
  font-size: 28px;
  font-style: italic;
  color: var(--accent-strong);
  margin-bottom: 6px;
}

.login-subtitle {
  font-family: var(--font);
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 28px;
  font-style: italic;
}

.login-hint {
  font-family: var(--font);
  font-size: 14px;
  color: var(--accent);
  font-style: italic;
  margin-bottom: 16px;
  opacity: 0.85;
}

.login-input-wrap {
  position: relative;
  margin-bottom: 16px;
}

.login-input {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 50px;
  background: var(--surface-glass);
  font-family: var(--font);
  font-size: 18px;
  color: var(--accent-strong);
  text-align: center;
  letter-spacing: 3px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.login-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
}
.login-input.shake {
  animation: shake 0.45s ease;
  border-color: var(--error);
}
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20%     { transform: translateX(-8px); }
  40%     { transform: translateX(8px); }
  60%     { transform: translateX(-5px); }
  80%     { transform: translateX(5px); }
}

.login-btn {
  width: 100%;
  padding: 13px;
  border: none;
  border-radius: 50px;
  background: var(--accent);
  color: var(--on-accent);
  font-family: var(--font);
  font-size: 17px;
  font-style: italic;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.15s ease;
}
.login-btn:hover { background: var(--accent-strong); transform: translateY(-1px); }

.login-error {
  margin-top: 14px;
  font-family: var(--font);
  font-size: 14px;
  font-style: italic;
  color: var(--accent);
  min-height: 20px;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.login-error.show { opacity: 1; }

/* PWA install button + iOS hint */
.install-btn {
  margin-top: 14px;
  background: none;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--font);
  font-size: 14px;
  padding: 9px 18px;
  border-radius: 30px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}
.install-btn:hover { background: var(--accent); color: var(--on-accent); }

.ios-install-hint {
  margin-top: 12px;
  font-family: var(--font);
  font-size: 13px;
  font-style: italic;
  color: var(--text-muted);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s ease, opacity 0.4s ease;
}
.ios-install-hint.show { max-height: 60px; opacity: 1; }
.ios-install-hint b { color: var(--accent-strong); font-style: normal; }