.overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  background: rgba(4, 6, 20, 0.65);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: grid;
  place-items: end center;
  padding: 24px;
}

.overlay[hidden] { display: none; }

#loginOverlay {
  place-items: center;
}

.sheet {
  width: min(720px, 100%);
  background: var(--glass-strong);
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 24px;
  padding: 20px;
  box-shadow: var(--shadow);
  color: var(--ink);
}

.sheet header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.sheet h3 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 500;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sheet header p {
  color: var(--muted);
  font-size: 13px;
}

.close {
  padding: 8px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--ink-soft);
  transition: 0.15s;
}

.close:hover {
  background: rgba(255, 255, 255, 0.14);
  color: var(--ink);
}

.about-body {
  line-height: 1.7;
  color: var(--ink-soft);
}

.about-body ul {
  margin-top: 12px;
  padding-left: 18px;
}

.login-sheet {
  width: min(420px, 100%);
}

.login-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.login-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.login-form label span {
  font-size: 13px;
  color: var(--muted);
}

.login-form input {
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 15px;
  outline: none;
  transition: 0.15s;
}

.login-form input::placeholder {
  color: var(--muted);
}

.login-form input:focus {
  border-color: var(--neon-orange);
  box-shadow: 0 0 0 3px rgba(255, 156, 64, 0.18);
}

.login-submit {
  margin-top: 4px;
  padding: 12px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--neon-orange), var(--neon-yellow));
  color: #2a1c10;
  font-weight: 600;
  font-size: 15px;
  box-shadow: 0 0 20px rgba(255, 156, 64, 0.28);
  transition: 0.15s;
}

.login-submit:hover {
  box-shadow: 0 0 28px rgba(255, 156, 64, 0.45);
  transform: translateY(-1px);
}

.divider {
  position: relative;
  text-align: center;
  margin: 4px 0;
}

.divider::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line);
}

.divider span {
  position: relative;
  padding: 0 12px;
  background: transparent;
  font-size: 12px;
  color: var(--muted);
}

.social-login {
  display: flex;
  gap: 10px;
}

.social-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 13px;
  transition: 0.15s;
}

.social-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  color: var(--ink);
}

.login-tip {
  text-align: center;
  font-size: 13px;
  color: var(--neon-orange);
  min-height: 20px;
}

/* 顶部浮层提示 */
.toast {
  position: fixed;
  top: 18px;
  left: 50%;
  transform: translate(-50%, -16px);
  z-index: 50;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--glass-strong);
  border: 1px solid rgba(255, 156, 64, 0.32);
  color: var(--ink);
  font-size: 13px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  opacity: 0;
  transition: 0.25s ease;
}

.toast.in {
  opacity: 1;
  transform: translate(-50%, 0);
}