.auth-modal,
.onboarding-modal {
  position: fixed;
  z-index: 90;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  visibility: hidden;
  opacity: 0;
  background: rgba(5, 14, 11, 0.62);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  pointer-events: none;
  transition: opacity 0.35s var(--ease-quiet), visibility 0.35s var(--ease-quiet);
}

.onboarding-background {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background-image: url("assets/warm-study-background.jpg");
  background-position: center;
  background-size: cover;
  opacity: 0.36;
}

.onboarding-background::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(11, 29, 23, 0.9), rgba(11, 29, 23, 0.46));
}

.onboarding-background video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.auth-modal.is-open,
.onboarding-modal.is-open {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

.auth-modal-open {
  overflow: hidden;
}

.auth-dialog {
  position: relative;
  width: min(430px, 100%);
  padding: 34px 32px 26px;
  border: 1px solid rgba(255, 255, 255, 0.42);
  border-radius: 22px;
  background: linear-gradient(145deg, rgba(35, 54, 47, 0.92), rgba(9, 23, 19, 0.9));
  box-shadow: 0 28px 90px rgba(2, 10, 7, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.auth-close {
  position: absolute;
  top: 16px;
  right: 17px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  color: var(--warm-text);
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
  font-size: 22px;
}

.auth-close:hover {
  background: rgba(255, 255, 255, 0.16);
}

.auth-heading {
  padding-right: 28px;
}

.auth-heading p,
.auth-note {
  margin: 0;
  color: rgba(255, 246, 232, 0.48);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 10px;
  letter-spacing: 0.08em;
}

.onboarding-dialog {
  position: relative;
  z-index: 1;
  width: min(620px, 100%);
  min-height: 440px;
  padding: 34px 36px 30px;
  border: 1px solid rgba(255, 255, 255, 0.42);
  border-radius: 24px;
  background: linear-gradient(145deg, rgba(35, 54, 47, 0.94), rgba(9, 23, 19, 0.92));
  box-shadow: 0 28px 90px rgba(2, 10, 7, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.onboarding-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: rgba(255, 246, 232, 0.48);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 10px;
  letter-spacing: 0.08em;
}

.onboarding-progress strong {
  color: rgba(255, 246, 232, 0.72);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0;
}

.onboarding-heading {
  margin-top: 25px;
}

.onboarding-heading h2 {
  margin: 0;
  color: var(--warm-text);
  font-family: "STZhongsong", "华文中宋", "STSong", "SimSun", serif;
  font-size: 31px;
  font-weight: 700;
}

.onboarding-heading p {
  margin: 10px 0 0;
  color: rgba(255, 246, 232, 0.62);
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 15px;
}

.onboarding-tags {
  display: flex;
  min-height: 142px;
  align-content: flex-start;
  flex-wrap: wrap;
  gap: 11px;
  margin-top: 30px;
}

.onboarding-tag {
  min-height: 42px;
  padding: 9px 18px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 16px;
  color: rgba(255, 246, 232, 0.72);
  background: rgba(255, 255, 255, 0.06);
  cursor: pointer;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 13px;
  transition: color 0.3s var(--ease-quiet), background 0.3s var(--ease-quiet), border-color 0.3s var(--ease-quiet), transform 0.3s var(--ease-quiet);
}

.onboarding-tag:hover {
  color: var(--warm-text);
  background: rgba(255, 255, 255, 0.11);
  transform: translateY(-1px);
}

.onboarding-tag[aria-pressed="true"] {
  border-color: rgba(255, 246, 232, 0.82);
  color: #17342d;
  background: rgba(255, 246, 232, 0.9);
  box-shadow: 0 8px 22px rgba(3, 13, 10, 0.18);
}

.onboarding-error {
  min-height: 18px;
  margin: 7px 0 0;
  color: #efb6a8;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 11px;
}

.onboarding-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 14px;
}

.onboarding-skip {
  margin-right: auto;
  padding: 10px 4px;
  border: 0;
  color: rgba(255, 246, 232, 0.56);
  background: transparent;
  cursor: pointer;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 12px;
}

.onboarding-skip:hover {
  color: var(--warm-text);
}

.onboarding-primary {
  min-width: 116px;
  min-height: 42px;
  border-radius: 14px;
}

.onboarding-primary[hidden] {
  display: none;
}

.auth-heading h2 {
  margin: 9px 0 8px;
  color: var(--warm-text);
  font-family: "STZhongsong", "华文中宋", "STSong", "SimSun", serif;
  font-size: 28px;
  font-weight: 700;
}

.auth-heading span {
  color: rgba(255, 246, 232, 0.62);
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 14px;
}

.auth-mode-switch {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px;
  margin: 26px 0 20px;
  padding: 4px;
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.07);
}

.auth-mode-switch button {
  min-height: 36px;
  border-radius: 10px;
  color: rgba(255, 246, 232, 0.58);
  background: transparent;
  cursor: pointer;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 12px;
}

.auth-mode-switch button[aria-selected="true"] {
  color: var(--warm-text);
  background: rgba(255, 255, 255, 0.15);
}

.auth-form {
  display: grid;
  gap: 14px;
}

.auth-register-field[hidden] {
  display: none;
}

.auth-field {
  display: grid;
  gap: 7px;
}

.auth-field span {
  color: rgba(255, 246, 232, 0.68);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 12px;
}

.auth-field input {
  width: 100%;
  min-height: 44px;
  padding: 10px 13px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  outline: 0;
  color: var(--warm-text);
  background: rgba(255, 255, 255, 0.08);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 13px;
}

.auth-field input:focus {
  border-color: rgba(255, 246, 232, 0.72);
  background: rgba(255, 255, 255, 0.13);
}

.auth-field input::placeholder {
  color: rgba(255, 246, 232, 0.36);
}

.auth-error {
  min-height: 18px;
  margin: -2px 0 -4px;
  color: #efb6a8;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 11px;
}

.auth-submit {
  width: 100%;
  min-height: 44px;
  border-radius: 13px;
}

.auth-note {
  margin-top: 18px;
  text-align: center;
  letter-spacing: 0;
}

.account-greeting {
  max-width: 120px;
  padding: 6px 8px;
  border: 0;
  border-radius: 10px;
  overflow: hidden;
  color: var(--warm-text);
  background: transparent;
  cursor: pointer;
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 15px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.account-greeting:hover,
.account-greeting[aria-expanded="true"] {
  background: rgba(255, 255, 255, 0.08);
}

.account-profile {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
}

.account-avatar-upload {
  position: relative;
  display: grid;
  flex: 0 0 40px;
  width: 40px;
  height: 40px;
  place-items: center;
  overflow: visible;
  border: 1px solid rgba(255, 255, 255, 0.64);
  border-radius: 50%;
  color: var(--warm-text);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: background 0.35s var(--ease-quiet), transform 0.35s var(--ease-quiet);
}

.account-avatar-upload:hover {
  background: rgba(255, 255, 255, 0.16);
  transform: translateY(-1px);
}

.account-avatar-upload.is-loading {
  opacity: 0.55;
  pointer-events: none;
}

.account-avatar-upload img,
.account-avatar-fallback {
  width: 100%;
  height: 100%;
  border-radius: inherit;
}

.account-avatar-upload img {
  display: block;
  object-fit: cover;
}

.account-avatar-fallback {
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.12);
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 17px;
}

.account-avatar-add {
  position: absolute;
  right: -2px;
  bottom: -2px;
  display: grid;
  width: 16px;
  height: 16px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.82);
  border-radius: 50%;
  color: #17352d;
  background: var(--warm-text);
  font-family: Arial, sans-serif;
  font-size: 12px;
  line-height: 1;
}

.account-menu-panel {
  position: absolute;
  z-index: 20;
  top: calc(100% + 10px);
  right: 0;
  min-width: 112px;
  padding: 6px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 12px;
  background: rgba(19, 39, 33, 0.94);
  box-shadow: 0 18px 42px rgba(4, 15, 12, 0.3);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.account-menu-panel[hidden] {
  display: none;
}

.account-logout {
  width: 100%;
  padding: 9px 10px;
  border: 0;
  border-radius: 8px;
  color: rgba(255, 246, 232, 0.76);
  background: transparent;
  cursor: pointer;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 12px;
  text-align: center;
}

.account-logout:hover {
  color: var(--warm-text);
  background: rgba(255, 255, 255, 0.1);
}

@media (max-width: 620px), (min-width: 621px) and (max-width: 1024px) and (orientation: portrait) {
  .auth-modal,
  .onboarding-modal {
    padding: 16px;
  }

  .auth-dialog {
    padding: 30px 22px 22px;
  }

  .onboarding-dialog {
    min-height: 0;
    padding: 28px 22px 22px;
  }

  .onboarding-heading {
    margin-top: 20px;
  }

  .onboarding-heading h2 {
    font-size: 26px;
  }

  .onboarding-tags {
    min-height: 0;
    gap: 8px;
    margin-top: 24px;
  }

  .onboarding-tag {
    min-height: 38px;
    padding: 8px 13px;
    border-radius: 13px;
    font-size: 12px;
  }

  .onboarding-actions {
    flex-wrap: wrap;
  }

  .onboarding-skip {
    flex-basis: 100%;
    margin-right: 0;
    order: 2;
    text-align: center;
  }

  .onboarding-primary {
    width: 100%;
  }

  .account-greeting {
    max-width: 96px;
  }
}