:root {
  --uc-primary: #0b61aa;
  --uc-primary-dark: #083f75;
  --uc-bg: #edf0f4;
  --uc-panel: #ffffff;
  --uc-border: #dfe3ea;
  --uc-muted: #6b758c;
  --uc-shadow: 0 18px 40px rgba(15, 36, 63, 0.1);
}

main {
  /* 灰色墙面纹理背景 */
  background-color: #e8e8e8;
  background-image: url("../img/usercenter-bg.png");
  background-repeat: repeat;
  background-size: auto;
  font-family: "Helvetica Neue", Arial, sans-serif;
}

.usercenter-body {

  color: #1f2640;
}

.usercenter-page {
  min-height: calc(100vh - 120px);
}

.usercenter-shell {
  max-width: 1440px;
  margin: auto;
  padding: 30px 24px 48px;
}

.usercenter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.usercenter-header__title {
  font-size: 28px;
  font-weight: 600;
  color: #1b2033;
}

.usercenter-breadcrumb {
  font-size: 13px;
  color: #9ba3b5;
}

.usercenter-breadcrumb__list {
  display: flex;
  gap: 6px;
  align-items: center;
}

.usercenter-breadcrumb__item--current {
  color: #1f2640;
  font-weight: 600;
}

.usercenter-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 24px;
}

.usercenter-sidebar {
  background: var(--uc-panel);
  border-radius: 12px;
  box-shadow: var(--uc-shadow);
  overflow: hidden;
}

.usercenter-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.usercenter-menu__item {
  border-bottom: 1px solid #f1f3f6;
}

.usercenter-menu__item--logout {
  margin-top: 8px;
}

.usercenter-menu__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 22px;
  color: #30374f;
  font-size: 16px;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.usercenter-menu__icon {
  color: #8c96ad;
  font-size: 20px;
}

.usercenter-menu__item--active .usercenter-menu__link {
  background: var(--uc-primary);
  color: #fff;
}

.usercenter-menu__item--active .usercenter-menu__icon {
  color: #fff;
}

.usercenter-content {
  min-height: 640px;
}

.usercenter-panel {
  background: var(--uc-panel);
  border-radius: 18px;
  box-shadow: var(--uc-shadow);
  height: 100%;
}

.usercenter-btn {
  min-width: 140px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--uc-border);
  background: transparent;
  font-weight: 600;
  color: #3a435d;
  cursor: pointer;
}

.usercenter-btn--secondary {
  background: #f6f8fb;
}

.usercenter-link {
  border: none;
  background: none;
  color: var(--uc-primary);
  font-weight: 600;
  cursor: pointer;
}

/* Responsive */
@media (max-width: 1100px) {
  .usercenter-layout {
    grid-template-columns: 1fr;
  }

  .usercenter-sidebar {
    order: 1;
  }

  .usercenter-content {
    min-height: auto;
  }
}

@media (max-width: 720px) {
  .usercenter-shell {
    padding: 16px 16px 32px;
  }

  .usercenter-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .usercenter-header__title {
    font-size: 22px;
  }

  .usercenter-menu__link {
    padding: 14px 18px;
    font-size: 15px;
  }

  .usercenter-menu__icon {
    font-size: 18px;
  }

  .usercenter-panel {
    border-radius: 12px;
  }

  .usercenter-btn {
    min-width: 100px;
    padding: 8px 14px;
    font-size: 14px;
  }
}

@media (max-width: 480px) {
  .usercenter-shell {
    padding: 12px 12px 24px;
  }

  .usercenter-header__title {
    font-size: 20px;
  }

  .usercenter-layout {
    gap: 16px;
  }

  .usercenter-menu__link {
    padding: 12px 16px;
    font-size: 14px;
  }
}