* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #020617;
  color: #e5e7eb;
}

/* 布局 */
.layout {
  display: flex;
  min-height: 100vh;
}
.sidebar {
  width: 240px;
  background: #0f172a;
  border-right: 1px solid #1f2937;
  padding: 16px;
}
.logo {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 24px;
}
.nav-section + .nav-section {
  margin-top: 16px;
}
.nav-title {
  font-size: 12px;
  color: #9ca3af;
  margin-bottom: 8px;
}
.nav-link {
  display: block;
  padding: 8px 10px;
  border-radius: 6px;
  color: #e5e7eb;
  text-decoration: none;
  font-size: 14px;
}
.nav-link:hover,
.nav-link.active {
  background: #1d4ed8;
}

/* 主内容 */
.main {
  flex: 1;
  padding: 24px;
}
.main-header h1 {
  font-size: 22px;
  margin-bottom: 16px;
}
.card {
  background: #0f172a;
  border-radius: 12px;
  padding: 20px;
  border: 1px solid #1f2937;
}
.btn {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  background: #374151;
  color: #e5e7eb;
  text-decoration: none;
}
.btn.primary {
  background: #2563eb;
}
.btn:hover {
  opacity: 0.9;
}
.error {
  color: #f97316;
  font-size: 12px;
  margin: 4px 0 8px;
}

/* 登录页 */
.login-layout {
  display: flex;
  min-height: 100vh;
}
.login-left {
  flex: 1;
  padding: 40px;
  background: #020617;
}
.login-left h1 {
  font-size: 26px;
  margin-bottom: 12px;
}
.login-left p {
  color: #9ca3af;
  margin-bottom: 24px;
}
.login-left form label {
  display: block;
  margin-top: 12px;
  margin-bottom: 4px;
}
.login-left input {
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid #1f2937;
  background: #020617;
  color: #e5e7eb;
}
.login-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 12px 0 16px;
}
.link {
  color: #60a5fa;
  font-size: 14px;
  text-decoration: none;
}
.link:hover {
  text-decoration: underline;
}
.login-right {
  width: 40%;
  background: #020617;
  position: relative;
}
.earth-bg {
  width: 100%;
  height: 100%;
  background: url("../img/earth.jpg") center/cover no-repeat;
  position: relative;
}
.earth-text {
  position: absolute;
  bottom: 40px;
  left: 40px;
  font-size: 24px;
  font-weight: 600;
}