/* assets/css/style.css - 强制覆盖版 (替换整个文件) */
body {
  background-color: #f5f7fa;
  font-family: 'Segoe UI', Arial, sans-serif;
  color: #333;
  margin: 0;
  padding: 0;
}

/* 导航 */
.navbar {
  background-color: #1976d2 !important;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.navbar .navbar-brand {
  color: #fff !important;
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: 0.5px;
}

/* container-box：桌面端强制居中、最大宽度放开；手机版再收窄 */
.container-box {
  background: #fff;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  margin: 40px auto;
  width: 100%;
  max-width: 1100px;        /* ← 桌面允许到 1100px 宽 */
  box-sizing: border-box;
}

/* 小组件（如果你需要窄卡片可以在页面内个别限制） */
.container-box.card-small {
  max-width: 420px;
}

/* 按钮样式 */
.btn-primary {
  background-color: #1976d2;
  border: none;
  font-weight: 500;
}
.btn-primary:hover {
  background-color: #1258a1;
}

/* 密码眼睛 */
.password-toggle-btn {
  border: none;
  background: none;
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  cursor: pointer;
  color: #6c757d;
  transition: color 0.2s ease;
}
.password-toggle-btn:hover {
  color: #000;
}

footer {
  color: #777;
  font-size: 0.9rem;
  margin-top: 60px;
}

/* ===== 手机和平板自适应 ===== */
@media (max-width: 768px) {
  .container-box {
    margin-top: 20px;
    padding: 25px 20px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    max-width: 420px;   /* 仅在窄屏时限制为手机卡片宽度 */
  }
  h1 { font-size: 1.6rem; }
  .form-control { font-size: 0.95rem; }
  .btn { font-size: 1rem; padding: 10px; }
}

@media (max-width: 400px) {
  .container-box { padding: 20px 15px; }
  h1 { font-size: 1.4rem; }
}
/* ✅ 修复 Student Dashboard 顶部导航栏样式与 Supervisor Dashboard 一致 */
.navbar {
  background-color: #1976d2 !important;
  padding-top: 0.4rem !important;
  padding-bottom: 0.4rem !important;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand {
  font-size: 1.1rem !important;
  font-weight: 500 !important;
  color: #fff !important;
  margin-left: 10px;
}

.navbar-nav .nav-link {
  color: #fff !important;
  font-weight: 400;
  font-size: 0.95rem;
}

.navbar-nav .nav-link:hover {
  text-decoration: underline;
}

/* ✅ 移除上方多余空白（特别是手机） */
body {
  margin-top: 0 !important;
  padding-top: 0 !important;
}