:root {
  /* Bright & Clean Theme Colors */
  --primary-color: #0d6efd; /* Bootstrap Blue */
  --secondary-color: #6c757d; /* Gray */
  --light-bg: #f8f9fa;      /* Very Light Gray (Body Background) */
  --content-bg: #ffffff;     /* White (Content Wrapper, Navbar, Sidebar) */
  --sidebar-bg: #ffffff;     /* White Sidebar */
  --navbar-bg: #ffffff;      /* White Navbar */
  --text-dark: #212529;      /* Dark Gray (Main Text) */
  --text-muted: #6c757d;     /* Muted Gray (Secondary Text) */
  --border-color: #dee2e6;   /* Light Gray Border */
  --hover-bg: #e9ecef;       /* Light Gray Hover Background */
}

body {
  background-color: var(--light-bg);
  color: var(--text-dark); /* Default text dark */
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

/* --- Navbar Styling --- */
.navbar {
  background-color: var(--navbar-bg) !important;
  border-bottom: 1px solid var(--border-color); /* Light border */
  box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075); /* Subtle shadow */
}

.navbar-light .navbar-brand,
.navbar-light .nav-link {
    color: var(--text-muted) !important; /* Navbar text muted gray */
    transition: color 0.15s ease-in-out;
}

.navbar-light .navbar-brand {
     color: var(--text-dark) !important; /* Brand text slightly darker */
}

.navbar-light .nav-link:hover {
    color: var(--primary-color) !important; /* Hover links become blue */
}

.navbar-light .nav-link.active {
    color: var(--primary-color) !important;
    font-weight: 500; /* Slightly bolder active link */
}


/* --- Sidebar Styling --- */
.sidebar {
    background-color: var(--sidebar-bg);
    min-height: 100vh;
    box-shadow: inset -1px 0 0 var(--border-color);
    padding: 0 0.5rem;
}

/* Add padding to the sticky container inside the sidebar */
.sidebar .position-sticky {
    /* padding-top: 0.5rem; */ /* Remove this */
}

/* Set margin/padding for the nav list itself */
.sidebar .nav.flex-column {
    margin-top: 1rem; /* Add margin to the top of the list */
    padding-top: 0; /* Ensure no default padding */
    padding-left: 0; /* Ensure no default left padding from user-agent stylesheet */
}

.sidebar .nav-link {
    color: var(--text-muted); /* Sidebar links muted gray */
    padding: 0.6rem 1rem; /* Adjust padding */
    border-radius: 0.3rem;
    margin-bottom: 0.25rem;
    transition: all 0.15s ease-in-out;
    display: flex;
    align-items: center;
    border: 1px solid transparent;
}

.sidebar .nav-link i {
    margin-right: 0.75rem;
    width: 1.2em;
    text-align: center;
    color: var(--text-muted);
    transition: color 0.15s ease-in-out;
}

.sidebar .nav-link:hover {
    color: var(--text-dark); /* Hover links become darker gray */
    background-color: var(--hover-bg); /* Hover background light gray */
}

.sidebar .nav-link:hover i {
    color: var(--text-dark);
}

.sidebar .nav-link.active {
    background-color: var(--primary-color); /* Active link blue background */
    color: white; /* Active link white text */
    font-weight: 500;
    border: 1px solid var(--primary-color);
}

.sidebar .nav-link.active i {
    color: white; /* Active link white icon */
}

.sidebar .nav-link.active:hover {
     background-color: #0b5ed7; /* Darker blue on hover for active */
     color: white;
}

.sidebar-heading {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    margin-top: 1rem;
}


/* --- Main Content Styling --- */
.main-content {
    /* margin-left: 0 !important;  删除或注释 */
    padding: 2rem;
    /* width: 100%;  删除或注释 */
}

.content-wrapper {
    background-color: var(--content-bg);
    border-radius: 0.5rem;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    padding: 0.5rem 1rem;  /* 顶部0.5rem，左右1rem */
    border: 1px solid var(--border-color);
    color: var(--text-dark);
}

/* --- Buttons --- */
.btn-primary {
  background-color: var(--primary-color); /* Blue background */
  border: 1px solid var(--primary-color);
  color: white;
  transition: all 0.15s ease-in-out;
  box-shadow: none; /* Remove sci-fi glow */
}
.btn-primary:hover {
  background-color: #0b5ed7; /* Darker blue on hover */
  color: white;
  border-color: #0a58ca;
  box-shadow: none;
}

.btn-secondary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: white;
}
.btn-secondary:hover {
    background-color: #5c636a; /* Darker gray */
    border-color: #565e64;
}

/* --- Forms --- */
.form-control {
    background-color: var(--content-bg); /* White background */
    border: 1px solid var(--border-color);
    color: var(--text-dark);
}
.form-control:focus {
    background-color: var(--content-bg);
    color: var(--text-dark);
    border-color: #86b7fe; /* Bootstrap's default focus blue */
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25); /* Bootstrap's focus glow */
}
.form-label {
    color: var(--text-dark);
}

/* --- Tables --- */
.table {
    color: var(--text-dark); /* Dark text */
    border-color: var(--border-color); /* Light border */
}
.table > :not(caption) > * > * {
    background-color: transparent;
    border-bottom-width: 1px;
}
.table-striped > tbody > tr:nth-of-type(odd) > * {
     background-color: rgba(0, 0, 0, 0.03); /* Very subtle stripe */
     color: var(--text-dark);
}
.table-hover > tbody > tr:hover > * {
    background-color: rgba(0, 0, 0, 0.05); /* Subtle hover */
    color: var(--text-dark);
}

/* --- Admin Specific Styles (保留并调整颜色) --- */
/* Styles for Admin Permissions/Menu Management (from admin/base.html) */
.menu-item {
    border: 1px solid var(--border-color);
    background-color: var(--content-bg);
    border-radius: 4px;
    margin-bottom: 1rem;
    padding: 1rem;
}

.menu-header {
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.menu-header i {
    margin-right: 0.5rem;
    color: var(--text-muted);
}

.submenu-item {
    margin-left: 1.5rem;
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    border-left: 3px solid var(--border-color);
    color: var(--text-muted);
}

.menu-permissions {
    margin-top: 0.5rem;
}

.form-check-inline {
    margin-right: 1rem;
}
.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.list-group-item {
    cursor: pointer;
    background-color: var(--content-bg);
    border: 1px solid var(--border-color);
    color: var(--text-dark);
}

.list-group-item:hover {
    background-color: var(--hover-bg);
    color: var(--text-dark);
}

.list-group-item.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    box-shadow: none; /* Remove sci-fi glow */
}

.row {
    align-items: flex-start;
}