/* ===== Modern Admin Design System ===== */
/* 现代化管理后台样式系统 - 基于Bootstrap 5 */

/* ===== CSS变量 ===== */
:root {
    /* 字体 */
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-family-mono: 'SF Mono', Menlo, Monaco, Consolas, monospace;
    
    /* 主色调 - Bootstrap风格 */
    --color-primary: #0d6efd;
    --color-primary-hover: #0b5ed7;
    --color-primary-light: #cfe2ff;
    --color-primary-dark: #0553b8;
    
    --color-success: #198754;
    --color-success-hover: #157347;
    --color-success-light: #d1e7dd;
    
    --color-danger: #dc3545;
    --color-danger-hover: #bb2d3b;
    --color-danger-light: #f8d7da;
    
    --color-warning: #ffc107;
    --color-warning-hover: #ffca2c;
    --color-warning-light: #fff3cd;
    
    --color-info: #0dcaf0;
    --color-info-hover: #31d2f2;
    --color-info-light: #cff4fc;
    
    --color-secondary: #6c757d;
    --color-secondary-hover: #5c636a;
    
    /* 中性色 */
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f8f9fa;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;
    --color-black: #000000;
    
    /* 背景色 */
    --bg-body: #f5f7fa;
    --bg-card: #ffffff;
    --bg-sidebar: #1e293b;
    --bg-sidebar-hover: #334155;
    --bg-header: #ffffff;
    
    /* 文字色 */
    --text-body: #212529;
    --text-muted: #6c757d;
    --text-light: #adb5bd;
    --text-white: #ffffff;
    
    /* 边框 */
    --border-color: #dee2e6;
    --border-light: #e9ecef;
    --border-radius-sm: 4px;
    --border-radius: 6px;
    --border-radius-lg: 8px;
    --border-radius-xl: 12px;
    --border-radius-pill: 50rem;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    
    /* 间距 */
    --spacer: 1rem;
    --spacer-sm: 0.5rem;
    --spacer-lg: 1.5rem;
    --spacer-xl: 2rem;
    
    /* 布局 */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 70px;
    --header-height: 64px;
    
    /* 过渡 */
    --transition: all 0.2s ease;
    --transition-fast: all 0.15s ease;
}

/* ===== 基础样式 ===== */
html, body {
    height: 100%;
    font-family: var(--font-family-sans);
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-body);
    background-color: var(--bg-body);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 链接 */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

/* ===== 排版 ===== */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: 0.5rem;
    font-weight: 600;
    line-height: 1.25;
    color: var(--text-body);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

p { margin-bottom: 1rem; }

small, .text-small { font-size: 0.875em; }

.text-muted { color: var(--text-muted) !important; }
.text-primary { color: var(--color-primary) !important; }
.text-success { color: var(--color-success) !important; }
.text-danger { color: var(--color-danger) !important; }
.text-warning { color: var(--color-warning) !important; }

/* ===== 按钮组件 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

/* 主要按钮 */
.btn-primary {
    color: var(--color-white);
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

/* 次要按钮 */
.btn-secondary {
    color: var(--color-white);
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-secondary-hover);
    border-color: var(--color-secondary-hover);
}

/* 成功按钮 */
.btn-success {
    color: var(--color-white);
    background-color: var(--color-success);
    border-color: var(--color-success);
}

.btn-success:hover:not(:disabled) {
    background-color: var(--color-success-hover);
    border-color: var(--color-success-hover);
}

/* 危险按钮 */
.btn-danger {
    color: var(--color-white);
    background-color: var(--color-danger);
    border-color: var(--color-danger);
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--color-danger-hover);
    border-color: var(--color-danger-hover);
}

/* 轮廓按钮 */
.btn-outline-primary {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background-color: transparent;
}

.btn-outline-primary:hover:not(:disabled) {
    color: var(--color-white);
    background-color: var(--color-primary);
}

.btn-outline-secondary {
    color: var(--color-secondary);
    border-color: var(--color-secondary);
    background-color: transparent;
}

.btn-outline-secondary:hover:not(:disabled) {
    color: var(--color-white);
    background-color: var(--color-secondary);
}

/* 幽灵按钮 */
.btn-ghost {
    color: var(--text-muted);
    background-color: transparent;
    border-color: var(--border-color);
}

.btn-ghost:hover:not(:disabled) {
    color: var(--text-body);
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-400);
}

/* 按钮尺寸 */
.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    border-radius: var(--border-radius-sm);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: var(--border-radius-lg);
}

/* 图标按钮 */
.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: 50%;
}

/* ===== 表单组件 ===== */
.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-body);
}

.form-label .required {
    color: var(--color-danger);
    margin-left: 2px;
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-body);
    background-color: var(--color-white);
    background-clip: padding-box;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus {
    color: var(--text-body);
    background-color: var(--color-white);
    border-color: var(--color-primary);
    outline: 0;
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.15);
}

.form-control::placeholder {
    color: var(--text-light);
    opacity: 1;
}

.form-control:disabled {
    background-color: var(--color-gray-100);
    opacity: 1;
    cursor: not-allowed;
}

/* 选择框 */
select.form-control {
    cursor: pointer;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='none' stroke='%236c757d' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 16px 12px;
    padding-right: 2.25rem;
}

select.form-control option {
    color: var(--text-body);
    background-color: var(--color-white);
}

/* 文本域 */
textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

/* 表单组 */
.form-group {
    margin-bottom: 1rem;
}

.form-text {
    margin-top: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* 无效反馈 */
.invalid-feedback {
    display: none;
    margin-top: 0.25rem;
    font-size: 0.75rem;
    color: var(--color-danger);
}

.is-invalid ~ .invalid-feedback {
    display: block;
}

.is-invalid {
    border-color: var(--color-danger) !important;
}

.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.15) !important;
}

/* ===== 卡片组件 ===== */
.card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: var(--bg-card);
    background-clip: border-box;
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

.card-header {
    padding: 1rem 1.25rem;
    margin-bottom: 0;
    background-color: transparent;
    border-bottom: 1px solid var(--border-light);
}

.card-title {
    margin-bottom: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-body);
}

.card-body {
    flex: 1 1 auto;
    padding: 1.25rem;
}

.card-footer {
    padding: 1rem 1.25rem;
    background-color: var(--color-gray-100);
    border-top: 1px solid var(--border-light);
}

/* ===== 表格组件 ===== */
.table-container {
    overflow-x: auto;
    background-color: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-lg);
}

.table {
    width: 100%;
    margin-bottom: 0;
    font-size: 0.875rem;
    border-collapse: collapse;
}

.table thead {
    background-color: var(--color-gray-100);
}

.table th {
    padding: 0.75rem 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.table tbody tr:hover {
    background-color: var(--color-gray-100);
}

/* 表格复选框 */
.table input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

/* ===== 状态标签 ===== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    line-height: 1;
    border-radius: var(--border-radius-pill);
}

.badge-primary {
    color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.badge-success {
    color: var(--color-success);
    background-color: var(--color-success-light);
}

.badge-danger {
    color: var(--color-danger);
    background-color: var(--color-danger-light);
}

.badge-warning {
    color: #997404;
    background-color: var(--color-warning-light);
}

.badge-info {
    color: #055160;
    background-color: var(--color-info-light);
}

.badge-secondary {
    color: var(--text-muted);
    background-color: var(--color-gray-200);
}

/* ===== 分页组件 ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.25rem;
    margin-top: 1.5rem;
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 0.75rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-body);
    text-decoration: none;
    background-color: var(--color-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.page-link:hover:not(.disabled):not(.active) {
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-400);
}

.page-link.active {
    color: var(--color-white);
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.page-link.disabled {
    color: var(--text-light);
    pointer-events: none;
    background-color: var(--color-white);
}

/* ===== 开关组件 ===== */
.form-check-input {
    width: 1em;
    height: 1em;
    margin-top: 0.25em;
    vertical-align: top;
    background-color: var(--color-white);
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    border: 1px solid var(--text-muted);
    appearance: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

.form-check-input:checked {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.form-switch {
    padding-left: 2.5em;
}

.form-switch .form-check-input {
    width: 2em;
    height: 1.2em;
    margin-left: -2.5em;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3E%3Ccircle r='3' fill='%23fff'/%3E%3C/svg%3E");
    background-position: left center;
    border-radius: 2em;
    transition: background-position 0.15s ease;
}

.form-switch .form-check-input:checked {
    background-position: right center;
}

/* ===== 加载动画 ===== */
.spinner-border {
    display: inline-block;
    width: 1.25rem;
    height: 1.25rem;
    vertical-align: -0.125em;
    border: 0.2em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner-border 0.75s linear infinite;
}

@keyframes spinner-border {
    to { transform: rotate(360deg); }
}

/* ===== 工具类 ===== */
/* 文字对齐 */
.text-left { text-align: left !important; }
.text-center { text-align: center !important; }
.text-right { text-align: right !important; }

/* 显示控制 */
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-inline-flex { display: inline-flex !important; }

/* Flex布局 */
.flex-row { flex-direction: row !important; }
.flex-column { flex-direction: column !important; }
.justify-start { justify-content: flex-start !important; }
.justify-end { justify-content: flex-end !important; }
.justify-center { justify-content: center !important; }
.justify-between { justify-content: space-between !important; }
.align-start { align-items: flex-start !important; }
.align-center { align-items: center !important; }
.align-end { align-items: flex-end !important; }
.flex-wrap { flex-wrap: wrap !important; }
.gap-1 { gap: 0.25rem !important; }
.gap-2 { gap: 0.5rem !important; }
.gap-3 { gap: 1rem !important; }
.gap-4 { gap: 1.5rem !important; }

/* 间距 */
.m-0 { margin: 0 !important; }
.m-1 { margin: 0.25rem !important; }
.m-2 { margin: 0.5rem !important; }
.m-3 { margin: 1rem !important; }
.m-4 { margin: 1.5rem !important; }
.mt-2 { margin-top: 0.5rem !important; }
.mt-3 { margin-top: 1rem !important; }
.mb-2 { margin-bottom: 0.5rem !important; }
.mb-3 { margin-bottom: 1rem !important; }
.mb-4 { margin-bottom: 1.5rem !important; }

.p-0 { padding: 0 !important; }
.p-2 { padding: 0.5rem !important; }
.p-3 { padding: 1rem !important; }
.p-4 { padding: 1.5rem !important; }

/* 宽度 */
.w-100 { width: 100% !important; }

/* 圆角 */
.rounded { border-radius: var(--border-radius) !important; }
.rounded-lg { border-radius: var(--border-radius-lg) !important; }
.rounded-pill { border-radius: var(--border-radius-pill) !important; }

/* 动画 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.2s ease;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}