/* 现代主题：浅色 + 扁平化，适合日间使用 */

body.theme-modern {
    /* 顶部导航 / 布局变量：浅灰蓝背景 + 深色文字 */
    --admin-bg-primary: #f9fafb;
    --admin-bg-secondary: #e5e7eb;
    --admin-bg-card: #ffffff;
    --admin-bg-hover: #e5edff;
    --admin-text-primary: #0f172a;
    --admin-text-secondary: #6b7280;
    --admin-accent-primary: #2563eb;
    --admin-accent-hover: #1d4ed8;
    --admin-border-color: #e5e7eb;
    --admin-success-color: #16a34a;
    --admin-warning-color: #f97316;
    --admin-error-color: #dc2626;
    --layout-main-columns: minmax(0, 3fr) minmax(0, 7fr);
    --admin-nav-active-text: var(--admin-text-primary);   /* 导航激活文字颜色（浅色主题用深色文字） */

    /* 管理页通用变量（与 user_manager.css 等协同） */
    --um-bg-primary: #f9fafb;
    --um-bg-secondary: #eef2ff;
    --um-bg-panel: #ffffff;
    --um-bg-hover: #e5edff;
    --um-border: #e5e7eb;
    --um-text-primary: #0f172a;
    --um-text-secondary: #6b7280;
    --um-text-on-accent: #f9fafb;         /* 高亮渐变背景上的文字颜色（统一用浅色） */
    --um-accent: #2563eb;
    --um-accent-hover: #1d4ed8;
    --um-danger: #dc2626;
    --um-success: #16a34a;
    --um-shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
    --fibq-blank-bg: rgba(37, 99, 235, 0.12);
    --fibq-blank-border: rgba(37, 99, 235, 0.45);
    --mq-line-color: var(--um-accent);

    /* 通用列表 / 徽章 / 历史信息状态色（知识点管理等页面复用） */
    --um-item-hover-bg: rgba(15, 23, 42, 0.03);
    --um-item-selected-bg: rgba(37, 99, 235, 0.12);
    --um-item-selected-border: rgba(37, 99, 235, 0.5);

    --um-badge-bg: rgba(191, 219, 254, 0.9);
    --um-badge-color: #1d4ed8;
    --um-badge-inactive-bg: rgba(229, 231, 235, 0.9);
    --um-badge-inactive-color: var(--um-text-secondary);

    /* 题型标签配色（综合题子题目管理等使用） */
    --qtype-single-color: #15803d;
    --qtype-single-bg: linear-gradient(135deg, rgba(22, 163, 74, 0.12), rgba(34, 197, 94, 0.08));
    --qtype-single-border: rgba(22, 163, 74, 0.45);

    --qtype-multiple-color: #5b21b6;
    --qtype-multiple-bg: linear-gradient(135deg, rgba(129, 140, 248, 0.16), rgba(196, 181, 253, 0.14));
    --qtype-multiple-border: rgba(129, 140, 248, 0.6);

    --qtype-blank-color: #b45309;
    --qtype-blank-bg: linear-gradient(135deg, rgba(245, 158, 11, 0.16), rgba(252, 211, 77, 0.12));
    --qtype-blank-border: rgba(245, 158, 11, 0.6);

    --qtype-matching-color: #b91c1c;
    --qtype-matching-bg: linear-gradient(135deg, rgba(248, 113, 113, 0.16), rgba(254, 202, 202, 0.12));
    --qtype-matching-border: rgba(248, 113, 113, 0.7);

    --qtype-tf-color: #1d4ed8;
    --qtype-tf-bg: linear-gradient(135deg, rgba(37, 99, 235, 0.16), rgba(191, 219, 254, 0.12));
    --qtype-tf-border: rgba(37, 99, 235, 0.6);

    --qtype-unknown-color: #6b7280;
    --qtype-unknown-bg: linear-gradient(135deg, rgba(148, 163, 184, 0.16), rgba(229, 231, 235, 0.12));
    --qtype-unknown-border: rgba(148, 163, 184, 0.6);

    --um-history-created-color: #1d4ed8;
    --um-history-created-bg: rgba(191, 219, 254, 0.9);
    --um-history-time-color: #15803d;
    --um-history-time-bg: rgba(220, 252, 231, 0.9);

    /* 班级管理页专用配色（cm- 前缀） */
    --cm-btn-hover-bg: #dbeafe;
    --cm-btn-hover-border: rgba(37, 99, 235, 0.45);

    --cm-primary-btn-shadow: 0 8px 18px rgba(37, 99, 235, 0.25);
    --cm-primary-btn-shadow-hover: 0 12px 24px rgba(37, 99, 235, 0.3);
    --cm-ghost-btn-hover-bg: rgba(15, 23, 42, 0.03);
    --cm-outline-btn-border-color: rgba(148, 163, 184, 0.6);

    --cm-accent-btn-bg: linear-gradient(135deg, #22c55e, #16a34a);
    --cm-accent-btn-bg-hover: linear-gradient(135deg, #16a34a, #15803d);
    --cm-accent-btn-shadow: 0 8px 18px rgba(22, 163, 74, 0.18);
    --cm-accent-btn-shadow-hover: 0 12px 24px rgba(22, 163, 74, 0.26);

    --cm-danger-btn-bg: rgba(254, 202, 202, 0.7);
    --cm-danger-btn-bg-hover: rgba(254, 226, 226, 0.95);
    --cm-danger-btn-color: #b91c1c;

    --cm-panel-header-border: #e5e7eb;
    --cm-panel-border-soft: #e5e7eb;

    --cm-empty-border: rgba(148, 163, 184, 0.4);
	--cm-seat-border: #cbd5f5;

    --cm-tree-node-hover-bg: rgba(15, 23, 42, 0.03);
    --cm-tree-node-focused-bg: rgba(37, 99, 235, 0.12);
    --cm-tree-node-focused-border: rgba(37, 99, 235, 0.5);
    --cm-tree-children-border: rgba(148, 163, 184, 0.4);

    --cm-node-toggle-border: rgba(148, 163, 184, 0.5);
    --cm-node-toggle-bg: rgba(249, 250, 251, 0.9);
    --cm-node-toggle-border-hover: rgba(37, 99, 235, 0.6);
    --cm-node-meta-bg: rgba(249, 250, 251, 0.9);

    --cm-footer-bg: rgba(243, 244, 246, 0.96);

    --cm-modal-overlay-bg: rgba(15, 23, 42, 0.35);
    --cm-modal-bg: #ffffff;
    --cm-modal-border: #e5e7eb;
    --cm-modal-header-border: #e5e7eb;
    --cm-modal-footer-border: #e5e7eb;
    --cm-modal-tree-border: #e5e7eb;
    --cm-modal-tree-bg: #f3f4ff;

    --cm-checkbox-border: #d1d5db;
    --cm-checkbox-bg: #ffffff;
    --cm-checkbox-hover-border: rgba(37, 99, 235, 0.7);
    --cm-checkbox-hover-bg: #eff6ff;

    --cm-history-created-color: #1d4ed8;
    --cm-history-created-bg: rgba(191, 219, 254, 0.9);
    --cm-history-time-color: #15803d;
    --cm-history-time-bg: rgba(220, 252, 231, 0.9);

    --cm-input-readonly-bg: #f3f4ff;
    --cm-input-focus-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);

	/* 班级成员座位图面板与渐变（modern 浅色蓝灰风格） */
	--cm-seating-panel-bg: var(--um-bg-panel);
	--cm-seating-stage-gradient-start: rgba(191, 219, 254, 0.9);
	--cm-seating-stage-gradient-end: rgba(129, 140, 248, 0.9);
	--cm-seat-occupied-gradient-start: rgba(191, 219, 254, 0.9);
	--cm-seat-occupied-gradient-end: rgba(129, 140, 248, 0.95);
	--cm-member-field-readonly-bg: #eef2ff;

    --admin-theme-id: modern;
}

/* ========== 现代主题：基础控件样式 ========== */

/* 顶部按钮 */
body.theme-modern .admin-btn {
    border-radius: 6px;
    font-weight: 500;
}

body.theme-modern .admin-btn--primary {
    background-color: var(--admin-accent-primary);
    border-color: var(--admin-accent-primary);
    color: #ffffff;
}

body.theme-modern .admin-btn--primary:hover {
    background-color: var(--admin-accent-hover);
    border-color: var(--admin-accent-hover);
}

body.theme-modern .admin-btn--ghost {
    background-color: transparent;
    border-color: var(--admin-border-color);
    color: var(--admin-text-secondary);
}

body.theme-modern .admin-btn--ghost:hover {
    background-color: var(--admin-bg-hover);
    color: var(--admin-text-primary);
}

/* 通用按钮 .um-btn */
body.theme-modern .um-btn {
    background-color: var(--um-bg-hover);
    border-color: var(--um-border);
    color: var(--um-text-primary);
    border-radius: 999px;
}

body.theme-modern .um-btn:hover {
    background-color: #dbeafe;
    border-color: var(--um-accent);
}

body.theme-modern .um-btn--primary {
    background: linear-gradient(135deg, var(--um-accent), #4f46e5);
    border-color: var(--um-accent);
    color: #ffffff;
    box-shadow: 0 8px 18px rgba(37, 99, 235, 0.25);
}

body.theme-modern .um-btn--ai {
    background-image: linear-gradient(135deg, #38bdf8, #6366f1);
    border-color: transparent;
    color: #ffffff;
    box-shadow: 0 10px 24px rgba(59, 130, 246, 0.4);
}

body.theme-modern .um-btn--ai:hover {
    filter: brightness(1.06);
    box-shadow: 0 14px 30px rgba(59, 130, 246, 0.5);
}

body.theme-modern .um-btn--danger {
    background-color: #fee2e2;
    border-color: #fecaca;
    color: #b91c1c;
}

/* 输入框 / 下拉框 */
body.theme-modern .um-input,
body.theme-modern .um-select,
body.theme-modern select,
body.theme-modern input[type="text"],
body.theme-modern input[type="number"],
body.theme-modern input[type="url"],
body.theme-modern textarea {
    background-color: #ffffff;
    border: 1px solid var(--um-border);
    color: var(--um-text-primary);
}

body.theme-modern .um-input::placeholder,
body.theme-modern textarea::placeholder,
body.theme-modern input::placeholder {
    color: var(--um-text-secondary);
}

body.theme-modern .um-input:focus,
body.theme-modern .um-select:focus,
body.theme-modern select:focus,
body.theme-modern input:focus,
body.theme-modern textarea:focus {
    border-color: var(--um-accent);
    box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.4);
    outline: none;
}

/* 列表/面板背景 */
body.theme-modern .um-list-panel,
body.theme-modern .um-detail-panel,
body.theme-modern .um-modal__content {
    background-color: var(--um-bg-panel);
    border-color: var(--um-border);
    box-shadow: var(--um-shadow);
}

/* 列表项文本 */
body.theme-modern .um-user-item__name,
body.theme-modern .um-node__label {
    color: var(--um-text-primary);
}

body.theme-modern .um-user-item__meta,
body.theme-modern .um-page-info,
body.theme-modern .um-page-size-label,
body.theme-modern .um-modal__hint {
    color: var(--um-text-secondary);
}

/* 复选框与必填标记 */
body.theme-modern .um-user-item__checkbox,
body.theme-modern .um-checkbox input[type="checkbox"] {
    accent-color: var(--um-accent);
}

body.theme-modern .um-required {
    color: var(--um-danger);
}