/* 暗色主题：比经典主题更深的背景和更高对比度 */

body.theme-dark {
    /* 顶部导航 / 布局变量 */
    --admin-bg-primary: #020617;
    --admin-bg-secondary: #020617;
    --admin-bg-card: #0b1120;
    --admin-bg-hover: #111827;
    --admin-text-primary: #e5e7eb;
    --admin-text-secondary: #9ca3af;
    --admin-accent-primary: #3b82f6;
    --admin-accent-hover: #60a5fa;
    --admin-border-color: #1f2933;
    --admin-success-color: #22c55e;
    --admin-warning-color: #eab308;
    --admin-error-color: #fb7185;
    --layout-main-columns: minmax(0, 3fr) minmax(0, 7fr);
    --admin-nav-active-text: #ffffff;   /* 导航激活文字颜色 */

    /* 管理页通用变量 */
    --um-bg-primary: #020617;
    --um-bg-secondary: #020617;
    --um-bg-panel: #020617;
    --um-bg-hover: #111827;
    --um-border: #1e293b;
    --um-text-primary: #e5e7eb;
    --um-text-secondary: #9ca3af;
    --um-text-on-accent: #f9fafb;
    --um-accent: #60a5fa;
    --um-accent-hover: #93c5fd;
    --um-danger: #fb7185;
    --um-success: #22c55e;
    --um-shadow: 0 18px 40px rgba(15, 23, 42, 0.9);
    --fibq-blank-bg: rgba(37, 99, 235, 0.22);
    --fibq-blank-border: rgba(96, 165, 250, 0.7);
    --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(248, 250, 252, 0.05);
    --um-item-selected-bg: rgba(59, 130, 246, 0.3);
    --um-item-selected-border: rgba(191, 219, 254, 0.7);

    --um-badge-bg: rgba(37, 99, 235, 0.25);
    --um-badge-color: #93c5fd;
    --um-badge-inactive-bg: rgba(148, 163, 184, 0.25);
    --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: #6ee7b7;
    --qtype-single-bg: linear-gradient(135deg, rgba(16, 185, 129, 0.3), rgba(34, 197, 94, 0.18));
    --qtype-single-border: rgba(16, 185, 129, 0.6);

    --qtype-multiple-color: #ddd6fe;
    --qtype-multiple-bg: linear-gradient(135deg, rgba(129, 140, 248, 0.3), rgba(167, 139, 250, 0.18));
    --qtype-multiple-border: rgba(129, 140, 248, 0.65);

    --qtype-blank-color: #facc15;
    --qtype-blank-bg: linear-gradient(135deg, rgba(245, 158, 11, 0.3), rgba(250, 204, 21, 0.18));
    --qtype-blank-border: rgba(245, 158, 11, 0.65);

    --qtype-matching-color: #fecaca;
    --qtype-matching-bg: linear-gradient(135deg, rgba(248, 113, 113, 0.3), rgba(239, 68, 68, 0.2));
    --qtype-matching-border: rgba(248, 113, 113, 0.7);

    --qtype-tf-color: #bfdbfe;
    --qtype-tf-bg: linear-gradient(135deg, rgba(59, 130, 246, 0.3), rgba(96, 165, 250, 0.2));
    --qtype-tf-border: rgba(59, 130, 246, 0.7);

    --qtype-unknown-color: #9ca3af;
    --qtype-unknown-bg: linear-gradient(135deg, rgba(100, 116, 139, 0.3), rgba(148, 163, 184, 0.2));
    --qtype-unknown-border: rgba(100, 116, 139, 0.6);

    --um-history-created-color: #93c5fd;
    --um-history-created-bg: rgba(37, 99, 235, 0.25);
    --um-history-time-color: #4ade80;
    --um-history-time-bg: rgba(21, 128, 61, 0.3);

    /* 班级管理页专用配色（cm- 前缀） */
    --cm-btn-hover-bg: rgba(37, 99, 235, 0.3);
    --cm-btn-hover-border: rgba(191, 219, 254, 0.7);

    --cm-primary-btn-shadow: 0 10px 24px rgba(37, 99, 235, 0.45);
    --cm-primary-btn-shadow-hover: 0 14px 32px rgba(37, 99, 235, 0.55);
    --cm-ghost-btn-hover-bg: rgba(15, 23, 42, 0.9);
    --cm-outline-btn-border-color: rgba(148, 163, 184, 0.45);

    --cm-accent-btn-bg: linear-gradient(135deg, #22c55e, #16a34a);
    --cm-accent-btn-bg-hover: linear-gradient(135deg, #16a34a, #15803d);
    --cm-accent-btn-shadow: 0 10px 26px rgba(34, 197, 94, 0.35);
    --cm-accent-btn-shadow-hover: 0 14px 32px rgba(34, 197, 94, 0.45);

    --cm-danger-btn-bg: rgba(248, 113, 113, 0.25);
    --cm-danger-btn-bg-hover: rgba(248, 113, 113, 0.35);
    --cm-danger-btn-color: #fecaca;

    --cm-panel-header-border: #1e293b;
    --cm-panel-border-soft: #1f2933;

    --cm-empty-border: rgba(148, 163, 184, 0.35);
	--cm-seat-border: rgba(148, 163, 184, 0.8);

    --cm-tree-node-hover-bg: rgba(248, 250, 252, 0.05);
    --cm-tree-node-focused-bg: rgba(59, 130, 246, 0.3);
    --cm-tree-node-focused-border: rgba(191, 219, 254, 0.7);
    --cm-tree-children-border: rgba(30, 64, 175, 0.6);

    --cm-node-toggle-border: rgba(148, 163, 184, 0.35);
    --cm-node-toggle-bg: rgba(15, 23, 42, 0.9);
    --cm-node-toggle-border-hover: rgba(191, 219, 254, 0.7);
    --cm-node-meta-bg: rgba(15, 23, 42, 0.9);

    --cm-footer-bg: rgba(15, 23, 42, 0.98);

    --cm-modal-overlay-bg: rgba(2, 6, 23, 0.7);
    --cm-modal-bg: #020617;
    --cm-modal-border: #1e293b;
    --cm-modal-header-border: #1f2933;
    --cm-modal-footer-border: #1f2933;
    --cm-modal-tree-border: #1f2933;
    --cm-modal-tree-bg: #020617;

    --cm-checkbox-border: #1e293b;
    --cm-checkbox-bg: #020617;
    --cm-checkbox-hover-border: rgba(96, 165, 250, 0.8);
    --cm-checkbox-hover-bg: #020617;

    --cm-history-created-color: #93c5fd;
    --cm-history-created-bg: rgba(37, 99, 235, 0.25);
    --cm-history-time-color: #4ade80;
    --cm-history-time-bg: rgba(21, 128, 61, 0.3);

    --cm-input-readonly-bg: rgba(15, 23, 42, 0.85);
    --cm-input-focus-shadow: 0 0 0 3px rgba(96, 165, 250, 0.6);

	/* 班级成员座位图面板与渐变（dark 更深蓝紫风格） */
	--cm-seating-panel-bg: #020617;
	--cm-seating-stage-gradient-start: rgba(37, 99, 235, 0.4);
	--cm-seating-stage-gradient-end: rgba(79, 70, 229, 0.45);
	--cm-seat-occupied-gradient-start: rgba(37, 99, 235, 0.55);
	--cm-seat-occupied-gradient-end: rgba(79, 70, 229, 0.6);
	--cm-member-field-readonly-bg: rgba(15, 23, 42, 0.9);

    --admin-theme-id: dark;
}

/* ========== 暗色主题：基础控件样式 ========== */

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

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

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

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

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

/* 通用按钮 .um-btn */
body.theme-dark .um-btn {
    background-color: #020617;
    border-color: rgba(148, 163, 184, 0.4);
    color: var(--um-text-primary);
}

body.theme-dark .um-btn:hover {
    background-color: #111827;
    border-color: var(--um-accent);
    box-shadow: 0 12px 26px rgba(15, 23, 42, 0.85);
}

body.theme-dark .um-btn--primary {
    background: linear-gradient(135deg, var(--um-accent), #1d4ed8);
    border-color: var(--um-accent);
    color: #ffffff;
    box-shadow: 0 14px 32px rgba(37, 99, 235, 0.6);
}

body.theme-dark .um-btn--ai {
    background-image: linear-gradient(135deg, #22d3ee, #4f46e5);
    border-color: transparent;
    color: #0f172a;
    box-shadow: 0 16px 36px rgba(34, 211, 238, 0.65);
}

body.theme-dark .um-btn--ai:hover {
    filter: brightness(1.08);
    box-shadow: 0 20px 44px rgba(56, 189, 248, 0.85);
}

body.theme-dark .um-btn--danger {
    background-color: rgba(248, 113, 113, 0.25);
    border-color: rgba(252, 165, 165, 0.75);
    color: #fecaca;
}

/* 输入框 / 下拉框 */
body.theme-dark .um-input,
body.theme-dark .um-select,
body.theme-dark select,
body.theme-dark input[type="text"],
body.theme-dark input[type="number"],
body.theme-dark input[type="url"],
body.theme-dark textarea {
    background-color: #020617;
    border: 1px solid var(--um-border);
    color: var(--um-text-primary);
}

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

body.theme-dark .um-input:focus,
body.theme-dark .um-select:focus,
body.theme-dark select:focus,
body.theme-dark input:focus,
body.theme-dark textarea:focus {
    border-color: var(--um-accent);
    box-shadow: 0 0 0 1px rgba(96, 165, 250, 0.55);
    outline: none;
}

/* 列表/面板背景 */
body.theme-dark .um-list-panel,
body.theme-dark .um-detail-panel,
body.theme-dark .um-modal__content {
    background-color: #020617;
    border-color: var(--um-border);
    box-shadow: var(--um-shadow);
}

/* 文本与提示 */
body.theme-dark .um-user-item__name,
body.theme-dark .um-node__label {
    color: var(--um-text-primary);
}

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

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

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