/* 经典主题：保持当前暗色科幻风格作为默认皮肤
 * 使用变量控制 admin_* 和 um_* 颜色，供各页面与组件引用
 */

body.theme-classic {
    /* 顶部导航 / 布局相关变量（对应 admin_header.css 中的使用） */
    --admin-bg-primary: #0f172a;        /* 整体背景：深蓝灰 */
    --admin-bg-secondary: #111827;      /* 次级背景 */
    --admin-bg-card: #111827;           /* 顶部导航、卡片背景 */
    --admin-bg-hover: #1f2937;          /* 导航/菜单 hover 背景 */
    --admin-text-primary: #e5e7eb;      /* 主文字 */
    --admin-text-secondary: #9ca3af;    /* 次要文字 */
    --admin-accent-primary: #3b82f6;    /* 主色蓝 */
    --admin-accent-hover: #2563eb;      /* hover 蓝 */
    --admin-border-color: #1f2937;      /* 边框/分割线 */
    --admin-success-color: #22c55e;     /* 成功 */
    --admin-warning-color: #f97316;     /* 警告 */
    --admin-error-color: #ef4444;       /* 错误 */
    --admin-nav-active-text: #ffffff;   /* 导航激活文字颜色 */
    --layout-main-columns: minmax(0, 3fr) minmax(0, 7fr);

    /* 管理页通用变量（对应 user_manager.css 等使用的 --um-* 系列） */
    --um-bg-primary: #020617;           /* 页面底层背景 */
    --um-bg-secondary: #020617;
    --um-bg-panel: #0b1120;             /* 列表/详情卡片背景 */
    --um-bg-hover: #111827;             /* hover 背景 */
    --um-border: #1f2937;               /* 卡片和分割线边框 */
    --um-text-primary: #e5e7eb;         /* 面板主文字 */
    --um-text-secondary: #9ca3af;       /* 面板次要文字 */
    --um-text-on-accent: #f9fafb;       /* 高亮渐变背景上的文字颜色 */
    --um-accent: #3b82f6;               /* 通用主色 */
    --um-accent-hover: #2563eb;
    --um-danger: #f97373;
    --um-success: #22c55e;
    --um-shadow: 0 16px 40px rgba(15, 23, 42, 0.55); /* 柔和阴影 */
    --fibq-blank-bg: rgba(37, 99, 235, 0.15);
    --fibq-blank-border: rgba(37, 99, 235, 0.5);
    --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(255, 255, 255, 0.04);
    --um-item-selected-bg: rgba(102, 115, 255, 0.2);
    --um-item-selected-border: rgba(102, 115, 255, 0.35);

    --um-badge-bg: rgba(102, 115, 255, 0.15);
    --um-badge-color: var(--um-accent);
    --um-badge-inactive-bg: rgba(156, 163, 175, 0.15);
    --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, 0.25), rgba(52, 211, 153, 0.15));
    --qtype-single-border: rgba(16, 185, 129, 0.4);

    --qtype-multiple-color: #c4b5fd;
    --qtype-multiple-bg: linear-gradient(135deg, rgba(139, 92, 246, 0.25), rgba(167, 139, 250, 0.15));
    --qtype-multiple-border: rgba(139, 92, 246, 0.4);

    --qtype-blank-color: #fcd34d;
    --qtype-blank-bg: linear-gradient(135deg, rgba(245, 158, 11, 0.25), rgba(251, 191, 36, 0.15));
    --qtype-blank-border: rgba(245, 158, 11, 0.4);

    --qtype-matching-color: #fecaca;
    --qtype-matching-bg: linear-gradient(135deg, rgba(248, 113, 113, 0.25), rgba(239, 68, 68, 0.15));
    --qtype-matching-border: rgba(248, 113, 113, 0.6);

    --qtype-tf-color: #93c5fd;
    --qtype-tf-bg: linear-gradient(135deg, rgba(59, 130, 246, 0.25), rgba(96, 165, 250, 0.15));
    --qtype-tf-border: rgba(59, 130, 246, 0.4);

    --qtype-unknown-color: #94a3b8;
    --qtype-unknown-bg: linear-gradient(135deg, rgba(100, 116, 139, 0.25), rgba(148, 163, 184, 0.15));
    --qtype-unknown-border: rgba(100, 116, 139, 0.4);

    --um-history-created-color: #2563eb;
    --um-history-created-bg: rgba(37, 99, 235, 0.1);
    --um-history-time-color: #059669;
    --um-history-time-bg: rgba(5, 150, 105, 0.1);

    /* 班级管理页专用配色（cm- 前缀） */
    --cm-btn-hover-bg: rgba(102, 115, 255, 0.15);
    --cm-btn-hover-border: rgba(102, 115, 255, 0.3);

    --cm-primary-btn-shadow: 0 8px 18px rgba(102, 115, 255, 0.25);
    --cm-primary-btn-shadow-hover: 0 12px 24px rgba(102, 115, 255, 0.3);
    --cm-ghost-btn-hover-bg: rgba(255, 255, 255, 0.05);
    --cm-outline-btn-border-color: rgba(229, 231, 235, 0.2);

    --cm-accent-btn-bg: linear-gradient(135deg, #10b981, #059669);
    --cm-accent-btn-bg-hover: linear-gradient(135deg, #059669, #047857);
    --cm-accent-btn-shadow: 0 8px 18px rgba(16, 185, 129, 0.25);
    --cm-accent-btn-shadow-hover: 0 12px 24px rgba(16, 185, 129, 0.35);

    --cm-danger-btn-bg: rgba(248, 113, 113, 0.15);
    --cm-danger-btn-bg-hover: rgba(248, 113, 113, 0.25);
    --cm-danger-btn-color: #fca5a5;

    --cm-panel-header-border: rgba(36, 48, 76, 0.9);
    --cm-panel-border-soft: rgba(36, 48, 76, 0.5);

    --cm-empty-border: rgba(255, 255, 255, 0.08);
	--cm-seat-border: rgba(148, 163, 184, 0.85);

    --cm-tree-node-hover-bg: rgba(255, 255, 255, 0.04);
    --cm-tree-node-focused-bg: rgba(102, 115, 255, 0.2);
    --cm-tree-node-focused-border: rgba(102, 115, 255, 0.35);
    --cm-tree-children-border: rgba(255, 255, 255, 0.06);

    --cm-node-toggle-border: rgba(255, 255, 255, 0.08);
    --cm-node-toggle-bg: rgba(255, 255, 255, 0.04);
    --cm-node-toggle-border-hover: rgba(255, 255, 255, 0.2);
    --cm-node-meta-bg: rgba(255, 255, 255, 0.05);

    --cm-footer-bg: rgba(20, 29, 51, 0.95);

    --cm-modal-overlay-bg: rgba(7, 7, 12, 0.65);
    --cm-modal-bg: rgba(20, 29, 51, 0.97);
    --cm-modal-border: rgba(36, 48, 76, 0.9);
    --cm-modal-header-border: rgba(36, 48, 76, 0.8);
    --cm-modal-footer-border: rgba(36, 48, 76, 0.8);
    --cm-modal-tree-border: rgba(36, 48, 76, 0.8);
    --cm-modal-tree-bg: rgba(15, 20, 35, 0.5);

	/* 班级成员座位图面板与渐变（classic 深色科幻风格） */
	--cm-seating-panel-bg: rgba(17, 24, 43, 0.6);
	--cm-seating-stage-gradient-start: rgba(102, 115, 255, 0.2);
	--cm-seating-stage-gradient-end: rgba(139, 92, 246, 0.2);
	--cm-seat-occupied-gradient-start: rgba(102, 115, 255, 0.3);
	--cm-seat-occupied-gradient-end: rgba(139, 92, 246, 0.3);
	--cm-member-field-readonly-bg: rgba(255, 255, 255, 0.02);

    --cm-checkbox-border: rgba(36, 48, 76, 0.9);
    --cm-checkbox-bg: rgba(15, 20, 35, 0.8);
    --cm-checkbox-hover-border: rgba(102, 115, 255, 0.4);
    --cm-checkbox-hover-bg: rgba(15, 20, 35, 0.9);

    --cm-input-readonly-bg: rgba(15, 20, 35, 0.6);
    --cm-input-focus-shadow: 0 0 0 3px rgba(102, 115, 255, 0.18);

    --cm-history-created-color: #2563eb;
    --cm-history-created-bg: rgba(37, 99, 235, 0.1);
    --cm-history-time-color: #059669;
    --cm-history-time-bg: rgba(5, 150, 105, 0.1);

    --admin-theme-id: classic;
}

/* ========== 经典主题下的基础控件（按钮 / 输入框 / 列表 / 下拉） ========== */

/* 顶部按钮（header 区域） */
body.theme-classic .admin-btn {
    border-radius: 6px;
    font-weight: 500;
}

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

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

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

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

body.theme-classic .admin-btn--outline {
    border-color: var(--admin-error-color);
    color: var(--admin-error-color);
}

/* 通用按钮（各管理页 .um-btn） */
body.theme-classic .um-btn {
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(30, 64, 175, 0.9));
    border-color: rgba(148, 163, 184, 0.4);
    color: var(--um-text-primary);
}

body.theme-classic .um-btn:hover {
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.98), rgba(79, 70, 229, 0.98));
    border-color: rgba(129, 140, 248, 0.85);
}

body.theme-classic .um-btn--primary {
    background: linear-gradient(135deg, var(--um-accent), #8b5cf6);
    border-color: rgba(129, 140, 248, 0.9);
    color: #ffffff;
}

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

body.theme-classic .um-btn--danger {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.95), rgba(248, 113, 113, 0.95));
    border-color: rgba(248, 113, 113, 0.9);
    color: #fee2e2;
}

/* 输入框 / 下拉框 */
body.theme-classic .um-input,
body.theme-classic .um-select,
body.theme-classic select,
body.theme-classic input[type="text"],
body.theme-classic input[type="number"],
body.theme-classic input[type="url"],
body.theme-classic textarea {
    background-color: rgba(15, 20, 35, 0.8);
    border: 1px solid rgba(36, 48, 76, 0.9);
    color: var(--um-text-primary);
}

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

body.theme-classic .um-input:focus,
body.theme-classic .um-select:focus,
body.theme-classic select:focus,
body.theme-classic input:focus,
body.theme-classic textarea:focus {
    border-color: var(--um-accent);
    box-shadow: 0 0 0 1px rgba(102, 115, 255, 0.55);
    outline: none;
}

/* 列表/面板背景 */
body.theme-classic .um-list-panel,
body.theme-classic .um-detail-panel,
body.theme-classic .um-modal__content {
    background: rgba(20, 29, 51, 0.85);
    border-color: rgba(36, 48, 76, 0.9);
    box-shadow: var(--um-shadow);
}

/* 通用列表项：用户项 / 树节点等 */
body.theme-classic .um-user-item__name,
body.theme-classic .um-node__label {
    color: var(--um-text-primary);
}

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

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

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