/* ============================================================
 * 小学生口算题生成器 · 专用样式
 * - 控制面板：彩色卡片，移动端友好
 * - 题纸：A4 友好布局，@media print 把控制面板隐藏
 * ============================================================ */

/* —— 配置面板 —— */
.km-config {
    background: linear-gradient(135deg, #fff8eb, #fff);
    border: 1px solid #ffe5a3;
    border-radius: 14px;
    padding: 18px 20px;
    margin-bottom: 16px;
}
.km-config h3 {
    margin: 0 0 12px;
    font-size: 17px;
    color: #2c3e50;
    border-left: 4px solid #ff9f43;
    padding-left: 12px;
}
.km-mode-tabs {
    display: flex; gap: 8px; margin-bottom: 14px;
}
.km-mode-tabs label {
    flex: 1; cursor: pointer;
    padding: 9px 12px;
    background: #fff;
    border: 1.5px solid #f5dcb0;
    border-radius: 9px;
    font-weight: 600; font-size: 14px; color: #6a5320;
    text-align: center; transition: all .2s;
    user-select: none;
}
.km-mode-tabs input[type="radio"] { display: none; }
.km-mode-tabs input[type="radio"]:checked + label,
.km-mode-tabs label:has(input:checked) {
    background: linear-gradient(135deg, #ffb347, #ff9f43);
    color: #fff; border-color: #ff9f43;
    box-shadow: 0 3px 10px rgba(255,159,67,.3);
}

.km-row {
    display: flex; flex-wrap: wrap; gap: 12px 16px;
    margin-bottom: 12px;
    align-items: center;
}
.km-row:last-child { margin-bottom: 0; }
.km-field { display: flex; align-items: center; gap: 6px; }
.km-field label {
    font-size: 13px; color: #5a6573; font-weight: 500;
    margin: 0; white-space: nowrap;
}
.km-field input[type="text"],
.km-field input[type="number"],
.km-field select {
    padding: 6px 10px; border: 1px solid #e0d4b5;
    border-radius: 6px; font-size: 13px;
    background: #fff;
}
.km-field select { min-width: 200px; }
.km-field input[type="text"] { width: 110px; }
.km-field input[type="number"] { width: 70px; }

/* 复选框 / 单选 */
.km-check {
    display: inline-flex; align-items: center; gap: 5px;
    cursor: pointer; padding: 4px 10px;
    background: #fff; border: 1px solid #e0d4b5; border-radius: 6px;
    font-size: 13px; color: #5a6573;
    transition: all .15s; user-select: none;
}
.km-check input { margin: 0; cursor: pointer; }
.km-check:hover { border-color: #ff9f43; color: #cc7c00; }
.km-check input:checked + span,
.km-check:has(input:checked) {
    background: linear-gradient(135deg, #fff4d6, #ffe5a3);
    border-color: #ff9f43; color: #6a4500; font-weight: 600;
}

/* —— 操作按钮组 —— */
.km-actions {
    display: flex; flex-wrap: wrap; gap: 10px;
    margin: 14px 0 18px;
    padding: 14px; background: #f9fafd;
    border: 1px solid #e6e9ef; border-radius: 10px;
}
.km-actions button {
    padding: 9px 16px; border: 1.5px solid transparent;
    border-radius: 8px; font-size: 13.5px; font-weight: 600;
    cursor: pointer; transition: all .2s;
    background: #fff; color: #444;
}
.km-actions .km-btn-primary {
    background: linear-gradient(135deg, #ff9f43, #ff7e29);
    color: #fff; border-color: transparent;
    box-shadow: 0 3px 10px rgba(255,126,41,.25);
}
.km-actions .km-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(255,126,41,.4); }
.km-actions .km-btn-print {
    background: linear-gradient(135deg, #5cb85c, #4cae4c);
    color: #fff;
}
.km-actions .km-btn-print:hover { transform: translateY(-2px); }
.km-actions button:not(.km-btn-primary):not(.km-btn-print):hover {
    border-color: #ff9f43; color: #cc7c00;
}

/* 计时器 */
.km-timer {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 14px; background: #fff;
    border: 1.5px solid #e6e9ef; border-radius: 8px;
    font-family: "Menlo","Consolas",monospace;
}
.km-timer .km-tval {
    font-size: 18px; font-weight: 700; color: #2c3e50;
    letter-spacing: 1px; min-width: 56px;
}

/* —— 题纸（A4 友好）—— */
.km-sheet {
    background: #fff; border: 1px solid #ddd;
    border-radius: 10px; padding: 24px 28px;
    box-shadow: 0 2px 14px rgba(0,0,0,.05);
    margin-bottom: 20px;
    /* A4 比例视觉提示：宽度限制类似 A4 */
    max-width: 820px; margin-left: auto; margin-right: auto;
}
.km-sheet-header {
    display: flex; flex-wrap: wrap; gap: 14px 30px;
    align-items: baseline; padding-bottom: 14px;
    border-bottom: 2px solid #2c3e50; margin-bottom: 18px;
}
.km-sheet-header .km-stitle {
    font-size: 22px; font-weight: 800; color: #2c3e50;
    flex: 0 0 auto;
}
.km-sheet-header .km-smeta {
    display: flex; gap: 16px 24px; flex-wrap: wrap;
    flex: 1; justify-content: flex-end;
    font-size: 13px; color: #5a6573;
}
.km-sheet-header .km-smeta span { display: inline-block; }
.km-sheet-header .km-smeta .km-line {
    border-bottom: 1px solid #999; min-width: 80px;
    display: inline-block; padding: 0 4px;
}

/* 题目网格 */
.km-grid {
    display: grid; gap: 10px 18px;
    line-height: 1.85;
    font-family: "Menlo","Consolas","SF Mono","DejaVu Sans Mono",
                 "PingFang SC","Microsoft YaHei",monospace;
}
.km-q {
    display: flex; align-items: baseline; gap: 4px;
    padding: 4px 0;
    page-break-inside: avoid; -webkit-column-break-inside: avoid;
    white-space: nowrap; overflow: hidden;
}
.km-q .km-no {
    flex: 0 0 auto; color: #999;
    font-weight: 500; font-size: .82em; min-width: 1.6em;
}
.km-q .km-mark {
    flex: 0 0 auto; cursor: pointer; padding: 0 4px;
    font-size: .8em; color: #ddd;
    transition: color .15s; user-select: none;
}
.km-q .km-mark:hover { color: #ff5e62; }
.km-q.km-wrong .km-mark { color: #ff5e62; }
.km-q.km-wrong .km-mark::before { content: '❌'; }
.km-q.km-wrong .km-mark { font-size: 1em; }
.km-q .km-expr {
    color: #2c3e50; font-weight: 500;
}
.km-q .km-ans-blank { color: #aaa; letter-spacing: 1px; }
.km-q .km-ans-shown { color: #cc4343; font-weight: 700; }
.km-q.km-wrong { background: #fff8f8; border-radius: 4px; padding-left: 4px; }

/* —— 底部小贴士 —— */
.km-tip {
    margin-top: 14px; padding: 12px 16px;
    background: #f4f8fb; border-left: 3px solid #4f8cff;
    border-radius: 6px;
    font-size: 13px; color: #5a6573; line-height: 1.7;
}
.km-tip strong { color: #2c3e50; }

/* —— 响应式（移动端）—— */
@media (max-width: 768px) {
    .km-config { padding: 14px 14px; }
    .km-config h3 { font-size: 15px; }
    .km-mode-tabs label { padding: 8px 6px; font-size: 13px; }
    .km-row { gap: 10px 12px; }
    .km-field label { font-size: 12.5px; }
    .km-field select { min-width: 160px; }
    .km-field input[type="text"] { width: 90px; }
    .km-field input[type="number"] { width: 60px; }
    .km-actions { padding: 10px; gap: 8px; }
    .km-actions button { padding: 8px 12px; font-size: 12.5px; flex: 1 1 calc(50% - 4px); min-width: 0; }
    .km-actions .km-timer { flex: 1 1 100%; justify-content: center; }
    .km-sheet { padding: 16px 14px; }
    .km-sheet-header .km-stitle { font-size: 17px; }
    .km-sheet-header .km-smeta { font-size: 11.5px; gap: 8px 14px; }
    .km-grid { gap: 8px 10px; }
}

/* —— 打印模式：纯净 A4 输出 —— */
@media print {
    body { background: #fff; }
    /* 隐藏一切非题纸的内容 */
    .navbar, .breadcrumb, .km-config, .km-actions,
    #floatingContactCta, #mobileTabBar, .m-tabbar, nav.m-tabbar,
    #toolFavBtn,
    .copyright-area, .footer-area, footer, .km-tip,
    .qz-info-fold, .contact-cta, .float-cta,
    .container > div:not(.km-sheet) {
        display: none !important;
    }
    /* container 撑满页面 */
    .container, .container-fluid { width: 100% !important; max-width: none !important; padding: 0 !important; margin: 0 !important; }
    .km-sheet {
        box-shadow: none; border: none;
        max-width: none; margin: 0; padding: 12mm 10mm 8mm;
    }
    .km-sheet-header {
        margin-bottom: 12px; padding-bottom: 8px;
        border-bottom-width: 1px;
    }
    .km-sheet-header .km-stitle { font-size: 18px; }
    .km-sheet-header .km-smeta { font-size: 11px; }
    .km-grid {
        line-height: 1.95;
        gap: 6px 14px;
    }
    .km-q .km-mark { display: none; }
    .km-q .km-no { color: #999; font-size: .8em; }
    .km-q .km-ans-blank { color: #444; }
    /* 答案版（如果用户切到了显示答案再打印，颜色突出）*/
    .km-q .km-ans-shown { color: #b00; }
    /* 让题目尽量不在跨页处断开 */
    .km-q { page-break-inside: avoid; -webkit-column-break-inside: avoid; }
    /* 减少全局页眉页脚的痕迹（浏览器自带页眉默认在打印对话框关）*/
    @page { margin: 8mm 10mm; }
}