/* ============================================================
   英语启蒙家庭日常对话手册 - 响应式样式
   PC 端：左侧固定目录 + 右侧内容
   移动端：抽屉式目录 + 表格卡片化
   ============================================================ */

:root {
    --primary: #e8734a;
    --primary-light: #fdf1ea;
    --primary-dark: #c95a33;
    --ink: #33393f;
    --ink-light: #6b7480;
    --bg: #f6f4ef;
    --card-bg: #ffffff;
    --border: #ece5da;
    --mom-color: #e07a9a;
    --dad-color: #4a90c4;
    --baby-color: #52b788;
    --topbar-h: 60px;
    --radius: 14px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--ink);
    line-height: 1.7;
    padding-top: var(--topbar-h);
}

/* ---------------- 顶栏 ---------------- */
.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--topbar-h);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 20px;
    z-index: 100;
}

.topbar-title {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: baseline;
    gap: 12px;
    overflow: hidden;
    white-space: nowrap;
}

.topbar-title h1 {
    font-size: 19px;
    color: var(--primary-dark);
    letter-spacing: 1px;
}

.topbar-title p {
    font-size: 12px;
    color: var(--ink-light);
    overflow: hidden;
    text-overflow: ellipsis;
}

.topbar-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 38px;
    height: 38px;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
}

.topbar-menu-btn span {
    display: block;
    height: 2px;
    border-radius: 2px;
    background: var(--ink);
}

.topbar-cn-btn {
    flex-shrink: 0;
    padding: 7px 14px;
    font-size: 13px;
    color: var(--primary-dark);
    background: var(--primary-light);
    border: 1px solid #f3d5c5;
    border-radius: 999px;
    cursor: pointer;
    transition: all 0.2s;
}

.topbar-cn-btn:hover {
    background: #fbe3d4;
}

.topbar-cn-btn.active {
    color: #fff;
    background: var(--primary);
    border-color: var(--primary);
}

/* ---------------- 布局 ---------------- */
.layout {
    display: flex;
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 20px 60px;
    gap: 24px;
    align-items: flex-start;
}

/* ---------------- 目录 ---------------- */
.catalog {
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
    flex-shrink: 0;
    width: 230px;
    max-height: calc(100vh - var(--topbar-h) - 48px);
    overflow-y: auto;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 10px;
}

.catalog-title {
    font-size: 15px;
    color: var(--primary-dark);
    padding: 0 10px 8px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 8px;
}

.catalog-group {
    font-size: 12px;
    color: var(--ink-light);
    padding: 12px 10px 4px;
}

.catalog-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 10px;
    font-size: 13.5px;
    color: var(--ink);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.15s;
}

.catalog-item i {
    flex-shrink: 0;
    font-style: normal;
    font-size: 11px;
    font-weight: 600;
    color: var(--primary);
    background: var(--primary-light);
    border-radius: 6px;
    padding: 1px 6px;
}

.catalog-item:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
}

.catalog-item.active {
    background: var(--primary);
    color: #fff;
}

.catalog-item.active i {
    color: #fff;
    background: rgba(255, 255, 255, 0.25);
}

/* 移动端：抽屉 */
.mask {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 98;
    opacity: 0;
    transition: opacity 0.25s;
}

.mask.show {
    opacity: 1;
}

/* ---------------- 主内容 ---------------- */
.main {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px 30px;
    box-shadow: 0 2px 10px rgba(150, 120, 90, 0.05);
}

/* 使用指南 */
.guide-lead {
    color: var(--primary-dark);
    background: var(--primary-light);
    border-radius: 8px;
    padding: 10px 14px;
    margin-bottom: 14px;
}

.guide-list {
    padding-left: 22px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.guide-list li::marker {
    color: var(--primary);
    font-weight: 600;
}

.guide-note {
    margin-top: 16px;
    padding: 12px 14px;
    border-left: 3px solid var(--primary);
    background: #faf8f4;
    border-radius: 0 8px 8px 0;
    font-size: 14px;
}

/* 场景卡片 */
.scene-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 21px;
    color: var(--ink);
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.scene-no {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 38px;
    height: 38px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), #f2a06b);
    color: #fff;
    font-size: 16px;
    font-weight: 700;
}

.scene-title em {
    font-style: normal;
    font-size: 14px;
    font-weight: 400;
    color: var(--ink-light);
}

.scene-tip {
    font-size: 13.5px;
    color: #8a7a5c;
    background: #fdf8ec;
    border: 1px dashed #ead9b0;
    border-radius: 8px;
    padding: 8px 12px;
    margin-bottom: 18px;
}

/* 区块标题 */
.block-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15.5px;
    margin: 20px 0 10px;
    padding-left: 12px;
    position: relative;
}

.block-title::before {
    content: "";
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 4px;
    border-radius: 2px;
}

.t-dialog {
    color: #3b6e9c;
}

.t-dialog::before {
    background: var(--dad-color);
}

.t-baby {
    color: #37855e;
}

.t-baby::before {
    background: var(--baby-color);
}

.t-word {
    color: var(--primary-dark);
}

.t-word::before {
    background: var(--primary);
}

.t-extra {
    color: #8a6d3b;
}

.t-extra::before {
    background: #d5a94f;
}

.t-sentence {
    color: #7c5aa0;
}

.t-sentence::before {
    background: #9b7ec4;
}

/* ---------------- 表格 ---------------- */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

th,
td {
    padding: 9px 12px;
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid #f1ece4;
}

thead th {
    font-size: 12.5px;
    font-weight: 600;
    color: var(--ink-light);
    background: #faf7f2;
    white-space: nowrap;
}

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

/* 角色列 */
.role {
    white-space: nowrap;
    font-weight: 600;
    font-size: 13px;
}

.role-mom {
    color: var(--mom-color);
}

.role-dad {
    color: var(--dad-color);
}

.role-baby {
    color: var(--baby-color);
}

td.en {
    color: #2f3a45;
    font-weight: 500;
}

td.cn {
    color: var(--ink-light);
}

/* 表格行悬停 */
tbody tr {
    transition: background 0.12s;
}

tbody tr:hover {
    background: #fdf9f4;
}

/* 隐藏中文模式 */
body.hide-cn .cn {
    display: none;
}

body.hide-cn .cn-col {
    display: none;
}

/* ---------------- 21 天节奏 ---------------- */
.plan-table td:first-child {
    white-space: nowrap;
    font-weight: 600;
    color: var(--primary-dark);
    width: 90px;
}

.plan-note {
    margin-top: 16px;
    padding: 12px 14px;
    background: var(--primary-light);
    border-radius: 8px;
    font-size: 14px;
}

.plan-end {
    margin-top: 20px;
    text-align: center;
    color: var(--ink-light);
    font-size: 13px;
}

/* ---------------- 返回顶部 ---------------- */
.back-top {
    position: fixed;
    right: 22px;
    bottom: 30px;
    width: 46px;
    height: 46px;
    border: none;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: 12px;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(232, 115, 74, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: all 0.25s;
    z-index: 99;
}

.back-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-top:hover {
    background: var(--primary-dark);
}

/* ============================================================
   移动端适配
   ============================================================ */
@media (max-width: 900px) {
    .topbar {
        padding: 0 12px;
    }

    .topbar-menu-btn {
        display: flex;
    }

    .topbar-title {
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        line-height: 1.3;
    }

    .topbar-title h1 {
        font-size: 15.5px;
    }

    .topbar-title p {
        display: none;
    }

    .topbar-cn-btn {
        padding: 6px 11px;
        font-size: 12.5px;
    }

    .layout {
        padding: 14px 12px 70px;
    }

    /* 目录变抽屉 */
    .catalog {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 78%;
        max-width: 320px;
        max-height: none;
        border-radius: 0 var(--radius) var(--radius) 0;
        transform: translateX(-105%);
        transition: transform 0.28s ease;
        z-index: 99;
        padding-top: 18px;
    }

    .catalog.open {
        transform: translateX(0);
    }

    .mask.show {
        display: block;
    }

    .card {
        padding: 18px 16px;
        border-radius: 12px;
    }

    .scene-title {
        font-size: 18px;
    }

    .scene-no {
        min-width: 32px;
        height: 32px;
        font-size: 14px;
        border-radius: 8px;
    }

    /* ---- 表格卡片化：每行变成上下堆叠的卡片 ---- */
    .dialog-table thead,
    .word-table thead {
        display: none;
    }

    .dialog-table tbody tr,
    .word-table tbody tr {
        display: block;
        padding: 10px 12px;
        margin-bottom: 8px;
        background: #fbf9f5;
        border: 1px solid #f1ece4;
        border-radius: 10px;
    }

    .dialog-table td,
    .word-table td {
        display: block;
        border-bottom: none;
        padding: 2px 0;
    }

    /* 对话表：角色显示为小标签 */
    .dialog-table td.role {
        display: inline-block;
        font-size: 12px;
        padding: 1px 8px;
        border-radius: 999px;
        margin-bottom: 4px;
    }

    .dialog-table td.role-mom {
        background: #fbe9f0;
    }

    .dialog-table td.role-dad {
        background: #e6f1f9;
    }

    .dialog-table td.role-baby {
        background: #e7f5ee;
    }

    /* 中文列加"译"标识并弱化 */
    .word-table td.cn::before {
        content: "译 ";
        font-size: 11px;
        color: #c8bda9;
    }

    .plan-table td:first-child {
        width: auto;
    }

    .plan-table thead {
        display: none;
    }

    .plan-table tbody tr {
        display: block;
        padding: 10px 12px;
        margin-bottom: 8px;
        background: #fbf9f5;
        border: 1px solid #f1ece4;
        border-radius: 10px;
    }

    .plan-table td {
        display: block;
        border-bottom: none;
        padding: 2px 0;
    }

    .plan-table td:first-child::after {
        content: "";
    }

    .back-top {
        right: 14px;
        bottom: 20px;
        width: 42px;
        height: 42px;
    }
}

/* 隐藏中文模式在移动端：中文行收起后行距更紧凑 */
body.hide-cn .dialog-table td.role {
    margin-bottom: 0;
}

/* 超小屏 */
@media (max-width: 360px) {
    .card {
        padding: 14px 12px;
    }

    .topbar-cn-btn {
        padding: 5px 9px;
    }
}