/* 幼儿启蒙跟读学习程序 - 幼儿友好 UI（大字号、大按钮、高对比） */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

:root {
    --c-bg: #fdf6ec;
    --c-card: #ffffff;
    --c-primary: #ff7043;
    --c-text: #37474f;
    --c-sub: #78909c;
    --c-parent: #fff8e1;
    --c-parent-border: #ffca28;
    --shadow: 0 4px 14px rgba(0,0,0,.08);
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    background: var(--c-bg);
    color: var(--c-text);
    min-height: 100vh;
    user-select: none;
}

/* ===== 顶部栏 ===== */
.topbar {
    position: sticky; top: 0; z-index: 10;
    display: flex; align-items: center; gap: 12px;
    padding: 12px 18px;
    background: #fff;
    box-shadow: var(--shadow);
}
.topbar-home {
    border: none; background: #f5f5f5; border-radius: 14px;
    font-size: 18px; padding: 10px 16px; cursor: pointer; color: var(--c-text);
}
.topbar-home span { font-size: 16px; margin-left: 4px; }
.topbar-title {
    flex: 1; text-align: center;
    font-size: 26px; font-weight: 800; letter-spacing: 2px;
}
.mode-toggle {
    border: 2px solid var(--c-primary); background: #fff;
    color: var(--c-primary); border-radius: 20px;
    font-size: 17px; font-weight: 700; padding: 9px 16px; cursor: pointer;
}
.mode-toggle.parent-on {
    background: var(--c-parent-border); border-color: #f57f17; color: #5d4037;
}

/* ===== 视图 ===== */
main { max-width: 1080px; margin: 0 auto; padding: 20px 16px 90px; }
.hidden { display: none !important; }

/* 首页 */
.home-hero { text-align: center; padding: 26px 0 10px; }
.home-hero h1 { font-size: 44px; font-weight: 900; color: var(--c-primary); }
.home-hero p { font-size: 19px; color: var(--c-sub); margin-top: 8px; }
.module-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 22px; margin-top: 28px; }
.module-card {
    background: var(--c-card); border-radius: 28px; padding: 34px 20px;
    text-align: center; cursor: pointer; border: none;
    box-shadow: var(--shadow); transition: transform .15s;
}
.module-card:hover { transform: translateY(-5px); }
.module-card .m-icon { font-size: 76px; display: block; }
.module-card .m-name { font-size: 32px; font-weight: 900; margin-top: 10px; }
.module-card .m-desc { font-size: 17px; color: var(--c-sub); margin-top: 8px; }
.home-foot { text-align: center; color: #b0bec5; font-size: 14px; margin-top: 34px; }

/* ===== 模块页 ===== */
.tabs { display: flex; flex-wrap: wrap; gap: 10px; margin: 6px 0 14px; }
.tab {
    border: 2px solid transparent; background: #fff; border-radius: 18px;
    font-size: 18px; font-weight: 700; padding: 10px 18px; cursor: pointer; color: var(--c-text);
}
.tab.active { border-color: currentColor; }
.section-intro {
    background: #fff; border-radius: 18px; padding: 14px 18px;
    font-size: 17px; color: var(--c-sub); margin-bottom: 12px;
}
.parent-intro {
    background: var(--c-parent); border: 2px dashed var(--c-parent-border);
    border-radius: 18px; padding: 14px 18px; font-size: 16px;
    color: #6d4c41; margin-bottom: 12px; line-height: 1.7;
}

/* 连读控制 */
.autoplay-bar { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; }
.btn-autoplay {
    border: none; background: var(--c-primary); color: #fff;
    font-size: 19px; font-weight: 800; padding: 12px 26px;
    border-radius: 22px; cursor: pointer;
}
.btn-autoplay.playing { background: #ef5350; }
.autoplay-tip { font-size: 15px; color: #b0bec5; }

/* 卡片网格 */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 18px; }
.card {
    background: var(--c-card); border-radius: 24px; padding: 24px 16px;
    text-align: center; cursor: pointer; box-shadow: var(--shadow);
    border: 3px solid transparent; transition: transform .12s, border-color .12s;
    position: relative;
}
.card:hover { transform: scale(1.03); }
.card.speaking { border-color: var(--c-primary); transform: scale(1.05); }
.card .c-text {
    font-size: 46px; font-weight: 900; line-height: 1.25;
    word-break: break-all; white-space: pre-wrap;
}
.card .c-sub { font-size: 18px; color: var(--c-sub); margin-top: 10px; }
.card .c-visual { font-size: 24px; margin-top: 8px; letter-spacing: 2px; }
.card .c-tip {
    display: none; text-align: left;
    margin-top: 14px; padding-top: 12px;
    border-top: 2px dashed #ffe0b2;
    font-size: 14px; line-height: 1.7; color: #795548;
}
body.parent-mode .card .c-tip { display: block; }
.card .c-tip::before { content: "👨‍👩‍👧 家长辅助："; font-weight: 700; color: #ef6c00; }
.card .c-hint { position: absolute; top: 10px; right: 14px; font-size: 20px; opacity: .35; }

/* ===== 底部朗读状态 ===== */
.tts-bar {
    position: fixed; bottom: 0; left: 0; right: 0;
    background: #37474f; color: #fff;
    text-align: center; padding: 12px; font-size: 18px; z-index: 20;
}
.tts-bar b { color: #ffb74d; }

/* 移动端适配 */
@media (max-width: 600px) {
    .topbar-title { font-size: 20px; }
    .module-card .m-icon { font-size: 60px; }
    .card-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
    .card .c-text { font-size: 36px; }
    .mode-toggle { font-size: 15px; padding: 8px 12px; }
    .topbar-home span { display: none; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== v2 新增：统计卡 / 分类难度 chips / 换一批 / 弹窗 / 提示条 ===== */
.topbar-actions { display: flex; align-items: center; gap: 10px; }
.icon-btn {
    border: none; background: #f5f5f5; border-radius: 14px;
    font-size: 20px; padding: 9px 12px; cursor: pointer;
}

.stats-card {
    background: var(--c-card); border-radius: 24px; padding: 20px 22px;
    box-shadow: var(--shadow); margin-top: 20px;
}
.stats-title { font-size: 20px; font-weight: 800; margin-bottom: 14px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.stat-item { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.stat-num { font-size: 32px; font-weight: 900; color: var(--c-primary); }
.stat-label { font-size: 13px; color: var(--c-sub); }
.week-bars {
    display: flex; justify-content: space-between; align-items: flex-end;
    margin-top: 18px; padding-top: 14px; border-top: 2px dashed #eee;
}
.week-bar-col { display: flex; flex-direction: column; align-items: center; gap: 5px; }
.week-bar { width: 22px; background: #ffb74d; border-radius: 6px 6px 0 0; min-height: 4px; }
.week-bar-label { font-size: 11px; color: #b0bec5; }

.chips-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 12px; }
.chip {
    border: 2px solid transparent; background: #fff; border-radius: 16px;
    font-size: 16px; font-weight: 700; padding: 8px 14px; cursor: pointer; color: var(--c-text);
}
.chip.active { border-color: var(--c-primary); color: var(--c-primary); background: #fff3e0; }

.btn-refresh {
    border: none; background: #42a5f5; color: #fff;
    font-size: 19px; font-weight: 800; padding: 12px 26px;
    border-radius: 22px; cursor: pointer;
}
.btn-refresh:active { transform: scale(0.96); }

.card .c-approx { font-size: 15px; color: #7e57c2; margin-top: 8px; }

.toast {
    position: fixed; top: 74px; left: 50%; transform: translateX(-50%);
    background: #37474f; color: #fff; font-size: 16px;
    padding: 12px 22px; border-radius: 20px; z-index: 50;
    box-shadow: var(--shadow); white-space: nowrap;
}

.modal {
    position: fixed; inset: 0; background: rgba(0,0,0,.4);
    z-index: 60; display: flex; align-items: center; justify-content: center;
    padding: 18px;
}
.modal-box {
    background: #fff; border-radius: 24px; padding: 26px;
    width: 100%; max-width: 460px; max-height: 86vh; overflow-y: auto;
}
.modal-box h2 { font-size: 24px; margin-bottom: 18px; }
.set-row { margin-bottom: 16px; }
.set-row label { display: block; font-size: 16px; font-weight: 700; margin-bottom: 8px; color: var(--c-text); }
.set-row select {
    width: 100%; font-size: 15px; padding: 10px; border-radius: 12px;
    border: 2px solid #e0e0e0; background: #fafafa;
}
.preset-btns { display: flex; gap: 10px; }
.preset-btns button {
    flex: 1; border: 2px solid #e0e0e0; background: #fafafa; border-radius: 14px;
    font-size: 16px; font-weight: 700; padding: 10px 0; cursor: pointer;
}
.preset-btns button:active { border-color: var(--c-primary); }
.set-row input[type=range] { width: 100%; }
.set-note {
    font-size: 13px; color: #b0bec5; line-height: 1.7;
    background: #fafafa; border-radius: 12px; padding: 10px; margin-bottom: 16px;
}