/* Earthworm 极简风格 - 支持暗黑主题（参考 Linear / shadcn / Vercel 调色板） */
:root {
    /* 浅色：基于 zinc 中性色 + indigo 主色 */
    --bg: #fafafa;
    --card-bg: #ffffff;
    --input-bg: #ffffff;
    --hover-bg: #f4f4f5;
    --text: #18181b;
    --text-secondary: #52525b;
    --text-muted: #a1a1aa;
    --border: #e4e4e7;
    --border-strong: #d4d4d8;
    --primary: #4f46e5;          /* indigo-600：沉稳的靛蓝 */
    --primary-hover: #6366f1;    /* indigo-500 */
    --primary-soft: #eef2ff;     /* indigo-50：选中态背景 */
    --primary-text: #ffffff;
    --success: #10b981;          /* emerald-500 */
    --success-soft: #ecfdf5;
    --warning: #f59e0b;          /* amber-500 */
    --warning-soft: #fffbeb;
    --danger: #dc2626;           /* red-600 */
    --danger-soft: #fef2f2;
    --info: #6b7280;
    --info-soft: #f3f4f6;
    --shadow: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
    --kbd-bg: #f4f4f5;
    --kbd-border: #e4e4e7;
    --modal-overlay: rgba(0,0,0,0.5);
}

[data-theme="dark"] {
    /* 暗色：纯黑底 + 略亮的 indigo 作主色，避免刺眼 */
    --bg: #09090b;               /* zinc-950 */
    --card-bg: #18181b;          /* zinc-900 */
    --input-bg: #18181b;
    --hover-bg: #27272a;         /* zinc-800 */
    --text: #fafafa;             /* zinc-50 */
    --text-secondary: #a1a1aa;   /* zinc-400 */
    --text-muted: #71717a;       /* zinc-500 */
    --border: #27272a;           /* zinc-800 */
    --border-strong: #3f3f46;    /* zinc-700 */
    --primary: #818cf8;          /* indigo-400：暗色下用更亮的色阶 */
    --primary-hover: #a5b4fc;    /* indigo-300 */
    --primary-soft: rgba(129, 140, 248, 0.12);
    --primary-text: #09090b;
    --success: #4ade80;          /* green-400 */
    --success-soft: rgba(74, 222, 128, 0.12);
    --warning: #fbbf24;          /* amber-400 */
    --warning-soft: rgba(251, 191, 36, 0.12);
    --danger: #f87171;           /* red-400 */
    --danger-soft: rgba(248, 113, 113, 0.12);
    --info: #a1a1aa;
    --info-soft: rgba(161, 161, 170, 0.12);
    --shadow: 0 1px 3px rgba(0,0,0,0.5);
    --kbd-bg: #27272a;
    --kbd-border: #3f3f46;
    --modal-overlay: rgba(0,0,0,0.7);
}

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

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
    transition: background 0.2s, color 0.2s;
}

#app {
    min-height: 100vh;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 20px 16px;
}

.container {
    width: 100%;
    max-width: 900px;
}

/* 通用按钮 */
button {
    font: inherit;
    cursor: pointer;
    border: none;
    border-radius: 6px;
    padding: 10px 20px;
    background: var(--primary);
    color: var(--primary-text);
    transition: background 0.15s, opacity 0.15s;
}
button:hover { background: var(--primary-hover); }
button:active { background: #4338ca; }  /* indigo-700 */
button:disabled { background: var(--text-muted); cursor: not-allowed; opacity: 0.6; }
button.btn-secondary { background: var(--info); color: var(--primary-text); }
button.btn-secondary:hover { opacity: 0.85; }
button.btn-danger { background: var(--danger); color: #fff; }
button.btn-danger:hover { opacity: 0.85; }
button.btn-text { background: transparent; color: var(--primary); padding: 6px 8px; }
button.btn-text:hover { background: transparent; text-decoration: underline; }
button.btn-ghost { background: transparent; color: var(--text-secondary); border: 1px solid var(--border-strong); }
button.btn-ghost:hover { background: var(--hover-bg); }

/* 输入框 */
input[type="text"], input[type="password"], input[type="file"] {
    font: inherit;
    border: 1px solid var(--border-strong);
    border-radius: 6px;
    padding: 10px 12px;
    outline: none;
    transition: border-color 0.15s;
    background: var(--input-bg);
    color: var(--text);
}
input[type="text"]:focus, input[type="password"]:focus, input[type="file"]:focus {
    border-color: var(--primary);
}

/* 标题 */
h1 { font-size: 24px; margin-bottom: 24px; font-weight: 600; }
h2 { font-size: 20px; margin-bottom: 16px; font-weight: 600; }
h3 { font-size: 16px; margin-bottom: 12px; font-weight: 500; color: var(--text-secondary); }

/* 卡片 */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 16px;
    transition: border-color 0.15s, box-shadow 0.15s;
    box-shadow: var(--shadow);
}
.card:hover { border-color: var(--primary); }
.card .card-title { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.card .card-desc { color: var(--text-secondary); font-size: 14px; line-height: 1.6; }
.card .card-meta { color: var(--text-muted); font-size: 13px; margin-top: 12px; }

.badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: 12px;
    border-radius: 4px;
    margin-left: 8px;
}
.badge-done { background: var(--success); color: #fff; }
.badge-progress { background: var(--warning); color: #fff; }
.badge-new { background: var(--info); color: #fff; }

/* 登录/注册页 */
.auth-page { padding-top: 80px; }
.auth-form { max-width: 360px; margin: 0 auto; }
.auth-form .form-group { margin-bottom: 16px; }
.auth-form label { display: block; margin-bottom: 6px; color: var(--text-secondary); }
.auth-form input { width: 100%; }
.auth-form .actions { margin-top: 24px; display: flex; gap: 12px; }
.auth-form .actions button { flex: 1; }
.auth-form .switch { text-align: center; margin-top: 16px; color: var(--text-secondary); font-size: 14px; }
.auth-form .switch a { color: var(--primary); cursor: pointer; text-decoration: none; }
.auth-form .switch a:hover { text-decoration: underline; }

/* 课程/课时列表 */
.list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}
.list-header .user-info { color: var(--text-secondary); font-size: 14px; }
.list-header .user-info a { color: var(--primary); cursor: pointer; text-decoration: none; margin-left: 12px; }
.list-header .user-info a:hover { text-decoration: underline; }

.lesson-meta { display: flex; gap: 16px; color: var(--text-muted); font-size: 13px; margin-top: 8px; }

/* 训练页 */
.train-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}
.train-header .info { color: var(--text-secondary); font-size: 14px; }
.train-header .info strong { color: var(--text); margin: 0 4px; }
.train-header .progress-text { color: var(--primary); font-weight: 600; }

.train-body {
    padding: 32px 0;
    text-align: center;
}
.cn-text {
    font-size: 22px;
    color: var(--text);
    margin-bottom: 32px;
    min-height: 32px;
    line-height: 1.5;
}
.cn-text .placeholder { color: var(--text-muted); font-style: italic; }

.sentence-area {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 4px;
    justify-content: center;
    align-items: baseline;
    margin: 32px 0;
    font-size: 22px;
    line-height: 2.2;
    color: var(--text);
}
.sentence-token {
    display: inline-block;
}

input.word-input {
    display: inline-block;
    width: 4ch;
    height: 38px;
    text-align: center;
    font-size: 20px;
    border: none !important;
    border-bottom: 2px solid var(--border-strong) !important;
    border-radius: 0 !important;
    background: transparent !important;
    color: var(--text);
    outline: none;
    padding: 0 4px !important;
    transition: width 0.1s, border-color 0.15s, background 0.15s;
    font-family: inherit;
    box-sizing: content-box;
}
input.word-input:focus {
    border-bottom-color: var(--primary) !important;
    background: var(--primary-soft) !important;
    box-shadow: none !important;
}
input.word-input.correct {
    border-bottom-color: var(--success) !important;
    color: var(--success);
    background: var(--success-soft) !important;
    cursor: not-allowed;
    pointer-events: none;
}
input.word-input.error {
    border-bottom-color: var(--danger) !important;
    color: var(--danger);
    background: var(--danger-soft) !important;
}
input.word-input.error:focus {
    background: var(--danger-soft) !important;
}

.train-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 24px;
    flex-wrap: wrap;
}

.feedback {
    margin-top: 16px;
    min-height: 24px;
    font-size: 14px;
}
.feedback.success { color: var(--success); }
.feedback.error { color: var(--danger); }
.feedback.info { color: var(--info); }

.answer-box {
    margin-top: 16px;
    padding: 16px;
    background: var(--info-soft);
    border-radius: 6px;
    text-align: left;
    color: var(--text-secondary);
    line-height: 1.6;
}
.answer-box .answer-en { font-weight: 600; color: var(--text); margin-bottom: 4px; }

/* 句子导航 */
.sentence-nav {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

/* Toast */
.toast {
    position: fixed;
    top: 32px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.78);
    color: #fff;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 14px;
    z-index: 9999;
    pointer-events: none;
    transition: opacity 0.2s;
}
.toast.hidden { opacity: 0; }
.toast.show { opacity: 1; }
.toast.error { background: var(--danger); }
.toast.success { background: var(--success); }

/* 进度条 */
.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    margin-top: 8px;
}
.progress-bar .fill {
    height: 100%;
    background: var(--success);
    transition: width 0.3s;
}

/* 日历卡片（学习记录） */
.calendar-day {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
}
.calendar-day-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    background: var(--hover-bg);
    border-bottom: 1px solid var(--border);
    font-size: 14px;
    color: var(--text-secondary);
}
.calendar-day-header .day-title {
    font-weight: 600;
    color: var(--text);
    font-size: 16px;
}
.calendar-day-header .day-stats {
    display: flex;
    gap: 12px;
    font-size: 13px;
}
.calendar-day-header .day-stats .stat-correct { color: var(--success); }
.calendar-day-header .day-stats .stat-wrong { color: var(--danger); }
.calendar-day-header .day-stats .stat-total { color: var(--text-muted); }

.calendar-day-body {
    padding: 8px 0;
}
.calendar-record {
    display: grid;
    grid-template-columns: 60px 1fr auto;
    gap: 12px;
    align-items: center;
    padding: 10px 20px;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}
.calendar-record:last-child { border-bottom: none; }
.calendar-record .time { color: var(--text-muted); font-size: 13px; }
.calendar-record .content { color: var(--text); }
.calendar-record .content .meta { color: var(--text-muted); font-size: 12px; margin-top: 2px; }
.calendar-record .content .answer { color: var(--text-secondary); margin-top: 2px; font-size: 13px; }
.calendar-record .verdict { font-weight: 600; font-size: 13px; }
.calendar-record .verdict.correct { color: var(--success); }
.calendar-record .verdict.wrong { color: var(--danger); }

/* 记录页 */
.records-list { margin-top: 16px; }
.record-item {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}
.record-item:last-child { border-bottom: none; }
.record-item .record-time { color: var(--text-muted); font-size: 12px; margin-top: 4px; }
.record-item .record-meta { color: var(--text-secondary); }
.record-item .record-answer { color: var(--text); margin-top: 4px; }
.record-item .is-correct-1 { color: var(--success); }
.record-item .is-correct-0 { color: var(--danger); }

/* 数据管理 */
.data-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 16px;
    margin-bottom: 16px;
}

/* 主题切换 */
.theme-toggle {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-strong);
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    margin-left: 12px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.theme-toggle:hover { background: var(--hover-bg); color: var(--text); }

/* 用户菜单（右上角） */
.user-menu {
    position: relative;
    display: inline-block;
}
.user-menu-trigger {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.15s, border-color 0.15s;
}
.user-menu-trigger:hover {
    background: var(--hover-bg);
    border-color: var(--border-strong);
}
.user-menu-trigger .avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--primary-text);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}
.user-menu-trigger .caret { font-size: 10px; color: var(--text-muted); }

.user-menu-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 240px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
    padding: 6px 0;
    z-index: 1000;
}
[data-theme="dark"] .user-menu-dropdown { box-shadow: 0 4px 16px rgba(0,0,0,0.6); }

.user-menu-section {
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
}
.user-menu-section:last-child { border-bottom: none; }

.user-menu-header {
    padding: 8px 14px;
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.user-menu-item {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 8px 14px;
    background: transparent;
    border: none;
    border-radius: 0;
    color: var(--text);
    cursor: pointer;
    font-size: 14px;
    text-align: left;
    transition: background 0.1s;
}
.user-menu-item:hover { background: var(--hover-bg); }
.user-menu-item .icon { width: 16px; text-align: center; opacity: 0.7; }
.user-menu-item .check { margin-left: auto; color: var(--primary); font-weight: 600; }
.user-menu-item.danger { color: var(--danger); }
.user-menu-item.danger:hover { background: var(--danger-soft); }

/* 隐藏 */
.hidden { display: none !important; }
.text-muted { color: var(--text-muted); }

/* 提示行 */
.shortcut-hint {
    text-align: center;
    color: var(--text-muted);
    font-size: 12px;
    margin-top: 16px;
    line-height: 1.8;
}
.shortcut-hint kbd {
    background: var(--kbd-bg);
    border: 1px solid var(--kbd-border);
    border-radius: 3px;
    padding: 1px 6px;
    font-family: monospace;
    font-size: 11px;
    color: var(--text-secondary);
    margin: 0 2px;
}

/* CSV 导入 */
.csv-import {
    background: var(--card-bg);
    border: 1px dashed var(--border-strong);
    border-radius: 8px;
    padding: 20px;
    margin-top: 16px;
    text-align: center;
    color: var(--text-secondary);
}
.csv-import input[type="file"] {
    margin: 12px 0;
    width: 100%;
}
.csv-import .import-result {
    margin-top: 12px;
    font-size: 13px;
}
.csv-import .import-result.success { color: var(--success); }
.csv-import .import-result.error { color: var(--danger); }
.csv-import .template-link {
    color: var(--primary);
    text-decoration: none;
    cursor: pointer;
    font-size: 13px;
}
.csv-import .template-link:hover { text-decoration: underline; }

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--modal-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
}
.modal {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 24px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}
.modal h2 { margin-bottom: 16px; }
.modal pre {
    background: var(--hover-bg);
    padding: 12px;
    border-radius: 6px;
    overflow-x: auto;
    font-size: 12px;
    color: var(--text);
    margin: 12px 0;
}
.modal .actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 16px;
}

/* 弹窗关闭按钮（×） */
.modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    padding: 0;
    background: transparent;
    color: var(--text-muted);
    border: none;
    border-radius: 6px;
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.modal-close:hover {
    background: var(--hover-bg);
    color: var(--text);
}

/* 课时完成弹窗 */
.modal { position: relative; }
.completion-modal {
    text-align: center;
    max-width: 460px;
}
.completion-emoji {
    font-size: 48px;
    margin: 4px 0 8px;
}
.completion-title {
    margin-bottom: 4px;
    font-size: 20px;
}
.completion-lesson {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
}
.completion-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 16px 0 20px;
}
.completion-stats .stat-block {
    background: var(--hover-bg);
    border-radius: 8px;
    padding: 14px 8px;
}
.completion-stats .stat-value {
    font-size: 26px;
    font-weight: 600;
    color: var(--primary);
    line-height: 1.2;
}
.completion-stats .stat-label {
    color: var(--text-secondary);
    font-size: 12px;
    margin-top: 4px;
}
.completion-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 16px;
}
.completion-actions button { min-width: 120px; }
.completion-tip {
    color: var(--text-muted);
    font-size: 12px;
    margin-top: 12px;
}

/* 课程 / 课时的「累计刷完次数」展示 */
.complete-count-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px !important;
    padding: 6px 10px;
    background: var(--primary-soft);
    border-radius: 6px;
    color: var(--primary);
}
.complete-count-row .complete-count-label {
    font-size: 12px;
    color: var(--text-secondary);
}
.complete-count-row .complete-count-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
}

/* ============ 移动端适配 ============ */
@media screen and (max-width: 768px) {
    #app {
        padding: 16px 12px;
    }

    /* 按钮优化 - 更大的触摸区域 */
    button {
        padding: 12px 20px;
        min-height: 44px;
        font-size: 15px;
    }
    button.btn-text {
        padding: 8px 10px;
        min-height: auto;
    }

    /* 输入框优化 */
    input[type="text"],
    input[type="password"],
    input[type="file"] {
        padding: 12px 14px;
        font-size: 16px; /* 防止 iOS 缩放 */
    }

    /* 卡片调整 */
    .card {
        padding: 16px;
        margin-bottom: 12px;
    }

    /* 标题调整 */
    h1 { font-size: 20px; margin-bottom: 16px; }
    h2 { font-size: 18px; margin-bottom: 12px; }

    /* 训练页 */
    .cn-text {
        font-size: 18px;
        margin-bottom: 24px;
    }

    .sentence-area {
        font-size: 18px;
        margin: 24px 0;
    }

    input.word-input {
        width: 5ch;
        height: 36px;
        font-size: 18px;
    }

    .train-header {
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }

    /* 用户菜单优化 */
    .user-menu-trigger {
        padding: 8px 10px;
        font-size: 13px;
    }

    .user-menu-trigger .avatar {
        width: 28px;
        height: 28px;
        font-size: 14px;
    }

    .user-menu-dropdown {
        position: fixed;
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        border-radius: 12px 12px 0 0;
        max-height: 70vh;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* 课程列表头部 */
    .list-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    .list-header .user-info {
        width: 100%;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    /* 弹窗优化 */
    .modal {
        width: 95%;
        max-height: 85vh;
        margin: 20px auto;
        padding: 20px 16px;
    }

    /* 完成弹窗 */
    .completion-stats {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    .completion-stats .stat-block {
        padding: 12px 6px;
    }

    .completion-stats .stat-value {
        font-size: 22px;
    }

    /* Toast 位置调整 */
    .toast {
        top: 20px;
        left: 16px;
        right: 16px;
        transform: none;
        width: auto;
    }

    /* 学习记录 */
    .calendar-record {
        grid-template-columns: 50px 1fr auto;
        gap: 8px;
        padding: 10px 12px;
    }

    /* 快捷键提示隐藏（移动端不需要） */
    .shortcut-hint {
        display: none;
    }

    /* 累计次数行 */
    .complete-count-row {
        flex-direction: column;
        gap: 4px;
        align-items: flex-start;
    }

    /* 课时元信息 */
    .lesson-meta {
        flex-direction: column;
        gap: 4px;
    }
}

/* 极小屏幕优化 */
@media screen and (max-width: 380px) {
    .card {
        padding: 14px;
    }

    h1 { font-size: 18px; }
    h2 { font-size: 16px; }

    .cn-text,
    .sentence-area,
    input.word-input {
        font-size: 16px;
    }

    input.word-input {
        width: 4ch;
        height: 32px;
    }

    .completion-stats .stat-value {
        font-size: 20px;
    }

    .completion-emoji {
        font-size: 40px;
    }
}

/* 横屏模式 */
@media screen and (max-height: 500px) and (orientation: landscape) {
    #app {
        padding: 12px 20px;
    }

    .train-body {
        padding: 16px 0;
    }
}
.lesson-complete-count {
    display: inline-flex;
    gap: 6px;
    align-items: center;
}
.lesson-complete-count .complete-count-label {
    font-size: 12px;
    color: var(--text-secondary);
}
.lesson-complete-count .complete-count-value {
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
}

/* 学习统计 / 个人中心 */
.stats-summary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}
.stats-summary-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 18px 12px;
    text-align: center;
    box-shadow: var(--shadow);
}
.stats-summary-value {
    font-size: 28px;
    font-weight: 600;
    color: var(--primary);
    line-height: 1.2;
}
.stats-summary-label {
    color: var(--text-secondary);
    font-size: 12px;
    margin-top: 6px;
}
.stats-accuracy {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 18px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
    color: var(--text-secondary);
    font-size: 14px;
}
.stats-accuracy .progress-bar { margin-top: 8px; }

.stats-course-card { margin-bottom: 12px; }
.stats-course-meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 8px;
    margin-bottom: 4px;
}
.stat-pill {
    background: var(--hover-bg);
    color: var(--text-secondary);
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 12px;
}
.stat-pill-primary {
    background: var(--primary-soft);
    color: var(--primary);
}
.stats-lesson-list { margin-top: 8px; }
.stats-lesson-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-top: 1px solid var(--border);
    font-size: 13px;
}
.stats-lesson-row:first-child { border-top: none; }
.stats-lesson-name { color: var(--text); }
.stats-lesson-count {
    color: var(--primary);
    font-weight: 600;
}