/**
 * PsyLearn 全局主题变量
 * 背诵岛 / 学习平台统一设计系统
 *
 * 品牌色：粉色是火苗，不是整页空气。
 */

:root {
    /* ========== 页面空气 ========== */
    --pl-bg-page: #f7f7f5;
    --pl-bg-soft: #f3f4f6;
    --pl-card-bg: #ffffff;

    /* ========== 文字 ========== */
    --pl-text-main: #17172f;
    --pl-text-secondary: #374151;
    --pl-text-muted: #6b7280;
    --pl-text-light: #9ca3af;

    /* ========== 品牌粉 ==========
     * Logo / 主按钮 / 当前状态 / 标签 / 少量 icon / CTA */
    --pl-brand-pink: #ff5f8f;
    --pl-brand-pink-2: #ec6bd9;
    --pl-brand-pink-soft: #fff0f5;

    /* ========== 学习完成绿 ==========
     * 已完成 / 正确 / 可继续 / 成功提示 */
    --pl-brand-green: #16c784;
    --pl-brand-green-soft: #e9fff5;

    /* ========== 记忆胶布黄 ==========
     * Round2 遮盖关键词 / 记忆提示区 */
    --pl-tape-yellow: #fff1b8;
    --pl-tape-yellow-strong: #ffe08a;
    --pl-tape-text: #7a4b00;

    /* ========== 边框阴影 ========== */
    --pl-border: #e8e8e6;
    --pl-shadow-card: 0 12px 32px rgba(15, 23, 42, 0.08);
    --pl-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --pl-shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
}

/* ========== 快捷工具类 ========== */

/* 页面背景 */
.pl-page-bg {
    background: var(--pl-bg-page);
    min-height: 100vh;
}

/* 品牌粉渐变（按钮 / 标签 / 当前状态） */
.pl-brand-gradient {
    background: linear-gradient(135deg, var(--pl-brand-pink-2), var(--pl-brand-pink));
    color: white;
}

/* 完成绿渐变 */
.pl-green-gradient {
    background: linear-gradient(135deg, var(--pl-brand-green), #12a86d);
    color: white;
}

/* 胶布黄渐变 */
.pl-tape-gradient {
    background: linear-gradient(135deg, var(--pl-tape-yellow), var(--pl-tape-yellow-strong));
}

/* ============================================
   科目章节列表页 - 卡片样式系统 (v1.8.3)
   设计原则：品牌色是点缀，不是铺满；标题优先
   ============================================ */

.pl-subject-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 20px;
}

.pl-chapter-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 32px;
}

@media (min-width: 1100px) {
    .pl-chapter-grid { gap: 20px; }
}

.pl-chapter-card {
    background: white;
    border-radius: 14px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    border: 1px solid var(--pl-border);
}

.pl-chapter-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.1);
    border-color: rgba(255, 95, 143, 0.2);
}

.pl-chapter-card-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
}

.pl-chapter-card-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
    background: var(--pl-brand-pink-soft);
    color: var(--pl-brand-pink);
}

.pl-chapter-card-body {
    flex: 1;
    min-width: 0;
}

.pl-chapter-card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--pl-text-main);
    margin-bottom: 4px;
    line-height: 1.4;
}

.pl-chapter-card-count {
    font-size: 12px;
    color: var(--pl-text-light);
}

.pl-chapter-card-stats {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
    font-size: 12px;
    color: var(--pl-text-muted);
}

.pl-chapter-stat-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.pl-chapter-stat-value {
    font-weight: 600;
    color: var(--pl-text-secondary);
}

.pl-chapter-stat-dot {
    color: var(--pl-border);
}

.pl-chapter-card-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--pl-brand-pink-soft);
    color: var(--pl-brand-pink);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    border: 1px solid rgba(255, 95, 143, 0.15);
    cursor: pointer;
    width: 100%;
    margin-top: auto;
}

.pl-chapter-card-btn:hover {
    background: linear-gradient(135deg, var(--pl-brand-pink-2), var(--pl-brand-pink));
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 12px rgba(255, 95, 143, 0.25);
}

.pl-chapter-card-btn i {
    font-size: 11px;
    transition: transform 0.2s ease;
}

.pl-chapter-card:hover .pl-chapter-card-btn i {
    transform: translateX(2px);
}

.pl-chapter-card-btn--primary {
    background: linear-gradient(135deg, var(--pl-brand-pink-2), var(--pl-brand-pink));
    color: white;
    box-shadow: 0 2px 8px rgba(255, 95, 143, 0.25);
}

.pl-chapter-card-btn--primary:hover {
    background: linear-gradient(135deg, var(--pl-brand-pink-2), var(--pl-brand-pink));
    color: white;
    box-shadow: 0 4px 12px rgba(255, 95, 143, 0.35);
}

.pl-chapter-card--locked {
    opacity: 0.5;
    cursor: default;
    pointer-events: none;
}

.pl-chapter-card--locked .pl-chapter-card-icon {
    background: var(--pl-bg-soft);
    color: var(--pl-text-light);
}

.pl-chapter-card--locked .pl-chapter-card-btn {
    background: var(--pl-bg-soft);
    color: var(--pl-text-light);
    cursor: not-allowed;
}

@media (max-width: 640px) {
    .pl-subject-container {
        padding: 20px 12px;
    }

    .pl-chapter-grid {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .pl-chapter-card {
        border-radius: 0;
        padding: 14px 16px;
        box-shadow: none;
        border: none;
        border-bottom: 1px solid #f2f2f2;
        flex-direction: row;
        align-items: center;
    }

    .pl-chapter-card:first-of-type {
        border-top: 1px solid #f2f2f2;
    }

    .pl-chapter-card:hover {
        transform: none;
        box-shadow: none;
        background: #fdf6f9;
        border-color: transparent;
    }

    .pl-chapter-card-header {
        flex: 1;
        margin-bottom: 0;
        gap: 12px;
        align-items: center;
    }

    .pl-chapter-card-icon {
        width: 36px;
        height: 36px;
        border-radius: 8px;
        font-size: 15px;
    }

    .pl-chapter-card-title {
        font-size: 15px;
        font-weight: 600;
        margin-bottom: 2px;
    }

    .pl-chapter-card-count {
        font-size: 12px;
    }

    .pl-chapter-card-stats,
    .pl-chapter-card-btn {
        display: none;
    }

    .pl-chapter-card-arrow {
        display: flex;
        align-items: center;
        color: #ccc;
        font-size: 14px;
        margin-left: 8px;
    }
}

.pl-chapter-card-arrow {
    display: none;
}