/**
 * 个人AI进阶课程 - 营销式落地页样式
 * 设计风格：深蓝科技风 + 与基础课程形成视觉区分
 * 方案B：科技蓝主色，体现专业、技术、进阶
 */

/* ============================================
   Hero 轮播背景图（避免内联样式）
   ============================================ */
.pa-hero .hero-slide-bg-1 {
    background-image: url('../images/subherobg/6.jpg');
}
.pa-hero .hero-slide-bg-2 {
    background-image: url('../images/subherobg/2.jpg');
}
.pa-hero .hero-slide-bg-3 {
    background-image: url('../images/subherobg/3.jpg');
}

/* ============================================
   设计变量 - 深蓝科技风（页面级变量，仅此页面使用）
   ============================================ */
.personal-advanced-training,
#faq.pa-faq-section {
    --pa-primary: #0066FF;
    --pa-primary-light: #3399FF;
    --pa-primary-dark: #0052CC;
    --pa-secondary: #00D4FF;
    --pa-accent: #7B68EE;
    --pa-bg: #0A0E27;
    --pa-bg-light: #1A1F3A;
    --pa-bg-card: #151A33;
    --pa-text: #FFFFFF;
    --pa-text-light: #B8C5D6;
    --pa-text-muted: #8E9AB8;
    --pa-shadow: rgba(0, 102, 255, 0.3);
    --pa-glow: rgba(0, 212, 255, 0.4);
    --pa-border: rgba(0, 102, 255, 0.3);
    --pa-radius: 16px;
    --pa-radius-sm: 12px;
    --pa-transition: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   主容器
   ============================================ */
.personal-advanced-training {
    background: linear-gradient(180deg, var(--pa-bg) 0%, var(--pa-bg-light) 100%);
    color: var(--pa-text);
    padding: 80px 0 100px;
    position: relative;
    overflow: hidden;
}

.personal-advanced-training .container {
    position: relative;
    z-index: 1;
}

/* ============================================
   模块2：课程核心价值
   ============================================ */
.pa-section-value {
    margin-bottom: 80px;
}

.pa-section-value .section-header {
    text-align: center;
    margin-bottom: 40px;
}

.pa-section-value .section-header h1 {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 800;
    color: var(--pa-text);
    margin-bottom: 16px;
    line-height: 1.3;
}

.pa-section-value .section-header h1 .highlight {
    background: linear-gradient(135deg, var(--pa-primary) 0%, var(--pa-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pa-section-value .section-header .subtitle {
    font-size: 1.15rem;
    color: var(--pa-text-light);
    max-width: 680px;
    margin: 0 auto 32px;
    line-height: 1.7;
}

.pa-value-outcomes {
    max-width: 760px;
    margin: 0 auto;
    padding: 28px 32px;
    background: rgba(0, 102, 255, 0.1);
    border-radius: var(--pa-radius);
    border-left: 5px solid var(--pa-primary);
    border: 2px solid var(--pa-border);
    box-shadow: 0 4px 24px var(--pa-shadow);
}

.pa-value-outcomes-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 16px;
}

.pa-value-outcomes ul {
    margin: 0;
    padding-left: 24px;
    list-style: none;
}

.pa-value-outcomes li {
    position: relative;
    padding-left: 12px;
    margin-bottom: 10px;
    font-size: 1rem;
    color: var(--pa-text-light);
    line-height: 1.6;
}

.pa-value-outcomes li::before {
    content: '✓';
    position: absolute;
    left: -24px;
    color: var(--pa-secondary);
    font-weight: 700;
}

/* ============================================
   模块3：核心概念扫盲
   ============================================ */
.pa-section-concepts {
    margin-bottom: 80px;
}

.pa-concepts-header {
    text-align: center;
    margin-bottom: 40px;
}

.pa-concepts-header h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 12px;
}

.pa-concepts-header p {
    font-size: 1.05rem;
    color: var(--pa-text-light);
}

.pa-concepts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    max-width: 960px;
    margin: 0 auto;
}

.pa-concept-card {
    position: relative;
    padding: 20px 24px;
    background: var(--pa-bg-card);
    border-radius: var(--pa-radius-sm);
    border: 2px solid var(--pa-border);
    transition: all 0.35s var(--pa-transition);
    cursor: pointer;
    overflow: hidden;
}

.pa-concept-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--pa-primary), var(--pa-secondary));
    opacity: 0;
    transition: opacity 0.35s var(--pa-transition);
}

.pa-concept-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px var(--pa-shadow), 0 0 30px var(--pa-glow);
    border-color: var(--pa-primary);
}

.pa-concept-card:hover::before {
    opacity: 1;
}

.pa-concept-card.active {
    border-color: var(--pa-primary);
    box-shadow: 0 12px 32px var(--pa-shadow);
}

.pa-concept-card.active::before {
    opacity: 1;
}

.pa-concept-term {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--pa-secondary);
    margin-bottom: 8px;
}

.pa-concept-desc {
    font-size: 0.9rem;
    color: var(--pa-text-light);
    line-height: 1.5;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--pa-transition), opacity 0.3s;
}

.pa-concept-card:hover .pa-concept-desc,
.pa-concept-card.active .pa-concept-desc {
    max-height: 80px;
    opacity: 1;
}

/* ============================================
   模块4：AI认知的提升
   ============================================ */
.pa-section-cognition {
    margin-bottom: 80px;
}

.pa-cognition-header {
    text-align: center;
    margin-bottom: 48px;
}

.pa-cognition-header h2 {
    font-size: clamp(1.4rem, 4vw, 1.9rem);
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 16px;
    line-height: 1.4;
}

.pa-cognition-header p {
    font-size: 1.05rem;
    color: var(--pa-text-light);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.7;
}

.pa-cognition-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.pa-cognition-item {
    background: var(--pa-bg-card);
    padding: 28px 24px;
    border-radius: var(--pa-radius-sm);
    text-align: center;
    border: 2px solid var(--pa-border);
    transition: all 0.35s var(--pa-transition);
}

.pa-cognition-item:hover {
    border-color: var(--pa-primary);
    transform: translateY(-6px);
    box-shadow: 0 16px 40px var(--pa-shadow), 0 0 25px var(--pa-glow);
}

.pa-cognition-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: rgba(0, 102, 255, 0.2);
    border: 2px solid var(--pa-border);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.pa-cognition-icon i {
    font-size: 1.4rem;
    background: linear-gradient(135deg, var(--pa-primary), var(--pa-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pa-cognition-item h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 12px;
}

.pa-cognition-item p {
    font-size: 0.9rem;
    color: var(--pa-text-light);
    line-height: 1.6;
    margin: 0;
}

/* ============================================
   模块5：三门核心课程
   ============================================ */
.pa-section-courses {
    margin-bottom: 80px;
}

.pa-section-courses .section-subtitle {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 36px;
    text-align: center;
}

.pa-courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.pa-course-card {
    background: var(--pa-bg-card);
    border-radius: var(--pa-radius);
    overflow: hidden;
    border: 2px solid var(--pa-border);
    transition: all 0.4s var(--pa-transition);
    display: flex;
    flex-direction: column;
}

.pa-course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 48px var(--pa-shadow), 0 0 30px var(--pa-glow);
    border-color: var(--pa-primary);
}

.pa-course-image {
    height: 180px;
    overflow: hidden;
}

.pa-course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s var(--pa-transition);
}

.pa-course-card:hover .pa-course-image img {
    transform: scale(1.08);
}

.pa-course-body {
    padding: 24px;
    flex: 1;
}

.pa-course-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--pa-primary), var(--pa-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    margin-bottom: 16px;
}

.pa-course-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 12px;
    line-height: 1.4;
}

.pa-course-card p {
    font-size: 0.95rem;
    color: var(--pa-text-light);
    line-height: 1.6;
}

/* ============================================
   模块6：10天学习计划（时间轴）
   ============================================ */
.pa-section-outline {
    margin-bottom: 80px;
}

.pa-section-outline .section-subtitle {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 40px;
    text-align: center;
}

.pa-outline-timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.pa-outline-timeline::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--pa-primary) 0%, var(--pa-secondary) 100%);
    border-radius: 2px;
}

.pa-outline-item {
    position: relative;
    padding-left: 72px;
    padding-bottom: 40px;
}

.pa-outline-item:last-child {
    padding-bottom: 0;
}

.pa-outline-dot {
    position: absolute;
    left: 12px;
    top: 4px;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--pa-bg-card);
    border: 4px solid var(--pa-primary);
    box-shadow: 0 0 15px var(--pa-glow);
    z-index: 2;
}

.pa-outline-content {
    background: var(--pa-bg-card);
    padding: 24px 28px;
    border-radius: var(--pa-radius-sm);
    border: 2px solid var(--pa-border);
    border-left: 4px solid var(--pa-primary);
    transition: all 0.35s var(--pa-transition);
}

.pa-outline-content:hover {
    transform: translateX(8px);
    box-shadow: 0 8px 32px var(--pa-shadow);
}

.pa-outline-number {
    font-size: 2rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--pa-primary), var(--pa-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pa-outline-header h4 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--pa-text);
    margin: 8px 0 16px;
}

.pa-outline-content ul {
    margin: 0;
    padding-left: 20px;
    list-style: none;
}

.pa-outline-content li {
    position: relative;
    padding-left: 8px;
    margin-bottom: 8px;
    font-size: 0.95rem;
    color: var(--pa-text-light);
    line-height: 1.5;
}

.pa-outline-content li::before {
    content: '';
    position: absolute;
    left: -16px;
    top: 8px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--pa-secondary);
}

/* ============================================
   模块7：学习收益
   ============================================ */
.pa-section-benefits {
    margin-bottom: 80px;
}

.pa-section-benefits .section-subtitle {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 36px;
    text-align: center;
}

.pa-benefits-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.pa-benefit-item {
    background: var(--pa-bg-card);
    padding: 28px 24px;
    border-radius: var(--pa-radius-sm);
    text-align: center;
    border: 2px solid var(--pa-border);
    transition: all 0.35s var(--pa-transition);
}

.pa-benefit-item:hover {
    border-color: var(--pa-primary);
    transform: translateY(-6px);
    box-shadow: 0 16px 40px var(--pa-shadow), 0 0 25px var(--pa-glow);
}

.pa-benefit-item i {
    font-size: 2.25rem;
    background: linear-gradient(135deg, var(--pa-primary), var(--pa-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    display: block;
}

.pa-benefit-item h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 10px;
}

.pa-benefit-item p {
    font-size: 0.9rem;
    color: var(--pa-text-light);
    line-height: 1.6;
    margin: 0;
}

/* ============================================
   模块8：学习方式
   ============================================ */
.pa-section-methods {
    margin-bottom: 80px;
}

.pa-section-methods .section-subtitle {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 36px;
    text-align: center;
}

.pa-methods-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.pa-method-item {
    display: flex;
    align-items: flex-start;
    background: var(--pa-bg-card);
    padding: 24px;
    border-radius: var(--pa-radius-sm);
    border: 2px solid var(--pa-border);
    border-left: 4px solid var(--pa-primary);
    transition: all 0.35s var(--pa-transition);
}

.pa-method-item:hover {
    border-left-width: 6px;
    transform: translateX(6px);
    box-shadow: 0 8px 28px var(--pa-shadow);
}

.pa-method-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: rgba(0, 102, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 20px;
    flex-shrink: 0;
}

.pa-method-icon i {
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--pa-primary), var(--pa-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pa-method-content h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 8px;
}

.pa-method-content p {
    font-size: 0.95rem;
    color: var(--pa-text-light);
    line-height: 1.6;
    margin: 0;
}

/* ============================================
   模块9：适用人群
   ============================================ */
.pa-section-audience {
    margin-bottom: 80px;
}

.pa-section-audience .section-subtitle {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 36px;
    text-align: center;
}

.pa-audience-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.pa-audience-item {
    background: var(--pa-bg-card);
    padding: 28px 24px;
    border-radius: var(--pa-radius-sm);
    border: 2px solid var(--pa-border);
    border-top: 4px solid var(--pa-primary);
    transition: all 0.35s var(--pa-transition);
}

.pa-audience-item:hover {
    border-top-color: var(--pa-secondary);
    transform: translateY(-6px);
    box-shadow: 0 12px 36px var(--pa-shadow);
}

.pa-audience-item i {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--pa-primary), var(--pa-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    display: block;
}

.pa-audience-item h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 10px;
}

.pa-audience-item p {
    font-size: 0.9rem;
    color: var(--pa-text-light);
    line-height: 1.6;
    margin: 0;
}

/* ============================================
   CTA 按钮
   ============================================ */
.pa-cta-urgent {
    display: inline-block;
    padding: 18px 40px;
    background: linear-gradient(135deg, var(--pa-primary), var(--pa-secondary));
    color: white !important;
    font-weight: 700;
    font-size: 1.1rem;
    text-decoration: none;
    border-radius: 50px;
    box-shadow: 0 12px 32px var(--pa-shadow);
    transition: all 0.35s var(--pa-transition);
    border: 2px solid rgba(0, 212, 255, 0.3);
}

.pa-cta-urgent:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 44px var(--pa-shadow), 0 0 30px var(--pa-glow);
    color: white !important;
}

/* FAQ 区域 - 进阶课程页面，统一深色风格 */
#faq.pa-faq-section {
    background: var(--pa-bg);
    color: var(--pa-text);
    padding: 80px 0 100px;
}

#faq.pa-faq-section .section-header h2 {
    color: var(--pa-text);
}

#faq.pa-faq-section .section-header p {
    color: var(--pa-text-light);
}

#faq.pa-faq-section .section-header h2 .highlight {
    color: var(--pa-secondary);
}

#faq.pa-faq-section .faq-item {
    background: var(--pa-bg-card);
    border-radius: var(--pa-radius-sm);
    margin-bottom: 12px;
    border: 2px solid var(--pa-border);
    overflow: hidden;
}

#faq.pa-faq-section .faq-item:hover {
    border-color: var(--pa-primary);
}

#faq.pa-faq-section .faq-item.active {
    border-color: var(--pa-primary);
    box-shadow: 0 8px 24px var(--pa-shadow);
}

/* 覆盖 main.css 的白色背景，保持与卡片统一的深色 */
#faq.pa-faq-section .faq-question {
    padding: 20px 24px;
    background-color: transparent !important;
    border: none !important;
}

#faq.pa-faq-section .faq-question h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--pa-text);
}

#faq.pa-faq-section .faq-icon {
    color: var(--pa-secondary);
}

#faq.pa-faq-section .faq-icon i {
    color: var(--pa-secondary);
}

#faq.pa-faq-section .faq-answer {
    padding: 0 24px 20px;
    background-color: transparent !important;
}

#faq.pa-faq-section .faq-answer p {
    font-size: 0.95rem;
    color: var(--pa-text-light);
    line-height: 1.7;
}

/* ============================================
   滚动渐入动画
   ============================================ */
.pa-animate-on-scroll {
    opacity: 0;
    transform: translateY(24px);
}

.pa-animate-on-scroll.pa-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 992px) {
    .pa-cognition-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pa-courses-grid {
        grid-template-columns: 1fr;
    }

    .pa-benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pa-methods-grid {
        grid-template-columns: 1fr;
    }

    .pa-audience-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pa-outline-timeline::before {
        left: 16px;
    }

    .pa-outline-item {
        padding-left: 56px;
    }

    .pa-outline-dot {
        left: 4px;
        width: 24px;
        height: 24px;
    }
}

@media (max-width: 768px) {
    .personal-advanced-training {
        padding: 60px 0 80px;
    }

    .pa-section-value,
    .pa-section-concepts,
    .pa-section-cognition,
    .pa-section-courses,
    .pa-section-outline,
    .pa-section-benefits,
    .pa-section-methods,
    .pa-section-audience {
        margin-bottom: 60px;
    }

    .pa-concepts-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pa-cognition-grid {
        grid-template-columns: 1fr;
    }

    .pa-benefits-grid {
        grid-template-columns: 1fr;
    }

    .pa-audience-grid {
        grid-template-columns: 1fr;
    }

    .pa-value-outcomes {
        padding: 20px 24px;
    }
}

@media (max-width: 576px) {
    .pa-concepts-grid {
        grid-template-columns: 1fr;
    }
}