/**
 * 个人AI基础培训 - 营销式落地页样式
 * 设计风格：现代活力 + 暖橙主色 + 概念标签云
 * 遵循 frontend-design 原则：独特字体、层次感、动效、非对称布局
 */

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

/* ============================================
   设计变量
   ============================================ */
:root {
    --basic-primary: #FF6B35;
    --basic-primary-light: #FF8C5A;
    --basic-primary-dark: #E55A2B;
    --basic-secondary: #FFB84D;
    --basic-accent: #FFD93D;
    --basic-bg: #FFF8F0;
    --basic-bg-light: #FFFBF5;
    --basic-bg-dark: #FFF3E8;
    --basic-text: #2C2C2C;
    --basic-text-light: #666666;
    --basic-text-muted: #8E8E8E;
    --basic-card: #FFFFFF;
    --basic-shadow: rgba(255, 107, 53, 0.15);
    --basic-shadow-strong: rgba(255, 107, 53, 0.25);
    --basic-border: rgba(255, 107, 53, 0.2);
    --basic-radius: 20px;
    --basic-radius-sm: 12px;
    --basic-transition: cubic-bezier(0.4, 0, 0.2, 1);
}

/* 字体：使用系统字体栈，确保中文可读性 */
.personal-basic-training,
.personal-basic-training * {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
}

/* ============================================
   主容器
   ============================================ */
.personal-basic-training {
    background: linear-gradient(180deg, var(--basic-bg) 0%, var(--basic-bg-light) 50%, var(--basic-bg-dark) 100%);
    background-attachment: fixed;
    padding: 80px 0 100px;
    position: relative;
    overflow: hidden;
}

/* 背景装饰： subtle grain */
.personal-basic-training::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
}

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

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

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

.pb-section-value .section-header h1 {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 800;
    color: var(--basic-text);
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

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

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

.pb-value-outcomes {
    max-width: 760px;
    margin: 0 auto;
    padding: 28px 32px;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.08) 0%, rgba(255, 184, 77, 0.08) 100%);
    border-radius: var(--basic-radius);
    border-left: 5px solid var(--basic-primary);
    box-shadow: 0 4px 24px var(--basic-shadow);
}

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

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

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

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

/* ============================================
   模块3：核心概念扫盲（概念标签云）
   ============================================ */
.pb-section-concepts {
    margin-bottom: 80px;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

/* ============================================
   模块3.5：AI认知的提升
   ============================================ */
.pb-section-cognition {
    margin-bottom: 80px;
}

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

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

.pb-cognition-header h2 .highlight {
    color: var(--basic-primary);
}

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

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

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

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

.pb-cognition-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.12), rgba(255, 184, 77, 0.12));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

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

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

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

/* ============================================
   模块4：三门核心课程
   ============================================ */
.pb-section-courses {
    margin-bottom: 80px;
}

.pb-section-courses .section-subtitle {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--basic-text);
    margin-bottom: 36px;
    text-align: center;
    position: relative;
    padding-left: 0;
}

.pb-section-courses .section-subtitle::before {
    display: none;
}

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

.pb-course-card {
    background: var(--basic-card);
    border-radius: var(--basic-radius);
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
    transition: all 0.4s var(--basic-transition);
    display: flex;
    flex-direction: column;
    border: 2px solid transparent;
}

.pb-course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 48px var(--basic-shadow);
    border-color: var(--basic-border);
}

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

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

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

.pb-course-body {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

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

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

.pb-course-card p {
    font-size: 0.95rem;
    color: var(--basic-text-light);
    line-height: 1.6;
    flex: 1;
}

/* ============================================
   模块5：7天学习计划（时间轴）
   ============================================ */
.pb-section-outline {
    margin-bottom: 80px;
}

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

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

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

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

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

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

.pb-outline-content {
    background: var(--basic-card);
    padding: 24px 28px;
    border-radius: var(--basic-radius-sm);
    border-left: 4px solid var(--basic-primary);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transition: all 0.35s var(--basic-transition);
}

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

.pb-outline-number {
    font-size: 2rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--basic-primary), var(--basic-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

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

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

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

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

/* ============================================
   模块6：学习收益
   ============================================ */
.pb-section-benefits {
    margin-bottom: 80px;
}

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

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

.pb-benefit-item {
    background: linear-gradient(135deg, var(--basic-card) 0%, var(--basic-bg-light) 100%);
    padding: 28px 24px;
    border-radius: var(--basic-radius-sm);
    border: 2px solid rgba(255, 107, 53, 0.1);
    text-align: center;
    transition: all 0.35s var(--basic-transition);
}

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

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

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

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

/* ============================================
   模块7：学习方式
   ============================================ */
.pb-section-methods {
    margin-bottom: 80px;
}

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

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

.pb-method-item {
    display: flex;
    align-items: flex-start;
    background: var(--basic-card);
    padding: 24px;
    border-radius: var(--basic-radius-sm);
    border-left: 4px solid var(--basic-primary);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.35s var(--basic-transition);
}

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

.pb-method-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.12), rgba(255, 184, 77, 0.12));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 20px;
    flex-shrink: 0;
}

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

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

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

/* ============================================
   模块8：适用人群
   ============================================ */
.pb-section-audience {
    margin-bottom: 80px;
}

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

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

.pb-audience-item {
    background: var(--basic-card);
    padding: 28px 24px;
    border-radius: var(--basic-radius-sm);
    border-top: 4px solid var(--basic-primary);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.35s var(--basic-transition);
}

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

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

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

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

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

.pb-cta-urgent:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 44px var(--basic-shadow-strong);
    color: white !important;
}

/* Hero 内 CTA */
.hero-simple .pb-cta-urgent {
    margin-top: 24px;
}

/* ============================================
   FAQ 区域样式增强（个人基础课程专用）
   ============================================ */
#faq.pb-faq-section .section-header h2 .highlight {
    color: var(--basic-primary);
}

#faq.pb-faq-section .faq-item {
    background: var(--basic-card);
    border-radius: var(--basic-radius-sm);
    margin-bottom: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    overflow: hidden;
    border: 2px solid transparent;
    transition: all 0.3s var(--basic-transition);
}

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

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

#faq.pb-faq-section .faq-question {
    padding: 20px 24px;
}

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

#faq.pb-faq-section .faq-answer {
    padding: 0 24px 20px;
}

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

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

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

/*  staggered 延迟 */
.pb-animate-on-scroll[data-delay="1"] { transition-delay: 0.1s; }
.pb-animate-on-scroll[data-delay="2"] { transition-delay: 0.2s; }
.pb-animate-on-scroll[data-delay="3"] { transition-delay: 0.3s; }
.pb-animate-on-scroll[data-delay="4"] { transition-delay: 0.4s; }
.pb-animate-on-scroll[data-delay="5"] { transition-delay: 0.5s; }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    .pb-concept-card {
        padding: 16px 20px;
    }
}

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