/* ============================================
   编程学习路线图 - roadmap.css
   零基础编程学习路线图页面专用样式
   特性: 垂直时间线、阶段卡片、渐变徽章、知识标签
   依赖: main.css 中的 CSS 变量
   ============================================ */

/* ============================================
   路线图 Hero 区域
   ============================================ */
.roadmap-hero {
    position: relative;
    padding: var(--space-3xl) 0 var(--space-2xl);
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    text-align: center;
}

.roadmap-hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -15%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    animation: roadmap-float 7s ease-in-out infinite;
    pointer-events: none;
}

.roadmap-hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(236, 72, 153, 0.12) 0%, transparent 70%);
    animation: roadmap-float 9s ease-in-out infinite reverse;
    pointer-events: none;
}

@keyframes roadmap-float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.1); }
}

.roadmap-hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.roadmap-hero-icon {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: 2rem;
    margin: 0 auto var(--space-lg);
    box-shadow: var(--shadow-glow);
    animation: roadmap-pulse 2.5s ease-in-out infinite;
}

@keyframes roadmap-pulse {
    0%, 100% { transform: scale(1); box-shadow: 0 0 20px rgba(99, 102, 241, 0.3); }
    50% { transform: scale(1.05); box-shadow: 0 0 35px rgba(99, 102, 241, 0.55); }
}

.roadmap-hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--space-md);
    line-height: 1.2;
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: roadmap-gradient-shift 4s ease infinite;
}

@keyframes roadmap-gradient-shift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.roadmap-hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-xl);
}

.roadmap-hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    justify-content: center;
    margin-top: var(--space-xl);
}

.roadmap-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: var(--space-md) var(--space-xl);
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    min-width: 120px;
    transition: all var(--transition-normal);
}

.roadmap-stat:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.roadmap-stat-number {
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.roadmap-stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ============================================
   路线图概览说明
   ============================================ */
.roadmap-overview {
    padding: var(--space-2xl) 0;
    background: var(--bg-primary);
}

.roadmap-overview-card {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-xl);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-xl);
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1rem;
}

.roadmap-overview-card strong {
    color: var(--text-primary);
}

.roadmap-overview-card .overview-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--primary);
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: var(--space-sm);
}

/* ============================================
   时间线主体
   ============================================ */
.roadmap-section {
    padding: var(--space-2xl) 0 var(--space-3xl);
    background: var(--bg-primary);
}

.roadmap-section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
    padding: 0 var(--container-padding);
}

.roadmap-section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.roadmap-section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* 时间线容器 */
.roadmap-timeline {
    position: relative;
    max-width: 1100px;
    margin: 0 auto;
    padding: var(--space-xl) var(--container-padding);
}

/* 桌面端：中央竖线 */
.roadmap-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 4px;
    background: linear-gradient(180deg,
        var(--primary) 0%,
        var(--secondary) 50%,
        var(--accent) 100%);
    transform: translateX(-50%);
    border-radius: 2px;
    box-shadow: 0 0 12px rgba(99, 102, 241, 0.25);
}

/* ============================================
   阶段卡片容器
   ============================================ */
.stage-wrapper {
    position: relative;
    width: 50%;
    padding: var(--space-lg) var(--space-2xl);
    margin-bottom: var(--space-xl);
}

.stage-wrapper:nth-child(odd) {
    left: 0;
}

.stage-wrapper:nth-child(even) {
    left: 50%;
}

/* ============================================
   阶段编号徽章 (时间线上的圆点)
   ============================================ */
.stage-badge {
    position: absolute;
    top: var(--space-xl);
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: 1.4rem;
    font-weight: 800;
    z-index: 2;
    box-shadow: 0 0 0 6px var(--bg-primary), var(--shadow-md);
    transition: all var(--transition-bounce);
}

.stage-wrapper:nth-child(odd) .stage-badge {
    right: -28px;
}

.stage-wrapper:nth-child(even) .stage-badge {
    left: -28px;
}

.stage-badge:hover {
    transform: scale(1.15) rotate(10deg);
    box-shadow: 0 0 0 6px var(--bg-primary), var(--shadow-glow);
}

/* ============================================
   阶段卡片本体
   ============================================ */
.stage-card {
    position: relative;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    overflow: hidden;
}

/* 卡片顶部渐变条 */
.stage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.stage-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.stage-card:hover::before {
    opacity: 1;
}

/* 卡片头部 */
.stage-card-header {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.stage-card-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
}

.stage-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-sm);
}

.stage-duration {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.8rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
}

.stage-tech {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.8rem;
    background: rgba(236, 72, 153, 0.1);
    color: var(--secondary);
    border: 1px solid rgba(236, 72, 153, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
}

/* 卡片描述 */
.stage-description {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-md);
    font-size: 0.98rem;
}

/* 知识点区块 */
.stage-points {
    margin-bottom: var(--space-md);
}

.stage-points-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.stage-points-label i {
    color: var(--primary);
}

.stage-points-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    list-style: none;
    padding: 0;
    margin: 0;
}

/* 知识点标签 (pills) */
.knowledge-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.35rem 0.85rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.82rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: default;
    text-decoration: none;
}

.knowledge-pill::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary);
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.knowledge-pill:hover {
    background: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.knowledge-pill:hover::before {
    background: var(--text-inverse);
}

/* 偶数阶段标签配色微调 */
.stage-wrapper:nth-child(even) .knowledge-pill::before {
    background: var(--secondary);
}

.stage-wrapper:nth-child(even) .knowledge-pill:hover {
    background: var(--secondary);
    border-color: var(--secondary);
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
}

/* 推荐教程按钮 */
.stage-tutorial {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.6rem 1.2rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--text-inverse);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-normal);
    box-shadow: 0 3px 10px rgba(99, 102, 241, 0.3);
}

.stage-tutorial:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(99, 102, 241, 0.45);
}

.stage-tutorial i {
    transition: transform var(--transition-fast);
}

.stage-tutorial:hover i {
    transform: translateX(4px);
}

.stage-wrapper:nth-child(even) .stage-tutorial {
    background: linear-gradient(135deg, var(--secondary), #db2777);
    box-shadow: 0 3px 10px rgba(236, 72, 153, 0.3);
}

.stage-wrapper:nth-child(even) .stage-tutorial:hover {
    box-shadow: 0 6px 18px rgba(236, 72, 153, 0.45);
}

/* 卡片箭头指向时间线 (桌面端装饰) */
.stage-card::after {
    content: '';
    position: absolute;
    top: var(--space-xl);
    width: 0;
    height: 0;
    border-style: solid;
}

.stage-wrapper:nth-child(odd) .stage-card::after {
    right: -12px;
    border-width: 10px 0 10px 12px;
    border-color: transparent transparent transparent var(--border-color);
}

.stage-wrapper:nth-child(even) .stage-card::after {
    left: -12px;
    border-width: 10px 12px 10px 0;
    border-color: transparent var(--border-color) transparent transparent;
}

/* ============================================
   底部 CTA 区域
   ============================================ */
.roadmap-cta {
    padding: var(--space-2xl) 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.06), rgba(6, 182, 212, 0.06));
}

.roadmap-cta-card {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    padding: var(--space-2xl) var(--space-xl);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.roadmap-cta-card h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.roadmap-cta-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.roadmap-cta-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   暗色主题适配
   ============================================ */
[data-theme="dark"] .roadmap-hero {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

[data-theme="dark"] .roadmap-stat {
    background: rgba(30, 41, 59, 0.7);
}

[data-theme="dark"] .roadmap-overview-card {
    background: var(--bg-secondary);
}

[data-theme="dark"] .stage-badge {
    box-shadow: 0 0 0 6px var(--bg-primary), 0 4px 12px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .knowledge-pill {
    background: var(--bg-secondary);
}

[data-theme="dark"] .roadmap-timeline::before {
    box-shadow: 0 0 12px rgba(129, 140, 248, 0.3);
}

/* ============================================
   data-animate 支持 (基于 opacity)
   ============================================ */
[data-animate].stage-wrapper {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].stage-wrapper.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* 交错动画延迟 */
.stage-wrapper:nth-child(1) { transition-delay: 0.05s; }
.stage-wrapper:nth-child(2) { transition-delay: 0.15s; }
.stage-wrapper:nth-child(3) { transition-delay: 0.25s; }
.stage-wrapper:nth-child(4) { transition-delay: 0.35s; }
.stage-wrapper:nth-child(5) { transition-delay: 0.45s; }

/* ============================================
   响应式：移动端单列布局 (时间线靠左)
   ============================================ */
@media (max-width: 768px) {
    .roadmap-hero {
        padding: var(--space-2xl) 0 var(--space-xl);
    }

    .roadmap-hero-title {
        font-size: 2rem;
    }

    .roadmap-hero-subtitle {
        font-size: 1rem;
    }

    .roadmap-hero-icon {
        width: 60px;
        height: 60px;
        font-size: 1.6rem;
    }

    .roadmap-hero-stats {
        gap: var(--space-sm);
    }

    .roadmap-stat {
        min-width: 100px;
        padding: var(--space-sm) var(--space-md);
    }

    .roadmap-stat-number {
        font-size: 1.4rem;
    }

    .roadmap-section-header h2 {
        font-size: 1.5rem;
    }

    .roadmap-section-header p {
        font-size: 0.95rem;
    }

    /* 移动端：时间线靠左 */
    .roadmap-timeline {
        padding: var(--space-lg) var(--container-padding);
        padding-left: 2.5rem;
    }

    .roadmap-timeline::before {
        left: 12px;
        transform: translateX(0);
        width: 3px;
    }

    /* 所有阶段卡片靠左对齐 */
    .stage-wrapper {
        width: 100%;
        left: 0 !important;
        padding: var(--space-md) 0 var(--space-md) var(--space-lg);
    }

    /* 徽章统一放左侧 */
    .stage-wrapper:nth-child(odd) .stage-badge,
    .stage-wrapper:nth-child(even) .stage-badge {
        left: -22px;
        right: auto;
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
        top: var(--space-md);
    }

    /* 移动端隐藏指向时间线的箭头 */
    .stage-card::after {
        display: none;
    }

    .stage-card {
        padding: var(--space-md);
    }

    .stage-card-title {
        font-size: 1.15rem;
    }

    .stage-meta {
        gap: 0.4rem;
    }

    .stage-duration,
    .stage-tech {
        font-size: 0.78rem;
        padding: 0.25rem 0.65rem;
    }

    .knowledge-pill {
        font-size: 0.78rem;
        padding: 0.3rem 0.7rem;
    }

    .stage-tutorial {
        width: 100%;
        justify-content: center;
        padding: 0.7rem 1.2rem;
    }

    /* 移动端奇偶配色统一为主色 */
    .stage-wrapper:nth-child(even) .knowledge-pill::before {
        background: var(--primary);
    }

    .stage-wrapper:nth-child(even) .knowledge-pill:hover {
        background: var(--primary);
        border-color: var(--primary);
        box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    }

    .stage-wrapper:nth-child(even) .stage-tutorial {
        background: linear-gradient(135deg, var(--primary), var(--primary-dark));
        box-shadow: 0 3px 10px rgba(99, 102, 241, 0.3);
    }

    .roadmap-cta-card {
        padding: var(--space-xl) var(--space-md);
    }

    .roadmap-cta-buttons {
        flex-direction: column;
    }

    .roadmap-cta-buttons .btn {
        width: 100%;
        justify-content: center;
    }
}

/* 超小屏幕 */
@media (max-width: 480px) {
    .roadmap-hero-title {
        font-size: 1.7rem;
    }

    .roadmap-hero-stats {
        flex-direction: column;
        align-items: center;
    }

    .roadmap-stat {
        width: 100%;
        max-width: 240px;
    }
}

/* ============================================
   减少动画偏好
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    .roadmap-hero::before,
    .roadmap-hero::after,
    .roadmap-hero-icon,
    .roadmap-hero-title {
        animation: none !important;
    }

    [data-animate].stage-wrapper {
        opacity: 1 !important;
        transform: none !important;
        transition: none !important;
    }

    .stage-card,
    .stage-badge,
    .knowledge-pill,
    .stage-tutorial,
    .roadmap-stat {
        transition: none !important;
    }

    .stage-card:hover,
    .stage-badge:hover,
    .knowledge-pill:hover,
    .stage-tutorial:hover,
    .roadmap-stat:hover {
        transform: none !important;
    }
}