/* ============================================
   组件样式 — 导航栏、卡片、按钮、标签等
   ============================================ */

/* ============================
   导航栏
   ============================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: var(--transition-base);
    backdrop-filter: blur(0px);
}

.navbar.scrolled {
    background: rgba(5, 5, 16, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 800;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.nav-logo .logo-icon {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    object-fit: contain;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    border-radius: 1px;
    transition: var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-cta {
    padding: 10px 24px;
    font-size: var(--text-sm);
    font-weight: 600;
    color: white;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: var(--shadow-glow);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px var(--accent-glow);
}

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-base);
}

/* ============================
   Bento 卡片
   ============================ */
.bento-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    overflow: hidden;
    transition: var(--transition-slow);
}

.bento-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.15), transparent, rgba(6, 182, 212, 0.1));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    transition: var(--transition-slow);
}

.bento-card:hover {
    transform: translateY(-4px);
    background: var(--bg-card-hover);
    border-color: rgba(79, 70, 229, 0.2);
    box-shadow: 0 8px 40px rgba(79, 70, 229, 0.15);
}

.bento-card:hover::before {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.4), transparent, rgba(6, 182, 212, 0.3));
}

.bento-card .card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: var(--space-lg);
}

.bento-card .card-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.bento-card .card-description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 卡片颜色变体 */
.bento-card.card-blue .card-icon {
    background: rgba(79, 70, 229, 0.15);
    color: var(--accent-primary);
}

.bento-card.card-cyan .card-icon {
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent-secondary);
}

.bento-card.card-amber .card-icon {
    background: rgba(245, 158, 11, 0.15);
    color: var(--color-amber);
}

.bento-card.card-emerald .card-icon {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-emerald);
}

.bento-card.card-rose .card-icon {
    background: rgba(244, 63, 94, 0.15);
    color: var(--color-rose);
}

.bento-card.card-violet .card-icon {
    background: rgba(139, 92, 246, 0.15);
    color: var(--color-violet);
}

/* ============================
   按钮
   ============================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 14px 32px;
    font-size: var(--text-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    color: white;
    background: var(--accent-gradient);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 50px var(--accent-glow);
}

.btn-secondary {
    color: var(--text-primary);
    background: var(--bg-glass);
    border: 1px solid var(--border-card);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: var(--bg-glass-hover);
    border-color: rgba(79, 70, 229, 0.3);
    transform: translateY(-2px);
}

.btn-sm {
    padding: 8px 20px;
    font-size: var(--text-sm);
}

/* ============================
   标签
   ============================ */
.tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.tag-glow {
    background: rgba(79, 70, 229, 0.12);
    color: var(--accent-primary);
    border: 1px solid rgba(79, 70, 229, 0.2);
    box-shadow: 0 0 12px rgba(79, 70, 229, 0.1);
}

.tag-cyan {
    background: rgba(6, 182, 212, 0.12);
    color: var(--accent-secondary);
    border: 1px solid rgba(6, 182, 212, 0.2);
}

.tag-amber {
    background: rgba(245, 158, 11, 0.12);
    color: var(--color-amber);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.tag-emerald {
    background: rgba(16, 185, 129, 0.12);
    color: var(--color-emerald);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

/* ============================
   统计数字
   ============================ */
.stat-item {
    text-align: center;
}

.stat-number {
    font-family: var(--font-display);
    font-size: var(--text-4xl);
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

/* ============================
   时间线
   ============================ */
.timeline {
    position: relative;
    padding-left: var(--space-3xl);
}

/* 隐藏原来的静态竖线，改用 SVG 路径 */
.timeline::before {
    display: none;
}

/* SVG 路径容器：左侧对齐圆点中心 */
.timeline-svg {
    position: absolute;
    left: 0;
    top: 0;
    width: 12px;
    height: 100%;
    pointer-events: none;
    overflow: visible;
}

/* 底层轨道：暗色、虚幻感 */
.timeline-track {
    fill: none;
    stroke: rgba(79, 70, 229, 0.12);
    stroke-width: 2;
    stroke-linecap: round;
}

/* 上层绘制路径：渐变 + 发光 */
.timeline-draw {
    fill: none;
    stroke: url(#timeline-gradient);
    stroke-width: 2.5;
    stroke-linecap: round;
    /* 初始状态完全隐藏，JS 控制绘制 */
    stroke-dasharray: 0;
    stroke-dashoffset: 0;
    transition: none;
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-3xl);
}

/* 节点圆点，默认暗淡，中心对齐 SVG 路径 x=6 */
.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--space-3xl));
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(79, 70, 229, 0.3);
    border: 2px solid var(--bg-primary);
    transition: all 0.5s ease;
}

/* 滚动到达时，节点亮起 */
.timeline-item.node-active::before {
    background: var(--accent-primary);
    box-shadow: 0 0 16px var(--accent-glow), 0 0 30px rgba(79, 70, 229, 0.3);
    transform: scale(1.2);
}

.timeline-date {
    font-size: var(--text-sm);
    color: var(--accent-secondary);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.timeline-title {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.timeline-role {
    font-size: var(--text-base);
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.timeline-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

/* ============================
   项目卡片（大卡片）
   ============================ */
.project-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: var(--transition-slow);
    cursor: pointer;
}

.project-card:hover {
    transform: translateY(-6px);
    border-color: rgba(79, 70, 229, 0.3);
    box-shadow: 0 12px 48px rgba(79, 70, 229, 0.2);
}

.project-card .project-visual {
    position: relative;
    height: 170px;
    overflow: hidden;
}

.project-card .project-visual::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent 40%, var(--bg-card) 100%);
}

.project-card .project-body {
    padding: var(--space-xl) var(--space-2xl) var(--space-2xl);
}

.project-card .project-category {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--accent-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
}

.project-card .project-title {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.project-card .project-desc {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.project-card .project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.project-card .project-metrics {
    display: flex;
    gap: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-subtle);
    margin-top: var(--space-lg);
}

.project-card .metric {
    display: flex;
    flex-direction: column;
}

.project-card .metric-value {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: var(--text-xl);
    color: var(--accent-primary);
}

.project-card .metric-label {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

/* ============================
   技能雷达容器
   ============================ */
.radar-chart {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
    margin: 0 auto;
}

/* ============================
   联系模块
   ============================ */
.contact-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    backdrop-filter: blur(20px);
    text-align: center;
    transition: var(--transition-base);
}

.contact-card:hover {
    border-color: rgba(79, 70, 229, 0.3);
    background: var(--bg-glass-hover);
}

.contact-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    background: rgba(79, 70, 229, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin: 0 auto var(--space-lg);
    color: var(--accent-primary);
}

/* ============================
   移动端响应
   ============================ */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: rgba(5, 5, 16, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: var(--space-xl);
        gap: var(--space-lg);
        border-bottom: 1px solid var(--border-subtle);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .stat-number {
        font-size: var(--text-3xl);
    }

    .timeline {
        padding-left: var(--space-2xl);
    }

    .project-card .project-visual {
        height: 160px;
    }
}

/* ============================
   返回顶部按钮
   ============================ */
.back-to-top {
    position: fixed;
    bottom: 80px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--border-glow);
    background: rgba(15, 15, 36, 0.8);
    backdrop-filter: blur(12px);
    cursor: pointer;
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity 0.35s ease, transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), visibility 0.35s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
    transform: translateY(-3px);
}

.back-to-top:active {
    transform: translateY(0) scale(0.92);
}

/* 箭头图标 */
.back-to-top svg {
    width: 20px;
    height: 20px;
    stroke: var(--accent-secondary);
    stroke-width: 2.5;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: stroke 0.3s ease;
}

.back-to-top:hover svg {
    stroke: var(--accent-primary);
}

/* 底部进度环 */
.back-to-top .progress-ring {
    position: absolute;
    inset: 0;
    width: 48px;
    height: 48px;
    transform: rotate(-90deg);
    pointer-events: none;
}

.back-to-top .progress-ring circle {
    fill: none;
    stroke: var(--accent-primary);
    stroke-width: 2;
    stroke-dasharray: 138;
    stroke-dashoffset: 138;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.15s ease;
}

@media (max-width: 768px) {
    .back-to-top {
        bottom: 68px;
        right: 20px;
        width: 42px;
        height: 42px;
    }

    .back-to-top .progress-ring {
        width: 42px;
        height: 42px;
    }

    .back-to-top .progress-ring circle {
        stroke-dasharray: 120;
        stroke-dashoffset: 120;
    }
}