/**
 * 蓝思.星 - 主样式表
 * @version 2.0
 * 设计理念：现代、简洁、专业，适合个人品牌展示
 */

/* ===== CSS Variables ===== */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary: #7c3aed;
    --accent: #f59e0b;
    --text: #1e293b;
    --text-light: #64748b;
    --text-muted: #94a3b8;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-dark: #0f172a;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

img, video {
    max-width: 100%;
    height: auto;
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: all var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text);
}

.brand-icon {
    font-size: 1.5rem;
}

.navbar-menu {
    display: flex;
    gap: 0.3rem;
}

.navbar-menu a {
    padding: 0.5rem 0.9rem;
    border-radius: var(--radius-sm);
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
}

.navbar-menu a:hover,
.navbar-menu a.active {
    color: var(--primary);
    background: var(--primary-light);
}

.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.navbar-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6rem 1.5rem 4rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #7c3aed 100%);
    z-index: 0;
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    position: relative;
    z-index: 1;
    color: #fff;
}

.hero-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.25);
    border-radius: 50px;
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(4px);
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    opacity: 0.9;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.hero-desc {
    font-size: 1rem;
    opacity: 0.7;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.5);
    font-size: 0.8rem;
    text-align: center;
    z-index: 1;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid rgba(255,255,255,0.5);
    border-bottom: 2px solid rgba(255,255,255,0.5);
    transform: rotate(45deg);
    margin: 0.5rem auto 0;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: rotate(45deg) translateY(0); }
    40% { transform: rotate(45deg) translateY(-8px); }
    60% { transform: rotate(45deg) translateY(-4px); }
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,0.5);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: #fff;
    color: #fff;
}

.btn-ghost {
    background: rgba(255,255,255,0.1);
    color: #fff;
    border-color: transparent;
}

.btn-ghost:hover {
    background: rgba(255,255,255,0.2);
    color: #fff;
}

.btn-sm {
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
}

/* ===== Sections ===== */
.section {
    padding: 5rem 0;
}

.section-alt {
    background: var(--bg-alt);
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-tag {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.section-desc {
    color: var(--text-light);
    font-size: 1.05rem;
}

/* ===== About / Resume ===== */
.about-summary {
    margin-bottom: 3rem;
}

.summary-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    margin-bottom: 2rem;
}

.summary-card .summary-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.summary-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.summary-card p {
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.8;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem 1rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 0.3rem;
}

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

/* ===== Timeline ===== */
.timeline {
    margin-bottom: 3rem;
}

.timeline-title,
.skills-title,
.edu-title {
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border);
}

.timeline-item {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 2rem;
    border-left: 2px solid var(--border);
}

.timeline-dot {
    position: absolute;
    left: -7px;
    top: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid var(--bg);
    box-shadow: 0 0 0 2px var(--primary);
}

.timeline-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.timeline-header h4 {
    font-size: 1.1rem;
    color: var(--text);
}

.timeline-tag {
    padding: 0.2rem 0.6rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.timeline-tag.current {
    background: #dcfce7;
    color: #166534;
}

.timeline-position {
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.2rem;
}

.timeline-period {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.timeline-details {
    list-style: none;
    padding: 0;
}

.timeline-details li {
    position: relative;
    padding-left: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

.timeline-details li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

.timeline-achievements {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--border);
}

.timeline-achievements h5 {
    font-size: 0.9rem;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.timeline-achievements ul {
    list-style: none;
}

.timeline-achievements li {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 0.3rem;
}

/* ===== Skills Grid ===== */
.skills-section {
    margin-bottom: 3rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.2rem;
}

.skill-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: all var(--transition);
}

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

.skill-icon {
    font-size: 2rem;
    margin-bottom: 0.8rem;
}

.skill-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.skill-card p {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ===== Education ===== */
.edu-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.edu-info h4 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.edu-info p {
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.edu-courses {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ===== Videos ===== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.video-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all var(--transition);
}

.video-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.video-wrapper {
    position: relative;
    padding-top: 56.25%;
    background: #000;
}

.video-wrapper video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-info {
    padding: 1rem 1.2rem;
}

.video-info h4 {
    font-size: 1rem;
    margin-bottom: 0.3rem;
}

.video-info p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ===== Jobs ===== */
.job-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.job-card.featured {
    border-color: var(--primary);
    box-shadow: 0 0 0 1px var(--primary);
}

.job-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(135deg, var(--primary-light), #f0e6ff);
}

.job-header h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.job-meta {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    align-items: center;
}

.job-salary {
    background: var(--primary);
    color: #fff;
    padding: 0.2rem 0.8rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
}

.job-type {
    background: #dcfce7;
    color: #166534;
    padding: 0.2rem 0.6rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
}

.job-location {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.job-body {
    padding: 2rem;
}

.job-section {
    margin-bottom: 1.5rem;
}

.job-section h4 {
    font-size: 1rem;
    margin-bottom: 0.8rem;
    color: var(--text);
}

.job-section ul {
    list-style: disc;
    padding-left: 1.5rem;
}

.job-section li {
    color: var(--text-light);
    margin-bottom: 0.3rem;
    font-size: 0.9rem;
}

.job-section p {
    color: var(--text-light);
    font-size: 0.9rem;
}

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

.benefit-item {
    display: flex;
    gap: 0.8rem;
    align-items: flex-start;
    padding: 0.8rem;
    background: var(--bg-alt);
    border-radius: var(--radius-sm);
}

.benefit-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.benefit-item strong {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 0.2rem;
}

.benefit-item p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0;
}

.job-footer {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border);
    background: var(--bg-alt);
    text-align: center;
}

.job-footer p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

.job-footer code {
    background: var(--primary-light);
    color: var(--primary);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.85rem;
}

/* ===== Messages / Guestbook ===== */
.messages-layout,
.guestbook-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 2rem;
    align-items: start;
}

.message-form-card,
.message-list-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.message-form-card h3,
.message-list-card h3 {
    font-size: 1.1rem;
    margin-bottom: 1.2rem;
}

.msg-count {
    color: var(--text-muted);
    font-weight: normal;
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.4rem;
    color: var(--text);
}

.form-group label small {
    font-weight: normal;
    color: var(--text-muted);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.7rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: var(--font);
    transition: border-color var(--transition);
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.char-count {
    text-align: right;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

.message-list {
    margin-bottom: 1.5rem;
}

.message-item {
    display: flex;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
}

.message-item:last-child {
    border-bottom: none;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.message-body {
    flex: 1;
    min-width: 0;
}

.message-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.3rem;
}

.message-meta strong {
    font-size: 0.9rem;
}

.message-meta time {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.message-text {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.6;
    word-break: break-word;
}

.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

/* ===== Pagination ===== */
.pagination {
    display: flex;
    gap: 0.3rem;
    justify-content: center;
    margin-top: 1.5rem;
}

.page-link {
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--text-light);
    transition: all var(--transition);
}

.page-link:hover,
.page-link.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ===== Alerts ===== */
.alert {
    padding: 0.8rem 1.2rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.alert-success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* ===== Modal ===== */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 9999;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg);
    border-radius: var(--radius-lg);
    padding: 2rem;
    max-width: 400px;
    width: 90%;
    box-shadow: var(--shadow-lg);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    line-height: 1;
}

.modal-content h3 {
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.contact-info-list {
    margin-bottom: 1.5rem;
}

.contact-row {
    display: flex;
    justify-content: space-between;
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--border);
}

.contact-row:last-child {
    border-bottom: none;
}

.contact-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.contact-value {
    font-weight: 600;
    color: var(--text);
}

.contact-tip {
    background: var(--bg-alt);
    padding: 0.8rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--text-light);
    text-align: center;
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-dark);
    color: rgba(255,255,255,0.7);
    padding: 3rem 0 1.5rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    margin-bottom: 1rem;
}

.footer-slogan {
    font-size: 0.9rem;
    opacity: 0.7;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.85rem;
    opacity: 0.5;
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    box-shadow: var(--shadow);
    z-index: 99;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .navbar-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow);
    }

    .navbar-menu.active {
        display: flex;
    }

    .navbar-toggle {
        display: flex;
    }

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

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .video-grid {
        grid-template-columns: 1fr;
    }

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

    .messages-layout,
    .guestbook-layout {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

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

    .job-header, .job-body, .job-footer {
        padding: 1.2rem;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 3rem 0;
    }

    .container {
        padding: 0 1rem;
    }
}

/* ===== Fade-in Animation ===== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger children */
.skills-grid .skill-card:nth-child(2) { transition-delay: 0.1s; }
.skills-grid .skill-card:nth-child(3) { transition-delay: 0.2s; }
.skills-grid .skill-card:nth-child(4) { transition-delay: 0.3s; }
.skills-grid .skill-card:nth-child(5) { transition-delay: 0.4s; }
.skills-grid .skill-card:nth-child(6) { transition-delay: 0.5s; }

.stats-row .stat-item:nth-child(2) { transition-delay: 0.1s; }
.stats-row .stat-item:nth-child(3) { transition-delay: 0.2s; }
.stats-row .stat-item:nth-child(4) { transition-delay: 0.3s; }

.video-grid .video-card:nth-child(2) { transition-delay: 0.15s; }
.video-grid .video-card:nth-child(3) { transition-delay: 0.3s; }
.video-grid .video-card:nth-child(4) { transition-delay: 0.45s; }