/* ==================== 全局初始化 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --text-dark: #2d3748;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --bg-white: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==================== 导航栏 ==================== */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.search-container {
    position: relative;
}

.search-input {
    padding: 8px 12px 8px 40px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 0.875rem;
    width: 200px;
    transition: var(--transition);
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.search-input:focus {
    outline: none;
    border-color: white;
    background: rgba(255, 255, 255, 0.2);
    width: 250px;
}

.search-btn {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
}

.search-btn:hover {
    color: white;
}

.logo {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: white;
    background: rgba(255, 255, 255, 0.2);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    border-radius: 3px;
    transition: var(--transition);
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

.btn-small {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-full {
    width: 100%;
}

/* ==================== 英雄区域 ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
    position: relative;
    overflow: hidden;
    padding-top: 70px;
}

.hero-content {
    text-align: center;
    color: white;
    z-index: 2;
    padding: 20px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.95;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.4s both;
}

.hero-decoration {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    animation: float 6s ease-in-out infinite;
}

.circle-1 {
    width: 300px;
    height: 300px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.circle-2 {
    width: 200px;
    height: 200px;
    top: 60%;
    right: 10%;
    animation-delay: 2s;
}

.circle-3 {
    width: 150px;
    height: 150px;
    bottom: 20%;
    left: 30%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== 通用区块样式 ==================== */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: var(--text-dark);
}

/* ==================== 学习路线图 ==================== */
.roadmap {
    padding: 100px 0;
    background: var(--bg-white);
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.timeline-item {
    display: flex;
    justify-content: flex-end;
    padding-right: 50%;
    position: relative;
    margin-bottom: 50px;
}

.timeline-item:nth-child(even) {
    justify-content: flex-start;
    padding-right: 0;
    padding-left: 50%;
}

.timeline-marker {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-light);
    padding: 25px;
    border-radius: var(--radius-lg);
    max-width: 350px;
    box-shadow: var(--shadow);
    margin: 0 30px;
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.status {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-top: 10px;
}

.status.completed {
    background: #c6f6d5;
    color: #22543d;
}

.status.in-progress {
    background: #feebc8;
    color: #744210;
}

.status.pending {
    background: #e2e8f0;
    color: #4a5568;
}

/* ==================== 每日一句 ==================== */
.quote-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea15, #764ba215);
}

.quote-card {
    max-width: 700px;
    margin: 0 auto;
    background: var(--bg-white);
    padding: 50px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.quote-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
}

.quote-card blockquote {
    font-size: 1.5rem;
    font-style: italic;
    color: var(--text-dark);
    margin-bottom: 20px;
    line-height: 1.8;
}

.quote-card cite {
    display: block;
    color: var(--text-light);
    margin-bottom: 25px;
}

/* ==================== 学习统计 ==================== */
.stats {
    padding: 100px 0;
    background: var(--bg-white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    margin-bottom: 20px;
    color: var(--accent-color);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 10px;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
}

/* ==================== 页面头部 ==================== */
.page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 150px 0 80px;
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 15px;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* ==================== 关于页面 ==================== */
.about-section {
    padding: 80px 0;
    background: var(--bg-white);
}

.about-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 60px;
    align-items: center;
}

.avatar-placeholder {
    width: 250px;
    height: 250px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
    box-shadow: var(--shadow-lg);
}

.about-content h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.about-content p {
    margin-bottom: 20px;
    color: var(--text-light);
    line-height: 1.8;
}

.about-info {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.info-item {
    display: flex;
    gap: 15px;
}

.info-label {
    font-weight: 600;
    color: var(--primary-color);
    min-width: 100px;
}

.info-value {
    color: var(--text-light);
}

/* ==================== 技能部分 ==================== */
.skills-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.skill-card {
    background: var(--bg-white);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.skill-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.skill-card h3 {
    margin-bottom: 15px;
    color: var(--text-dark);
}

.skill-bar {
    height: 10px;
    background: #e2e8f0;
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 10px;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 5px;
    transition: width 1s ease;
}

.skill-percent {
    font-weight: 600;
    color: var(--primary-color);
}

.skill-card p {
    margin-top: 15px;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ==================== 工具部分 ==================== */
.tools-section {
    padding: 80px 0;
    background: var(--bg-white);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
}

.tool-item {
    background: var(--bg-light);
    padding: 25px;
    border-radius: var(--radius);
    text-align: center;
    transition: var(--transition);
}

.tool-item:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    transform: translateY(-3px);
}

.tool-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 10px;
}

.tool-name {
    display: block;
    font-weight: 600;
    margin-bottom: 5px;
}

.tool-desc {
    font-size: 0.85rem;
    opacity: 0.8;
}

/* ==================== 学习历程 ==================== */
.journey-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.journey-timeline {
    max-width: 800px;
    margin: 0 auto;
}

.journey-item {
    display: flex;
    gap: 30px;
    margin-bottom: 40px;
    position: relative;
    padding-left: 30px;
    border-left: 3px solid var(--primary-color);
}

.journey-item.current {
    border-left-color: var(--accent-color);
}

.journey-date {
    min-width: 120px;
    font-weight: 600;
    color: var(--primary-color);
}

.journey-item.current .journey-date {
    color: var(--accent-color);
}

.journey-content h4 {
    margin-bottom: 8px;
    color: var(--text-dark);
}

.journey-content p {
    color: var(--text-light);
}

/* ==================== 笔记页面 ==================== */
.notes-categories {
    padding: 30px 0;
    background: var(--bg-white);
    border-bottom: 1px solid #e2e8f0;
    position: sticky;
    top: 70px;
    z-index: 100;
}

.category-tabs {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 10px 24px;
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.tab-btn:hover,
.tab-btn.active {
    background: var(--primary-color);
    color: white;
}

.notes-section {
    padding: 60px 0;
    background: var(--bg-light);
    min-height: 60vh;
}

.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.note-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.note-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.note-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.note-tag {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.note-tag.html {
    background: #feebc8;
    color: #744210;
}

.note-tag.css {
    background: #c6f6d5;
    color: #22543d;
}

.note-tag.js {
    background: #bee3f8;
    color: #2a4365;
}

.note-tag.tips {
    background: #e9d8fd;
    color: #553c9a;
}

.note-date {
    color: var(--text-light);
    font-size: 0.875rem;
}

.note-card h3 {
    margin-bottom: 15px;
    color: var(--text-dark);
}

.note-preview {
    color: var(--text-light);
    margin-bottom: 20px;
}

.note-content {
    margin-bottom: 20px;
}

.note-content.hidden {
    display: none;
}

.note-content h4 {
    margin: 20px 0 10px;
    color: var(--text-dark);
}

.note-content ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.note-content li {
    margin-bottom: 8px;
    color: var(--text-light);
}

.code-example {
    background: #2d3748;
    border-radius: var(--radius);
    padding: 20px;
    margin: 15px 0;
    overflow-x: auto;
}

.code-example code {
    color: #e2e8f0;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

.tip-box {
    background: #c6f6d5;
    border-left: 4px solid #48bb78;
    padding: 15px;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin: 15px 0;
}

.floating-action {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 100;
}

.fab {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.fab:hover {
    transform: scale(1.1) rotate(90deg);
}

/* ==================== 联系页面 ==================== */
.contact-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 50px;
}

.contact-info-card,
.contact-form-card {
    background: var(--bg-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.contact-info-card h2,
.contact-form-card h2 {
    margin-bottom: 20px;
    color: var(--text-dark);
}

.contact-info-card > p {
    color: var(--text-light);
    margin-bottom: 30px;
}

.contact-methods {
    margin-bottom: 40px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 25px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.contact-detail h4 {
    margin-bottom: 5px;
    color: var(--text-dark);
}

.contact-detail a,
.contact-detail span {
    color: var(--text-light);
    text-decoration: none;
}

.contact-detail a:hover {
    color: var(--primary-color);
}

.social-links h4 {
    margin-bottom: 15px;
    color: var(--text-dark);
}

.social-icons {
    display: flex;
    gap: 15px;
}

.social-icon {
    width: 45px;
    height: 45px;
    background: var(--bg-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    text-decoration: none;
    transition: var(--transition);
}

.social-icon:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    transform: translateY(-3px);
}

/* 表单样式 */
.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

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

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.checkbox-group {
    display: flex;
    align-items: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.checkbox-label input {
    width: auto;
}

.form-success {
    text-align: center;
    padding: 40px;
}

.form-success.hidden {
    display: none;
}

.success-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.form-success h3 {
    margin-bottom: 10px;
    color: var(--text-dark);
}

.form-success p {
    color: var(--text-light);
    margin-bottom: 25px;
}

/* FAQ 部分 */
.faq-section {
    padding: 80px 0;
    background: var(--bg-white);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 15px;
    border: 1px solid #e2e8f0;
    border-radius: var(--radius);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 20px 25px;
    background: var(--bg-light);
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-dark);
    transition: var(--transition);
}

.faq-question:hover {
    background: #edf2f7;
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 25px;
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item.active .faq-answer {
    padding: 20px 25px;
    max-height: 500px;
}

.faq-answer p {
    color: var(--text-light);
    line-height: 1.8;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .about-image {
        display: flex;
        justify-content: center;
    }

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: 20px 0;
        gap: 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        display: block;
        padding: 15px;
    }

    .hamburger {
        display: flex;
    }
    
    .search-container {
        display: none;
    }

    .hero h1 {
        font-size: 2rem;
    }

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

    .section-title {
        font-size: 1.75rem;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item,
    .timeline-item:nth-child(even) {
        padding-left: 60px;
        padding-right: 0;
        justify-content: flex-start;
    }

    .timeline-marker {
        left: 20px;
        transform: translateX(-50%);
    }

    .timeline-content {
        margin: 0;
        max-width: 100%;
    }

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

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

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

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        width: 100%;
        padding: 0 20px;
    }

    .btn {
        width: 100%;
    }

    .quote-card {
        padding: 30px 20px;
    }

    .quote-card blockquote {
        font-size: 1.1rem;
    }

    .stat-card {
        padding: 30px 20px;
    }

    .stat-number {
        font-size: 2rem;
    }

    .avatar-placeholder {
        width: 180px;
        height: 180px;
        font-size: 4rem;
    }

    .contact-info-card,
    .contact-form-card {
        padding: 25px;
    }
}

/* ==================== 动画效果 ==================== */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-pulse {
    animation: pulse 2s infinite;
}

/* 滚动显示动画 */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 100px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99;
    opacity: 0;
    visibility: hidden;
}

.back-to-top:hover {
    transform: translateY(-5px);
}

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