/* ===== 全局变量 ===== */
:root {
    --wx-green: #07C160;
    --wx-green-dark: #06AD56;
    --wx-green-light: #E8F8EE;
    --wx-green-lighter: #F0FBF4;
    --wx-black: #1A1A1A;
    --wx-text: #353535;
    --wx-text-secondary: #888888;
    --wx-bg: #FFFFFF;
    --wx-bg-gray: #F7F7F7;
    --wx-border: #ECECEC;
    --wx-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    --wx-shadow-hover: 0 12px 40px rgba(7, 193, 96, 0.15);
    --radius: 16px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--wx-text);
    background: var(--wx-bg);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* ===== 导航栏 ===== */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

#navbar.scrolled {
    border-bottom-color: var(--wx-border);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
    color: var(--wx-black);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--wx-green);
    color: #fff;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 900;
    transition: var(--transition);
}

.nav-logo:hover .logo-icon {
    transform: scale(1.08) rotate(-5deg);
    background: var(--wx-green-dark);
}

.nav-links {
    display: flex;
    gap: 36px;
}

.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: var(--wx-text);
    position: relative;
    transition: var(--transition);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--wx-green);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--wx-green);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--wx-black);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero ===== */
#hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(160deg, var(--wx-green-lighter) 0%, #FFFFFF 60%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-circle {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
}

.hero-circle-1 {
    width: 500px;
    height: 500px;
    background: var(--wx-green);
    top: -100px;
    right: -100px;
    opacity: 0.12;
    animation: float 8s ease-in-out infinite;
}

.hero-circle-2 {
    width: 400px;
    height: 400px;
    background: var(--wx-green);
    bottom: -50px;
    left: -80px;
    opacity: 0.08;
    animation: float 10s ease-in-out infinite reverse;
}

.hero-circle-3 {
    width: 300px;
    height: 300px;
    background: #4facfe;
    top: 40%;
    left: 50%;
    opacity: 0.05;
    animation: float 12s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.05); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 0 24px;
    max-width: 720px;
}

.hero-eyebrow {
    display: inline-block;
    padding: 6px 18px;
    background: var(--wx-green-light);
    color: var(--wx-green-dark);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
    animation: fadeUp 0.8s ease;
}

.hero-title {
    font-size: clamp(48px, 8vw, 80px);
    font-weight: 900;
    color: var(--wx-black);
    letter-spacing: -2px;
    line-height: 1.1;
    margin-bottom: 20px;
    animation: fadeUp 0.8s ease 0.1s both;
}

.hero-subtitle {
    font-size: clamp(16px, 2.5vw, 20px);
    color: var(--wx-text-secondary);
    margin-bottom: 40px;
    animation: fadeUp 0.8s ease 0.2s both;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 60px;
    animation: fadeUp 0.8s ease 0.3s both;
}

.btn {
    padding: 14px 36px;
    border-radius: 100px;
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    display: inline-block;
}

.btn-primary {
    background: var(--wx-green);
    color: #fff;
    box-shadow: 0 8px 24px rgba(7, 193, 96, 0.3);
}

.btn-primary:hover {
    background: var(--wx-green-dark);
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(7, 193, 96, 0.4);
}

.btn-ghost {
    background: transparent;
    color: var(--wx-text);
    border: 2px solid var(--wx-border);
}

.btn-ghost:hover {
    border-color: var(--wx-green);
    color: var(--wx-green);
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    animation: fadeUp 0.8s ease 0.4s both;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-num {
    font-size: 32px;
    font-weight: 900;
    color: var(--wx-black);
}

.stat-label {
    font-size: 14px;
    color: var(--wx-text-secondary);
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 36px;
    background: var(--wx-border);
}

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

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    width: 26px;
    height: 42px;
    border: 2px solid var(--wx-border);
    border-radius: 14px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.scroll-indicator span {
    width: 4px;
    height: 8px;
    background: var(--wx-green);
    border-radius: 2px;
    animation: scrollDown 1.8s ease infinite;
}

@keyframes scrollDown {
    0% { opacity: 0; transform: translateY(-4px); }
    50% { opacity: 1; }
    100% { opacity: 0; transform: translateY(12px); }
}

/* ===== 通用 Section Header ===== */
.section-header {
    text-align: center;
    padding: 100px 24px 50px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--wx-green);
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(32px, 5vw, 44px);
    font-weight: 900;
    color: var(--wx-black);
    letter-spacing: -1px;
}

.section-desc {
    font-size: 16px;
    color: var(--wx-text-secondary);
    margin-top: 12px;
}

/* ===== 文章列表 ===== */
#articles {
    background: var(--wx-bg);
}

.articles-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px 100px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 28px;
}

.article-card {
    background: var(--wx-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--wx-shadow);
    transition: var(--transition);
    border: 1px solid var(--wx-border);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--wx-shadow-hover);
    border-color: var(--wx-green-light);
}

.card-cover {
    height: 200px;
    position: relative;
    display: flex;
    align-items: flex-start;
    padding: 20px;
    overflow: hidden;
}

.cover-img {
    background-color: #F7F7F7;
    height: auto !important;
    min-height: 180px;
    padding: 0 !important;
    overflow: visible !important;
    align-items: center;
    justify-content: center;
    display: block;
}

.cover-img img {
    width: 100%;
    height: auto;
    display: block;
}

.cover-1 { background: linear-gradient(135deg, #07C160, #06AD56); }
.cover-2 { background: linear-gradient(135deg, #1A1A1A, #2E2E2E); }
.cover-3 { background: linear-gradient(135deg, #07C160, #00B4D8); }
.cover-4 { background: linear-gradient(135deg, #06AD56, #07C160); }
.cover-5 { background: linear-gradient(135deg, #2E2E2E, #07C160); }
.cover-6 { background: linear-gradient(135deg, #07C160, #1A1A1A); }

.article-card:hover .card-cover {
    transform: scale(1.02);
}

.card-cover::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
}

.card-cover::after {
    content: '';
    position: absolute;
    bottom: -40%;
    left: -20%;
    width: 150px;
    height: 150px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 50%;
}

.card-cat-inline {
    font-size: 12px;
    color: var(--wx-green);
    font-weight: 500;
}

.card-cat {
    position: relative;
    z-index: 1;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: #fff;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
}

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

.card-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--wx-text-secondary);
    margin-bottom: 12px;
}

.meta-dot {
    color: var(--wx-border);
}

.card-title {
    font-size: 19px;
    font-weight: 700;
    color: var(--wx-black);
    line-height: 1.4;
    margin-bottom: 12px;
    transition: var(--transition);
}

.article-card:hover .card-title {
    color: var(--wx-green);
}

.card-excerpt {
    font-size: 14px;
    color: var(--wx-text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    padding: 4px 10px;
    background: var(--wx-bg-gray);
    color: var(--wx-text-secondary);
    border-radius: 6px;
    font-size: 12px;
    transition: var(--transition);
}

.article-card:hover .tag {
    background: var(--wx-green-light);
    color: var(--wx-green-dark);
}

.card-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--wx-green);
    white-space: nowrap;
    transition: var(--transition);
}

.card-link:hover {
    gap: 4px;
    letter-spacing: 0.5px;
}

/* ===== 关于 ===== */
#about {
    background: var(--wx-bg-gray);
    padding: 100px 24px;
}

.about-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-left .section-tag {
    margin-bottom: 12px;
}

.about-left .section-title {
    margin-bottom: 24px;
}

.about-desc {
    font-size: 16px;
    color: var(--wx-text);
    line-height: 1.9;
    margin-bottom: 16px;
}

.about-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 28px;
}

.skill-tag {
    padding: 8px 18px;
    background: var(--wx-bg);
    border: 1px solid var(--wx-border);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    color: var(--wx-text);
    transition: var(--transition);
}

.skill-tag:hover {
    background: var(--wx-green);
    color: #fff;
    border-color: var(--wx-green);
    transform: translateY(-2px);
}

.about-right {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.about-card {
    background: var(--wx-bg);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    border: 1px solid var(--wx-border);
    transition: var(--transition);
}

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

.about-card-icon {
    font-size: 36px;
    margin-bottom: 14px;
}

.about-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--wx-black);
    margin-bottom: 8px;
}

.about-card p {
    font-size: 14px;
    color: var(--wx-text-secondary);
}

/* ===== 联系 ===== */
#contact {
    padding: 100px 24px;
    background: var(--wx-bg);
}

.contact-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    background: linear-gradient(135deg, var(--wx-green) 0%, var(--wx-green-dark) 100%);
    border-radius: 28px;
    padding: 70px 40px;
    overflow: hidden;
}

.contact-bg-circle {
    position: absolute;
    top: -60px;
    right: -60px;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.contact-container .section-tag {
    color: rgba(255, 255, 255, 0.8);
}

.contact-title {
    color: #fff;
    margin-bottom: 14px;
}

.contact-desc {
    color: rgba(255, 255, 255, 0.85);
    font-size: 16px;
    margin-bottom: 36px;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 24px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 100px;
    color: #fff;
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-3px);
}

.contact-icon {
    font-size: 20px;
}

/* ===== 页脚 ===== */
footer {
    background: var(--wx-black);
    padding: 50px 24px;
    text-align: center;
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.footer-brand .logo-icon {
    width: 32px;
    height: 32px;
    font-size: 16px;
}

.footer-text {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
    margin-bottom: 16px;
}

.footer-copy {
    color: rgba(255, 255, 255, 0.3);
    font-size: 13px;
}

.footer-icp {
    margin-top: 8px;
}

.footer-icp a {
    color: rgba(255, 255, 255, 0.3);
    font-size: 13px;
    transition: color var(--transition);
}

.footer-icp a:hover {
    color: rgba(255, 255, 255, 0.6);
}

/* ===== 返回顶部 ===== */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--wx-green);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 24px rgba(7, 193, 96, 0.3);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}

#backToTop.visible {
    opacity: 1;
    visibility: visible;
}

#backToTop:hover {
    background: var(--wx-green-dark);
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(7, 193, 96, 0.4);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--wx-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-stats {
        gap: 20px;
    }

    .stat-num {
        font-size: 26px;
    }

    .about-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-right {
        grid-template-columns: 1fr 1fr;
    }

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

    .contact-links {
        flex-direction: column;
        align-items: center;
    }

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

    .btn {
        width: 200px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .about-right {
        grid-template-columns: 1fr;
    }

    .hero-stats {
        flex-direction: row;
        gap: 16px;
    }

    .stat-divider {
        height: 24px;
    }
}