/* ========================================
   享软互联 - 共享软件官网定制样式
   宠物 ins 风：浅蓝 + 奶白 + 浅黄
   藤蔓式延伸布局
======================================== */

/* CSS Reset & 基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-light-blue: #E8F4F8;
    --color-cream-white: #FFF9F0;
    --color-light-yellow: #FFF4D6;
    --color-accent-blue: #5A9BD4;
    --color-accent-yellow: #FFD97D;
    --color-text-dark: #2C3E50;
    --color-text-gray: #7F8C8D;
    --color-white: #FFFFFF;
    --shadow-soft: 0 4px 20px rgba(90, 155, 212, 0.15);
    --shadow-hover: 0 8px 30px rgba(90, 155, 212, 0.25);
    --border-radius-large: 20px;
    --border-radius-medium: 15px;
    --border-radius-small: 10px;
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--color-light-blue) 0%, var(--color-cream-white) 50%, var(--color-light-yellow) 100%);
    color: var(--color-text-dark);
    line-height: 1.8;
    min-height: 100vh;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

/* ========================================
   顶部导航栏 - 藤蔓式曲线设计
======================================== */
.header-vine {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 249, 240, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(90, 155, 212, 0.1);
    transition: var(--transition-smooth);
}

.header-vine.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 30px rgba(90, 155, 212, 0.2);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-vine {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--color-accent-blue);
}

.logo-vine img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-accent-yellow);
}

.nav-menu {
    display: flex;
    gap: 0.5rem;
}

.nav-item {
    position: relative;
}

.nav-link {
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius-medium);
    color: var(--color-text-dark);
    font-weight: 500;
    transition: var(--transition-smooth);
    display: block;
}

.nav-link:hover,
.nav-link.active {
    background: linear-gradient(135deg, var(--color-light-blue), var(--color-accent-blue));
    color: var(--color-white);
    transform: translateY(-2px);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--color-accent-yellow);
    border-radius: 3px;
    transform: translateX(-50%);
    transition: var(--transition-smooth);
}

.nav-link:hover::after {
    width: 80%;
}

/* 移动端汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

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

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

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ========================================
   主容器 - 藤蔓式布局
======================================== */
.main-vine-container {
    max-width: 1400px;
    margin: 100px auto 0;
    padding: 2rem;
    position: relative;
}

.vine-branch {
    position: relative;
    padding-left: 3rem;
    margin-bottom: 4rem;
}

.vine-branch::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--color-accent-blue), var(--color-accent-yellow));
    border-radius: 4px;
}

.vine-node {
    position: relative;
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--color-white);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.vine-node::before {
    content: '';
    position: absolute;
    left: -3.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    background: var(--color-accent-blue);
    border-radius: 50%;
    border: 4px solid var(--color-accent-yellow);
}

.vine-node:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-hover);
}

/* ========================================
   Hero Banner - 全屏渐变
======================================== */
.hero-section {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-light-blue) 0%, var(--color-cream-white) 50%, var(--color-light-yellow) 100%);
    border-radius: var(--border-radius-large);
    margin-bottom: 4rem;
}

.hero-content {
    text-align: center;
    z-index: 2;
    padding: 3rem;
}

.hero-title {
    font-size: 4rem;
    font-weight: bold;
    color: var(--color-accent-blue);
    margin-bottom: 1.5rem;
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text-gray);
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease-out 0.3s both;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    animation: fadeInUp 1s ease-out 0.6s both;
}

.btn-primary,
.btn-secondary {
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent-blue), #4A8BC4);
    color: var(--color-white);
    box-shadow: 0 4px 15px rgba(90, 155, 212, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(90, 155, 212, 0.4);
}

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

.btn-secondary:hover {
    background: var(--color-accent-blue);
    color: var(--color-white);
    transform: translateY(-3px);
}

/* ========================================
   卡片式设计
======================================== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.feature-card {
    background: var(--color-white);
    border-radius: var(--border-radius-large);
    padding: 2rem;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-light-blue), var(--color-accent-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
}

.feature-card h3 {
    color: var(--color-accent-blue);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.feature-card p {
    color: var(--color-text-gray);
    line-height: 1.6;
}

/* ========================================
   产品/服务展示
======================================== */
.product-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
    margin: 3rem 0;
}

.product-card {
    background: var(--color-white);
    border-radius: var(--border-radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.product-card:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-hover);
}

.product-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.product-info {
    padding: 2rem;
}

.product-info h3 {
    color: var(--color-accent-blue);
    margin-bottom: 0.8rem;
    font-size: 1.4rem;
}

.product-info p {
    color: var(--color-text-gray);
    margin-bottom: 1.5rem;
}

.product-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.tag {
    padding: 0.4rem 1rem;
    background: var(--color-light-blue);
    color: var(--color-accent-blue);
    border-radius: 20px;
    font-size: 0.85rem;
}

/* ========================================
   资讯列表
======================================== */
.news-section {
    background: var(--color-white);
    border-radius: var(--border-radius-large);
    padding: 3rem;
    margin: 3rem 0;
    box-shadow: var(--shadow-soft);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--color-accent-blue);
    margin-bottom: 2rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-yellow));
    border-radius: 4px;
}

.news-list {
    display: grid;
    gap: 2rem;
}

.news-item {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    padding: 1.5rem;
    border-radius: var(--border-radius-medium);
    transition: var(--transition-smooth);
    border: 1px solid var(--color-light-blue);
}

.news-item:hover {
    background: var(--color-light-blue);
    transform: translateX(10px);
}

.news-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--border-radius-medium);
}

.news-content h4 {
    color: var(--color-accent-blue);
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
}

.news-content p {
    color: var(--color-text-gray);
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-meta {
    display: flex;
    gap: 1.5rem;
    color: var(--color-text-gray);
    font-size: 0.9rem;
}

/* ========================================
   表单样式
======================================== */
.contact-form {
    background: var(--color-white);
    border-radius: var(--border-radius-large);
    padding: 3rem;
    box-shadow: var(--shadow-soft);
    max-width: 800px;
    margin: 3rem auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--color-accent-blue);
    font-weight: 600;
}

.form-control {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--color-light-blue);
    border-radius: var(--border-radius-medium);
    font-size: 1rem;
    transition: var(--transition-smooth);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-accent-blue);
    box-shadow: 0 0 0 3px rgba(90, 155, 212, 0.1);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

/* ========================================
   页脚
======================================== */
.footer-vine {
    background: linear-gradient(135deg, var(--color-accent-blue), #3A7BB4);
    color: var(--color-white);
    padding: 4rem 2rem 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.footer-section h4 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--color-accent-yellow);
}

.footer-section ul li {
    margin-bottom: 0.8rem;
}

.footer-section a {
    color: var(--color-cream-white);
    transition: var(--transition-smooth);
}

.footer-section a:hover {
    color: var(--color-accent-yellow);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--color-cream-white);
}

/* ========================================
   动画效果
======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ========================================
   响应式设计
======================================== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        background: var(--color-cream-white);
        flex-direction: column;
        padding: 2rem;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        transition: var(--transition-smooth);
    }

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

    .hamburger {
        display: flex;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .news-item {
        grid-template-columns: 1fr;
    }

    .vine-branch {
        padding-left: 2rem;
    }

    .vine-node::before {
        left: -2.5rem;
        width: 15px;
        height: 15px;
    }

    .main-vine-container {
        margin-top: 80px;
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .card-grid,
    .product-showcase {
        grid-template-columns: 1fr;
    }
}