/* ========================================
   品拓创科 - 全局样式文件
   户外简约风 | 军绿 + 浅棕 + 米白
   ======================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background-color: #f5f3ed;
    color: #2c3e2a;
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul, ol {
    list-style: none;
}

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

/* 颜色变量 */
:root {
    --army-green: #4a5d3a;
    --light-brown: #b8956a;
    --beige: #f5f3ed;
    --dark-green: #2c3e2a;
    --sand: #d4c4a8;
    --white: #ffffff;
    --text-gray: #6b6b6b;
}

/* ========================================
   顶部导航栏
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: all 0.4s ease;
    padding: 20px 0;
}

.header.scrolled {
    background: rgba(74, 93, 58, 0.95);
    backdrop-filter: blur(10px);
    padding: 12px 0;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo img {
    height: 45px;
    width: auto;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--white);
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-item {
    position: relative;
}

.nav-link {
    padding: 10px 20px;
    color: var(--white);
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 1px;
    border-radius: 25px;
    transition: all 0.3s ease;
    display: block;
}

.nav-link:hover,
.nav-link.active {
    background: var(--light-brown);
    color: var(--white);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--light-brown);
    transform: translateX(-50%);
    transition: width 0.3s ease;
}

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

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

.hamburger span {
    width: 28px;
    height: 3px;
    background: var(--white);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

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

/* 移动端菜单 */
@media (max-width: 992px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--army-green);
        flex-direction: column;
        padding: 80px 30px;
        gap: 15px;
        transition: right 0.4s ease;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.2);
    }

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

    .header-container {
        padding: 0 25px;
    }
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--dark-green);
    color: var(--beige);
    padding: 60px 0 30px;
    margin-top: 80px;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: var(--light-brown);
    font-size: 18px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--light-brown);
}

.footer-section p,
.footer-section a {
    color: var(--sand);
    font-size: 14px;
    line-height: 2;
    display: block;
}

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

.footer-bottom {
    border-top: 1px solid rgba(212, 196, 168, 0.3);
    padding-top: 25px;
    text-align: center;
}

.footer-bottom p {
    color: var(--sand);
    font-size: 13px;
}

/* ========================================
   通用组件
   ======================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 36px;
    color: var(--dark-green);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--light-brown);
}

.section-title p {
    color: var(--text-gray);
    font-size: 16px;
    max-width: 600px;
    margin: 20px auto 0;
}

.btn {
    display: inline-block;
    padding: 14px 35px;
    background: var(--army-green);
    color: var(--white);
    border: none;
    border-radius: 30px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 1px;
}

.btn:hover {
    background: var(--light-brown);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(184, 149, 106, 0.3);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--army-green);
    color: var(--army-green);
}

.btn-outline:hover {
    background: var(--army-green);
    color: var(--white);
}

/* 卡片样式 */
.card {
    background: var(--white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.4s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
}

.card-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.card-content {
    padding: 25px;
}

.card-title {
    font-size: 20px;
    color: var(--dark-green);
    margin-bottom: 12px;
}

.card-text {
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 15px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-gray);
}

/* 网格布局 */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

@media (max-width: 992px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .grid-4,
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 20px;
    }

    .section-title h2 {
        font-size: 28px;
    }
}

/* 动画效果 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

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

/* 滚动进度条 */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--light-brown);
    z-index: 1001;
    width: 0;
    transition: width 0.1s ease;
}