/* ==================== 基础变量 ==================== */
:root {
    --primary: #003366;       /* 深蓝色 - 主色 */
    --secondary: #0066CC;     /* 蓝色 */
    --accent: #00A3E0;       /* 亮蓝色 */
    --gold: #D4AF37;         /* 金色 - 能源感 */
    --dark: #1a1a2e;         /* 深色背景 */
    --light: #f5f7fa;        /* 浅色背景 */
    --white: #ffffff;
    --text: #333333;
    --text-light: #666666;
}

/* ==================== 基础重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
    color: var(--text);
    line-height: 1.6;
}

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

ul {
    list-style: none;
}

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

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 45px;
    height: 45px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 18px;
}

.logo-text {
    font-size: 22px;
    font-weight: bold;
    color: var(--primary);
}

.logo-text span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 35px;
}

.nav-links a {
    font-size: 15px;
    transition: color 0.3s;
}

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

.nav-cta {
    background: var(--primary);
    color: white !important;
    padding: 10px 25px;
    border-radius: 5px;
}

.nav-cta:hover {
    background: var(--secondary);
}

.lang-switch {
    display: flex;
    gap: 5px;
    font-size: 13px;
}

.lang-switch a {
    color: var(--text-light);
}

.lang-switch a.active {
    color: var(--primary);
    font-weight: bold;
}

/* ==================== Hero 区域 ==================== */
.hero {
    height: 100vh;
    background: linear-gradient(135deg, var(--dark) 0%, var(--primary) 100%);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: radial-gradient(circle at 20% 30%, rgba(0,163,224,0.1) 0%, transparent 50%),
                      radial-gradient(circle at 80% 70%, rgba(0,163,224,0.08) 0%, transparent 50%);
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text h1 {
    font-size: 52px;
    color: white;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-text h1 span {
    color: var(--gold);
}

.hero-text p {
    font-size: 18px;
    color: rgba(255,255,255,0.8);
    margin-bottom: 35px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.btn-primary {
    display: inline-block;
    background: var(--gold);
    color: var(--dark);
    padding: 15px 35px;
    border-radius: 5px;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: #e5c048;
    transform: translateY(-2px);
}

.btn-secondary {
    display: inline-block;
    background: transparent;
    color: white;
    padding: 15px 35px;
    border: 2px solid white;
    border-radius: 5px;
    font-size: 16px;
    transition: all 0.3s;
}

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

.lng-tank {
    width: 100%;
    height: 400px;
    background: linear-gradient(180deg, rgba(0,163,224,0.2) 0%, rgba(0,102,204,0.3) 100%);
    border-radius: 20px;
    border: 2px solid rgba(0,163,224,0.3);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.tank-icon {
    font-size: 80px;
    margin-bottom: 20px;
}

.tank-info {
    color: white;
    text-align: center;
}

.tank-info h3 {
    font-size: 28px;
    margin-bottom: 10px;
}

.tank-info p {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
}

/* ==================== 统计数据 ==================== */
.stats {
    background: white;
    padding: 60px 20px;
}

.stats-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.stat-item {
    text-align: center;
    padding: 30px;
    border-radius: 10px;
    background: var(--light);
}

.stat-number {
    font-size: 48px;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
}

/* ==================== 服务板块 ==================== */
.services {
    padding: 100px 20px;
    background: var(--light);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-tag {
    color: var(--accent);
    font-size: 14px;
    font-weight: bold;
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.section-title {
    font-size: 36px;
    color: var(--primary);
    margin-bottom: 15px;
}

.section-desc {
    color: var(--text-light);
    font-size: 16px;
}

.services-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    box-shadow: 0 5px 30px rgba(0,0,0,0.05);
    transition: all 0.3s;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

.service-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    margin-bottom: 25px;
}

.service-card h3 {
    font-size: 20px;
    color: var(--primary);
    margin-bottom: 15px;
}

.service-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

/* ==================== 关于我们 ==================== */
.about {
    padding: 100px 20px;
    background: white;
}

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

.about-content .section-tag,
.about-content .section-title {
    text-align: left;
}

.about-text {
    color: var(--text-light);
    margin-bottom: 30px;
    line-height: 1.8;
}

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

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-item span {
    color: var(--accent);
    font-size: 20px;
}

.feature-item p {
    font-size: 14px;
    color: var(--text);
}

.about-image {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    height: 450px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.about-image::before {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    border: 50px solid rgba(255,255,255,0.1);
    border-radius: 50%;
    top: -50px;
    right: -50px;
}

.about-image::after {
    content: '';
    position: absolute;
    width: 150px;
    height: 150px;
    border: 40px solid rgba(255,255,255,0.1);
    border-radius: 50%;
    bottom: -30px;
    left: -30px;
}

.about-image-content {
    text-align: center;
    color: white;
    z-index: 1;
}

.about-image-content .icon {
    font-size: 80px;
    margin-bottom: 20px;
}

.about-image-content h3 {
    font-size: 24px;
}

/* ==================== 全球布局 ==================== */
.global {
    padding: 100px 20px;
    background: var(--dark);
}

.global .section-header {
    margin-bottom: 60px;
}

.global .section-tag {
    color: var(--gold);
}

.global .section-title {
    color: white;
}

.global .section-desc {
    color: rgba(255,255,255,0.6);
}

.map-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
}

.world-map {
    background: rgba(255,255,255,0.05);
    border-radius: 20px;
    padding: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.map-placeholder {
    text-align: center;
    color: rgba(255,255,255,0.5);
}

.map-placeholder .icon {
    font-size: 100px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.regions {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.region-card {
    background: rgba(255,255,255,0.05);
    padding: 25px;
    border-radius: 15px;
    border-left: 4px solid var(--gold);
}

.region-card h4 {
    color: white;
    font-size: 18px;
    margin-bottom: 10px;
}

.region-card p {
    color: rgba(255,255,255,0.6);
    font-size: 13px;
}

/* ==================== 新闻资讯 ==================== */
.news {
    padding: 100px 20px;
    background: white;
}

.news-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 30px;
}

.news-main {
    background: var(--light);
    border-radius: 15px;
    overflow: hidden;
}

.news-main-img {
    height: 250px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
}

.news-main-content {
    padding: 25px;
}

.news-main-content h3 {
    font-size: 20px;
    color: var(--primary);
    margin-bottom: 10px;
}

.news-main-content p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 15px;
}

.news-date {
    font-size: 12px;
    color: var(--accent);
}

.news-list {
    display: flex;
    flex-direction: column;
}

.news-item {
    padding: 20px 0;
    border-bottom: 1px solid var(--light);
}

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

.news-item-content h4 {
    font-size: 14px;
    color: var(--text);
    margin-bottom: 5px;
}

.news-item-content p {
    font-size: 12px;
    color: var(--text-light);
}

/* ==================== 联系我们 ==================== */
.contact {
    padding: 100px 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--dark) 100%);
}

.contact .section-header {
    margin-bottom: 60px;
}

.contact .section-title {
    color: white;
}

.contact .section-desc {
    color: rgba(255,255,255,0.7);
}

.contact-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-form {
    background: white;
    padding: 40px;
    border-radius: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    color: var(--text);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
}

.form-group textarea {
    height: 120px;
    resize: none;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.contact-info {
    color: white;
}

.contact-info h3 {
    font-size: 24px;
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.contact-text h4 {
    font-size: 14px;
    margin-bottom: 5px;
}

.contact-text p {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--dark);
    padding: 60px 20px 30px;
}

.footer-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-about .logo {
    margin-bottom: 20px;
}

.footer-about .logo-text {
    color: white;
}

.footer-about p {
    color: rgba(255,255,255,0.6);
    font-size: 13px;
    line-height: 1.8;
}

.footer-links h4 {
    color: white;
    font-size: 16px;
    margin-bottom: 20px;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255,255,255,0.6);
    font-size: 13px;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: rgba(255,255,255,0.5);
    font-size: 13px;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.3s;
}

.social-links a:hover {
    background: var(--accent);
}

/* ==================== 响应式 ==================== */
@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-buttons {
        justify-content: center;
    }

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

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

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

    .map-container {
        grid-template-columns: 1fr;
    }

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

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

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero-text h1 {
        font-size: 36px;
    }

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

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

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

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

    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}