/* ============================================
   恒立源再生资源 - 主样式表
   all.css
   ============================================ */

/* ========== Reset & Base ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

:root {
    --primary: #1e7e34;
    --primary-dark: #166528;
    --secondary: #ffc107;
    --dark: #2c3e50;
    --light: #f8f9fa;
    --gray: #6c757d;
    --text: #333;
    --text-light: #666;
    --border: #e0e0e0;
    --transition: all 0.3s ease;
}

body {
    color: #333;
    line-height: 1.6;
    background-color: #f5f5f5;
    overflow-x: hidden;
}

a {
    color: var(--primary);
    text-decoration: none;
}

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

/* ========== 顶部栏 ========== */
.top-bar {
    background: var(--dark);
    color: #ccc;
    font-size: 14px;
    padding: 8px 0;
}

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

.contact-info p,
.social-icons p {
    display: flex;
    align-items: center;
    gap: 6px;
}

.contact-info i,
.social-icons i {
    color: var(--secondary);
}

/* ========== 导航栏 ========== */
header {
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
}

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

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

.nav-links li a {
    color: var(--text);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding-bottom: 4px;
}

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

.nav-links li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

.nav-btn {
    background: var(--primary);
    color: white;
    padding: 10px 24px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
    white-space: nowrap;
}

.nav-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--dark);
    cursor: pointer;
    padding: 8px;
}

/* ========== Hero ========== */
.hero {
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('../img/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 120px 20px;
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 16px;
    max-width: 700px;
    line-height: 1.2;
}

.hero p {
    font-size: 20px;
    margin-bottom: 32px;
    color: #e0e0e0;
    max-width: 600px;
    line-height: 1.5;
}

.hero-btns {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* ========== 按钮 ========== */
.btn {
    padding: 14px 32px;
    border-radius: 4px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    display: inline-block;
    font-size: 16px;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-outline:hover {
    background: white;
    color: var(--dark);
    transform: translateY(-2px);
}

/* ========== 通用章节标题 ========== */
.section-title {
    text-align: center;
    margin-bottom: 50px;
}

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

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--primary);
}

.section-title p {
    color: var(--gray);
    max-width: 700px;
    margin: 25px auto 0;
    font-size: 16px;
}

/* ========== 回收服务（2列网格） ========== */
.services {
    padding: 80px 20px;
    background-color: white;
}

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

.service-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    padding: 30px 28px;
    border: 1px solid var(--border);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.12);
}

.service-card .card-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 18px;
}

.service-card .card-icon {
    width: 48px;
    height: 48px;
    background: rgba(30, 126, 52, 0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 22px;
    flex-shrink: 0;
}

.service-card h3 {
    font-size: 20px;
    color: var(--dark);
}

.service-card ul {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 16px;
}

.service-card ul li {
    color: var(--text-light);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.service-card ul li::before {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 10px;
    color: var(--primary);
}

/* ========== 整厂设备拆除场景 ========== */
.scenario {
    background: var(--light);
    padding: 80px 20px;
}

.scenario-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.scenario-text h2 {
    font-size: 32px;
    color: var(--dark);
    margin-bottom: 20px;
    line-height: 1.3;
}

.scenario-text p {
    color: var(--text-light);
    margin-bottom: 24px;
    line-height: 1.8;
}

.scenario-image {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

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

/* ========== 废旧金属回收品类 ========== */
.categories {
    padding: 80px 20px;
    background: white;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.category-item {
    display: block;
    background: var(--light);
    border-radius: 8px;
    padding: 24px 20px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
}

.category-item:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
}

.category-item .cat-icon {
    font-size: 32px;
    color: var(--primary);
    margin-bottom: 12px;
}

.category-item h3 {
    font-size: 16px;
    color: var(--dark);
    font-weight: 600;
}

.category-item p {
    font-size: 13px;
    color: var(--gray);
    margin-top: 6px;
}

/* ========== 企业应用场景 ========== */
.use-cases {
    padding: 80px 20px;
    background: var(--light);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.use-case-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    transition: var(--transition);
}

.use-case-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.uc-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
}

.uc-body {
    padding: 20px 24px 32px;
    text-align: center;
}

.use-case-card .uc-icon {
    font-size: 36px;
    color: var(--primary);
    margin-bottom: 16px;
}

.use-case-card h3 {
    font-size: 18px;
    color: var(--dark);
    margin-bottom: 10px;
}

.use-case-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ========== 服务流程 ========== */
.process {
    padding: 80px 20px;
    background: white;
}

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

.process-step {
    text-align: center;
    position: relative;
}

.process-step .step-number {
    width: 56px;
    height: 56px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    margin: 0 auto 20px;
}

.process-step h3 {
    font-size: 18px;
    color: var(--dark);
    margin-bottom: 10px;
}

.process-step p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ========== 区域覆盖 ========== */
.service-areas {
    padding: 80px 20px;
    background: var(--light);
}

.areas-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.areas-content p {
    color: var(--text-light);
    margin-bottom: 30px;
    font-size: 16px;
}

.area-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
}

.area-list .area-item {
    background: white;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 500;
    color: var(--dark);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    display: flex;
    align-items: center;
    gap: 8px;
}

.area-list .area-item i {
    color: var(--primary);
}

/* ========== FAQ ========== */
.faq {
    padding: 80px 20px;
    background: white;
}

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

.faq-item {
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 12px;
    overflow: hidden;
}

.faq-item summary {
    padding: 18px 20px;
    cursor: pointer;
    font-weight: 600;
    color: var(--dark);
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '\f107';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 16px;
    color: var(--gray);
    transition: transform 0.3s;
}

.faq-item[open] summary::after {
    transform: rotate(180deg);
}

.faq-item[open] summary {
    background: rgba(30, 126, 52, 0.05);
}

.faq-answer {
    padding: 0 20px 18px;
    color: var(--text-light);
    line-height: 1.8;
    font-size: 15px;
}

.faq-answer p {
    margin-bottom: 8px;
}

.faq-answer p:last-child {
    margin-bottom: 0;
}

/* ========== CTA ========== */
.cta {
    background: linear-gradient(to right, var(--primary), #2a9d5f);
    color: white;
    text-align: center;
    padding: 80px 20px;
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
}

.cta h2 {
    font-size: 36px;
    margin-bottom: 16px;
    line-height: 1.3;
}

.cta p {
    font-size: 18px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.cta-btn {
    background: white;
    color: var(--primary);
    font-weight: 600;
}

.cta-btn:hover {
    background: var(--secondary);
    color: var(--dark);
}

.cta-btn i {
    margin-left: 8px;
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto 40px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
    color: white;
}

.footer-logo span {
    color: var(--secondary);
}

.footer-about p {
    color: #bbb;
    margin-bottom: 20px;
}

.footer-links h3, .footer-contact h3 {
    font-size: 20px;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 10px;
}

.footer-links h3::after, .footer-contact h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 2px;
    background: var(--primary);
}

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

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

.footer-links a {
    color: #bbb;
    text-decoration: none;
    transition: var(--transition);
    display: inline-block;
}

.footer-links a:hover {
    color: var(--secondary);
    transform: translateX(5px);
}

.footer-contact p {
    display: flex;
    align-items: flex-start;
    margin-bottom: 15px;
    color: #bbb;
}

.footer-contact i {
    color: var(--primary);
    margin-right: 10px;
    margin-top: 5px;
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #999;
    font-size: 14px;
}

/* ============================================
   响应式设计
   ============================================ */

@media (max-width: 992px) {
    .hero h1 {
        font-size: 40px;
    }

    .nav-links {
        display: none;
    }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        padding: 20px;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        gap: 16px;
        z-index: 999;
    }

    .mobile-menu-btn {
        display: block;
    }

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

    .uc-img {
        height: 140px;
    }

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

    .scenario-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .scenario-image {
        order: -1;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 80px 20px;
        min-height: 50vh;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero p {
        font-size: 18px;
    }

    .hero-btns {
        flex-direction: column;
        gap: 12px;
    }

    .hero-btns .btn {
        text-align: center;
    }

    .top-bar-content {
        flex-direction: column;
        gap: 6px;
        text-align: center;
    }

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

    .service-card ul {
        grid-template-columns: 1fr;
    }

    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    .uc-img {
        height: 200px;
    }

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

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

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

    .cta h2 {
        font-size: 28px;
    }

    .scenario-text h2 {
        font-size: 26px;
    }
}

@media (max-width: 576px) {
    .hero h1 {
        font-size: 26px;
    }

    .hero p {
        font-size: 16px;
    }

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

    .service-card {
        padding: 24px 20px;
    }

    .cta {
        padding: 60px 20px;
    }

    .cta h2 {
        font-size: 24px;
    }
}

/* ========== 联系弹窗 ========== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal-dialog {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 32px;
    max-width: 400px;
    width: 100%;
    position: relative;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
    animation: modalIn 0.2s ease-out;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: translateY(-12px) scale(0.97);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    font-size: 28px;
    color: #999;
    cursor: pointer;
    line-height: 1;
    padding: 4px;
    transition: color 0.2s;
}

.modal-close:hover {
    color: #333;
}

.modal-title {
    font-size: 22px;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 24px;
}

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

.modal-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.modal-contact-item i {
    font-size: 20px;
    color: var(--primary);
    margin-top: 2px;
    width: 24px;
    text-align: center;
}

.modal-contact-label {
    font-size: 13px;
    color: #999;
    margin-bottom: 2px;
}

.modal-contact-value {
    font-size: 16px;
    color: #2c3e50;
    font-weight: 600;
}

.contact-phone-trigger {
    cursor: pointer;
    transition: color 0.2s;
}

.contact-phone-trigger:hover {
    color: var(--secondary);
}

.nav-btn {
    cursor: pointer;
    border: none;
}