/*
Theme Name: Tianjin Jinzhao Yuan Cold Storage Theme
Theme URI: https://www.jinzhaoyuan.com
Author: Tianjin Jinzhao Yuan
Author URI: https://www.jinzhaoyuan.com
Description: A professional cold storage company theme inspired by coldroom-china.com. Features include hero slider, product showcase, company advantages, client cases, testimonials, FAQ section, and modern responsive design optimized for B2B industrial websites.
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: tianjin-jinzhaoyuan
Tags: custom-background, featured-images, threaded-comments, translation-ready
*/

/* ===== CSS Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0066cc;
    --primary-dark: #004c99;
    --primary-light: #3399ff;
    --secondary-color: #ff6600;
    --text-dark: #333333;
    --text-gray: #666666;
    --text-light: #999999;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --bg-dark: #1a1a1a;
    --border-color: #e0e0e0;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.2);
    --transition: all 0.3s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

/* ===== Header & Navigation ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.site-header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

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

.site-branding {
    display: flex;
    align-items: center;
}

.custom-logo {
    max-height: 60px;
    width: auto;
}

.site-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    margin-left: 10px;
}

.main-navigation {
    display: flex;
    align-items: center;
}

.main-navigation ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.main-navigation ul li {
    margin-left: 30px;
}

.main-navigation ul li a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 16px;
    transition: var(--transition);
    position: relative;
}

.main-navigation ul li a:hover,
.main-navigation ul li a.active {
    color: var(--primary-color);
}

.main-navigation ul li a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.main-navigation ul li a:hover::after,
.main-navigation ul li a.active::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-dark);
}

/* ===== Hero Section ===== */
.hero-section {
    padding-top: 80px;
    min-height: 600px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--bg-white);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('https://images.unsplash.com/photo-1586528116311-ad8dd3c8310d?w=1920') center/cover no-repeat;
    opacity: 0.15;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px;
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hero-content {
    flex: 1;
    padding-right: 50px;
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-title span {
    color: var(--secondary-color);
}

.hero-subtitle {
    font-size: 20px;
    line-height: 1.6;
    margin-bottom: 30px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 15px;
}

.btn {
    display: inline-block;
    padding: 15px 35px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 5px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background: #e65c00;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

.hero-image {
    flex: 1;
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
}

/* ===== Section Styles ===== */
section {
    padding: 80px 0;
}

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

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

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

.section-subtitle {
    font-size: 18px;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Products Section ===== */
.products-section {
    background: var(--bg-light);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.product-card {
    background: var(--bg-white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.product-image {
    position: relative;
    overflow: hidden;
    height: 200px;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.product-card:hover .product-image img {
    transform: scale(1.1);
}

.product-content {
    padding: 25px;
}

.product-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.product-description {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 15px;
    line-height: 1.5;
}

.product-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
}

.product-link::after {
    content: '→';
    margin-left: 5px;
    transition: var(--transition);
}

.product-link:hover::after {
    margin-left: 10px;
}

/* ===== Advantages Section ===== */
.advantages-section {
    background: var(--bg-white);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.advantage-card {
    text-align: center;
    padding: 40px 25px;
    background: var(--bg-light);
    border-radius: 10px;
    transition: var(--transition);
}

.advantage-card:hover {
    background: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.advantage-card:hover .advantage-icon {
    color: var(--bg-white);
}

.advantage-card:hover .advantage-title,
.advantage-card:hover .advantage-description {
    color: var(--bg-white);
}

.advantage-icon {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
    transition: var(--transition);
}

.advantage-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.advantage-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 15px;
    transition: var(--transition);
}

.advantage-description {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
    transition: var(--transition);
}

/* ===== About Section ===== */
.about-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
}

.about-text h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.about-text p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-gray);
    margin-bottom: 20px;
}

.about-features {
    list-style: none;
    margin-top: 30px;
}

.about-features li {
    padding: 10px 0;
    padding-left: 30px;
    position: relative;
    color: var(--text-dark);
}

.about-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: 700;
}

/* ===== Cases Section ===== */
.cases-section {
    background: var(--bg-white);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.case-card {
    background: var(--bg-white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.case-image {
    height: 220px;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.case-card:hover .case-image img {
    transform: scale(1.1);
}

.case-content {
    padding: 25px;
}

.case-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.case-client {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 15px;
}

.case-description {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

/* ===== Testimonials Section ===== */
.testimonials-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--bg-white);
}

.testimonials-section .section-title {
    color: var(--bg-white);
}

.testimonials-section .section-subtitle {
    color: rgba(255, 255, 255, 0.9);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.testimonial-quote {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 20px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
}

.testimonial-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--secondary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
}

.testimonial-name {
    font-weight: 600;
    font-size: 16px;
}

.testimonial-position {
    font-size: 14px;
    opacity: 0.8;
}

/* ===== FAQ Section ===== */
.faq-section {
    background: var(--bg-light);
}

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

.faq-item {
    background: var(--bg-white);
    margin-bottom: 15px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-question {
    padding: 20px 25px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 16px;
    color: var(--text-dark);
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--bg-light);
}

.faq-question::after {
    content: '+';
    font-size: 24px;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-item.active .faq-question::after {
    content: '−';
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    padding: 0 25px;
    transition: var(--transition);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 20px 25px;
}

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

/* ===== Contact CTA Section ===== */
.contact-cta-section {
    background: var(--bg-dark);
    color: var(--bg-white);
    text-align: center;
}

.contact-cta-section .section-title {
    color: var(--bg-white);
}

.contact-cta-section .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.contact-buttons {
    margin-top: 40px;
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

/* ===== Footer ===== */
.site-footer {
    background: #0d0d0d;
    color: var(--bg-white);
    padding-top: 80px;
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
}

.footer-column h4 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 25px;
    color: var(--bg-white);
    position: relative;
    padding-bottom: 15px;
}

.footer-column h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--secondary-color);
}

.footer-column p {
    color: #999;
    line-height: 1.8;
    margin-bottom: 15px;
}

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

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

.footer-column ul li a {
    color: #999;
    text-decoration: none;
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: var(--secondary-color);
    padding-left: 5px;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 20px;
}

.contact-info-item i {
    color: var(--secondary-color);
    font-size: 18px;
    margin-top: 3px;
}

.contact-info-item span {
    color: #999;
    line-height: 1.6;
}

.footer-bottom {
    background: #080808;
    padding: 25px 0;
    text-align: center;
    border-top: 1px solid #1a1a1a;
}

.footer-bottom p {
    color: #666;
    font-size: 14px;
    margin: 0;
}

.footer-bottom a {
    color: var(--secondary-color);
    text-decoration: none;
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 40px;
    }

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

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .main-navigation ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
    }

    .main-navigation ul.active {
        display: flex;
    }

    .main-navigation ul li {
        margin: 10px 0;
    }

    .hero-container {
        flex-direction: column;
        text-align: center;
        padding: 40px 20px;
    }

    .hero-content {
        padding-right: 0;
        margin-bottom: 40px;
    }

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

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

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

    section {
        padding: 60px 0;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 24px;
    }

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

    .btn {
        padding: 12px 25px;
        font-size: 14px;
    }

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

/* ===== Utility Classes ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* ===== Loading ===== */
.loading {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-white);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading.hidden {
    display: none;
}

.loading-spinner {
    border: 4px solid var(--bg-light);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===== Hero Stats Bar ===== */
.hero-stats {
    display: flex;
    gap: 30px;
    margin-top: 45px;
    flex-wrap: wrap;
}

.hero-stat {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    border-left: 3px solid var(--secondary-color);
    padding-left: 15px;
}

.stat-number {
    font-size: 28px;
    font-weight: 800;
    color: var(--bg-white);
    line-height: 1;
}

.stat-label {
    font-size: 13px;
    color: rgba(255,255,255,0.75);
    margin-top: 4px;
}

/* ===== Services Section ===== */
.services-section {
    background: var(--bg-white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background: var(--bg-light);
    border-radius: 10px;
    padding: 35px 30px;
    transition: var(--transition);
    border-bottom: 4px solid transparent;
}

.service-card:hover {
    background: var(--bg-white);
    border-bottom-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-6px);
}

.service-icon {
    font-size: 42px;
    color: var(--primary-color);
    margin-bottom: 20px;
    transition: var(--transition);
}

.service-card:hover .service-icon {
    color: var(--secondary-color);
}

.service-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.service-description {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 18px;
}

/* ===== Product Temp Tag ===== */
.product-temp {
    font-size: 13px;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 10px;
}

/* ===== Placeholders (when no image is set) ===== */
.product-placeholder,
.case-placeholder,
.about-placeholder {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #e9f2ff, #cce0ff);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    color: var(--primary-color);
    opacity: 0.6;
}

.about-placeholder {
    height: 400px;
    border-radius: 10px;
    font-size: 96px;
}

/* ===== Contact Form ===== */
.contact-form-wrapper {
    max-width: 800px;
    margin: 0 auto 50px;
    background: rgba(255,255,255,0.07);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.15);
}

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

.contact-form .form-group {
    display: flex;
    flex-direction: column;
}

.contact-form .form-group.full-width {
    grid-column: 1 / -1;
    margin-bottom: 20px;
}

.contact-form label {
    font-size: 14px;
    font-weight: 600;
    color: rgba(255,255,255,0.85);
    margin-bottom: 8px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    padding: 12px 16px;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 6px;
    background: rgba(255,255,255,0.1);
    color: var(--bg-white);
    font-size: 15px;
    transition: var(--transition);
    outline: none;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: rgba(255,255,255,0.45);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    border-color: var(--secondary-color);
    background: rgba(255,255,255,0.15);
}

.contact-form select option {
    color: var(--text-dark);
    background: var(--bg-white);
}

.form-submit {
    text-align: center;
}

.form-notice {
    font-size: 13px;
    color: rgba(255,255,255,0.55);
    margin-top: 12px;
}

.form-message {
    margin-top: 20px;
    padding: 14px 20px;
    border-radius: 6px;
    font-size: 15px;
    text-align: center;
    display: none;
}

.form-message.success {
    display: block;
    background: rgba(40,167,69,0.25);
    color: #a8ffb0;
    border: 1px solid rgba(40,167,69,0.4);
}

.form-message.error {
    display: block;
    background: rgba(220,53,69,0.25);
    color: #ffb3b3;
    border: 1px solid rgba(220,53,69,0.4);
}

/* ===== Contact Info Bar ===== */
.contact-info-bar {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 40px;
    margin-top: 20px;
}

.contact-bar-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: rgba(255,255,255,0.8);
    font-size: 15px;
}

.contact-bar-item i {
    font-size: 20px;
    color: var(--secondary-color);
}

.contact-bar-item a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: var(--transition);
}

.contact-bar-item a:hover {
    color: var(--secondary-color);
}

/* ===== Scroll Reveal ===== */
.product-card,
.service-card,
.advantage-card,
.case-card,
.testimonial-card {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.55s ease, transform 0.55s ease;
}

.product-card.visible,
.service-card.visible,
.advantage-card.visible,
.case-card.visible,
.testimonial-card.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive additions ===== */
@media (max-width: 768px) {
    .contact-form .form-row {
        grid-template-columns: 1fr;
    }

    .hero-stats {
        gap: 18px;
    }

    .contact-form-wrapper {
        padding: 25px 18px;
    }

    .contact-info-bar {
        flex-direction: column;
        align-items: center;
        gap: 18px;
    }
}