/**
 * Author: YuanYuan
 * Project: KMI Energy Corporate Website
 */
:root {
    --primary-orange: #f05123;
    --primary-orange-hover: #e0441a;
    --dark-blue: #0b1a2d;
    --darker-blue: #050d18;
    --white: #ffffff;
    --light-grey: #f5f7fa;
    --mid-grey: #8892b0;
    --text-dark: #2d3748;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body, html {
    font-family: 'Inter', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    scroll-behavior: smooth;
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

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

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

.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }
.bg-light { background-color: var(--light-grey); }

/* Utilities */
.section-title {
    margin-bottom: 40px;
}
.section-title h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--dark-blue);
    margin-bottom: 12px;
}
.title-line {
    width: 60px;
    height: 4px;
    background-color: var(--primary-orange);
}

.btn-primary {
    display: inline-block;
    background-color: var(--primary-orange);
    color: var(--white);
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 4px;
    transition: var(--transition);
}
.btn-primary:hover {
    background-color: var(--primary-orange-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(240, 81, 35, 0.2);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 0;
    z-index: 1000;
    transition: var(--transition);
    background: transparent;
}
.navbar.scrolled {
    background: rgba(11, 26, 45, 0.95);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}
.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--white);
}
.logo span {
    color: var(--primary-orange);
}
.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}
.nav-links li a {
    color: var(--white);
    font-weight: 600;
    font-size: 1rem;
    position: relative;
}
.nav-links li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    background: var(--primary-orange);
    bottom: -4px;
    left: 0;
    transition: var(--transition);
}
.nav-links li a:hover::after {
    width: 100%;
}
.hamburger {
    display: none;
    cursor: pointer;
}

/* Hero Section */
.hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
}
.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}
.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, rgba(5, 13, 24, 0.8) 0%, rgba(11, 26, 45, 0.4) 100%);
    z-index: 2;
}
.hero-content {
    position: relative;
    z-index: 3;
    max-width: 800px;
    margin-left: 10%;
    color: var(--white);
}
.hero-content h1 {
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
}
.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

/* Animations */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* About Section */
.about-section {
    padding: 100px 0;
}
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.about-text h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--dark-blue);
}
.about-text p {
    font-size: 1.1rem;
    color: var(--text-dark);
}
.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}
.stat-item {
    background: var(--light-grey);
    padding: 30px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-orange);
    transition: var(--transition);
}
.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}
.stat-item h4 {
    display: inline-block;
    font-size: 3rem;
    font-weight: 800;
    color: var(--dark-blue);
}
.stat-item span {
    font-size: 2rem;
    color: var(--primary-orange);
    font-weight: 800;
}

/* Core Business */
.business-section {
    padding: 100px 0;
}
.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}
.card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}
.card-img-wrapper {
    height: 220px;
    overflow: hidden;
    background: var(--mid-grey);
}
.card-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.card:hover .card-img-wrapper img {
    transform: scale(1.05);
}
.card-content {
    padding: 30px;
    position: relative;
}
.card-icon {
    position: absolute;
    top: -20px;
    right: 30px;
    background: var(--primary-orange);
    color: var(--white);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    border-radius: 50%;
    font-size: 1.1rem;
}
.card-content h3 {
    font-size: 1.25rem;
    color: var(--dark-blue);
    margin-bottom: 12px;
}
.card-content p {
    font-size: 0.95rem;
    color: var(--mid-grey);
}

/* Global Maintenance Section */
.maintenance-section {
    padding: 100px 0;
    background: var(--darker-blue);
    color: var(--white);
}
.maintenance-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.maintenance-section .section-title h2 {
    color: var(--white);
}
.maintenance-section h3 {
    font-size: 1.8rem;
    margin-bottom: 24px;
}
.maintenance-section .benefits {
    list-style: none;
    margin-top: 24px;
}
.maintenance-section .benefits li {
    margin-bottom: 16px;
    position: relative;
    padding-left: 24px;
}
.maintenance-section .benefits li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-orange);
    font-weight: bold;
}
.image-box {
    border-radius: 8px;
    overflow: hidden;
    height: 400px;
    background: var(--mid-grey);
}
.image-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Contact Modal form compact styles */
.modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
}
.modal.show {
    display: flex;
    animation: fadeIn 0.3s ease;
}
.modal-content.contact-container {
    background: var(--white);
    padding: 30px;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    position: relative;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    animation: slideUp 0.3s ease;
}
.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    color: #999;
    cursor: pointer;
    transition: 0.2s;
}
.close-modal:hover {
    color: var(--dark-blue);
}
.contact-container h2 {
    text-align: center;
    margin-bottom: 20px;
    color: var(--dark-blue);
    font-size: 1.5rem;
}
.form-row {
    display: flex;
    gap: 15px;
}
.form-row .form-group {
    flex: 1;
}
.form-group {
    margin-bottom: 15px;
}
.form-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-dark);
    font-weight: 600;
    font-size: 0.9rem;
}
.form-group input, .form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    background: #fdfdfd;
}
.form-group input:focus, .form-group textarea:focus {
    border-color: var(--primary-orange);
    outline: none;
    box-shadow: 0 0 0 2px rgba(217, 61, 0, 0.1);
    background: var(--white);
}
.form-group textarea {
    resize: vertical;
    min-height: 80px;
}
.submit-btn {
    display: inline-block;
    width: 100%;
    padding: 12px;
    background: var(--primary-orange);
    color: var(--white);
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}
.submit-btn:hover {
    background: #bf3400;
}
.submit-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}
.form-message {
    margin-top: 12px;
    text-align: center;
    font-weight: 600;
    display: none;
    padding: 10px;
    border-radius: 4px;
    font-size: 0.9rem;
}
.form-message.success {
    color: #155724;
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    display: block;
}
.form-message.error {
    color: #721c24;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    display: block;
}

/* Floating button */
.floating-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-orange);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(217, 61, 0, 0.4);
    z-index: 9998;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: 0.3s;
}
.floating-btn:hover {
    transform: translateY(-3px) scale(1.05);
    background: #bf3400;
}
@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Footer */
.footer {
    background: var(--dark-blue);
    color: var(--white);
    padding: 80px 0 20px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}
.footer-col h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--primary-orange);
}
.footer-col h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
}
.footer-col ul {
    list-style: none;
}
.footer-col ul li {
    margin-bottom: 10px;
}
.footer-col ul li a:hover {
    color: var(--primary-orange);
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    text-align: center;
    color: var(--mid-grey);
    font-size: 0.9rem;
}

/* Language Switcher */
.lang-switcher {
    position: relative;
    display: flex;
    align-items: center;
}
.lang-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
}
.globe-icon {
    width: 20px;
    height: 20px;
    color: var(--primary-orange);
}
.chevron-icon {
    width: 16px;
    height: 16px;
    color: var(--primary-orange);
}
.lang-dropdown {
    position: absolute;
    top: 150%;
    right: -10px;
    background: var(--white);
    min-width: 160px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border-radius: 4px;
    padding: 10px 0;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 1001;
}
.lang-dropdown::before {
    content: '';
    position: absolute;
    top: -8px;
    right: 20px;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid var(--white);
}
.lang-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.lang-dropdown-header {
    padding: 10px 20px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark-blue);
    border-bottom: 1px solid #eee;
    margin-bottom: 5px;
}
.lang-dropdown li a {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    color: var(--text-dark);
    font-size: 0.95rem;
    font-weight: 500;
}
.lang-dropdown li a:hover {
    background-color: var(--light-grey);
    color: var(--primary-orange);
}
.radio-btn {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--mid-grey);
    border-radius: 50%;
    margin-right: 10px;
    position: relative;
    transition: var(--transition);
}
.lang-dropdown li a.active .radio-btn {
    border-color: var(--primary-orange);
}
.lang-dropdown li a.active .radio-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background-color: var(--primary-orange);
    border-radius: 50%;
}

/* Subpage Specific Styles */
.subpage-hero {
    height: 60vh;
    min-height: 400px;
}
.subpage-hero .hero-content {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    max-width: 900px;
}
.strength-section, .product-section, .global-section {
    padding: 80px 0;
}
.strength-grid, .product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 40px;
}
.strength-card {
    background: var(--white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    border-top: 4px solid var(--primary-orange);
    transition: var(--transition);
}
.strength-card:hover {
    transform: translateY(-5px);
}
.strength-card h3 {
    color: var(--dark-blue);
    font-size: 1.5rem;
    margin-bottom: 15px;
}
.strength-card p {
    color: var(--text-dark);
}
.product-card {
    background: var(--light-grey);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
}
.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}
.product-img {
    height: 200px;
    background: var(--mid-grey);
    width: 100%;
    object-fit: cover;
}
.product-info {
    padding: 30px;
}
.product-info h3 {
    color: var(--dark-blue);
    font-size: 1.4rem;
    margin-bottom: 15px;
}
.global-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}
.global-content p {
    font-size: 1.2rem;
    color: var(--text-dark);
}

/* Navbar Dropdown */
.nav-links li.dropdown {
    position: relative;
    padding-bottom: 20px;
    margin-bottom: -20px;
}
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: var(--white);
    min-width: 200px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border-radius: 4px;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    padding: 10px 0;
    z-index: 1000;
}
.nav-links li.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}
.dropdown-menu li a {
    display: block;
    padding: 10px 20px !important;
    color: var(--text-dark) !important;
    font-size: 0.95rem !important;
    font-weight: 500 !important;
    white-space: nowrap;
}
.dropdown-menu li a::after {
    display: none !important;
}
.dropdown-menu li a:hover {
    background-color: var(--light-grey);
    color: var(--primary-orange) !important;
}

/* Responsive */
@media (max-width: 900px) {
    .dropdown-menu {
        position: static;
        box-shadow: none;
        transform: none;
        background: transparent;
        text-align: center;
        display: none;
        padding-top: 10px;
        opacity: 1;
        visibility: visible;
    }
    .nav-links li.dropdown:hover .dropdown-menu {
        display: block;
    }
    .dropdown-menu li a {
        color: var(--white) !important;
    }
    .about-grid, .maintenance-content, .footer-grid {
        grid-template-columns: 1fr;
    }
    .hero-content h1 {
        font-size: 3rem;
    }
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(11, 26, 45, 0.98);
        padding: 20px;
        text-align: center;
    }
    .nav-links.active {
        display: flex;
    }
    .hamburger {
        display: block;
    }
    .hamburger .bar {
        display: block;
        width: 25px;
        height: 3px;
        margin: 5px auto;
        -webkit-transition: all 0.3s ease-in-out;
        transition: all 0.3s ease-in-out;
        background-color: var(--primary-orange);
    }
    
    .lang-switcher {
        margin-top: 20px;
        justify-content: center;
    }
    .lang-dropdown {
        position: static;
        box-shadow: none;
        transform: none;
        background: transparent;
        text-align: left;
    }
    .lang-dropdown::before {
        display: none;
    }
    .lang-dropdown li a {
        color: var(--white);
        justify-content: center;
    }
    .lang-dropdown-header {
        color: var(--primary-orange);
        text-align: center;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
}