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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', 'Source Sans Pro', sans-serif;
    line-height: 1.6;
    color: #2d3748;
    overflow-x: hidden;
}

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

/* Loading Screen */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a365d 0%, #2d3748 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    transition: opacity 0.5s ease-out;
}

.loader {
    text-align: center;
    color: white;
}

.building-loader {
    position: relative;
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
}

.crane {
    width: 60px;
    height: 4px;
    background: #ff6b35;
    position: absolute;
    top: 20px;
    left: 10px;
    transform-origin: left center;
    animation: crane-rotate 2s ease-in-out infinite;
}

.crane::before {
    content: '';
    position: absolute;
    right: -10px;
    top: -8px;
    width: 4px;
    height: 20px;
    background: #ff6b35;
}

.building-blocks {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 2px;
}

.block {
    width: 12px;
    height: 12px;
    background: #ffd700;
    animation: block-build 2s ease-in-out infinite;
}

.block:nth-child(2) {
    animation-delay: 0.3s;
}

.block:nth-child(3) {
    animation-delay: 0.6s;
}

@keyframes crane-rotate {
    0%, 100% { transform: rotate(-10deg); }
    50% { transform: rotate(10deg); }
}

@keyframes block-build {
    0%, 50% { transform: translateY(20px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(26, 54, 93, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
    padding: 15px 0;
}

.navbar.scrolled {
    background: rgba(26, 54, 93, 0.98);
    padding: 10px 0;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
}

.nav-logo i {
    margin-right: 10px;
    color: #ff6b35;
    font-size: 1.8rem;
}

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

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #ff6b35;
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover {
    color: #ff6b35;
}

/* Dropdown Menu Styles */
.dropdown {
    position: relative;
}

.dropdown-toggle i {
    margin-left: 5px;
    font-size: 0.8em;
    transition: transform 0.3s ease;
}

.dropdown:hover .dropdown-toggle i {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 250px;
    background: rgba(26, 54, 93, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    list-style: none;
    padding: 10px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: 12px 20px;
    color: white;
    text-decoration: none;
    font-weight: 400;
    font-size: 0.95em;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.dropdown-menu a:hover {
    background: rgba(255, 107, 53, 0.1);
    border-left-color: #ff6b35;
    color: #ff6b35;
}

.contact-btn {
    background: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%);
    color: white;
    padding: 12px 24px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.contact-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 53, 0.4);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
}

.hero-bg-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 54, 93, 0.8) 0%, rgba(45, 55, 72, 0.6) 100%);
    z-index: -1;
}

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

.hero-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.title-line {
    display: block;
}

.gradient-text {
    background: linear-gradient(135deg, #ff6b35 0%, #ffd700 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 40px;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
}

.btn {
    padding: 15px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
}

.btn-primary {
    background: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%);
    color: white;
    border: 2px solid transparent;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(255, 107, 53, 0.4);
}

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

.btn-secondary:hover {
    background: white;
    color: #1a365d;
    transform: translateY(-3px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: #ffd700;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.8;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    color: white;
    font-size: 1.5rem;
    opacity: 0.7;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* Section Styles */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 3rem;
    font-weight: 700;
    color: #1a365d;
    margin-bottom: 20px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #ff6b35 0%, #ffd700 100%);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #4a5568;
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about {
    background: #f7fafc;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    color: #1a365d;
    margin-bottom: 20px;
    font-weight: 700;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 30px;
    color: #4a5568;
}

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

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.info-item i {
    color: #ff6b35;
    font-size: 1.5rem;
    margin-top: 5px;
}

.info-item strong {
    color: #1a365d;
    font-size: 1.1rem;
    margin-bottom: 5px;
    display: block;
}

.info-item p {
    margin: 0;
    color: #4a5568;
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.image-item {
    aspect-ratio: 1;
    overflow: hidden;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.image-item:hover {
    transform: translateY(-5px);
}

.image-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

/* Services Section */
.services {
    background: white;
}

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

.quality {
    padding: 90px 0;
    background: #f8fafc;
}

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

.quality-card {
    background: #ffffff;
    border-radius: 20px;
    padding: 40px 30px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(26, 54, 93, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.quality-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.05), rgba(255, 215, 0, 0.12));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.quality-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 35px 70px rgba(17, 24, 39, 0.12);
}

.quality-card:hover::after {
    opacity: 1;
}

.quality-icon {
    width: 70px;
    height: 70px;
    border-radius: 18px;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.2), rgba(255, 215, 0, 0.25));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ff6b35;
    font-size: 1.8rem;
    margin-bottom: 20px;
}

.quality-card h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: #1a365d;
    margin-bottom: 15px;
}

.quality-card p {
    color: #4a5568;
    line-height: 1.7;
    margin-bottom: 20px;
}

.quality-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.quality-card li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #1f2937;
    font-weight: 500;
    margin-bottom: 8px;
}

.quality-card li i {
    color: #ff6b35;
}

.quality-cta {
    margin-top: 40px;
    text-align: center;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.1), rgba(255, 215, 0, 0.1));
    border-radius: 24px;
    padding: 45px 30px;
    box-shadow: 0 25px 55px rgba(255, 149, 94, 0.25);
    border: 1px solid rgba(255, 140, 66, 0.18);
}

.quality-cta h3 {
    font-size: 1.8rem;
    color: #1a365d;
    margin-bottom: 15px;
}

.quality-cta p {
    max-width: 680px;
    margin: 0 auto 25px;
    color: #374151;
    line-height: 1.7;
}

.service-card {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.1) 0%, rgba(255, 215, 0, 0.1) 100%);
    transition: left 0.3s ease;
}

.service-card:hover::before {
    left: 0;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    position: relative;
    z-index: 1;
}

.service-icon i {
    font-size: 2rem;
    color: white;
}

.service-card h3 {
    font-size: 1.3rem;
    color: #1a365d;
    margin-bottom: 15px;
    font-weight: 600;
    position: relative;
    z-index: 1;
}

.service-card p {
    color: #4a5568;
    line-height: 1.6;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.service-image {
    width: 100%;
    height: 200px;
    border-radius: 10px;
    overflow: hidden;
    position: relative;
    z-index: 1;
}

.service-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

/* Projects Section */
.projects {
    background: #f7fafc;
}

.project-filters {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 12px 24px;
    border: 2px solid #e2e8f0;
    background: white;
    color: #4a5568;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
    background: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%);
    color: white;
    border-color: #ff6b35;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.project-card {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.project-image {
    position: relative;
    height: 300px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 54, 93, 0.9) 0%, rgba(45, 55, 72, 0.8) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-info {
    text-align: center;
    color: white;
    padding: 20px;
}

.project-info h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.project-info p {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: 15px;
}

.project-details {
    display: flex;
    justify-content: center;
    gap: 15px;
    font-size: 0.8rem;
}

.project-details span {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* Team Section */
.team {
    background: white;
}

.team-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.team-timeline {
    position: relative;
}

.team-timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(135deg, #ff6b35 0%, #ffd700 100%);
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 40px;
    position: relative;
}

.timeline-year {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 0.9rem;
    position: relative;
    z-index: 1;
}

.timeline-content {
    margin-left: 30px;
    background: white;
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    flex: 1;
}

.timeline-content h3 {
    color: #1a365d;
    font-size: 1.2rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.timeline-content p {
    color: #4a5568;
    line-height: 1.6;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.team-image {
    position: relative;
    aspect-ratio: 1;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.team-image:hover {
    transform: translateY(-5px);
}

.team-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.team-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(26, 54, 93, 0.9));
    color: white;
    padding: 20px;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.team-image:hover .team-overlay {
    transform: translateY(0);
}

.team-overlay h4 {
    font-size: 1.1rem;
    margin-bottom: 5px;
    font-weight: 600;
}

.team-overlay p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Testimonials Section */
.testimonials {
    background: linear-gradient(135deg, #1a365d 0%, #2d3748 100%);
    color: white;
}

.testimonials-slider {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.testimonial-item {
    display: none;
    text-align: center;
    padding: 40px;
}

.testimonial-item.active {
    display: block;
}

.testimonial-text {
    margin-bottom: 30px;
}

.testimonial-text i {
    font-size: 3rem;
    color: #ff6b35;
    margin-bottom: 20px;
}

.testimonial-text p {
    font-size: 1.3rem;
    line-height: 1.8;
    font-style: italic;
    opacity: 0.9;
}

.testimonial-author h4 {
    font-size: 1.2rem;
    margin-bottom: 5px;
    color: #ffd700;
}

.testimonial-author span {
    opacity: 0.8;
}

.testimonial-nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 40px;
}

.nav-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.5);
    background: transparent;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-dot.active,
.nav-dot:hover {
    background: #ff6b35;
    border-color: #ff6b35;
}

/* Contact Section */
.contact {
    background: #f7fafc;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 40px;
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    font-size: 1.5rem;
    color: white;
}

.contact-details h3 {
    color: #1a365d;
    font-size: 1.2rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.contact-details p {
    color: #4a5568;
    margin-bottom: 5px;
}

.contact-details a {
    color: #ff6b35;
    text-decoration: none;
    font-weight: 500;
}

.contact-details a:hover {
    text-decoration: underline;
}

.contact-details span {
    color: #718096;
    font-size: 0.9rem;
}

.contact-form {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 25px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #ff6b35;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.submit-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(255, 107, 53, 0.4);
}

/* Footer */
.footer {
    background: #1a365d;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    color: #ffd700;
    margin-bottom: 20px;
    font-size: 1.2rem;
    font-weight: 600;
}

.footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    font-size: 1.3rem;
    font-weight: 700;
}

.footer-logo i {
    margin-right: 10px;
    color: #ff6b35;
    font-size: 1.5rem;
}

.footer-section p {
    line-height: 1.6;
    opacity: 0.9;
    margin-bottom: 20px;
}

.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;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: #ff6b35;
    transform: translateY(-2px);
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #ff6b35;
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.contact-info i {
    color: #ff6b35;
    width: 16px;
}

.contact-info a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

.contact-info a:hover {
    color: #ff6b35;
}

.footer-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 40px 0 20px;
}

.footer-bottom-content {
    text-align: center;
    opacity: 0.8;
}

.footer-bottom-content p {
    margin-bottom: 5px;
    font-size: 0.9rem;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(255, 107, 53, 0.4);
}

.back-to-top.show {
    display: flex;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .quality-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .about-content,
    .team-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 50px;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: rgba(26, 54, 93, 0.98);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 20px 0;
        gap: 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-item {
        margin: 10px 0;
    }

    /* Mobile dropdown menu styles */
    .dropdown-menu {
        position: static;
        background: rgba(45, 55, 72, 0.95);
        box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
        margin-top: 10px;
        border-radius: 0;
        opacity: 1;
        visibility: visible;
        transform: none;
        transition: none;
        display: none;
        min-width: auto;
        width: 100%;
    }

    .dropdown.active .dropdown-menu {
        display: block;
    }

    .dropdown-toggle i {
        transition: transform 0.3s ease;
    }

    .dropdown.active .dropdown-toggle i {
        transform: rotate(180deg);
    }
    
    .nav-contact-btn {
        display: none;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 30px;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .quality-grid {
        grid-template-columns: 1fr;
    }
    
    .quality-cta {
        padding: 35px 24px;
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .project-filters {
        justify-content: center;
    }
    
    .filter-btn {
        font-size: 0.9rem;
        padding: 10px 20px;
    }
    
    .image-grid,
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-filters {
        flex-direction: column;
        align-items: center;
    }
    
    .quality-card {
        padding: 30px 24px;
    }

    .quality-cta h3 {
        font-size: 1.5rem;
    }

    .quality-cta p {
        font-size: 1rem;
    }
    
    .image-grid,
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-form {
        padding: 30px 20px;
    }
}

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

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

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.6s ease;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.6s ease;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Loading Animation */
.loading-hidden {
    opacity: 0;
    pointer-events: none;
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #e55a2b 0%, #e57a35 100%);
}

/* ========== 建筑工程专业功能样式 ========== */

/* 项目进度追踪系统 */
.project-tracker {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    position: relative;
    overflow: hidden;
}

.project-tracker::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60' viewBox='0 0 60 60'%3E%3Cg fill-opacity='0.03'%3E%3Crect fill='%23ff6b35' width='1' height='1'/%3E%3C/g%3E%3C/svg%3E");
    z-index: -1;
}

.tracker-dashboard {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 20px 60px rgba(26, 54, 93, 0.15);
    border: 1px solid rgba(255, 107, 53, 0.1);
    position: relative;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #f1f5f9;
}

.dashboard-header h3 {
    color: #1a365d;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.dashboard-status {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.status-indicator {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-indicator.active {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    animation: pulse-status 2s ease-in-out infinite;
}

@keyframes pulse-status {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.last-update {
    font-size: 0.8rem;
    color: #64748b;
}

.project-timeline {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.timeline-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    border-radius: 15px;
    border: 2px solid transparent;
    transition: all 0.3s ease;
    position: relative;
}

.timeline-item:hover {
    border-color: #ff6b35;
    transform: translateX(10px);
    box-shadow: 0 10px 30px rgba(255, 107, 53, 0.2);
}

.timeline-icon {
    font-size: 2rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #ff6b35, #ff8c42);
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 8px 20px rgba(255, 107, 53, 0.3);
}

.timeline-content {
    flex: 1;
}

.timeline-content h4 {
    color: #1a365d;
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: #e2e8f0;
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #ff6b35, #ffd700);
    border-radius: 6px;
    transition: width 2s ease-in-out;
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: shimmer 2s ease-in-out infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    font-size: 0.9rem;
    color: #475569;
    font-weight: 600;
}

.construction-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.metric-card {
    background: white;
    padding: 1.5rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(26, 54, 93, 0.1);
    border: 2px solid transparent;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 53, 0.1), transparent);
    transition: left 0.5s ease;
}

.metric-card:hover::before {
    left: 100%;
}

.metric-card:hover {
    border-color: #ff6b35;
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(255, 107, 53, 0.2);
}

.metric-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.metric-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: #1a365d;
    margin-bottom: 0.25rem;
    display: block;
}

.metric-label {
    color: #64748b;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.metric-trend {
    font-size: 0.8rem;
    padding: 0.25rem 0.5rem;
    border-radius: 10px;
    font-weight: 600;
}

.metric-trend.positive {
    background: linear-gradient(135deg, #dcfce7, #bbf7d0);
    color: #166534;
}

.metric-trend.stable {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    color: #92400e;
}

/* 建材成本估算器 */
.cost-calculator {
    background: linear-gradient(135deg, #1a365d 0%, #2d3748 100%);
    color: white;
    position: relative;
}

.cost-calculator::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'%3E%3Cg fill-opacity='0.05'%3E%3Cpolygon fill='%23ffffff' points='50 0 60 40 100 50 60 60 50 100 40 60 0 50 40 40'/%3E%3C/g%3E%3C/svg%3E");
}

.calculator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.calculator-form,
.calculator-result {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.calculator-form h3,
.calculator-result h3 {
    color: white;
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    font-weight: 600;
}

.form-grid {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.input-group input,
.input-group select {
    padding: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.input-group input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: #ff6b35;
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 20px rgba(255, 107, 53, 0.3);
}

.calculate-btn {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #ff6b35, #ff8c42);
    color: white;
    border: none;
    border-radius: 15px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.calculate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(255, 107, 53, 0.4);
}

.result-display {
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-placeholder {
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
}

.result-placeholder i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: rgba(255, 255, 255, 0.5);
}

.cost-breakdown {
    display: grid;
    gap: 1rem;
}

.cost-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.cost-item-label {
    font-weight: 500;
}

.cost-item-value {
    font-weight: 700;
    color: #ffd700;
}

.total-cost {
    margin-top: 1rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, #ff6b35, #ff8c42);
    border-radius: 15px;
    text-align: center;
}

.total-cost .cost-label {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.total-cost .cost-value {
    font-size: 2rem;
    font-weight: 800;
}

/* 施工设备展示 */
.equipment {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
}

.equipment-showcase {
    margin-bottom: 3rem;
}

.equipment-category {
    margin-bottom: 3rem;
}

.equipment-category h3 {
    color: #1a365d;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    padding-left: 1rem;
    border-left: 4px solid #ff6b35;
}

.equipment-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.equipment-item {
    background: white;
    padding: 1.5rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(26, 54, 93, 0.1);
    border: 2px solid transparent;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.equipment-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.05), rgba(255, 140, 66, 0.05));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.equipment-item:hover::before {
    opacity: 1;
}

.equipment-item:hover {
    border-color: #ff6b35;
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(255, 107, 53, 0.2);
}

.equipment-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.equipment-item h4 {
    color: #1a365d;
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.equipment-specs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.equipment-specs span {
    font-size: 0.8rem;
    color: #64748b;
    background: #f8fafc;
    padding: 0.25rem 0.5rem;
    border-radius: 5px;
}

.equipment-status {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.equipment-status.available {
    background: linear-gradient(135deg, #dcfce7, #bbf7d0);
    color: #166534;
}

.equipment-status.in-use {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    color: #92400e;
}

.equipment-status.maintenance {
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    color: #991b1b;
}

.equipment-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3rem;
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 15px 40px rgba(26, 54, 93, 0.1);
}

.stat-circle {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.progress-ring {
    transform: rotate(-90deg);
}

.equipment-progress {
    stroke-dasharray: 339.292;
    stroke-dashoffset: 339.292;
    stroke-linecap: round;
    transition: stroke-dashoffset 2s ease-in-out;
}

.stat-text {
    position: absolute;
    text-align: center;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    color: #1a365d;
    display: block;
}

.stat-label {
    font-size: 0.8rem;
    color: #64748b;
    font-weight: 500;
}

.equipment-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.equipment-metrics .metric-item {
    background: #f8fafc;
    padding: 1.5rem;
    border-radius: 15px;
    text-align: center;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.equipment-metrics .metric-item:hover {
    border-color: #ff6b35;
    background: white;
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(255, 107, 53, 0.15);
}

/* 安全监控中心 */
.safety-monitor {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: white;
    position: relative;
}

.safety-monitor::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40' viewBox='0 0 40 40'%3E%3Cg fill-opacity='0.05'%3E%3Ccircle fill='%23ffffff' cx='20' cy='20' r='2'/%3E%3C/g%3E%3C/svg%3E");
}

.safety-dashboard {
    margin-bottom: 3rem;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.safety-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(15px);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.safety-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.3);
}

.safety-card.primary {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(5, 150, 105, 0.2));
    border-color: rgba(16, 185, 129, 0.3);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.card-header h3 {
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0;
}

.safety-level {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.safety-level.excellent {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.status-indicator.normal {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
}

.alert-count {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.safety-score {
    display: flex;
    justify-content: center;
}

.score-circle {
    position: relative;
    width: 120px;
    height: 120px;
}

.score-ring {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.safety-progress {
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    stroke-linecap: round;
    transition: stroke-dashoffset 2s ease-in-out;
}

.score-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.score-number {
    font-size: 2rem;
    font-weight: 800;
    color: #10b981;
    display: block;
}

.score-unit {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.8);
}

.personnel-stats,
.real-time-data {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.stat-row,
.data-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-value,
.data-value {
    font-weight: 700;
}

.data-value.normal {
    color: #10b981;
}

.data-time {
    color: #64748b;
    font-family: 'Courier New', monospace;
    font-weight: 600;
}

.risk-alerts {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.alert-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    border-left: 4px solid #10b981;
}

.alert-item.safe {
    border-left-color: #10b981;
}

.alert-item i {
    color: #10b981;
}

.safety-certifications {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(15px);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.safety-certifications h3 {
    color: white;
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.certification-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.cert-item {
    background: rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: 15px;
    text-align: center;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.cert-item:hover {
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

.cert-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    animation: rotate 4s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.cert-item h4 {
    color: white;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.cert-item p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.8rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .dashboard-grid,
    .construction-metrics,
    .equipment-grid,
    .equipment-metrics,
    .certification-grid {
        grid-template-columns: 1fr;
    }

    .calculator-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .equipment-stats {
        flex-direction: column;
        gap: 2rem;
    }

    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}