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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: #1a1a1a;
    background-color: #fafafa;
}

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

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

/* Container */
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 30px;
}

/* Header Navigation */
.header {
    background-color: #fff;
    border-bottom: 1px solid #eaeaea;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    position: relative;
    z-index: 100;
}

.logo img {
    height: 45px;
    width: auto;
    display: block;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-list a {
    font-size: 14px;
    font-weight: 500;
    color: #2c3e50;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: color 0.3s ease;
}

.nav-list a:hover {
    color: #c9a227;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.hamburger-line {
    width: 100%;
    height: 3px;
    background-color: #2c3e50;
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    z-index: 999;
    height: auto;
    overflow: hidden;
    transition: height 0.4s ease, opacity 0.3s ease;
    opacity: 0;
    height: 0;
}

.mobile-menu.active {
    height: auto;
    opacity: 1;
}

.mobile-nav-list {
    list-style: none;
    padding: 20px 30px;
}

.mobile-nav-list li {
    border-bottom: 1px solid #eee;
}

.mobile-nav-list li:last-child {
    border-bottom: none;
}

.mobile-nav-list a {
    display: block;
    padding: 18px 0;
    font-size: 16px;
    font-weight: 500;
    color: #2c3e50;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: color 0.3s ease, padding-left 0.3s ease;
}

.mobile-nav-list a:hover {
    color: #c9a227;
    padding-left: 10px;
}

/* Banner */
.banner {
    width: 100%;
    overflow: hidden;
    background-color: #f0f0f0;
}

.banner-pc {
    display: block;
    max-height: 400px;
}

.banner-mobile {
    display: none;
    max-height: 300px;
}

.banner-pc img,
.banner-mobile img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    object-position: center;
}

.banner-mobile img {
    height: 300px;
}

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

.section-main-title {
    font-size: 36px;
    font-weight: 300;
    color: #222;
    margin-bottom: 60px;
    letter-spacing: 2px;
    text-align: center;
}

/* Footer - Blue Gradient Background */
.footer {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 50%, #90caf9 100%);
    color: #000;
    padding: 80px 0 30px;
}

.vision-section {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px;
}

.vision-section h3 {
    font-size: 14px;
    color: #1565c0;
    text-transform: uppercase;
    letter-spacing: 4px;
    margin-bottom: 25px;
    font-weight: 600;
}

.vision-section p {
    font-size: 18px;
    line-height: 1.9;
    color: #000;
    font-weight: 400;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(21, 101, 192, 0.2);
}

.footer-bottom p {
    font-size: 14px;
    color: #000;
    font-weight: 500;
}

/* Video Gallery Styles */
.video-gallery {
    padding: 4rem 0;
}

.video-header {
    text-align: center;
    margin-bottom: 3rem;
}

.video-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.video-header p {
    font-size: 1.1rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

.video-card {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.video-thumbnail {
    position: relative;
    height: 250px;
    overflow: hidden;
}

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

.video-card:hover .video-thumbnail img {
    transform: scale(1.05);
}

.play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: rgba(0, 102, 204, 0.8);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 24px;
    transition: all 0.3s ease;
    z-index: 10;
}

.play-icon:hover {
    background: rgba(0, 102, 204, 1);
    transform: translate(-50%, -50%) scale(1.1);
}

.video-info {
    padding: 1.5rem;
}

.video-info h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.video-info p {
    color: #666;
    margin-bottom: 1rem;
    line-height: 1.5;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: #999;
}

.video-duration {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.video-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Pagination Styles */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: 3rem;
}

.pagination-btn {
    padding: 0.75rem 1.5rem;
    border: 1px solid #ddd;
    background: #fff;
    color: #333;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.pagination-btn:hover {
    background: #f5f5f5;
    border-color: #0066cc;
}

.pagination-btn.active {
    background: #0066cc;
    color: #fff;
    border-color: #0066cc;
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-btn:disabled:hover {
    background: #fff;
    border-color: #ddd;
    color: #333;
}

/* Responsive Design */
@media screen and (max-width: 1024px) {
    .text-block-style-2 {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-image {
        max-height: 400px;
        overflow: hidden;
    }
    
    .text-block-style-3 {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .split-left {
        position: relative;
        top: 0;
        display: flex;
        align-items: center;
        gap: 30px;
    }
    
    .split-left h2 {
        writing-mode: horizontal-tb;
    }
    
    .specs-container {
        grid-template-columns: 1fr;
    }
    
    .advantage-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-wrapper {
        gap: 60px;
    }
}

/* Responsive - Mobile */
@media screen and (max-width: 768px) {
    .header-container {
        flex-direction: row;
        height: 70px;
        padding: 0 20px;
    }
    
    .logo {
        margin-bottom: 0;
    }
    
    .nav {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .banner-pc {
        display: none;
    }
    
    .banner-mobile {
        display: block;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-main-title,
    .timeline-header h2,
    .text-block-style-6 h2 {
        font-size: 26px;
    }
    
    .block-title {
        font-size: 24px;
    }
    
    .block-number {
        font-size: 48px;
    }
    
    .split-left h2 {
        font-size: 22px;
    }
    
    .product-item h3 {
        font-size: 18px;
    }
    
    .advantage-cards {
        grid-template-columns: 1fr;
    }
    
    .timeline-list {
        padding-left: 60px;
    }
    
    .timeline-list::before {
        left: 20px;
    }
    
    .timeline-year {
        left: -60px;
        width: 50px;
        font-size: 12px;
    }
    
    .timeline-item::before {
        left: -44px;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .contact-text h2 {
        font-size: 32px;
    }
    
    .vision-section p {
        font-size: 15px;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .video-header h2 {
        font-size: 2rem;
    }
}

/* Responsive - Small Mobile */
@media screen and (max-width: 480px) {
    .container {
        padding: 0 20px;
    }
    
    .nav-list {
        gap: 18px;
    }
    
    .nav-list a {
        font-size: 12px;
        letter-spacing: 0.5px;
    }
    
    .block-title {
        font-size: 20px;
    }
    
    .lead-text {
        font-size: 15px !important;
    }
    
    .block-content p {
        font-size: 14px;
    }
    
    .split-left {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .faq-box {
        padding: 25px 20px;
    }
    
    .contact-text h2 {
        font-size: 28px;
    }
}