/* --- 0. 基础设定 --- */
:root {
    --black: #1a1a1a;
    --white: #ffffff;
    --accent: #FF6B00;
    --gray: #888888;
    --font-en: 'Montserrat', sans-serif;
    --font-jp: 'Noto Sans JP', sans-serif;
}

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

body { 
    font-family: var(--font-jp); 
    color: var(--black); 
    background-color: var(--white); 
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: 0.4s cubic-bezier(0.165, 0.84, 0.44, 1); }
ul { list-style: none; }
img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* --- 1. 导航栏 --- */
header { 
    position: fixed; top: 0; left: 0; width: 100%; 
    padding: 30px 50px; 
    display: flex; justify-content: space-between; align-items: center; 
    z-index: 100; 
    background: linear-gradient(to bottom, rgba(255,255,255,0.8), transparent);
    backdrop-filter: blur(2px);
}

.logo { 
    font-family: var(--font-en); 
    font-weight: 800; 
    font-size: 1.5rem; 
    letter-spacing: 0.2em; 
    text-transform: uppercase;
}

.nav-list { display: flex; gap: 40px; }
.nav-list a { 
    font-family: var(--font-en); 
    font-size: 0.85rem; 
    letter-spacing: 0.1em; 
    font-weight: 400;
    position: relative;
}

.nav-list a::after {
    content: ''; position: absolute; left: 0; bottom: -5px; width: 0; height: 1px; background: var(--black); transition: 0.3s;
}
.nav-list a:hover::after { width: 100%; }

/* --- 2. HERO SECTION --- */
.hero { 
    height: 100vh; 
    width: 100%; 
    position: relative; 
    display: flex;
    overflow: hidden;
}

.hero-split {
    width: 50%;
    height: 100%;
    position: relative;
    transition: 1s ease;
}

.hero-split::after {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.1); 
}

.hero-text-layer {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
    text-align: center;
    width: 100%;
    mix-blend-mode: exclusion;
    color: #fff;
    pointer-events: none;
}

.hero-title {
    font-family: var(--font-en);
    font-weight: 800;
    font-size: 6vw;
    line-height: 0.9;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 1.2rem;
    letter-spacing: 0.5em;
    font-weight: 300;
    margin-bottom: 30px;
}

.scroll-indicator {
    position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
    font-family: var(--font-en); font-size: 0.8rem; letter-spacing: 0.2em;
    animation: bounce 2s infinite;
    z-index: 20;
}
@keyframes bounce { 0%, 100% {transform: translate(-50%, 0);} 50% {transform: translate(-50%, 10px);} }

/* --- 3. 理念 --- */
.section { padding: 120px 10%; position: relative; }

.bg-text {
    position: absolute; top: 50px; left: -50px;
    font-family: var(--font-en); font-weight: 800; font-size: 15rem;
    color: rgba(0,0,0,0.03);
    z-index: -1;
    line-height: 1;
    pointer-events: none;
}

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

.section-header { margin-bottom: 40px; }
.section-tag { 
    color: var(--accent); font-family: var(--font-en); font-weight: 700; 
    font-size: 0.9rem; letter-spacing: 0.2em; display: block; margin-bottom: 20px;
    display: flex; align-items: center; gap: 10px;
}
.section-tag::before { content: ''; width: 40px; height: 1px; background: var(--accent); }

.section-title { 
    font-size: 2.5rem; font-weight: 700; line-height: 1.4; margin-bottom: 30px; 
    font-feature-settings: "palt";
}

.text-body { line-height: 2; color: #555; text-align: justify; }

/* --- 4. 业务板块 --- */
.service-container { margin-top: 100px; }

.service-row {
    display: flex; margin-bottom: 150px; align-items: center;
    position: relative;
}

.service-row:nth-child(even) { flex-direction: row-reverse; }

.service-visual {
    flex: 1.2;
    height: 600px;
    position: relative;
    overflow: hidden;
}

.service-visual img { 
    transition: transform 1.2s cubic-bezier(0.19, 1, 0.22, 1); 
}
.service-row:hover .service-visual img { transform: scale(1.05); }

.service-info {
    flex: 0.8;
    padding: 60px;
    background: #fff;
    margin-left: -100px; 
    z-index: 2;
    box-shadow: 0 20px 50px rgba(0,0,0,0.05);
}

.service-row:nth-child(even) .service-info {
    margin-left: 0; margin-right: -100px;
}

.service-num {
    font-family: var(--font-en); font-size: 4rem; font-weight: 200; color: #eee;
    position: absolute; top: -40px; right: 40px;
}

/* --- 5. 优势 --- */
.strength-section { background: #f9f9f9; text-align: center; }

.strength-list {
    display: flex; justify-content: space-between; gap: 40px; margin-top: 60px;
}

.strength-item {
    flex: 1; padding: 40px 20px; border: 1px solid transparent; transition: 0.3s;
}
.strength-item:hover { border-color: #ddd; background: #fff; }

.strength-icon { font-size: 2rem; margin-bottom: 20px; display: block; }
.strength-title { font-family: var(--font-en); font-weight: 700; font-size: 1.2rem; margin-bottom: 15px; }
.strength-desc { font-size: 0.9rem; color: #666; }

/* --- 6. 公司信息 --- */
.company-wrapper { max-width: 800px; margin: 0 auto; }
.info-row { 
    display: flex; padding: 25px 0; border-bottom: 1px solid #eee; 
    transition: 0.3s;
}
.info-row:hover { padding-left: 10px; border-color: var(--accent); }

.info-label { width: 30%; font-weight: 700; font-size: 0.9rem; letter-spacing: 0.1em; color: var(--black); }
.info-value { width: 70%; color: #555; }

/* --- 7. 页脚 --- */
footer { 
    background: var(--black); color: var(--white); 
    padding: 100px 10% 50px; 
}
.footer-content { 
    display: flex; justify-content: space-between; align-items: flex-end; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 50px; margin-bottom: 30px;
}
.footer-cta h2 { font-size: 3rem; font-family: var(--font-en); margin-bottom: 20px; }
.footer-btn { 
    display: inline-block; padding: 15px 50px; background: var(--white); color: var(--black); 
    font-family: var(--font-en); font-weight: 700; 
}
.footer-contact p { opacity: 0.6; margin-bottom: 5px; font-family: var(--font-en); }
.copyright { font-size: 0.7rem; opacity: 0.3; text-align: center; font-family: var(--font-en); }

/* --- 移动端适配 --- */
@media (max-width: 768px) {
    .hero { flex-direction: column; }
    .hero-split { width: 100%; height: 50%; }
    .hero-title { font-size: 3rem; }
    .about-grid { grid-template-columns: 1fr; }
    .service-row, .service-row:nth-child(even) { flex-direction: column; margin-bottom: 80px; }
    .service-visual { width: 100%; height: 300px; }
    .service-info, .service-row:nth-child(even) .service-info { margin: -50px 20px 0; width: auto; box-shadow: 0 10px 30px rgba(0,0,0,0.1); }
    .strength-list { flex-direction: column; }
    .footer-content { flex-direction: column; align-items: flex-start; gap: 40px; }
    .nav-list { display: none; }
}