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

:root {
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-light: #f5f5f5;
    --color-gray: #808080;
    --color-gray-dark: #333333;
    --color-accent-gray: #d3d3d3;
    --font-primary: 'Montserrat', sans-serif;
    --font-japanese: 'Noto Sans JP', sans-serif;
    --font-logo: 'Monsieur La Doulaise', cursive;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-japanese);
    color: var(--color-black);
    background-color: var(--color-white);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

/* ========================================
   Loading Splash Screen
======================================== */
#splash-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-white);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 30px;
    z-index: 9999;
    animation: splashFadeOut 0.8s ease-in-out 2.4s forwards;
}

.splash-logo {
    font-family: var(--font-logo);
    font-size: clamp(36px, 7vw, 64px);
    font-weight: 400;
    color: var(--color-black);
    letter-spacing: 2px;
    opacity: 0;
    animation: logoFadeInOut 2.4s ease-in-out forwards;
}

.progress-bar-container {
    width: 200px;
    height: 2px;
    background-color: #e8e8e8;
    position: relative;
    overflow: hidden;
    opacity: 0;
    animation: progressContainerFade 2.4s ease-in-out forwards;
}

.progress-bar {
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background-color: #b8b8b8;
    animation: progressLoad 2.4s ease-in-out forwards;
}

@keyframes logoFadeInOut {
    0% {
        opacity: 0;
        transform: scale(0.95);
    }
    30% {
        opacity: 1;
        transform: scale(1);
    }
    70% {
        opacity: 1;
        transform: scale(1);
    }
    100% {
        opacity: 0;
        transform: scale(0.95);
    }
}

@keyframes progressContainerFade {
    0% {
        opacity: 0;
        transform: scale(0.95);
    }
    30% {
        opacity: 1;
        transform: scale(1);
    }
    70% {
        opacity: 1;
        transform: scale(1);
    }
    100% {
        opacity: 0;
        transform: scale(0.95);
    }
}

@keyframes progressLoad {
    0% {
        width: 0;
    }
    100% {
        width: 100%;
    }
}

@keyframes splashFadeOut {
    0% {
        opacity: 1;
        visibility: visible;
    }
    100% {
        opacity: 0;
        visibility: hidden;
    }
}

/* 抽象的な幾何学背景 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: 
        radial-gradient(circle at 15% 20%, rgba(40, 40, 40, 0.03) 0%, transparent 35%),
        radial-gradient(circle at 85% 25%, rgba(30, 30, 30, 0.025) 0%, transparent 40%),
        radial-gradient(circle at 70% 80%, rgba(35, 35, 35, 0.028) 0%, transparent 38%),
        radial-gradient(circle at 30% 75%, rgba(45, 45, 45, 0.022) 0%, transparent 42%),
        radial-gradient(ellipse at 50% 10%, rgba(50, 50, 50, 0.015) 0%, transparent 60%),
        radial-gradient(ellipse at 50% 90%, rgba(55, 55, 55, 0.018) 0%, transparent 55%),
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(40, 40, 40, 0.008) 2px, rgba(40, 40, 40, 0.008) 4px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(35, 35, 35, 0.008) 2px, rgba(35, 35, 35, 0.008) 4px);
    background-size: 
        1200px 1200px,
        1100px 1100px,
        1300px 1300px,
        1150px 1150px,
        100% 400px,
        100% 400px,
        4px 4px,
        4px 4px;
    background-position: 
        0 0,
        100% 0,
        100% 100%,
        0 100%,
        50% 0,
        50% 100%,
        0 0,
        0 0;
    pointer-events: none;
}

/* ========================================
   Background Canvases
======================================== */
#geometric-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    pointer-events: none;
    opacity: 0.6;
}

#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

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

/* ========================================
   Header
======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-white);
    z-index: 1000;
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

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

.logo {
    font-family: var(--font-logo);
    font-size: 28px;
    font-weight: 400;
    color: var(--color-black);
    letter-spacing: 1px;
}

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

.nav-list a {
    font-family: var(--font-primary);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-black);
    text-decoration: none;
    letter-spacing: 1px;
    transition: var(--transition);
    position: relative;
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-black);
    transition: var(--transition);
}

.nav-list a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background-color: var(--color-black);
    transition: var(--transition);
}

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

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

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

/* ========================================
   Main Content
======================================== */
.main-content {
    position: relative;
    z-index: 1;
}

/* ========================================
   Hero Section
======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    padding-top: 80px;
}

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

.hero-title {
    font-family: var(--font-primary);
    font-size: clamp(60px, 12vw, 120px);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: 5px;
    color: var(--color-black);
    margin-bottom: 30px;
}

.hero-title-line {
    display: block;
    opacity: 0;
    transform: translateY(50px);
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 24px);
    font-weight: 300;
    letter-spacing: 3px;
    color: var(--color-gray-dark);
    margin-bottom: 50px;
    opacity: 0;
}

.cta-button {
    display: inline-block;
    padding: 18px 50px;
    font-family: var(--font-primary);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-white);
    background-color: var(--color-black);
    text-decoration: none;
    letter-spacing: 2px;
    border: 2px solid var(--color-black);
    transition: var(--transition);
    opacity: 0;
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, var(--color-accent-gray), transparent);
    transition: left 0.5s;
}

.cta-button:hover {
    background-color: var(--color-white);
    color: var(--color-black);
    border-color: var(--color-accent-gray);
}

.cta-button:hover::before {
    left: 100%;
}

/* ========================================
   Services Section
======================================== */
.services {
    padding: 120px 0;
    background: transparent;
}

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

.section-header::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--color-accent-gray);
    margin: 20px auto 0;
}

.section-title {
    font-family: var(--font-primary);
    font-size: clamp(40px, 6vw, 60px);
    font-weight: 900;
    letter-spacing: 3px;
    color: var(--color-black);
    margin-bottom: 10px;
}

.section-subtitle {
    font-size: 16px;
    font-weight: 300;
    letter-spacing: 2px;
    color: var(--color-gray);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
    max-width: 1200px;
    margin: 0 auto;
}

.service-card {
    background-color: rgba(255, 255, 255, 0.9);
    padding: 50px 40px;
    border: 2px solid var(--color-accent-gray);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(30px);
    position: relative;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background-color: rgba(211, 211, 211, 0.1);
    transition: var(--transition);
    z-index: -1;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--color-gray);
}

.service-card:hover::before {
    width: 100%;
}

.service-number {
    font-family: var(--font-primary);
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--color-accent-gray);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-accent-gray);
    display: inline-block;
}

.service-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: 15px;
}

.service-description {
    font-size: 14px;
    line-height: 1.8;
    color: var(--color-gray-dark);
}

/* ========================================
   About Section
======================================== */
.about {
    padding: 120px 0;
    background: transparent;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    max-width: 1000px;
    margin: 0 auto;
}

.about-vision,
.company-info {
    background-color: rgba(255, 255, 255, 0.9);
    padding: 50px;
    border: 2px solid var(--color-accent-gray);
    transition: var(--transition);
}

.about-vision:hover,
.company-info:hover {
    border-color: var(--color-gray);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.about-heading {
    font-family: var(--font-primary);
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--color-black);
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--color-accent-gray);
}

.about-text {
    font-size: 15px;
    line-height: 2;
    color: var(--color-gray-dark);
}

.company-details {
    display: grid;
    gap: 20px;
}

.company-details dt {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--color-gray);
    margin-bottom: 5px;
}

.company-details dd {
    font-size: 15px;
    line-height: 1.8;
    color: var(--color-black);
}

/* ========================================
   Contact Section
======================================== */
.contact {
    padding: 120px 0;
    background: transparent;
}

.contact-content {
    max-width: 700px;
    margin: 0 auto;
}

.contact-form {
    background-color: rgba(255, 255, 255, 0.9);
    padding: 60px;
    border: 2px solid var(--color-accent-gray);
    transition: var(--transition);
}

.contact-form:hover {
    border-color: var(--color-gray);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.form-group {
    margin-bottom: 30px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--color-black);
    margin-bottom: 10px;
}

.required {
    color: #e74c3c;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px;
    font-family: var(--font-japanese);
    font-size: 14px;
    color: var(--color-black);
    background-color: var(--color-white);
    border: 2px solid var(--color-accent-gray);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-gray);
    background-color: rgba(211, 211, 211, 0.05);
}

.submit-button {
    width: 100%;
    padding: 18px;
    font-family: var(--font-primary);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-white);
    background-color: var(--color-black);
    border: 2px solid var(--color-black);
    letter-spacing: 2px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.submit-button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background-color: var(--color-accent-gray);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.submit-button:hover {
    background-color: var(--color-white);
    color: var(--color-black);
    border-color: var(--color-accent-gray);
}

.submit-button:hover::before {
    width: 300px;
    height: 300px;
}

/* ========================================
   Footer
======================================== */
.footer {
    position: relative;
    z-index: 10;
    padding: 40px 0;
    background-color: var(--color-black);
    color: var(--color-white);
    text-align: center;
}

.footer-text {
    font-family: var(--font-primary);
    font-size: 12px;
    letter-spacing: 1px;
}

/* ========================================
   Scroll to Top Button
======================================== */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--color-black);
    color: var(--color-white);
    border: 2px solid var(--color-accent-gray);
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.scroll-top.show {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-5px);
    background-color: var(--color-accent-gray);
    color: var(--color-black);
    border-color: var(--color-black);
}

/* ========================================
   Responsive Design
======================================== */
@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: var(--color-white);
        padding: 80px 20px 20px;
        box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
        transition: right 0.3s ease-in-out;
        z-index: 1000;
    }

    .nav.active {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        gap: 30px;
    }

    .nav-list a {
        font-size: 18px;
    }

    .hamburger {
        display: flex;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .about-vision,
    .company-info,
    .contact-form {
        padding: 30px;
    }

    .hero-title {
        letter-spacing: 2px;
    }

    .section-title {
        letter-spacing: 2px;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1025px) {
    .services-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}