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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: #333;
    background-color: #ffffff;
    overflow-x: hidden;
}

/* SVG Icons */
.icon {
    display: inline-block;
    width: 1em;
    height: 1em;
    fill: currentColor;
    vertical-align: -0.125em;
}

.icon-sm { width: 0.875em; height: 0.875em; }
.icon-lg { width: 1.25em; height: 1.25em; }
.icon-xl { width: 1.5em; height: 1.5em; }

/* Core Web Vitals Optimization */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Prevent layout shift for images */
.service__image img,
.achievement__image img {
    aspect-ratio: 16/9;
    object-fit: cover;
    width: 100%;
}

/* Lightweight Animation System (AOS replacement) */
[data-animate] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].animate-in {
    opacity: 1;
    transform: translateY(0);
}

[data-animate="fade-up"] {
    transform: translateY(30px);
}

[data-animate="fade-right"] {
    transform: translateX(-30px);
}

[data-animate="fade-left"] {
    transform: translateX(30px);
}

[data-animate="fade-up"].animate-in,
[data-animate="fade-right"].animate-in,
[data-animate="fade-left"].animate-in {
    transform: translate(0, 0);
}

/* CSS Variables */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-light: #3b82f6;
    --color-primary-dark: #1d4ed8;
    --color-secondary: #f8fafc;
    --color-accent: #06b6d4;
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;
    
    /* Mobile Performance */
    --touch-target-min: 44px; /* WCAG AAA minimum touch target */
    
    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    --spacing-24: 6rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Container */
    --container-max-width: 1200px;
    --container-padding: var(--spacing-4);
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Section */
.section {
    padding: var(--spacing-24) 0;
}

.section:first-of-type {
    padding-top: var(--spacing-20);
}

/* Section Header */
.section__header {
    text-align: center;
    margin-bottom: var(--spacing-16);
}

.section__subtitle {
    display: inline-block;
    padding: var(--spacing-2) var(--spacing-4);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-4);
}

.section__title {
    font-size: var(--font-size-4xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-6);
    line-height: 1.1;
    letter-spacing: -0.5px;
}

.section__description {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: var(--transition);
}

.btn:hover::before {
    left: 100%;
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn--primary:hover {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn--secondary {
    background: var(--color-white);
    color: var(--color-primary);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.btn--secondary:hover {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn--large {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-lg);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.header.scroll-header {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

/* Navigation */
.nav {
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-width: 0;
}

.nav__data {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}

.nav__logo-icon {
    font-size: var(--font-size-xl);
    color: var(--color-primary);
}

.nav__logo-text {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.nav__toggle {
    display: none;
    font-size: var(--font-size-xl);
    color: var(--color-primary);
    cursor: pointer;
    background: transparent;
    border: 0;
}

.nav__menu {
    display: flex;
    align-items: center;
}

.nav__list {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    list-style: none;
    flex-wrap: nowrap;
}

.nav__link {
    font-weight: 400;
    color: var(--color-gray-700);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    font-size: var(--font-size-base);
    white-space: nowrap;
}

.nav__link:hover {
    color: var(--color-primary);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition);
    transform: translateX(-50%);
}

.nav__link:hover::after {
    width: 100%;
}

/* Active nav link state */
.nav__link.active-link {
    color: var(--color-primary);
}
.nav__link.active-link::after {
    width: 100%;
}

.nav__cta {
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-md);
    border: 2px solid var(--color-primary);
}

.nav__cta:hover {
    background: var(--color-white);
    color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.nav__cta::after {
    display: none;
}

.nav__close {
    display: none;
    background: transparent;
    border: 0;
}

/* Hero Section */
.hero {
    padding-top: 9rem;
    padding-bottom: var(--spacing-20);
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, 
        var(--color-gray-50) 0%, 
        var(--color-white) 50%, 
        var(--color-gray-50) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%232563eb' fill-opacity='0.03'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
    z-index: 0;
    animation: float-pattern 20s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at center, 
        rgba(37, 99, 235, 0.1) 0%, 
        rgba(37, 99, 235, 0.05) 30%, 
        transparent 70%);
    z-index: 0;
    animation: pulse-glow 8s ease-in-out infinite;
}

.hero__container {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero__content {
    max-width: 800px;
    text-align: center;
}


.hero__title {
    font-size: var(--font-size-5xl);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-6);
}

.hero__title-accent {
    color: var(--color-primary);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__description {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-8);
    line-height: 1.8;
}

.hero__buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

.hero__image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero__illustration {
    position: relative;
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-xl);
}

.hero__icon {
    font-size: 8rem;
    color: var(--color-white);
    animation: float 3s ease-in-out infinite;
}

.hero__particles {
    position: absolute;
    inset: 0;
}

.particle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--color-white);
    border-radius: var(--radius-full);
    opacity: 0.7;
    animation: particle 4s linear infinite;
}

.particle:nth-child(1) {
    top: 20%;
    left: 20%;
    animation-delay: 0s;
}

.particle:nth-child(2) {
    top: 60%;
    right: 20%;
    animation-delay: 1s;
}

.particle:nth-child(3) {
    bottom: 20%;
    left: 50%;
    animation-delay: 2s;
}

/* Scroll Down Indicator (simple) */
.scroll-indicator {
    position: absolute;
    left: 50%;
    bottom: 2rem;
    transform: translateX(-50%);
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    z-index: 10;
    user-select: none;
}

.scroll-indicator__chevron {
    width: 18px;
    height: 18px;
    border-right: 2px solid rgba(30, 41, 59, 0.9);
    border-bottom: 2px solid rgba(30, 41, 59, 0.9);
    transform: rotate(45deg);
}

.scroll-indicator__chevrons {
    display: grid;
    grid-auto-rows: min-content;
}

/* 下側（2個目）の矢印だけ上に2px詰める */
.scroll-indicator__chevrons .scroll-indicator__chevron + .scroll-indicator__chevron {
    margin-top: -4px;
}

.scroll-indicator__label {
    font-size: var(--font-size-xs);
    color: rgba(30, 41, 59, 0.6);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* About Section */
.about {
    background: var(--color-white);
}

.about__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-12);
    align-items: start;
}

.about__data {
    max-width: 100%;
}

.about__subtitle {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-4);
}

.about__description {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-4);
    line-height: 1.8;
}

.about__info {
    background: var(--color-gray-50);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.company__info-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-6);
    text-align: center;
}

.company__details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.detail__item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3);
    background: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.detail__item i {
    font-size: var(--font-size-lg);
    color: var(--color-primary);
    min-width: 24px;
}

.detail__item div {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.detail__label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-gray-500);
}

.detail__value {
    font-size: var(--font-size-base);
    color: var(--color-gray-900);
    font-weight: 400;
}

/* Services Section */
.services {
    background: var(--color-gray-50);
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-8);
}

.service__card {
    background: var(--color-white);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-gray-200);
    position: relative;
    overflow: hidden;
}

.service__card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.service__card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--color-primary);
}

.service__card:hover::before {
    transform: scaleX(1);
}

.service__image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-6);
    background: linear-gradient(135deg, var(--color-gray-100), var(--color-gray-200));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.service__image::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 64px;
    height: 64px;
    background: var(--color-primary);
    border-radius: var(--radius-xl);
    opacity: 0.1;
}

.service__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.service__card:hover .service__image img {
    transform: scale(1.05);
}

.service__icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-6);
}

.service__icon i {
    font-size: var(--font-size-2xl);
    color: var(--color-white);
}

.service__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-3);
    line-height: 1.3;
}

.service__description {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-6);
    line-height: 1.7;
}

.service__features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.service__features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--color-gray-700);
    font-size: var(--font-size-sm);
}

.service__features i {
    color: var(--color-primary);
    font-size: var(--font-size-sm);
}

/* Achievements Section */
.achievements {
    background: var(--color-white);
}

.achievements__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-8);
}

.achievement__card {
    background: var(--color-white);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-gray-200);
    position: relative;
    overflow: hidden;
}

.achievement__card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-primary));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.achievement__card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--color-accent);
}

.achievement__card:hover::before {
    transform: scaleX(1);
}

.achievement__header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-4);
}

.achievement__icon {
    font-size: var(--font-size-xl);
    color: var(--color-primary);
}

.achievement__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-gray-900);
    line-height: 1.3;
}

.achievement__description {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-4);
    line-height: 1.7;
}

.achievement__list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.achievement__list li {
    color: var(--color-gray-700);
    font-size: var(--font-size-sm);
    padding-left: var(--spacing-4);
    position: relative;
}

.achievement__list li::before {
    content: '•';
    color: var(--color-primary);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* Contact Section */
.contact {
    background: var(--color-gray-50);
}

.contact__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-12);
    align-items: start;
}

.contact__subtitle {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-4);
}

.contact__description {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-8);
    line-height: 1.8;
}

.contact__methods {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.contact__method {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-4);
}

.contact__method i {
    font-size: var(--font-size-xl);
    color: var(--color-primary);
    margin-top: var(--spacing-1);
}

.contact__method h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-1);
}

.contact__method p {
    color: var(--color-gray-600);
}

.contact__form-container {
    background: var(--color-white);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.contact__cta {
    text-align: center;
}

.contact__cta-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-3);
}

.contact__cta-description {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-8);
    line-height: 1.8;
}

.contact__btn {
    margin-bottom: var(--spacing-4);
    width: 100%;
    justify-content: center;
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-lg);
}

.contact__email-info {
    text-align: center;
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--color-gray-200);
}

.email__address {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-2);
}

.email__note {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

/* Footer */
.footer {
    background: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--spacing-20) 0 var(--spacing-8) 0;
}

.footer__content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-12);
}

.footer__section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.footer__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-2);
}

.footer__logo-icon {
    font-size: var(--font-size-xl);
    color: var(--color-primary);
}

.footer__logo-text {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-white);
}

.footer__description {
    color: var(--color-gray-400);
    line-height: 1.7;
}

.footer__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-2);
}

.footer__links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.footer__links a {
    color: var(--color-gray-400);
    text-decoration: none;
    transition: var(--transition);
}

.footer__links a:hover {
    color: var(--color-primary);
}

.footer__contact {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.footer__contact p {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-2);
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.footer__contact i {
    color: var(--color-primary);
    width: 16px;
    margin-top: 2px;
    flex-shrink: 0;
}

.footer__bottom {
    border-top: 1px solid var(--color-gray-700);
    padding-top: var(--spacing-6);
    text-align: center;
}

.footer__copyright {
    color: var(--color-gray-500);
}

/* Scroll Up Button */
.scrollup {
    position: fixed;
    right: var(--spacing-6);
    bottom: var(--spacing-6);
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.scrollup:hover {
    background: var(--color-primary-dark);
    transform: translateY(-4px);
}

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

/* AOS Custom Animation Overrides */
[data-aos] {
    transition-property: transform, opacity !important;
}

[data-aos][data-aos-duration="250"] {
    transition-duration: 0.4s, 0.8s !important;
}

/* Specific overrides for different AOS animations */
[data-aos="fade-up"],
[data-aos="fade-left"],
[data-aos="fade-right"],
[data-aos="fade-down"] {
    transition: transform 0.4s ease-in-out, opacity 0.8s ease-in-out !important;
}

/* Animations */
@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes particle {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
        opacity: 0.7;
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
        opacity: 0.3;
    }
}

@keyframes float-pattern {
    0%, 100% {
        transform: translateX(0) translateY(0);
    }
    25% {
        transform: translateX(10px) translateY(-5px);
    }
    50% {
        transform: translateX(-5px) translateY(-10px);
    }
    75% {
        transform: translateX(-10px) translateY(5px);
    }
}

@keyframes pulse-glow {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.05);
    }
}

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

@keyframes scroll-wheel {
    0% {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
    50% {
        transform: translateX(-50%) translateY(12px);
        opacity: 0.3;
    }
    100% {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
}

/* モーション削除に伴い keyframes は未使用 */

/* Responsive Design */
@media screen and (max-width: 1024px) {
    :root {
        --container-padding: var(--spacing-6);
    }
    
    .hero__container {
        flex-direction: column;
        gap: var(--spacing-8);
    }
    
    .about__content {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
    }
    
    .contact__content {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
    }
    
    .services__grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: var(--spacing-6);
    }
    
    .achievements__grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media screen and (max-width: 768px) {
    /* Mobile touch target optimization */
    .btn,
    .nav__link,
    .nav__toggle,
    .nav__close,
    .scrollup {
        min-height: var(--touch-target-min);
        min-width: var(--touch-target-min);
    }
    
    .nav__toggle,
    .nav__close {
        padding: var(--spacing-3);
    }
    
    .hero::after {
        display: none;
    }
    
    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 85%;
        height: 100vh;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        padding: var(--spacing-8) var(--spacing-6);
        transition: var(--transition);
        box-shadow: var(--shadow-xl);
    }
    
    .nav__menu.show-menu {
        right: 0;
    }
    
    .nav__list {
        flex-direction: column;
        gap: var(--spacing-6);
        padding-top: var(--spacing-8);
    }
    
    .nav__close {
        display: block;
        position: absolute;
        top: var(--spacing-4);
        right: var(--spacing-4);
        font-size: var(--font-size-xl);
        color: var(--color-primary);
        cursor: pointer;
    }
    
    .nav__toggle {
        display: block;
    }
    
    .hero {
        padding-top: 6rem;
        padding-bottom: var(--spacing-16);
    }
    
    .hero__title {
        font-size: var(--font-size-4xl);
    }
    
    .hero__buttons {
        justify-content: center;
    }
    
    .hero__illustration {
        width: 250px;
        height: 250px;
    }
    
    .hero__icon {
        font-size: 6rem;
    }
    
    .section {
        padding: var(--spacing-16) 0;
    }
    
    .section__title {
        font-size: var(--font-size-3xl);
    }
    
    .services__grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
    }
    
    .achievements__grid {
        grid-template-columns: 1fr;
    }
    
    .footer__content {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
        text-align: center;
    }
    
    .footer__contact p {
        text-align: left;
        justify-content: center;
    }
}

@media screen and (max-width: 480px) {
    :root {
        --container-padding: var(--spacing-4);
    }
    
    .nav__logo-text {
        display: none;
    }
    
    .hero__title {
        font-size: var(--font-size-3xl);
    }
    
    .hero__buttons {
        flex-direction: column;
    }
    
    .hero__illustration {
        width: 200px;
        height: 200px;
    }
    
    .hero__icon {
        font-size: 4rem;
    }
    
    .section__title {
        font-size: var(--font-size-2xl);
    }
    
    .about__subtitle,
    .contact__subtitle,
    .contact__cta-title {
        font-size: var(--font-size-xl);
    }
    
    .service__card,
    .achievement__card,
    .about__info,
    .contact__form-container {
        padding: var(--spacing-6);
    }
    
    .scrollup {
        right: var(--spacing-4);
        bottom: var(--spacing-4);
        width: 40px;
        height: 40px;
    }
    
    .scroll-indicator {
        bottom: 1.5rem;
        width: 28px;
        height: 28px;
    }
    .scroll-indicator__chevron {
        width: 12px;
        height: 12px;
    }
}

/* Print Styles */
@media print {
    .header,
    .nav__toggle,
    .scrollup {
        display: none;
    }
    
    .hero {
        padding-top: 0;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* Skip link */
.skip-link {
    position: absolute;
    left: -999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}
.skip-link:focus,
.skip-link:focus-visible {
    left: 1rem;
    top: 1rem;
    width: auto;
    height: auto;
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--color-primary);
    color: var(--color-white);
    z-index: 1001;
    border-radius: var(--radius-md);
}

/* Focus visibility for interactive elements */
.btn:focus-visible,
.nav__link:focus-visible,
.nav__toggle:focus-visible,
.nav__close:focus-visible,
button:focus-visible,
a:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* Button ripple effect (used by scripts/main.js) */
.btn {
    position: relative;
    overflow: hidden;
}
.btn .ripple {
    position: absolute;
    border-radius: 50%;
    transform: scale(0);
    background: rgba(255,255,255,0.5);
    animation: ripple 600ms ease-out;
    pointer-events: none;
}
@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}