/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    /* Brand Colors */
    --primary-color: #240968;
    --primary-dark: #1a0550;
    --primary-light: #3d1aa0;
    --accent-mint: #4ECDC4;
    --accent-yellow: #FFE66D;
    --accent-pink: #FF6B9D;
    
    /* Neutral Colors */
    --white: #FFFFFF;
    --black: #0A0A0A;
    --gray-100: #F8F9FA;
    --gray-200: #E9ECEF;
    --gray-300: #DEE2E6;
    --gray-400: #CED4DA;
    --gray-600: #6C757D;
    --gray-800: #343A40;
    --gray-900: #212529;
    
    /* Typography */
    --font-primary: 'Noto Sans JP', sans-serif;
    --font-secondary: 'Poppins', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Animation */
    --transition-base: 0.3s ease;
    --transition-slow: 0.6s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(36, 9, 104, 0.15);
    --shadow-xl: 0 20px 60px rgba(36, 9, 104, 0.25);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--gray-900);
    background-color: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-base);
}

ul {
    list-style: none;
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

.desktop-only {
    display: none;
}

@media (min-width: 768px) {
    .desktop-only {
        display: inline;
    }
}

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

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

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
}

.logo a {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.logo-text {
    font-family: var(--font-secondary);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: -0.02em;
}

.logo-sub {
    font-size: 0.65rem;
    font-weight: 400;
    color: var(--gray-600);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.nav {
    display: none;
}

@media (min-width: 768px) {
    .nav {
        display: block;
    }
}

.nav-list {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    font-weight: 500;
    color: var(--gray-800);
    position: relative;
}

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

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

.btn-header {
    display: none;
}

@media (min-width: 768px) {
    .btn-header {
        display: inline-flex;
    }
}

.mobile-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

@media (min-width: 768px) {
    .mobile-toggle {
        display: none;
    }
}

.mobile-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: var(--transition-base);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-service {
    background: var(--gray-100);
    color: var(--primary-color);
    width: 100%;
    justify-content: center;
    margin-top: 1rem;
}

.btn-service:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

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

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 50%, var(--accent-mint) 100%);
    opacity: 0.05;
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-yellow) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

.hero-background::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-pink) 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
    opacity: 0.3;
    animation: float 15s infinite ease-in-out reverse;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    25% {
        transform: translate(30px, -30px) rotate(5deg);
    }
    50% {
        transform: translate(-20px, 20px) rotate(-5deg);
    }
    75% {
        transform: translate(20px, 30px) rotate(3deg);
    }
}

.hero-content {
    text-align: center;
    max-width: 900px;
    animation: fadeInUp 1s ease-out;
    margin: 0 auto;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.hero-title-main {
    font-family: var(--font-primary);
    font-size: 2rem;
    font-weight: 900;
    color: var(--primary-color);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

@media (min-width: 768px) {
    .hero-title-main {
        font-size: 3.5rem;
    }
}

.hero-title-sub {
    font-family: var(--font-secondary);
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--gray-600);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

@media (min-width: 768px) {
    .hero-title-sub {
        font-size: 1.1rem;
    }
}

.hero-description {
    font-size: 1rem;
    color: var(--gray-700);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

@media (min-width: 768px) {
    .hero-description {
        font-size: 1.15rem;
    }
}

.hero-cta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

@media (min-width: 768px) {
    .hero-cta {
        flex-direction: row;
        justify-content: center;
        gap: var(--spacing-md);
    }
}

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--gray-600);
    font-size: 0.85rem;
    animation: bounce 2s infinite;
}

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

.hero-scroll-line {
    width: 2px;
    height: 40px;
    background: linear-gradient(to bottom, var(--gray-400), transparent);
}

/* ========================================
   Services Section
   ======================================== */
.services {
    padding: var(--spacing-xl) 0;
    background: var(--gray-100);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-family: var(--font-secondary);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

@media (min-width: 768px) {
    .section-title {
        font-size: 3rem;
    }
}

.section-description {
    font-size: 1rem;
    color: var(--gray-600);
}

@media (min-width: 768px) {
    .section-description {
        font-size: 1.1rem;
    }
}

.services-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

@media (min-width: 768px) {
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-md);
    }
}

.service-card {
    background: var(--white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-slow);
    opacity: 0;
    transform: translateY(30px);
}

.service-card.aos-animate {
    opacity: 1;
    transform: translateY(0);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.service-image {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.service-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.service-overlay {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
}

.service-tag {
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-color);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.service-content {
    padding: var(--spacing-md);
}

.service-name {
    font-family: var(--font-secondary);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.service-concept {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-mint);
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
}

.service-description {
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: var(--white);
}

.contact-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.contact-title {
    font-family: var(--font-secondary);
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
}

@media (min-width: 768px) {
    .contact-title {
        font-size: 3rem;
    }
}

.contact-description {
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
    opacity: 0.95;
}

@media (min-width: 768px) {
    .contact-description {
        font-size: 1.1rem;
    }
}

.contact-action .btn-primary {
    background: var(--white);
    color: var(--primary-color);
}

.contact-action .btn-primary:hover {
    background: var(--accent-mint);
    color: var(--white);
    transform: translateY(-5px);
}

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

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.footer-main {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .footer-main {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

.footer-logo {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    margin-bottom: var(--spacing-sm);
}

.footer-logo .logo-text {
    color: var(--white);
    font-size: 1.75rem;
}

.footer-logo .logo-sub {
    color: var(--gray-400);
}

.footer-tagline {
    font-size: 0.95rem;
    color: var(--gray-400);
}

.footer-column h4 {
    color: var(--white);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-column a {
    color: var(--gray-400);
    font-size: 0.95rem;
}

.footer-column a:hover {
    color: var(--accent-mint);
}

.footer-social h4 {
    color: var(--white);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-800);
    border-radius: 50%;
    color: var(--gray-300);
    transition: var(--transition-base);
}

.social-link:hover {
    background: var(--accent-mint);
    color: var(--white);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray-800);
}

.footer-bottom p {
    font-size: 0.9rem;
    color: var(--gray-500);
}

/* ========================================
   Back to Top Button
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

/* ========================================
   Animation Utilities
   ======================================== */
[data-aos] {
    transition-duration: 0.8s;
}

[data-aos="fade-up"] {
    opacity: 0;
    transform: translateY(30px);
}

[data-aos="fade-up"].aos-animate {
    opacity: 1;
    transform: translateY(0);
}