/* ===================================
   武田コンサルテックワークス - Main CSS
   ConsulTech Works
   =================================== */

/* --- CSS Variables --- */
:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #475569;
    --secondary-dark: #334155;
    --accent-color: #0ea5e9;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    
    /* Grays */
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Typography */
    --font-primary: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

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

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

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: #ffffff;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

/* --- Container --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* --- Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: all var(--transition-base);
}

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

.logo {
    display: flex;
    flex-direction: column;
}

.logo-main {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.02em;
}

.logo-sub {
    font-size: 0.75rem;
    color: var(--gray-600);
    margin-top: -0.25rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-list {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--gray-700);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

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

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--gray-700);
    transition: all var(--transition-base);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
    text-align: center;
}

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

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

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

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

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-header {
    padding: 0.625rem 1.25rem;
    font-size: 0.9rem;
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #3b82f6 100%);
    color: white;
    padding-top: 80px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.1);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.hero-title {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: var(--spacing-sm);
    opacity: 0.95;
}

.hero-description {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-2xl);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
    margin-top: var(--spacing-2xl);
}

.stat-item {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-base);
}

.stat-item:hover {
    background-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

.stat-item i {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: #fbbf24;
}

.stat-item h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.stat-item p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* --- Section Styles --- */
section {
    padding: var(--spacing-2xl) 0;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
}

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

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.service-card {
    background-color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.service-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-8px);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-card.featured {
    border: 2px solid var(--primary-color);
}

.featured-badge {
    position: absolute;
    top: 15px;
    right: -25px;
    background-color: var(--warning-color);
    color: white;
    padding: 5px 30px;
    font-size: 0.75rem;
    font-weight: 700;
    transform: rotate(45deg);
    box-shadow: var(--shadow-md);
}

.service-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.service-icon i {
    font-size: 2rem;
    color: white;
}

.service-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.service-description {
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.service-features {
    margin-bottom: var(--spacing-lg);
}

.service-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--gray-700);
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
}

.service-features i {
    color: var(--success-color);
    font-size: 0.875rem;
}

/* --- CTA Section --- */
.cta-section {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: white;
    text-align: center;
}

.cta-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.cta-description {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.cta-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
    opacity: 0.9;
}

/* --- About Section --- */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.about-text h3 {
    font-size: 1.75rem;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.about-text p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-features {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.about-feature {
    display: flex;
    gap: var(--spacing-md);
    align-items: start;
    padding: var(--spacing-md);
    background-color: var(--gray-50);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.about-feature:hover {
    background-color: var(--gray-100);
    transform: translateX(5px);
}

.about-feature i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 0.25rem;
}

.about-feature h4 {
    font-size: 1.125rem;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
}

.about-feature p {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin: 0;
}

.info-card {
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 100px;
}

.info-card h3 {
    font-size: 1.5rem;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary-color);
}

.info-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.info-list li {
    display: flex;
    gap: var(--spacing-md);
    align-items: start;
}

.info-list i {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-top: 0.25rem;
}

.info-list strong {
    display: block;
    color: var(--gray-900);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.info-list span {
    color: var(--gray-600);
    font-size: 0.95rem;
    line-height: 1.6;
}

.info-list a {
    color: var(--primary-color);
    transition: color var(--transition-fast);
}

.info-list a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

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

.contact-content {
    max-width: 900px;
    margin: 0 auto;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.contact-method {
    background-color: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
}

.contact-method:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-5px);
}

.method-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.method-icon i {
    font-size: 2rem;
    color: white;
}

.contact-method h3 {
    font-size: 1.5rem;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.contact-method p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
}

.phone-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: var(--spacing-md) 0;
}

.phone-number a {
    color: var(--primary-color);
}

.phone-hours {
    font-size: 0.9rem;
    color: var(--gray-500);
}

.contact-note {
    display: flex;
    align-items: start;
    gap: var(--spacing-sm);
    background-color: #dbeafe;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

.contact-note i {
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-top: 0.125rem;
}

.contact-note p {
    color: var(--gray-700);
    margin: 0;
    line-height: 1.6;
}

/* --- Footer --- */
.footer {
    background-color: var(--gray-900);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-section h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.footer-subtitle {
    font-size: 0.875rem;
    opacity: 0.8;
    margin-bottom: var(--spacing-sm);
}

.footer-section h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    color: #fbbf24;
}

.footer-section p {
    opacity: 0.9;
    line-height: 1.7;
}

.footer-contact {
    margin-top: var(--spacing-md);
}

.footer-contact p {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}

.footer-contact i {
    color: var(--primary-light);
}

.footer-contact a {
    color: white;
    transition: color var(--transition-fast);
}

.footer-contact a:hover {
    color: var(--primary-light);
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    opacity: 0.8;
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--primary-light);
    padding-left: 5px;
}

.footer-section address {
    font-style: normal;
    opacity: 0.9;
    line-height: 1.8;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    opacity: 0.7;
    font-size: 0.875rem;
}

/* --- Scroll to Top Button --- */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

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

.scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.scroll-top i {
    font-size: 1.25rem;
}

/* --- Responsive Design --- */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .info-card {
        position: static;
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: white;
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        transition: transform var(--transition-base);
    }
    
    .nav.active {
        transform: translateY(0);
    }
    
    .nav-list {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-sm);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .btn-header {
        width: 100%;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-buttons .btn {
        width: 100%;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-title {
        font-size: 1.75rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        width: 100%;
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .cta-buttons .btn {
        width: 100%;
    }
    
    .contact-methods {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        font-size: 14px;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .scroll-top {
        width: 45px;
        height: 45px;
        bottom: 20px;
        right: 20px;
    }
}

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

.service-card,
.about-feature,
.contact-method {
    animation: fadeInUp 0.6s ease-out;
}