/* ==========================================
   Reset & Base Styles
   ========================================== */

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

:root {
    /* Brand Colors */
    --primary-green: #2D5F5D;
    --accent-teal: #4A9B99;
    --accent-blue: #5DB8C8;
    --light-green: #E8F3F1;
    
    /* Neutral Colors */
    --text-primary: #2C3E3C;
    --text-secondary: #5A6B69;
    --text-light: #8A9B99;
    --bg-white: #FFFFFF;
    --bg-light: #F8FAFA;
    --border-color: #D8E3E1;
    
    /* Typography */
    --font-sans: 'Noto Sans JP', sans-serif;
    --font-serif: 'Noto Serif JP', serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --spacing-xxl: 8rem;
    
    /* Container */
    --container-width: 1120px;
    --container-narrow: 800px;
}

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

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg-white);
    line-height: 1.8;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

a:hover {
    opacity: 0.7;
}

/* ==========================================
   Layout Components
   ========================================== */

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: var(--spacing-xl) 0;
}

/* ==========================================
   Header
   ========================================== */

.header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.header-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
    font-size: 1.125rem;
    letter-spacing: 0.05em;
}

.logo-text {
    color: var(--primary-green);
}

.nav {
    display: flex;
    gap: 2.5rem;
}

.nav-link {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    position: relative;
    padding: 0.25rem 0;
    font-weight: 400;
}

.nav-link.active {
    color: var(--primary-green);
    font-weight: 500;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--primary-green);
    transition: width 0.3s ease;
}

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

/* ==========================================
   Hero Section
   ========================================== */

.hero {
    min-height: 70vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #F8FAFA 0%, #E8F3F1 100%);
    padding: var(--spacing-xxl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(77, 155, 153, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease;
}

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

.hero-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 500;
    line-height: 1.6;
    color: var(--primary-green);
    margin-bottom: 2rem;
    letter-spacing: 0.02em;
}

.hero-subtitle {
    font-size: 1.0625rem;
    line-height: 2;
    color: var(--text-secondary);
    max-width: 700px;
    font-weight: 300;
}

/* ==========================================
   Section Components
   ========================================== */

.section-title {
    font-size: 1.75rem;
    font-weight: 500;
    color: var(--primary-green);
    margin-bottom: 2.5rem;
    letter-spacing: 0.05em;
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 2px;
    background-color: var(--accent-teal);
}

.section-intro {
    font-size: 1.0625rem;
    line-height: 2;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

/* ==========================================
   About Section
   ========================================== */

.about-section {
    background-color: var(--bg-white);
}

.about-content {
    max-width: var(--container-narrow);
}

.about-content p {
    margin-bottom: 1.75rem;
    line-height: 2;
    color: var(--text-secondary);
}

.about-content p:last-child {
    margin-bottom: 0;
}

/* ==========================================
   Features Section
   ========================================== */

.features-section {
    background-color: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    max-width: var(--container-width);
}

.feature-card {
    padding: 2.5rem 2rem;
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(45, 95, 93, 0.08);
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--primary-green);
    margin-bottom: 1.25rem;
    letter-spacing: 0.03em;
}

.feature-text {
    font-size: 0.9375rem;
    line-height: 1.9;
    color: var(--text-secondary);
}

/* ==========================================
   Link Sections
   ========================================== */

.link-section {
    background-color: var(--bg-white);
    text-align: center;
}

.link-content {
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.link-description {
    font-size: 1.0625rem;
    line-height: 2;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.btn-link {
    display: inline-block;
    padding: 1rem 3rem;
    background-color: var(--primary-green);
    color: white;
    font-size: 0.9375rem;
    font-weight: 500;
    border: 1px solid var(--primary-green);
    transition: all 0.3s ease;
    letter-spacing: 0.05em;
}

.btn-link:hover {
    background-color: transparent;
    color: var(--primary-green);
    opacity: 1;
}

/* ==========================================
   Works Preview Section
   ========================================== */

.works-preview-section {
    background-color: var(--bg-light);
}

.work-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    max-width: 700px;
    margin: 0 auto;
}

.work-title {
    font-size: 1.375rem;
    font-weight: 500;
    color: var(--primary-green);
    margin-bottom: 2rem;
    letter-spacing: 0.02em;
}

.work-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.work-detail-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.work-label {
    font-size: 0.8125rem;
    color: var(--text-light);
    letter-spacing: 0.05em;
}

.work-value {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

.work-comment {
    font-size: 0.9375rem;
    line-height: 1.9;
    color: var(--text-secondary);
}

/* ==========================================
   Contact Link Section
   ========================================== */

.contact-link-section {
    background-color: var(--bg-white);
    text-align: center;
}

.contact-link-content {
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.contact-description {
    font-size: 1.0625rem;
    line-height: 2;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.contact-tel {
    font-size: 1.25rem;
    color: var(--primary-green);
    font-weight: 500;
    letter-spacing: 0.05em;
}

/* ==========================================
   Footer
   ========================================== */

.footer {
    background-color: var(--primary-green);
    color: white;
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-name {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: 1rem;
    letter-spacing: 0.05em;
}

.footer-tagline {
    font-size: 0.8125rem;
    line-height: 1.8;
    opacity: 0.85;
    font-weight: 300;
}

.footer-address,
.footer-contact {
    font-size: 0.875rem;
    line-height: 1.8;
    opacity: 0.9;
    font-weight: 300;
}

.footer-address {
    margin-bottom: 1rem;
}

.footer-copyright {
    text-align: center;
    font-size: 0.8125rem;
    opacity: 0.7;
    font-weight: 300;
}

/* ==========================================
   Page Header (下層ページ用)
   ========================================== */

.page-header {
    background-color: var(--bg-light);
    padding: 4rem 0 3rem;
    border-bottom: 1px solid var(--border-color);
}

.page-title {
    font-size: 2rem;
    font-weight: 500;
    color: var(--primary-green);
    letter-spacing: 0.05em;
    text-align: center;
}

/* ==========================================
   Business Page
   ========================================== */

.business-intro {
    max-width: var(--container-narrow);
    margin: 0 auto;
    text-align: center;
}

.business-lead {
    font-size: 1.125rem;
    line-height: 2;
    color: var(--text-secondary);
}

.business-detail-section {
    background-color: var(--bg-white);
}

.business-detail {
    max-width: var(--container-narrow);
    margin: 0 auto 5rem;
    position: relative;
    padding-left: 5rem;
}

.business-detail:last-child {
    margin-bottom: 0;
}

.business-number {
    position: absolute;
    left: 0;
    top: 0;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--accent-teal);
    border: 2px solid var(--accent-teal);
    border-radius: 50%;
}

.business-detail-title {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--primary-green);
    margin-bottom: 1.5rem;
    letter-spacing: 0.03em;
}

.business-detail-content p {
    font-size: 0.9375rem;
    line-height: 2;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
}

.business-detail-content p:last-child {
    margin-bottom: 0;
}

/* ==========================================
   Works Page
   ========================================== */

.works-list-section {
    background-color: var(--bg-white);
}

.works-list-section .work-card {
    margin-bottom: 3rem;
    max-width: 800px;
}

.works-list-section .work-card:last-child {
    margin-bottom: 0;
}

/* ==========================================
   Company Page
   ========================================== */

.company-info-section {
    background-color: var(--bg-white);
}

.company-table {
    width: 100%;
    max-width: var(--container-narrow);
    margin: 0 auto;
    border-collapse: collapse;
}

.company-table tr {
    border-bottom: 1px solid var(--border-color);
}

.company-table th,
.company-table td {
    padding: 1.5rem 1rem;
    text-align: left;
    font-size: 0.9375rem;
    line-height: 1.8;
}

.company-table th {
    width: 180px;
    font-weight: 500;
    color: var(--primary-green);
    vertical-align: top;
}

.company-table td {
    color: var(--text-secondary);
}

.message-section {
    background-color: var(--bg-light);
}

.message-content {
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.message-content p {
    font-size: 1rem;
    line-height: 2;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.message-signature {
    text-align: right;
    font-weight: 500;
    color: var(--primary-green);
    margin-top: 2.5rem;
}

/* ==========================================
   Contact Page
   ========================================== */

.contact-form-section {
    background-color: var(--bg-white);
}

.form-container {
    max-width: var(--container-narrow);
    margin: 0 auto 4rem;
}

.form-group {
    margin-bottom: 2rem;
}

.form-label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--primary-green);
    margin-bottom: 0.75rem;
}

.required {
    font-size: 0.75rem;
    color: white;
    background-color: var(--accent-teal);
    padding: 0.2rem 0.5rem;
    margin-left: 0.5rem;
    border-radius: 2px;
    font-weight: 400;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: var(--font-sans);
    border: 1px solid var(--border-color);
    background-color: var(--bg-white);
    transition: border-color 0.3s ease;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent-teal);
}

.form-textarea {
    resize: vertical;
    line-height: 1.8;
}

.form-submit {
    text-align: center;
    margin-top: 3rem;
}

.btn-submit {
    padding: 1rem 4rem;
    background-color: var(--primary-green);
    color: white;
    font-size: 1rem;
    font-weight: 500;
    border: 1px solid var(--primary-green);
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 0.05em;
    font-family: var(--font-sans);
}

.btn-submit:hover {
    background-color: transparent;
    color: var(--primary-green);
}

.form-note {
    text-align: center;
    font-size: 0.8125rem;
    color: var(--text-light);
    margin-top: 1.5rem;
    line-height: 1.6;
}

.contact-info {
    max-width: var(--container-narrow);
    margin: 0 auto;
    text-align: center;
    padding: 3rem;
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
}

.contact-info-title {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--primary-green);
    margin-bottom: 1.5rem;
}

.contact-tel-large {
    font-size: 2rem;
    font-weight: 500;
    color: var(--primary-green);
    margin-bottom: 0.75rem;
}

.contact-tel-large a {
    letter-spacing: 0.05em;
}

.contact-hours {
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
        --spacing-xxl: 5rem;
    }
    
    .header-container {
        flex-direction: column;
        gap: 1.5rem;
        padding: 1.25rem 1.5rem;
    }
    
    .nav {
        gap: 1.5rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-link {
        font-size: 0.875rem;
    }
    
    .hero {
        min-height: 60vh;
        padding: var(--spacing-lg) 0;
    }
    
    .hero-title {
        font-size: 1.875rem;
    }
    
    .hero-subtitle {
        font-size: 0.9375rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .work-details {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .work-card {
        padding: 2rem 1.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .page-title {
        font-size: 1.75rem;
    }
    
    .business-detail {
        padding-left: 4rem;
        margin-bottom: 4rem;
    }
    
    .business-number {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.25rem;
    }
    
    .business-detail-title {
        font-size: 1.25rem;
    }
    
    .company-table th {
        width: 120px;
        padding: 1.25rem 0.75rem;
    }
    
    .company-table td {
        padding: 1.25rem 0.75rem;
    }
    
    .contact-methods {
        gap: 1.25rem;
    }
    
    .contact-tel-large {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .hero-title {
        font-size: 1.5rem;
    }
    
    .feature-card {
        padding: 2rem 1.5rem;
    }
    
    .btn-link {
        padding: 0.875rem 2rem;
        font-size: 0.875rem;
    }
    
    .btn-submit {
        padding: 0.875rem 3rem;
        font-size: 0.9375rem;
    }
}