/* ==========================================================================
   CSS Variables & Design System (FORMAL & SIMPLE)
   ========================================================================== */
:root {
    /* Colors - Formal Palette */
    --primary-color: #1A365D;
    /* Deep Navy Blue for Trust and Formality */
    --primary-light: #2B6CB0;
    --primary-dark: #0F172A;
    --secondary-color: #4A5568;
    /* Slate Gray */
    --accent-color: #3182CE;
    /* Bright Blue for links/accents */

    --text-main: #2D3748;
    --text-muted: #718096;
    --text-light: #FFFFFF;

    --bg-main: #FFFFFF;
    --bg-white: #FFFFFF;
    --bg-soft: #F7FAFC;
    /* Clean, very light cool gray */

    --border-color: #E2E8F0;

    /* Typography */
    --font-heading: 'Noto Sans JP', sans-serif;
    /* Standard, formal Japanese font */
    --font-body: 'Noto Sans JP', sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;

    /* Layout */
    --container-width: 1000px;
    /* Narrower for better readability in formal layout */
    --header-height: 80px;

    /* Shadows - Very subtle */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

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

body {
    font-family: var(--font-body);
    color: var(--text-main);
    background-color: var(--bg-main);
    line-height: 1.8;
    /* Slightly looser line-height for readability */
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    line-height: 1.4;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--primary-dark);
}

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

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

ul {
    list-style: none;
}

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

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ==========================================================================
   Typography Utilities
   ========================================================================== */
.text-center {
    text-align: center;
}

.highlight {
    color: var(--primary-color);
}

/* ==========================================================================
   Buttons (Formal, straight edges)
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 40px;
    border-radius: 4px;
    /* Straight clean edges */
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    color: var(--text-light);
}

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

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--text-light);
}

.btn-sm {
    padding: 10px 24px;
    font-size: 0.9rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: #FFFFFF;
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header.scrolled {
    height: 70px;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 2px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

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

.nav-link {
    color: var(--text-main);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 8px 0;
}

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 30px;
    height: 20px;
    position: relative;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--primary-dark);
    position: absolute;
    left: 0;
    transition: all var(--transition-normal);
}

.menu-toggle span:nth-child(1) {
    top: 0;
}

.menu-toggle span:nth-child(2) {
    top: 9px;
}

.menu-toggle span:nth-child(3) {
    top: 18px;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg);
    top: 9px;
}

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

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg);
    top: 9px;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
    position: relative;
    padding-top: calc(var(--header-height) + var(--space-xl));
    padding-bottom: var(--space-xl);
    background-color: var(--bg-soft);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.hero-bg-shape {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('../images/hero_formal.png');
    background-size: cover;
    background-position: center;
    z-index: 0;
}

.hero-bg-shape::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to right, rgba(247, 250, 252, 0.95) 0%, rgba(247, 250, 252, 0.6) 60%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
    animation: fadeUp 1s ease forwards;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
    line-height: 1.5;
}

.hero-description {
    font-size: 1.1rem;
    /*color: var(--text-muted);*/
    color: black;
    margin-bottom: var(--space-lg);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ==========================================================================
   Sections General
   ========================================================================== */
.section {
    padding: var(--space-xl) 0;
}

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

.bg-soft {
    background-color: var(--bg-soft);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

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

.text-white {
    color: var(--text-light);
}

.section-header {
    margin-bottom: var(--space-lg);
    position: relative;
}

.section-title {
    font-size: 2rem;
}

.section-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 2px;
    background-color: var(--primary-color);
    margin: var(--space-sm) auto 0;
}

.section-subtitle {
    display: block;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 4px;
}

.lead {
    font-size: 1.1rem;
    color: var(--text-main);
    text-align: center;
    margin-bottom: var(--space-lg);
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.mb-4 {
    margin-bottom: var(--space-md);
}

.mb-5 {
    margin-bottom: calc(var(--space-md) * 1.5);
}

/* ==========================================================================
   Features
   ========================================================================== */
.highlight-title {
    font-size: 1.4rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: var(--space-md);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
}

.feature-card {
    padding: var(--space-lg);
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    text-align: center;
}

.feature-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--space-sm);
}

.feature-title {
    font-size: 1.1rem;
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ==========================================================================
   Services
   ========================================================================== */
.services-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.service-item {
    display: flex;
    align-items: flex-start;
    /* top align for formal look */
    gap: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.service-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.service-icon {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    color: var(--primary-color);
    font-size: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.service-content {
    flex-grow: 1;
}

.service-title {
    font-size: 1.4rem;
    margin-bottom: var(--space-sm);
}

.service-desc {
    color: var(--text-main);
    margin-bottom: var(--space-sm);
}

.service-details {
    list-style: none;
    margin-top: var(--space-sm);
    font-size: 0.95rem;
}

.service-details li {
    margin-bottom: 4px;
    color: var(--text-muted);
}

.text-primary {
    color: var(--primary-color);
    margin-right: 8px;
}

/* ==========================================================================
   Safety
   ========================================================================== */
.safety-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-md);
}

.safety-card {
    border-left: 3px solid var(--primary-color);
    padding-left: var(--space-sm);
}

.safety-number {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary-light);
    margin-bottom: 4px;
}

.safety-card h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.safety-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* ==========================================================================
   Timeline
   ========================================================================== */
.timeline {
    max-width: 600px;
    margin: 0 auto;
}

.timeline-item {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.timeline-dot {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: var(--text-light);
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
}

.timeline-content {
    padding-top: 8px;
}

.timeline-content h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* ==========================================================================
   Representative (Strictly Formal & Simple)
   ========================================================================== */
.rep-wrapper-formal {
    max-width: 700px;
    margin: 0 auto;
}

.rep-image-container {
    margin-bottom: var(--space-lg);
}

.rep-image-formal {
    width: 180px;
    /* Medium size */
    height: auto;
    margin: 0 auto var(--space-sm);
    display: block;
    border: none;
    /* No decorative frame */
    box-shadow: none;
    /* Keep it flat and formal */
}

.rep-name-formal {
    font-weight: 600;
    color: var(--text-main);
    font-size: 1.1rem;
}

.rep-text-formal p {
    margin-bottom: var(--space-md);
    color: var(--text-main);
    text-align: justify;
    /* Formal reading structure */
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
    border-top: 1px solid var(--border-color);
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
}

.faq-question {
    padding: var(--space-md) 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.faq-question h4 {
    margin: 0;
    font-size: 1.05rem;
}

.faq-toggle {
    color: var(--primary-color);
    transition: transform var(--transition-fast);
}

.faq-item.active .faq-toggle {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.faq-item.active .faq-answer {
    padding-bottom: var(--space-md);
    max-height: 200px;
    opacity: 1;
}

/* ==========================================================================
   Contact
   ========================================================================== */
.contact-wrapper {
    max-width: 600px;
    margin: 0 auto;
}

.contact-form-container {
    background: var(--bg-white);
    padding: var(--space-lg);
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: var(--space-md);
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-main);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    font-family: inherit;
    background: var(--bg-soft);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-white);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background-color: var(--primary-dark);
    color: var(--text-light);
    padding: var(--space-xl) 0 var(--space-md);
    text-align: center;
}

.footer-logo {
    color: var(--text-light);
    margin-bottom: var(--space-sm);
    font-size: 1.5rem;
}

.footer .company-desc {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    margin-bottom: var(--space-md);
}

.footer .company-address {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    margin-bottom: var(--space-lg);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--space-md);
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==========================================================================
   Media Queries
   ========================================================================== */
@media (max-width: 991px) {
    .menu-toggle {
        display: block;
    }

    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--bg-white);
        flex-direction: column;
        align-items: center;
        padding: var(--space-lg);
        transition: left var(--transition-normal);
        overflow-y: auto;
    }

    .main-nav.active {
        left: 0;
    }

    .nav-list {
        flex-direction: column;
        width: 100%;
        text-align: center;
        margin-bottom: var(--space-md);
    }

    .service-item {
        flex-direction: column;
        text-align: center;
    }

    .service-icon {
        margin: 0 auto;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 1.8rem;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .timeline-item {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }

    .timeline-dot {
        margin: 0 auto;
    }
}