@charset "UTF-8";
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700;900&display=swap');

/* =========================================
   CSS Variables & Reset
   ========================================= */
:root {
    --color-primary: #2C5F4F;
    --color-primary-dark: #1F4437;
    --color-primary-light: #E8F4F0;
    --color-accent: #4A90A4;
    --color-accent-hover: #3A7A8C;
    
    --color-bg-white: #FFFFFF;
    --color-bg-light: #F7F9FC;
    --color-bg-blue: #EBF5F9;
    --color-bg-green: #E8F4F0;
    
    --color-text-main: #1A2332;
    --color-text-secondary: #4A5568;
    --color-text-light: #718096;
    
    --color-border: #E2E8F0;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-shadow-hover: rgba(0, 0, 0, 0.15);
    
    --font-primary: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 6rem;
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    --shadow-sm: 0 2px 8px var(--color-shadow);
    --shadow-md: 0 4px 16px var(--color-shadow);
    --shadow-hover: 0 8px 24px var(--color-shadow-hover);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text-main);
    background-color: var(--color-bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
}

/* =========================================
   Typography
   ========================================= */
h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.01em;
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: var(--spacing-sm);
}

.lead {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    font-weight: 500;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

p {
    margin-bottom: var(--spacing-sm);
}

strong {
    font-weight: 700;
    color: var(--color-primary);
}

.hero strong {
    color: white;
}

/* =========================================
   Layout
   ========================================= */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 clamp(1rem, 3vw, 2rem);
}

.container-narrow {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 clamp(1rem, 3vw, 2rem);
}

.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    padding: 0.5rem 1rem;
    background: var(--color-primary);
    color: white;
    z-index: 1000;
}

.skip-link:focus {
    top: 0;
}

/* =========================================
   Header
   ========================================= */
header {
    background: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    gap: 1rem;
}

.brand a {
    font-size: 1.25rem;
    font-weight: 900;
    color: var(--color-primary);
    letter-spacing: 0.03em;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

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

.brand-logo {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}

nav ul {
    list-style: none;
    display: flex;
    gap: clamp(0.5rem, 2vw, 1.5rem);
    flex-wrap: wrap;
}

nav a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    white-space: nowrap;
}

nav a:hover,
nav a[aria-current="page"] {
    color: var(--color-primary);
    background: var(--color-bg-green);
}

/* =========================================
   Hero Section
   ========================================= */
.hero {
    background: linear-gradient(135deg, rgba(44, 95, 79, 0.6) 0%, rgba(74, 144, 164, 0.6) 100%),
                url('../img/hero-bg.jpg') center/cover no-repeat;
    color: white;
    padding: var(--spacing-2xl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(45deg, transparent 0%, rgba(255, 255, 255, 0.05) 100%);
    pointer-events: none;
}

.hero::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 80px;
    background: var(--color-bg-white);
    clip-path: polygon(0 50%, 100% 0, 100% 100%, 0 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    color: white;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.hero .lead {
    color: rgba(255, 255, 255, 0.95);
}

.hero p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.05rem;
}

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

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

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

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

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

.section-diagonal::before {
    content: "";
    position: absolute;
    top: -60px;
    left: 0;
    width: 100%;
    height: 60px;
    background: inherit;
    clip-path: polygon(0 100%, 100% 0, 100% 100%, 0 100%);
}

.section-diagonal {
    position: relative;
}

/* =========================================
   Cards & Content Blocks
   ========================================= */
.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

@media (max-width: 900px) {
    .card-grid {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--color-bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

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

.card h3 {
    color: var(--color-primary);
}

.card-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    background: var(--color-primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-icon svg {
    width: 36px;
    height: 36px;
}

/* =========================================
   Lists
   ========================================= */
.feature-list {
    list-style: none;
    margin-top: var(--spacing-md);
}

.feature-list li {
    padding: var(--spacing-sm) 0;
    padding-left: 2rem;
    position: relative;
    line-height: 1.7;
}

.feature-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
    font-size: 1.25rem;
}

/* =========================================
   Process Flow
   ========================================= */
.process-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.process-step {
    background: var(--color-bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
    box-shadow: var(--shadow-sm);
    position: relative;
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.process-step::before {
    content: attr(data-step);
    position: absolute;
    top: -12px;
    left: var(--spacing-md);
    background: var(--color-primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
}

.process-step h3 {
    margin-top: 0;
    margin-bottom: var(--spacing-xs);
    font-size: 1.25rem;
}

.process-icon {
    width: 60px;
    height: 60px;
    flex-shrink: 0;
}

.process-icon svg {
    width: 100%;
    height: 100%;
}

.process-content {
    flex: 1;
}

.process-content p {
    margin-bottom: 0;
}

/* プロセス説明用画像 */
.section-visual {
    max-width: 100%;
    margin: var(--spacing-lg) auto;
}

.section-visual img {
    width: 100%;
    max-width: 800px;
    height: auto;
    margin: 0 auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

/* =========================================
   Buttons & CTAs
   ========================================= */
.cta-group {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.cta-group.left {
    justify-content: flex-start;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 700;
    text-align: center;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

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

/* =========================================
   Footer
   ========================================= */
footer {
    background: var(--color-text-main);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-2xl);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    font-size: 0.9rem;
}

footer a {
    color: rgba(255, 255, 255, 0.9);
    transition: var(--transition);
}

footer a:hover {
    color: white;
}

/* =========================================
   Thank You Page
   ========================================= */
.checkmark {
    width: 80px;
    height: 80px;
    margin: 0 auto 2rem;
    background: var(--color-primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.checkmark svg {
    width: 48px;
    height: 48px;
}

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

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
    }
    
    nav ul {
        width: 100%;
        justify-content: flex-start;
    }
    
    .hero {
        padding: var(--spacing-xl) 0;
    }
    
    section {
        padding: var(--spacing-lg) 0;
    }
    
    .cta-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .process-grid {
        grid-template-columns: 1fr;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 2.5rem;
        --spacing-2xl: 3.5rem;
    }
    
    nav a {
        font-size: 0.85rem;
        padding: 0.4rem 0.6rem;
    }
}