/* Base Variables */
:root {
    /* Colors */
    --bg-color: #FAFAF9;
    /* Warm off-white (Stone-50 like) */
    --text-color: #44403C;
    /* Dark, warm gray (Stone-700 like) */
    --text-light: #78716C;
    /* Lighter warm gray */
    --accent-color: #A8A29E;
    /* Muted accent (Stone-400 like) */
    --border-color: #E7E5E4;
    /* Light border */

    /* Spacing */
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Typography */
    --font-serif: 'Noto Serif JP', serif;
    --font-sans: 'Noto Sans JP', sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 2.0;
    /* Loose line height for readability */
    letter-spacing: 0.05em;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    opacity: 0.7;
}

ul,
ol {
    list-style: none;
}

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

/* Utilities */
.container {
    width: 90%;
    max-width: 800px;
    /* Narrow container for "book-like" reading */
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.text-center {
    text-align: center;
}

/* Typography */
h1,
h2,
h3,
h4 {
    font-family: var(--font-serif);
    font-weight: 500;
    line-height: 1.5;
}

.section-title {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    position: relative;
    padding-bottom: var(--spacing-sm);
}

/* Header */
.site-header {
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    background-color: rgba(250, 250, 249, 0.9);
    backdrop-filter: blur(5px);
    z-index: 100;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.2rem;
    font-family: var(--font-serif);
    letter-spacing: 0.1em;
}

/* Buttons */
.button-primary {
    display: inline-block;
    background-color: var(--text-color);
    color: var(--bg-color);
    padding: 1rem 2.5rem;
    border-radius: 4px;
    /* Slightly rounded */
    font-size: 0.95rem;
    letter-spacing: 0.1em;
    text-align: center;
    border: 1px solid var(--text-color);
    transition: all 0.3s ease;
    margin-top: var(--spacing-md);
}

.button-primary:hover {
    background-color: transparent;
    color: var(--text-color);
}

.button-text {
    font-size: 0.9rem;
    border-bottom: 1px solid currentColor;
}

/* Hero Section */
.hero {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.1em;
}

.hero-subtitle {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-light);
}

.hero-text {
    margin-bottom: var(--spacing-lg);
    font-size: 1rem;
}

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

/* Empathy Section */
.section-empathy {
    padding: var(--spacing-xl) 0;
    background-color: #F5F5F4;
    /* Slightly darker shade */
}

.empathy-list {
    max-width: 600px;
    margin: 0 auto;
}

.empathy-list li {
    margin-bottom: var(--spacing-md);
    padding-left: 1.5em;
    position: relative;
}

.empathy-list li::before {
    content: "・";
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* Reason Section */
.section-reason {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.reason-box p {
    font-size: 1.1rem;
    font-family: var(--font-serif);
}

/* About Section */
.section-about {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.about-text p {
    margin-bottom: var(--spacing-md);
}

/* Example Section */
.section-example {
    padding: var(--spacing-xl) 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-light);
    margin-top: -3rem;
    /* Pull up closer to title */
    margin-bottom: var(--spacing-lg);
    display: block;
}

.example-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: left;
    /* Better for long text */
}

.example-content p {
    margin-bottom: var(--spacing-md);
    text-align: center;
    /* Per request for "quiet" feel, center often used in Japanese LPs. But user said "text as protagonist". Let's stick to center for now as it matches "About" */
}

.example-heading {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-color);
    margin: var(--spacing-lg) 0 var(--spacing-md);
    text-align: center;
    position: relative;
    padding-bottom: 0.5rem;
}

/* Optional: Add a subtle separator under the heading to make it clear */
.example-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 1px;
    background-color: var(--border-color);
}

.example-list {
    margin: var(--spacing-md) auto;
    max-width: 400px;
    /* Slightly wider for longer items */
    padding-left: 1.5em;
    text-align: left;
}

.example-list li {
    position: relative;
    margin-bottom: 0.8em;
    /* Slightly more space between items */
    line-height: 1.8;
}

.example-list li::before {
    content: "・";
    position: absolute;
    left: -1em;
    color: var(--accent-color);
}


.example-reference {
    margin-top: var(--spacing-xl);
    font-size: 0.95rem;
    color: var(--text-color);
    text-align: center;
}

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

.example-reference a {
    display: inline-block;
    border-bottom: 1px solid transparent;
}

.example-reference a:hover {
    border-bottom-color: var(--text-color);
    opacity: 1;
}

/* Strengths Section */
.section-strengths {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

/* Use Cases Section */
.section-use-cases {
    padding: var(--spacing-xl) 0;
    background-color: #F5F5F4;
}

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

.use-case-item {
    background: #fff;
    padding: var(--spacing-md);
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
}

.use-case-item h4 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

/* Suitability Section */
.section-suitability {
    padding: var(--spacing-xl) 0;
}

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

.suitability-content h4 {
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.suitability-content ul {
    list-style: disc;
    padding-left: 1.5rem;
    max-width: 500px;
    margin: 0 auto;
}

.suitability-content li {
    margin-bottom: 0.5rem;
}

/* Service & Price */
.section-price {
    padding: var(--spacing-xl) 0;
    text-align: center;
    background-color: #F5F5F4;
}

.price-main {
    font-size: 2rem;
    font-family: var(--font-serif);
    margin: var(--spacing-md) 0;
}

/* Flow Section */
.section-flow {
    padding: var(--spacing-xl) 0;
}

.flow-list {
    counter-reset: flow-counter;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 400px;
    margin: 0 auto;
    position: relative;
    padding-left: 20px;
}

.flow-list::before {
    content: '';
    position: absolute;
    top: 10px;
    bottom: 10px;
    left: 7px;
    /* Adjust based on circle size */
    width: 1px;
    background: var(--border-color);
}

.flow-list li {
    position: relative;
    padding-left: var(--spacing-md);
}

.flow-list li::before {
    counter-increment: flow-counter;
    content: "";
    /* Simplified for dot style, or could be content: counter(flow-counter); */
    position: absolute;
    left: -18px;
    /* Alignment */
    top: 0.6em;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--accent-color);
    border: 2px solid var(--bg-color);
    /* create gap effect */
    z-index: 1;
}

/* FAQ Section */
.section-faq {
    padding: var(--spacing-xl) 0;
    background-color: #FBFBFA;
    /* Very slightly distinct from bg-color */
}

.faq-list {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-color);
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item[open] {
    background-color: #fff;
    /* White background when open */
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
}

.faq-question {
    padding: 1.2rem var(--spacing-md);
    cursor: pointer;
    font-weight: 500;
    position: relative;
    list-style: none;
    /* Hide default triangle */
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-question::after {
    content: '+';
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    font-weight: 300;
    font-size: 1.5rem;
    color: var(--text-light);
    transition: transform 0.3s ease;
}

.faq-item[open] .faq-question::after {
    transform: translateY(-50%) rotate(45deg);
}

.faq-answer {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--text-color);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* Footer */
.site-footer {
    padding: var(--spacing-xl) 0 var(--spacing-md);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer-cta-text {
    font-size: 1.2rem;
    font-family: var(--font-serif);
    margin-bottom: var(--spacing-md);
}

.copyright {
    margin-top: var(--spacing-xl);
    font-size: 0.8rem;
    color: var(--text-light);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s ease, transform 1s ease;
}

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

.delay-1 {
    transition-delay: 0.2s;
}

.delay-2 {
    transition-delay: 0.4s;
}

.delay-3 {
    transition-delay: 0.6s;
}

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

    .use-case-list {
        grid-template-columns: 1fr 1fr;
    }

    .suitability-box {
        flex-direction: row;
        justify-content: center;
    }

    .suitability-content {
        flex: 1;
        max-width: 400px;
    }
}