@import url('https://fonts.googleapis.com/css2?family=Zen+Kaku+Gothic+New:wght@300;400;500&family=Zen+Old+Mincho:wght@400;500;700&display=swap');

:root {
    --bg-color: #fcfbf9;
    --text-color: #333333;
    --text-light: #666666;
    --accent-color: #1a3c5a;
    /* Deep Indigo */
    --accent-light: #e6e8eb;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.03);

    --font-heading: 'Zen Old Mincho', serif;
    --font-body: 'Zen Kaku Gothic New', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    --container-width: 1000px;
    --header-height: 70px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-body);
    line-height: 1.8;
    font-size: 16px;
    letter-spacing: 0.05em;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 500;
    line-height: 1.4;
    color: var(--text-color);
}

h1 {
    font-size: 2.2rem;
}

h2 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
}

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

a {
    color: var(--text-color);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

a:hover {
    opacity: 0.7;
}

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

ul {
    list-style: none;
}

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

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

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

.text-small {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* Components */
.btn {
    display: inline-block;
    padding: 0.9rem 2.5rem;
    background-color: var(--text-color);
    color: var(--white);
    font-family: var(--font-body);
    font-size: 1rem;
    border: 1px solid var(--text-color);
    border-radius: 4px;
    cursor: pointer;
    letter-spacing: 0.05em;
    transition: all 0.3s ease;
    text-align: center;
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover,
.btn-secondary.active {
    background-color: var(--text-color);
    color: var(--white);
    border-color: var(--text-color);
}

.btn-accent {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.btn-accent:hover {
    background-color: transparent;
    color: var(--accent-color);
}

/* CTA Section (Page Bottom) */
.cta-section {
    background-color: var(--accent-light);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(252, 251, 249, 0.96);
    backdrop-filter: blur(8px);
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    height: 100%;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    font-size: 0.9rem;
    letter-spacing: 0.05em;
}

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

/* Header CTA Button */
.header-cta {
    background-color: var(--accent-color);
    color: var(--white);
    padding: 0.6rem 1.2rem;
    border-radius: 3px;
    font-size: 0.85rem;
    border: 1px solid var(--accent-color);
}

.header-cta:hover {
    background-color: transparent;
    color: var(--accent-color);
    opacity: 1;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
    z-index: 1001;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 1px;
    background-color: var(--text-color);
    transition: 0.3s;
}

/* Hero */
.hero {
    padding-top: calc(var(--header-height) + var(--spacing-xl));
    padding-bottom: var(--spacing-xl);
    text-align: center;
}

.hero-content {
    max-width: 680px;
    margin: 0 auto;
}

.hero-title {
    font-size: 2.8rem;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    letter-spacing: 0.1em;
}

.hero-subtitle {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.1em;
}

.hero-desc {
    font-size: 1rem;
    line-height: 2.2;
    margin-bottom: var(--spacing-md);
}

.hero-image {
    width: 100%;
    aspect-ratio: 16/9;
    background-color: #f0f0f0;
    margin: var(--spacing-md) 0;
    object-fit: cover;
    border-radius: 2px;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-md);
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
}

.feature-card {
    text-align: center;
    padding: var(--spacing-sm);
}

.feature-title {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-heading);
    color: var(--accent-color);
}

/* How to Teaser */
.howto-steps {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-md);
}

.step-item {
    flex: 1;
    min-width: 160px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

/* Purchase Flow (Important) */
.purchase-section {
    background-color: var(--bg-color);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.purchase-box {
    background-color: var(--white);
    padding: 3rem;
    border-radius: 4px;
    max-width: 640px;
    margin: 0 auto;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-label {
    display: block;
    margin-bottom: 0.6rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.9rem;
    border: 1px solid #ccc;
    border-radius: 3px;
    background-color: #fdfdfd;
    font-family: var(--font-body);
    font-size: 1rem;
    transition: border-color 0.3s;
}

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

.form-check {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
}

.form-check input {
    margin-top: 0.3rem;
}

/* Gallery Teaser */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: var(--spacing-md);
}

.gallery-item {
    aspect-ratio: 1;
    background-color: #eee;
    overflow: hidden;
    cursor: pointer;
    position: relative;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.caption {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    padding: 0.5rem;
    font-size: 0.8rem;
    text-align: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.gallery-item:hover .caption {
    opacity: 1;
}

/* Footer */
.footer {
    background-color: #222;
    color: #bbb;
    padding: var(--spacing-xl) 0 3rem;
    font-size: 0.9rem;
}

.footer-inner {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.footer-links li {
    margin-bottom: 0.8rem;
}

.footer-links a {
    color: #bbb;
}

.footer-links a:hover {
    color: var(--white);
}

.copyright {
    text-align: center;
    margin-top: 5rem;
    font-size: 0.8rem;
    opacity: 0.5;
}

/* Mobile Responsiveness */
@media (max-width: 900px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
        --header-height: 60px;
    }

    h1 {
        font-size: 2rem;
    }

    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: 0;
        background-color: var(--bg-color);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        overflow: hidden;
        transition: height 0.3s ease;
        gap: 1.5rem;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu.active {
        height: calc(100vh - var(--header-height));
    }

    .nav-link {
        font-size: 1.1rem;
    }

    /* Mobile: Header CTA handling */
    .header-cta {
        display: none;
        /* Hide button in nav list on mobile to use a different placement or keep it */
    }

    .nav-menu.active .header-cta {
        display: inline-block;
        /* Show inside menu when open */
        margin-top: 1rem;
        width: 80%;
        text-align: center;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }

    .btn {
        width: 100%;
    }

    .step-item {
        width: 100%;
        flex: none;
    }

    .purchase-box {
        padding: 1.5rem;
    }
}