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

:root {
    /* Brand Colors */
    --primary-navy: #0A1628;
    --primary-green: #00D9A3;
    --dark-navy: #050B14;
    --light-navy: #1A2B47;
    --lighter-navy: #2A3B57;
    
    /* Accent Colors */
    --accent-blue: #4F7FFF;
    --accent-light-green: #33E3B3;
    
    /* Neutral Colors */
    --white: #FFFFFF;
    --light-gray: #F8F9FA;
    --gray: #E9ECEF;
    --medium-gray: #ADB5BD;
    --dark-gray: #495057;
    --text-dark: #212529;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-navy) 0%, var(--light-navy) 100%);
    --gradient-green: linear-gradient(135deg, var(--primary-green) 0%, var(--accent-light-green) 100%);
    --gradient-overlay: linear-gradient(180deg, rgba(10, 22, 40, 0.95) 0%, rgba(10, 22, 40, 0.85) 100%);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-primary: 'Noto Sans JP', sans-serif;
    --font-secondary: 'Inter', sans-serif;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(10, 22, 40, 0.08);
    --shadow-md: 0 4px 16px rgba(10, 22, 40, 0.12);
    --shadow-lg: 0 8px 32px rgba(10, 22, 40, 0.16);
    --shadow-xl: 0 16px 48px rgba(10, 22, 40, 0.24);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    line-height: 1.7;
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* ========================================
   Typography
======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--primary-navy);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-base);
}

/* ========================================
   Buttons
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-green);
    color: var(--white);
    box-shadow: 0 4px 16px rgba(0, 217, 163, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 217, 163, 0.4);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-navy);
    border: 2px solid var(--primary-green);
}

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

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

.btn-header {
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
}

.btn-mobile {
    width: 100%;
    margin-top: var(--spacing-md);
}

/* ========================================
   Header
======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
}

.logo img {
    height: 40px;
    width: auto;
}

.nav {
    display: none;
    gap: var(--spacing-lg);
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--primary-navy);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-green);
    transition: var(--transition-base);
}

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

.mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary-navy);
    cursor: pointer;
}

@media (min-width: 992px) {
    .nav {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: none;
    }
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    background: var(--white);
    box-shadow: var(--shadow-xl);
    z-index: 1001;
    transition: var(--transition-base);
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-content {
    padding: var(--spacing-lg);
}

.mobile-menu-close {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary-navy);
    cursor: pointer;
    margin-bottom: var(--spacing-lg);
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.mobile-nav-link {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--primary-navy);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--gray);
}

/* ========================================
   Hero Section
======================================== */
.hero {
    position: relative;
    padding: calc(80px + var(--spacing-3xl)) 0 var(--spacing-3xl);
    overflow: hidden;
    background: var(--gradient-primary);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 217, 163, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(79, 127, 255, 0.1) 0%, transparent 50%);
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    gap: var(--spacing-xl);
}

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

.hero-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: var(--spacing-md);
    color: var(--white);
    line-height: 1.2;
}

.hero-title .highlight {
    background: var(--gradient-green);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
    line-height: 1.8;
}

.hero-cta {
    margin-bottom: var(--spacing-xl);
}

.cta-note {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    opacity: 0.8;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-lg);
    padding-top: var(--spacing-lg);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--primary-green);
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-secondary);
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.8;
}

.hero-image-wrapper {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.ui-preview {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

@media (min-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr 1fr;
        align-items: center;
        gap: var(--spacing-3xl);
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
}

/* ========================================
   Section Styles
======================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: var(--spacing-md);
    color: var(--primary-navy);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--dark-gray);
}

/* ========================================
   Features Section
======================================== */
.features {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

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

.feature-card {
    padding: var(--spacing-xl);
    background: var(--white);
    border: 2px solid var(--gray);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-green);
}

.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-green);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-size: 1.75rem;
    color: var(--white);
}

.feature-title {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-navy);
}

.feature-description {
    color: var(--dark-gray);
    line-height: 1.7;
}

/* ========================================
   How It Works Section
======================================== */
.how-it-works {
    padding: var(--spacing-3xl) 0;
    background: var(--light-gray);
}

.steps {
    max-width: 800px;
    margin: 0 auto;
}

.step {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.step-number {
    font-size: 3rem;
    font-weight: 900;
    font-family: var(--font-secondary);
    background: var(--gradient-green);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.step-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-navy);
}

.step-description {
    color: var(--dark-gray);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.step-image {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.step-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

.step-divider {
    text-align: center;
    font-size: 2rem;
    color: var(--primary-green);
    margin: var(--spacing-lg) 0;
}

@media (min-width: 768px) {
    .step {
        grid-template-columns: auto 1fr;
        align-items: start;
    }
    
    .step-number {
        position: sticky;
        top: 100px;
    }
}

/* ========================================
   Examples Section
======================================== */
.examples {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.examples-filter {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.filter-btn {
    padding: 0.625rem 1.25rem;
    background: var(--white);
    border: 2px solid var(--gray);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font-primary);
    color: var(--dark-gray);
    cursor: pointer;
    transition: all var(--transition-base);
}

.filter-btn:hover, .filter-btn.active {
    background: var(--primary-green);
    color: var(--white);
    border-color: var(--primary-green);
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.example-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.example-card.hidden {
    display: none;
}

.example-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.example-image img {
    width: 100%;
    height: auto;
    display: block;
}

.example-label {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
}

.example-category {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gradient-green);
    color: var(--white);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.examples-note {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.examples-note p {
    font-size: 0.9rem;
    color: var(--medium-gray);
}

/* ========================================
   Pricing Section
======================================== */
.pricing {
    padding: var(--spacing-3xl) 0;
    background: var(--light-gray);
}

.pricing-content {
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-plans {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--white);
    border: 2px solid var(--gray);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-green);
}

.pricing-card-featured {
    border: 3px solid var(--primary-green);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

.pricing-card-featured:hover {
    transform: translateY(-8px) scale(1.05);
}

.pricing-desc {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-lg);
    font-size: 0.95rem;
}

.pricing-card-current {
    background: var(--white);
    border: 3px solid var(--primary-green);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.pricing-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-green);
    color: var(--white);
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.875rem;
    box-shadow: var(--shadow-md);
}

.pricing-title {
    font-size: 1.75rem;
    font-weight: 900;
    margin-bottom: var(--spacing-md);
    color: var(--primary-navy);
}

.pricing-price {
    margin-bottom: var(--spacing-sm);
}

.price-amount {
    font-size: 3rem;
    font-weight: 900;
    font-family: var(--font-secondary);
    color: var(--primary-green);
}

.price-period {
    font-size: 1.25rem;
    color: var(--dark-gray);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-xl);
    text-align: left;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.pricing-features li {
    padding: var(--spacing-sm) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1rem;
    color: var(--dark-gray);
}

.pricing-features i {
    color: var(--primary-green);
    font-size: 1.125rem;
}

.pricing-note {
    background: var(--light-gray);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
    color: var(--dark-gray);
}

.pricing-note strong {
    color: var(--primary-green);
}

.pricing-future {
    padding: var(--spacing-xl);
    background: var(--white);
    border-radius: var(--radius-lg);
    text-align: center;
}

.future-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-navy);
}

.future-plans {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.future-plan {
    padding: var(--spacing-lg);
    border: 2px solid var(--gray);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.future-plan:hover {
    border-color: var(--primary-green);
    transform: translateY(-4px);
}

.future-plan h5 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-navy);
}

.future-price {
    font-size: 1.75rem;
    font-weight: 900;
    color: var(--primary-green);
    margin-bottom: var(--spacing-xs);
}

.future-price span {
    font-size: 1rem;
    color: var(--dark-gray);
}

.future-desc {
    font-size: 0.875rem;
    color: var(--dark-gray);
}

/* ========================================
   FAQ Section
======================================== */
.faq {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border: 2px solid var(--gray);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    transition: all var(--transition-base);
}

.faq-item:hover {
    border-color: var(--primary-green);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    user-select: none;
}

.faq-question h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary-navy);
}

.faq-question i {
    color: var(--primary-green);
    font-size: 1.25rem;
    transition: var(--transition-base);
}

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

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

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-md);
    color: var(--dark-gray);
    line-height: 1.8;
}

/* ========================================
   Signup Section
======================================== */
.signup {
    padding: var(--spacing-3xl) 0;
    background: var(--gradient-primary);
}

.signup-content {
    text-align: center;
    color: var(--white);
}

.signup-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: var(--spacing-md);
    color: var(--white);
}

.signup-subtitle {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
    line-height: 1.8;
}

.signup-form-wrapper {
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.form-placeholder {
    background: rgba(255, 255, 255, 0.1);
    border: 2px dashed rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-3xl) var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    color: var(--white);
}

.form-placeholder i {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

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

.form-note {
    font-size: 0.9rem;
    opacity: 0.7;
}

.signup-benefits {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

.benefit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
}

.benefit i {
    color: var(--primary-green);
    font-size: 1.25rem;
}

/* ========================================
   Footer
======================================== */
.footer {
    background: var(--primary-navy);
    color: var(--white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo img {
    height: 40px;
    margin-bottom: var(--spacing-md);
}

.footer-description {
    font-size: 0.9rem;
    opacity: 0.8;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--white);
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--primary-green);
    transform: translateY(-4px);
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--white);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
    transition: var(--transition-base);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 0.875rem;
    opacity: 0.7;
}

/* ========================================
   Scroll to Top Button
======================================== */
.scroll-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 50px;
    height: 50px;
    background: var(--gradient-green);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    transform: translateY(-4px);
}

/* ========================================
   Animations
======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.8s ease forwards;
    opacity: 0;
}

.fade-in:nth-child(1) { animation-delay: 0.1s; }
.fade-in:nth-child(2) { animation-delay: 0.2s; }
.fade-in:nth-child(3) { animation-delay: 0.3s; }
.fade-in:nth-child(4) { animation-delay: 0.4s; }

.scroll-fade {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease;
}

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

/* ========================================
   Responsive Utilities
======================================== */
@media (max-width: 767px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.875rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .examples-grid {
        grid-template-columns: 1fr;
    }
    
    .signup-benefits {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .btn-large {
        padding: 1rem 2rem;
        font-size: 1rem;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 1.625rem;
    }
    
    .price-amount {
        font-size: 3rem;
    }
}

/* ========================================
   Stripe Signup Form Custom Styles
   (フォームパーツ、入力欄、ボタン、スピナーなど)
======================================== */
.custom-form-wrapper {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    text-align: left;
}

.signup-form .form-group {
    margin-bottom: var(--spacing-md);
}

.signup-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.signup-form label {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary-navy);
    margin-bottom: 0.5rem;
}

.signup-form input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: var(--font-primary);
    transition: var(--transition-fast);
}

.signup-form input:focus {
    border-color: var(--primary-green);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 217, 163, 0.2);
}

/* Stripe Element Style */
.stripe-input {
    padding: 0.8rem;
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-sm);
    background: #fff;
}

.stripe-input.StripeElement--focus {
    border-color: var(--primary-green);
    box-shadow: 0 0 0 3px rgba(0, 217, 163, 0.2);
}

.error-msg {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

/* Checkbox Style */
.checkbox-group {
    margin-top: var(--spacing-lg);
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--dark-gray);
    cursor: pointer;
}

.checkbox-label a {
    color: var(--primary-green);
    text-decoration: underline;
}

/* Button & Spinner */
.btn-block {
    width: 100%;
    margin-top: var(--spacing-md);
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
    display: inline-block;
    vertical-align: middle;
}

.hidden { display: none; }
.mt-4 { margin-top: 1rem; }

@keyframes spin {
    to { transform: rotate(360deg); }
}

@media (max-width: 480px) {
    .signup-form .form-row {
        grid-template-columns: 1fr;
    }
    .custom-form-wrapper {
        padding: var(--spacing-md);
    }
}

/* ========================================
   Signup Page Layout (New Page)
   (signup.html専用のレイアウト)
======================================== */
.signup-page-body {
    background: var(--light-gray);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.simple-header {
    background: var(--white);
    padding: var(--spacing-sm) 0;
    box-shadow: var(--shadow-sm);
}

/* ヘッダー内のロゴ位置調整 */
.simple-header .container {
    display: flex;
    align-items: center;
}

.signup-main {
    flex: 1;
    padding: var(--spacing-2xl) 0;
}

.signup-content-centered {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.signup-page-title {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-navy);
}

.signup-page-subtitle {
    margin-bottom: var(--spacing-xl);
    color: var(--dark-gray);
    line-height: 1.6;
}

.simple-footer {
    padding: var(--spacing-md) 0;
    text-align: center;
    color: var(--medium-gray);
    font-size: 0.875rem;
    background: transparent; /* signupページでは背景なし */
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--dark-gray);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-base);
    margin-top: var(--spacing-lg);
}

.back-link:hover {
    color: var(--primary-green);
    transform: translateX(-4px);
}

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

@media (max-width: 768px) {
    .signup-page-title {
        font-size: 1.5rem;
    }
    .signup-main {
        padding: var(--spacing-xl) 0;
    }
}