/* CSS Variables */
:root {
    /* Colors */
    --bg-dark: #0f172a;
    --bg-mesh-1: #1e3a8a;
    --bg-mesh-2: #0f766e;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --accent-gold: #fbbf24;
    --accent-blue: #38bdf8;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
}

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

body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

ul {
    list-style: none;
}

/* Background Mesh Gradient */
.background-mesh {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: radial-gradient(circle at 0% 0%, var(--bg-mesh-1), transparent 50%),
                radial-gradient(circle at 100% 100%, var(--bg-mesh-2), transparent 50%),
                var(--bg-dark);
    opacity: 0.6;
}

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

/* Header */
.header {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-lg);
}

.page-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(to right, #fff, var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--spacing-xs);
    letter-spacing: 0.05em;
}

.page-subtitle {
    font-family: 'Montserrat', sans-serif;
    font-size: 1rem;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    opacity: 0.8;
}

/* Plans Grid */
.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    align-items: stretch;
}

/* Plan Card */
.plan-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.plan-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.5);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Recommended Ribbon */
.plan-middle.recommended {
    border: 1px solid rgba(251, 191, 36, 0.3);
    background: rgba(255, 255, 255, 0.08);
}

.ribbon {
    position: absolute;
    top: 20px;
    right: -30px;
    background: var(--accent-gold);
    color: #000;
    padding: 5px 30px;
    transform: rotate(45deg);
    font-size: 0.75rem;
    font-weight: 700;
    font-family: 'Montserrat', sans-serif;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    z-index: 10;
}

/* Card Header */
.card-header {
    text-align: center;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.plan-rank {
    display: block;
    font-size: 0.875rem;
    color: var(--accent-blue);
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.plan-name {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.plan-price {
    font-family: 'Montserrat', sans-serif;
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: baseline;
    justify-content: center;
    line-height: 1;
}

.plan-max .plan-price {
    font-size: 1.8rem;
}

.currency {
    font-size: 1rem;
    margin-right: 4px;
    font-weight: 400;
}

.period {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-left: 4px;
}

.price-prefix {
    font-size: 0.8rem;
    margin-right: 5px;
    color: var(--text-secondary);
}

.price-note {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

/* Card Body */
.card-body {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.card-body h3 {
    font-size: 1rem;
    color: var(--accent-blue);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    display: flex;
    align-items: center;
}

.card-body h3::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--accent-blue);
    border-radius: 50%;
    margin-right: 8px;
}

.card-body ul li {
    font-size: 0.925rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    padding-left: 1rem;
    position: relative;
    line-height: 1.5;
}

.card-body ul li::before {
    content: '•';
    color: var(--text-secondary);
    position: absolute;
    left: 0;
    opacity: 0.5;
}

.plan-benefit {
    background: rgba(56, 189, 248, 0.1);
    border-left: 3px solid var(--accent-blue);
    padding: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    font-size: 0.9rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.plan-details {
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    margin-top: auto; /* Push to bottom */
}

.plan-details dl {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 8px 16px;
    font-size: 0.875rem;
}

.plan-details dt {
    color: var(--text-secondary);
    opacity: 0.8;
}

.plan-details dd {
    font-weight: 500;
}

.detail-sub {
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* Common Section */
.common-section {
    margin-bottom: var(--spacing-xl);
}

.section-title {
    text-align: center;
    font-family: 'Montserrat', sans-serif;
    font-size: 1.75rem;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(to right, #cbd5e1, #fff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.info-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.info-card h3 {
    color: var(--accent-gold);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
    border-bottom: 1px solid rgba(251, 191, 36, 0.2);
    padding-bottom: 0.5rem;
}

.info-card p, .info-card li {
    font-size: 0.925rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.info-card .highlight {
    font-weight: 700;
    color: #fff;
    background: linear-gradient(90deg, rgba(251, 191, 36, 0.1), transparent);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.info-card small {
    display: block;
    margin-top: var(--spacing-sm);
    font-size: 0.8rem;
    color: #94a3b8;
    line-height: 1.4;
}

.payment-list dt {
    color: var(--text-primary);
    font-weight: 500;
    margin-top: 0.75rem;
}

.payment-list dd {
    color: var(--text-secondary);
    padding-left: 0.5rem;
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-family: 'Montserrat', sans-serif;
}

/* Responsiveness */
@media (max-width: 768px) {
    .page-title {
        font-size: 2rem;
    }

    .plans-grid {
        grid-template-columns: 1fr; /* Stack vertically on small screens */
    }

    .plan-card:hover {
        transform: none; /* Disable hover float on touch devices */
    }
}