/* ---
   Prokaiwa | Super Saiyan God Stylesheet
   --- */

/* 1. Global Setup & CSS Variables (The Ki Control)
   ===================================================== */
:root {
    --color-primary: #008080;
    --color-primary-dark: #006666;
    --color-primary-light: #e0e7e8;
    --color-accent: #004d4d;
    --color-text: #333333;
    --color-text-light: #555555;
    --color-bg: #f7f9fa;
    --color-surface: #ffffff;
    --color-border: #e1e1e1;

    --font-primary: 'Helvetica Neue', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --spacing-unit: 1rem;
    --border-radius: 12px;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.12);
    --transition-speed: 0.3s;
}

/* 2. Base & Reset Styles
   ===================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 100%; /* Respect user's browser font size settings */
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
}

.container {
    width: 90%;
    max-width: 900px;
    margin: 0 auto;
    padding: clamp(2rem, 5vw, 4rem) 0;
}

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

/* 3. Header & Navigation
   ===================================================== */
.site-header {
    text-align: center;
    padding-top: var(--spacing-unit);
}

.site-header .container {
    padding-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.logo {
    max-width: clamp(180px, 25vw, 250px);
    margin: 0 auto 1.5rem;
}

.tagline {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    color: var(--color-primary);
    font-weight: 700;
    margin-bottom: 2rem;
}

.social-nav {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.social-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.8rem;
    height: 2.8rem;
    background-color: var(--color-primary-light);
    color: var(--color-primary-dark);
    border-radius: 50%;
    text-decoration: none;
    font-size: 1.4rem;
    transition: all var(--transition-speed) ease;
}

.social-icon:hover, .social-icon:focus {
    background-color: var(--color-primary);
    color: var(--color-surface);
    transform: translateY(-4px) scale(1.1);
    box-shadow: var(--shadow-hover);
}

/* 4. Main Content & Language Toggle
   ===================================================== */
main .container {
    background-color: var(--color-surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: clamp(1.5rem, 5vw, 3rem);
    margin-bottom: 3rem;
}

.lang-toggle {
    display: flex;
    justify-content: center;
    margin-bottom: 2.5rem;
    background-color: var(--color-primary-light);
    border-radius: var(--border-radius);
    padding: 0.3rem;
}

.lang-toggle button {
    background: transparent;
    color: var(--color-text-light);
    border: none;
    border-radius: 8px;
    padding: 0.6rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}

.lang-toggle button.active {
    background: var(--color-primary);
    color: var(--color-surface);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.lang-section {
    display: none;
    opacity: 0;
    transition: opacity var(--transition-speed) ease-in-out;
}

.lang-section.show {
    display: block;
    opacity: 1;
}

.section-title {
    text-align: center;
    font-size: clamp(1.5rem, 5vw, 2rem);
    color: var(--color-accent);
    margin-bottom: 2.5rem;
}

/* 5. Plans Grid (Responsive Card Layout)
   ===================================================== */
.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.plan-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: left;
    transition: all var(--transition-speed) ease;
}

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

.plan-title {
    font-size: 1.25rem;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.plan-price {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.plan-description {
    font-size: 0.95rem;
    color: var(--color-text-light);
}


/* 6. CTA & Footer
   ===================================================== */
.cta-section {
    margin-top: 3rem;
    padding-top: 3rem;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.cta-section h2 {
    font-size: clamp(1.3rem, 4vw, 1.75rem);
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.cta-section p {
    max-width: 60ch;
    margin: 0 auto 2rem;
}

.cta-button {
    display: inline-block;
    background-color: var(--color-primary);
    color: var(--color-surface);
    padding: 0.9rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 700;
    transition: all var(--transition-speed) ease;
    box-shadow: var(--shadow);
}

.cta-button:hover, .cta-button:focus {
    background-color: var(--color-primary-dark);
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-hover);
}

.cta-button .en-text,
.cta-button .ja-text {
    display: none;
}
.cta-button.show-en .en-text,
.cta-button.show-ja .ja-text {
    display: inline;
}


.site-footer {
    text-align: center;
    padding-bottom: 2rem;
}

.site-footer p {
    font-size: 0.9rem;
    color: #888;
}

/* 7. Mobile Adjustments (Minimal thanks to fluid design)
   ===================================================== */
@media (max-width: 480px) {
    .plans-grid {
        grid-template-columns: 1fr; /* Stack cards on very small screens */
    }

    .lang-toggle button {
        padding: 0.5rem 1rem;
    }
}