/*
 * Flux Design - Minimal Glassmorphism
 * Dark mode only with frosted glass aesthetic
 */

/* ================================================
   1. CSS Custom Properties (Design Tokens)
   ================================================ */

:root {
    /* Colors - Dark Theme */
    --bg-color: #0a0a0f;
    --text-color: #e8e8e8;
    --text-secondary: #a0a0a8;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --noise-opacity: 0.08;

    /* Accent Colors */
    --accent-primary: #60a5fa;
    --accent-secondary: #a78bfa;
    --accent-gradient: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Typography */
    --font-ja: 'Zen Kaku Gothic New', sans-serif;
    --font-en: 'Lexend', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Animation */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ================================================
   2. Base Styles & Reset
   ================================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-ja);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    overflow-x: hidden;
}

/* Animated Background Blobs */
body::before,
body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.12;
    z-index: -1;
    animation: float 20s infinite ease-in-out;
}

body::before {
    width: 500px;
    height: 500px;
    background: var(--accent-gradient);
    top: -150px;
    left: -100px;
}

body::after {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary));
    bottom: -100px;
    right: -80px;
    animation-delay: -10s;
}

@keyframes float {

    0%,
    100% {
        transform: translate3d(0, 0, 0);
    }

    33% {
        transform: translate3d(50px, -50px, 0);
    }

    66% {
        transform: translate3d(-30px, 30px, 0);
    }
}

/* ================================================
   3. Typography
   ================================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-en);
    font-weight: 500;
    letter-spacing: -0.01em;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
}

/* Minimal heading sizes */
h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

/* Japanese text in headings */
h1 *,
h2 *,
h3 *,
h4 *,
h5 *,
h6 * {
    font-family: var(--font-ja);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-family: var(--font-ja);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: var(--transition-smooth);
}

a:hover {
    color: var(--accent-secondary);
}

/* ================================================
   4. Glass Components (Minimal)
   ================================================ */

.glass-card {
    position: relative;
    padding: var(--spacing-lg);
    border-radius: 1rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    overflow: hidden;
    isolation: isolate;
}

/* Frosted Glass Noise Overlay */
.glass-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' /%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.5'/%3E%3C/svg%3E");
    opacity: var(--noise-opacity);
    pointer-events: none;
    z-index: 1;
}

/* Content layer */
.glass-card .content {
    position: relative;
    z-index: 2;
}

/* Hover effect */
.glass-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
    transition: var(--transition-smooth);
}

/* ================================================
   5. Layout Components
   ================================================ */

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-2xl) 0;
}

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(20px);
    background: rgba(10, 10, 15, 0.8);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--spacing-sm) 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-en);
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
}

.nav-links a {
    color: var(--text-color);
    font-family: var(--font-ja);
    font-weight: 400;
    font-size: 0.95rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 0.5rem;
    transition: var(--transition-smooth);
}

.nav-links a:hover {
    background: var(--glass-bg);
}

/* Hero Section */
.hero {
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
}

.hero-content {
    max-width: 700px;
}

.hero h1 {
    margin-bottom: var(--spacing-md);
    font-weight: 400;
}

.hero .subtitle {
    font-family: var(--font-ja);
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-weight: 400;
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* App Card */
.app-card {
    padding: var(--spacing-xl);
    transition: var(--transition-smooth);
    cursor: pointer;
}

.app-card:hover {
    transform: translateY(-4px);
}

.app-icon {
    width: 70px;
    height: 70px;
    border-radius: 1rem;
    margin-bottom: var(--spacing-md);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.app-title {
    font-family: var(--font-ja);
    font-size: 1.4rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.app-description {
    font-family: var(--font-ja);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
    line-height: 1.6;
}

.app-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.tag {
    background: var(--glass-bg);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.85rem;
    font-family: var(--font-ja);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    font-family: var(--font-en);
    font-size: 0.95rem;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 20px rgba(96, 165, 250, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(96, 165, 250, 0.35);
}

.btn-ghost {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    font-family: var(--font-ja);
}

.btn-ghost:hover {
    background: var(--glass-bg);
    border-color: var(--accent-primary);
}

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

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.footer-links a {
    font-family: var(--font-ja);
    font-size: 0.9rem;
}

.copyright {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-family: var(--font-en);
}

/* ================================================
   6. Utility Classes
   ================================================ */

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

.text-gradient {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

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

.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mt-xl {
    margin-top: var(--spacing-xl);
}

/* ================================================
   7. Feature-specific Styles
   ================================================ */

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.feature-item {
    padding: 1.5rem;
    text-align: center;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-title {
    font-family: var(--font-ja);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.screenshot-placeholder {
    width: 100%;
    aspect-ratio: 9/19.5;
    background: var(--glass-bg);
    border-radius: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
    font-family: var(--font-ja);
}

.screenshot-img {
    width: 100%;
    height: auto;
    border-radius: 1.5rem;
    border: 1px solid var(--glass-border);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: var(--transition-smooth);
}

.screenshot-img:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

.download-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.store-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 0.75rem;
    font-weight: 500;
    transition: var(--transition-smooth);
    font-family: var(--font-en);
}

.store-badge:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

.store-badge.coming-soon {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Privacy Policy Specific */
.policy-content {
    max-width: 800px;
    margin: 0 auto;
}

.policy-content h2 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-family: var(--font-en);
    font-size: 1.5rem;
}

.policy-content h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-family: var(--font-ja);
    font-weight: 500;
    font-size: 1.1rem;
}

.policy-content p,
.policy-content ul {
    color: var(--text-secondary);
    line-height: 1.8;
    font-family: var(--font-ja);
}

.policy-content ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

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

.info-box {
    background: rgba(96, 165, 250, 0.1);
    border-left: 3px solid var(--accent-primary);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0.5rem;
}

.last-updated {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 2rem;
    font-family: var(--font-ja);
}

/* ================================================
   8. Responsive Design
   ================================================ */

@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
    }

    .nav-links {
        display: none;
    }

    .hero {
        min-height: 60vh;
        padding: var(--spacing-xl) 0;
    }

    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }
}

/* ================================================
   9. Form Styles
   ================================================ */

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

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-family: var(--font-ja);
    font-weight: 500;
    color: var(--text-color);
    font-size: 0.95rem;
}

.required {
    color: var(--accent-secondary);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 0.5rem;
    color: var(--text-color);
    font-family: var(--font-ja);
    font-size: 1rem;
    transition: var(--transition-smooth);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.05);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.form-input.error,
.form-textarea.error,
.form-select.error {
    border-color: #f87171;
}

.error-message {
    display: block;
    color: #f87171;
    font-size: 0.85rem;
    margin-top: 0.5rem;
    font-family: var(--font-ja);
    min-height: 1.2em;
}

.char-count {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: var(--font-en);
}

/* Active nav link */
.nav-links a.active {
    background: var(--glass-bg);
    color: var(--accent-primary);
}

/* ================================================
   10. Modal Styles
   ================================================ */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
}

.modal-content {
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

.confirm-item {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--glass-border);
}

.confirm-item:last-of-type {
    border-bottom: none;
}

.confirm-label {
    font-family: var(--font-ja);
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.confirm-value {
    font-family: var(--font-ja);
    color: var(--text-color);
    font-size: 1rem;
}

/* Loading Spinner */
.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--glass-border);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ================================================
   11. Print Styles (for Privacy Policy)
   ================================================ */

@media print {

    .navbar,
    .footer {
        display: none;
    }

    .glass-card {
        background: white;
        border: 1px solid #ddd;
    }

    .glass-card::before {
        display: none;
    }
}