/* Shared Design System — appstore.3523128.com */

/*
 * CSS Custom Properties shared across all App product pages.
 * Each App's style.css overrides --accent-* and other brand tokens.
 * Loading order: shared/style.css → [AppName]/style.css
 */

:root {
    /* === Base Colors === */
    --bg-color: #0a0a0f;
    --surface-color: #12121a;
    --card-bg: #1a1a26;
    --text-color: #f0f0f5;
    --secondary-text: #8888a0;
    --border-color: rgba(255, 255, 255, 0.06);

    /* === Brand Tokens (override per app) === */
    --accent-color: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --gradient-start: #6366f1;
    --gradient-end: #a855f7;
    --success-color: #22c55e;

    /* === Typography === */
    --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;

    /* === Spacing === */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 80px;

    /* === Layout === */
    --max-width: 1080px;
    --content-max-width: 800px;
    --border-radius: 16px;
    --border-radius-sm: 8px;

    /* === Transitions === */
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Reset === */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

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

a:hover {
    color: var(--gradient-end);
}

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

/* === Container === */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* === Unified Header === */
.site-header {
    padding: var(--space-lg) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.site-logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.site-logo:hover {
    color: var(--accent-color);
}

/* === Unified Navigation === */
.site-nav {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.site-nav a {
    color: var(--secondary-text);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition);
    white-space: nowrap;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--text-color);
}

/* Dropdown for Apps */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    color: var(--secondary-text);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    background: none;
    border: none;
    font-family: inherit;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: color var(--transition);
}

.nav-dropdown-toggle:hover {
    color: var(--text-color);
}

.nav-dropdown-toggle::after {
    content: '▾';
    font-size: 0.7rem;
    margin-left: 2px;
}

.nav-dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: var(--space-sm) 0;
    min-width: 180px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    margin-top: var(--space-sm);
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown-menu:focus-within {
    display: block;
}

.nav-dropdown-menu a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: 0.9rem;
}

.nav-dropdown-menu a:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
}

/* === Breadcrumb === */
.breadcrumb {
    padding: var(--space-md) 0 0;
    font-size: 0.85rem;
    color: var(--secondary-text);
}

.breadcrumb ol {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.breadcrumb li {
    display: flex;
    align-items: center;
}

.breadcrumb li + li::before {
    content: '/';
    margin: 0 var(--space-sm);
    color: var(--secondary-text);
    opacity: 0.4;
}

.breadcrumb a {
    color: var(--secondary-text);
}

.breadcrumb a:hover {
    color: var(--text-color);
}

.breadcrumb [aria-current="page"] {
    color: var(--text-color);
    font-weight: 500;
}

/* === Section Titles === */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
}

/* === CTA Button === */
.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: #fff;
    padding: 16px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform var(--transition), box-shadow var(--transition);
    box-shadow: 0 4px 24px var(--accent-glow);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px var(--accent-glow);
    color: #fff;
}

/* === Feature Cards Grid === */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.feature-card {
    background: var(--card-bg);
    padding: var(--space-xl);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: transform var(--transition), border-color var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-color);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: 20px;
    flex-shrink: 0;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--secondary-text);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* === How It Works / Steps === */
.steps-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    max-width: 720px;
    margin: 0 auto;
}

.step-item {
    display: flex;
    gap: var(--space-lg);
    align-items: flex-start;
}

.step-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.2rem;
    margin-bottom: var(--space-sm);
}

.step-content p {
    color: var(--secondary-text);
    font-size: 0.95rem;
}

/* === Platforms === */
.platforms-grid {
    display: flex;
    justify-content: center;
    gap: var(--space-2xl);
    flex-wrap: wrap;
}

.platform-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.platform-icon {
    width: 80px;
    height: 80px;
    background: var(--card-bg);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    border: 1px solid var(--border-color);
}

.platform-item span {
    color: var(--secondary-text);
    font-size: 0.9rem;
}

/* === Page Content (Privacy, Support pages) === */
.page-content {
    padding: var(--space-4xl) 0;
    max-width: var(--content-max-width);
    margin: 0 auto;
}

.page-content h1 {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

.page-content .last-updated {
    color: var(--secondary-text);
    margin-bottom: 40px;
}

.page-content h2 {
    font-size: 1.5rem;
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-md);
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.page-content h3 {
    font-size: 1.15rem;
    margin-top: var(--space-xl);
    margin-bottom: 12px;
    color: var(--accent-color);
}

.page-content p,
.page-content ul {
    color: var(--secondary-text);
    margin-bottom: var(--space-md);
    line-height: 1.7;
}

.page-content ul {
    padding-left: var(--space-lg);
}

.page-content li {
    margin-bottom: var(--space-sm);
}

.page-content strong {
    color: var(--text-color);
}

.page-content code {
    background: var(--card-bg);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.9em;
}

/* === Contact Box === */
.contact-box {
    background: var(--card-bg);
    padding: var(--space-xl);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    margin-top: var(--space-lg);
}

.contact-box a {
    font-size: 1.1rem;
    font-weight: 600;
}

/* === FAQ === */
.faq-item {
    background: var(--card-bg);
    padding: var(--space-lg);
    border-radius: 12px;
    margin-bottom: var(--space-md);
    border: 1px solid var(--border-color);
}

.faq-item h3 {
    color: var(--text-color);
    margin-top: 0;
    margin-bottom: 12px;
}

.faq-item p {
    margin-bottom: 0;
}

/* === User Stories / Testimonials === */
.user-stories {
    padding: var(--space-4xl) 0;
    background: var(--surface-color);
}

.stories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.story-card {
    background: var(--card-bg);
    padding: var(--space-xl);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.story-card blockquote {
    font-size: 1rem;
    color: var(--text-color);
    line-height: 1.7;
    font-style: italic;
    margin-bottom: var(--space-md);
    position: relative;
    padding-left: var(--space-lg);
    border-left: 3px solid var(--accent-color);
}

.story-card .story-author {
    color: var(--secondary-text);
    font-size: 0.85rem;
}

/* === Screenshots (horizontal scroll) === */
.screenshot-scroller {
    display: flex;
    gap: 24px;
    overflow-x: auto;
    padding: 20px 0 32px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.screenshot-scroller::-webkit-scrollbar {
    display: none;
}

.screenshot-scroller img {
    height: 400px;
    width: auto;
    border-radius: var(--border-radius);
    flex-shrink: 0;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* === Footer === */
.site-footer {
    text-align: center;
    padding: var(--space-2xl) 0;
    color: var(--secondary-text);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
}

.site-footer p {
    margin-bottom: 12px;
}

.site-footer a {
    color: var(--secondary-text);
    margin: 0 12px;
}

.site-footer a:hover {
    color: var(--text-color);
}

/* === Skip Link (accessibility) === */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    background: var(--accent-color);
    color: #fff;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    z-index: 200;
    transition: top 0.2s;
}

.skip-link:focus {
    top: var(--space-sm);
}

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

    .site-header .container {
        flex-direction: column;
        gap: var(--space-md);
    }

    .site-nav {
        gap: var(--space-md);
        flex-wrap: wrap;
        justify-content: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .platforms-grid {
        gap: var(--space-xl);
    }

    .page-content {
        padding: var(--space-2xl) 0;
    }

    .page-content h1 {
        font-size: 2rem;
    }

    .stories-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 1.75rem;
    }

    .cta-button {
        padding: 14px 24px;
        font-size: 1rem;
    }

    .step-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}