/* ========================================
   HubOpenAI Download Page - Neubrutalism Style
   ======================================== */

/* CSS Variables */
:root {
    --color-primary: #2563EB;
    --color-primary-dark: #1D4ED8;
    --color-secondary: #3B82F6;
    --color-cta: #F97316;
    --color-cta-hover: #EA580C;
    --color-bg: #F8FAFC;
    --color-bg-card: #FFFFFF;
    --color-text: #1E293B;
    --color-text-light: #64748B;
    --color-border: #E2E8F0;
    --shadow-hard: 4px 4px 0px rgba(30, 41, 59, 1);
    --shadow-hover: 6px 6px 0px rgba(30, 41, 59, 1);
    --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Work Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   Header
   ======================================== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    border-bottom: 2px solid var(--color-border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-primary);
}

.nav {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    transition: var(--transition-smooth);
    position: relative;
}

.nav-link:hover {
    color: var(--color-primary);
}

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

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

/* ========================================
   Hero Section
   ======================================== */
.hero {
    text-align: center;
    padding: 80px 0;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 16px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto 48px;
}

.benefits {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
    margin-top: 48px;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    color: var(--color-text);
}

.benefit-icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
    flex-shrink: 0;
}

/* ========================================
   Download Section
   ======================================== */
.download-section {
    padding: 80px 0;
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: 16px;
    margin: 40px 0;
    box-shadow: var(--shadow-hard);
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(24px, 3vw, 36px);
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    color: var(--color-text);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    padding: 0 24px;
}

.platform-group {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.platform-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text);
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-border);
}

.platform-icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.download-card {
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: 12px;
    padding: 24px;
    transition: var(--transition-smooth);
    position: relative;
}

.download-card:hover {
    transform: translate(-2px, -2px);
    box-shadow: var(--shadow-hover);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.card-icon {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.card-header h4 {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
}

.card-desc {
    font-size: 14px;
    color: var(--color-text-light);
    margin-bottom: 16px;
}

.version-badge {
    display: inline-block;
    background: var(--color-primary);
    color: white;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px 24px;
    background: var(--color-bg-card);
    color: var(--color-text);
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    transition: var(--transition-smooth);
    cursor: pointer;
}

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

.btn-icon {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: white;
}

/* ========================================
   Features Section
   ======================================== */
.features-section {
    padding: 80px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: 12px;
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-hard);
}

.feature-card:hover {
    transform: translate(-2px, -2px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    background: var(--color-bg);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.feature-card h3 {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.5;
}

/* ========================================
   Contact Section
   ======================================== */
.contact-section {
    padding: 80px 0;
}

.contact-card {
    max-width: 500px;
    margin: 0 auto;
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: 16px;
    padding: 48px 32px;
    text-align: center;
    box-shadow: var(--shadow-hard);
    transition: var(--transition-smooth);
}

.contact-card:hover {
    transform: translate(-2px, -2px);
    box-shadow: var(--shadow-hover);
}

.contact-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    background: var(--color-bg);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-icon svg {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

.contact-card h3 {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
}

.contact-card p {
    font-size: 16px;
    color: var(--color-text-light);
    margin-bottom: 24px;
}

.wechat-box {
    background: var(--color-bg);
    border: 2px dashed var(--color-border);
    border-radius: 8px;
    padding: 16px 24px;
    display: inline-block;
}

.wechat-label {
    font-size: 14px;
    color: var(--color-text-light);
    margin-right: 8px;
}

.wechat-id {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.5px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    border-top: 2px solid var(--color-border);
    padding: 32px 0;
    margin-top: 40px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-content p {
    font-size: 14px;
    color: var(--color-text-light);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 14px;
    color: var(--color-text-light);
    text-decoration: none;
    transition: var(--transition-smooth);
}

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

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 16px;
    }

    .nav {
        gap: 24px;
    }

    .benefits {
        flex-direction: column;
        gap: 16px;
        align-items: center;
    }

    .download-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 48px 0;
    }

    .download-section,
    .features-section,
    .contact-section {
        padding: 48px 0;
    }

    .download-grid {
        padding: 0 16px;
    }
}

/* ========================================
   Focus States for Accessibility
   ======================================== */
a:focus,
button:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .download-btn {
        display: none;
    }

    .shadow-hard,
    .shadow-hover {
        box-shadow: none;
    }
}