/**
 * offthegoop.cloud - Main Stylesheet
 * Optimized for performance, accessibility, and maintainability
 */

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

/* ===== CSS Variables ===== */
:root {
    /* Color scheme */
    --color-background: #08090A;
    --color-surface: #0B0D0E;
    --color-surface-variant: #101214;
    --color-primary: #0066cc;
    --color-primary-hover: #0055aa;
    --color-secondary: #5c7fee;
    --color-accent: #00c2ff;

    /* Text colors */
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #DADADA;
    --color-text-muted: #7F7F7F;

    /* UI elements */
    --color-border: #222222;
    --color-surface-overlay: rgba(11, 13, 14, 0.9);
    --color-header-bg: rgba(8, 9, 10, 0.85);

    /* Typography */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    --font-size-xs: 0.75rem;   /* 12px */
    --font-size-sm: 0.875rem;  /* 14px */
    --font-size-md: 1rem;      /* 16px */
    --font-size-lg: 1.125rem;  /* 18px */
    --font-size-xl: 1.25rem;   /* 20px */
    --font-size-2xl: 1.5rem;   /* 24px */
    --font-size-3xl: 1.875rem; /* 30px */
    --font-size-4xl: 2.25rem;  /* 36px */

    /* Font weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Spacing */
    --spacing-xxs: 0.25rem;    /* 4px */
    --spacing-xs: 0.5rem;      /* 8px */
    --spacing-sm: 0.75rem;     /* 12px */
    --spacing-md: 1rem;        /* 16px */
    --spacing-lg: 1.5rem;      /* 24px */
    --spacing-xl: 2rem;        /* 32px */
    --spacing-2xl: 3rem;       /* 48px */
    --spacing-3xl: 4rem;       /* 64px */

    /* Border radius */
    --radius-sm: 0.25rem;     /* 4px */
    --radius-md: 0.5rem;      /* 8px */
    --radius-lg: 1rem;        /* 16px */
    --radius-xl: 1.5rem;      /* 24px */
    --radius-2xl: 2rem;       /* 32px */
    --radius-full: 9999px;    /* Pill shape */

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.18);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.24);

    /* Z-index layers */
    --z-base: 1;
    --z-above: 10;
    --z-header: 100;
    --z-modal: 1000;
    --z-toast: 2000;

    /* Container widths */
    --width-container: 1200px;
    --width-container-narrow: 900px;
}

/* Dark theme variant (can be toggled via JS) */
[data-theme="dark"] {
    --color-background: #050607;
    --color-surface: #0A0B0D;
    --color-surface-variant: #0C0E10;
}

/* ===== Base Styles ===== */
html {
    scroll-behavior: smooth;
    font-size: 16px;
    height: 100%;
}

body {
    background-color: var(--color-background);
    color: var(--color-text-primary);
    font-family: var(--font-family-base);
    line-height: 1.6;
    min-height: 100%;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    opacity: 0;
}

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

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

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

/* Smooth scrollbar for webkit browsers */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background-color: var(--color-background);
}

::-webkit-scrollbar-thumb {
    background-color: #333;
    border-radius: 6px;
    border: 3px solid var(--color-background);
}

::-webkit-scrollbar-thumb:hover {
    background-color: #444;
}

/* Text selection */
::selection {
    background-color: rgba(100, 100, 100, 0.25);
    color: var(--color-text-primary);
}

/* ===== Accessibility ===== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.skip-to-content {
    position: absolute;
    top: -100px;
    left: 0;
    z-index: var(--z-toast);
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-md);
    transition: top var(--transition-fast);
}

.skip-to-content:focus {
    top: 0;
}

/* Focus styles for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===== Animation Definitions ===== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

@keyframes slideInUp {
    from { transform: translateY(30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes slideInLeft {
    from { transform: translateX(-30px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes slideInRight {
    from { transform: translateX(30px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* Applied animation classes */
.fade-in {
    animation: fadeIn var(--transition-slow) forwards;
}

.fade-out {
    animation: fadeOut var(--transition-normal) forwards;
}

/* ===== Layout Components ===== */
/* Header styles */
.header-container {
    position: fixed;
    top: 1.25rem;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: var(--width-container);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    background-color: var(--color-header-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-full);
    z-index: var(--z-header);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.header-scrolled {
    top: 0.625rem;
    background-color: rgba(8, 10, 8, 0.95);
    box-shadow: var(--shadow-lg);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo {
    width: 1.5rem;
    height: 1.5rem;
    object-fit: contain;
}

.header-title {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

/* Main navigation */
.nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav a {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: 0.5rem 0.875rem;
    border-radius: var(--radius-md);
    position: relative;
    transition: color var(--transition-normal);
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: width var(--transition-normal), left var(--transition-normal);
    transform-origin: center;
}

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

.nav a:hover::after, .nav a.active::after {
    width: 60%;
    left: 20%;
}

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-size: var(--font-size-xl);
    cursor: pointer;
    padding: 0.5rem;
    margin-left: 0.5rem;
    transition: color var(--transition-normal);
}

.menu-toggle:hover {
    color: var(--color-accent);
}

/* Main content container */
main {
    max-width: var(--width-container);
    margin: 0 auto;
    padding: 7.5rem var(--spacing-xl) var(--spacing-2xl);
}

/* ===== Hero Section ===== */
.hero {
    text-align: center;
    padding: var(--spacing-xl) 0 var(--spacing-3xl);
    position: relative;
}

.main-text {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.caption-text {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-muted);
    max-width: 650px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.5;
}

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

.hero-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: var(--font-size-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-medium);
}

/* ===== Partners Showcase ===== */
.partners-showcase {
    position: relative;
    padding: var(--spacing-lg) 0;
    margin: var(--spacing-2xl) 0;
    overflow: hidden;
}

.partners-wrapper {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin: 0 auto;
    flex-wrap: nowrap;
    animation: scrollPartners 20s linear infinite;
}

.partner-item {
    width: 6rem;
    height: 6rem;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.4;
    filter: grayscale(1);
    transition: all var(--transition-normal);
}

.partner-item:hover {
    opacity: 1;
    filter: grayscale(0);
    transform: scale(1.1);
}

@keyframes scrollPartners {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ===== Section Components ===== */
.section-label {
    display: inline-block;
    background-color: var(--color-surface);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-secondary);
}

.services-section, .features-section {
    text-align: center;
    margin: var(--spacing-3xl) 0;
    padding: var(--spacing-lg) 0;
}

/* ===== App Selection Cards ===== */
.app-selection {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
    margin: var(--spacing-xl) 0 var(--spacing-3xl);
}

.app-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.app-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent 0%, transparent 50%, rgba(255, 255, 255, 0.03) 100%);
    transition: opacity var(--transition-normal);
    opacity: 0;
    z-index: 1;
}

.app-card:hover {
    transform: translateY(-7px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(255, 255, 255, 0.15);
}

.app-card:hover::before {
    opacity: 1;
}

.app-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.app-icon img {
    width: 45px;
    height: 45px;
    object-fit: contain;
}

.app-card:hover .app-icon {
    transform: scale(1.05);
    background-color: rgba(255, 255, 255, 0.1);
}

.app-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-normal);
    color: var(--color-text-primary);
}

.app-title.hover {
    transform: scale(1.05);
    color: var(--color-text-primary);
}

.app-description {
    font-size: var(--font-size-md);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
    flex-grow: 1;
    max-width: 90%;
    line-height: 1.5;
}

.app-button {
    background-color: var(--color-primary);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: auto;
    z-index: 2;
}

.app-button:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
    color: white;
}

/* Custom colors for different app cards - NEW ADDITION */
.app-card:nth-child(3) .app-icon {
    background-color: rgba(0, 194, 255, 0.08);
}

.app-card:nth-child(4) .app-icon {
    background-color: rgba(92, 127, 238, 0.08);
}

.app-card:nth-child(5) .app-icon {
    background-color: rgba(0, 177, 106, 0.08);
}

.app-card:nth-child(6) .app-icon {
    background-color: rgba(255, 123, 0, 0.08);
}

/* ===== Features Grid ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.feature-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    font-size: var(--font-size-xl);
    color: var(--color-accent);
    transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
    background-color: rgba(255, 255, 255, 0.1);
}

.feature-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.feature-description {
    font-size: var(--font-size-md);
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* ===== FAQ Section ===== */
.faq-section {
    margin: var(--spacing-3xl) 0;
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.faq-container {
    max-width: var(--width-container-narrow);
    margin: var(--spacing-xl) auto 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.faq-item {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-lg);
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.faq-question:hover {
    color: var(--color-text-primary);
}

.faq-toggle-icon {
    position: relative;
    width: 16px;
    height: 16px;
}

.faq-toggle-icon::before,
.faq-toggle-icon::after {
    content: '';
    position: absolute;
    background-color: var(--color-text-muted);
    transition: all var(--transition-normal);
}

.faq-toggle-icon::before {
    top: 50%;
    left: 0;
    width: 16px;
    height: 2px;
    transform: translateY(-50%);
}

.faq-toggle-icon::after {
    top: 0;
    left: 50%;
    height: 16px;
    width: 2px;
    transform: translateX(-50%);
}

.faq-item.active .faq-toggle-icon::after {
    transform: translateX(-50%) rotate(90deg);
    opacity: 0;
}

.faq-item.active .faq-toggle-icon::before {
    background-color: var(--color-primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    padding: 0 var(--spacing-lg);
    color: var(--color-text-muted);
    text-align: left;
    transition: all var(--transition-normal);
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.faq-item.active {
    box-shadow: var(--shadow-md);
}

.faq-item.active .faq-question {
    color: var(--color-text-primary);
}

/* ===== CTA Section ===== */
.cta-section {
    background-color: var(--color-surface-variant);
    border-radius: var(--radius-xl);
    margin: var(--spacing-3xl) 0;
    padding: var(--spacing-2xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
}

.cta-content {
    flex: 1;
}

.cta-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.cta-text {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.cta-button {
    background-color: var(--color-primary);
}

.cta-button-secondary {
    background-color: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

.cta-image {
    flex: 0 0 40%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.cta-image img {
    max-width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* ===== Footer ===== */
.site-footer {
    background-color: var(--color-surface-variant);
    color: var(--color-text-secondary);
    padding-top: var(--spacing-2xl);
}

.footer-content {
    max-width: var(--width-container);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--spacing-2xl);
}

.footer-branding {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    width: 2rem;
    height: 2rem;
}

.footer-company {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2xl);
}

.footer-column {
    min-width: 160px;
}

.footer-heading {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.footer-list {
    list-style: none;
    padding: 0;
}

.footer-list li {
    margin-bottom: var(--spacing-sm);
}

.footer-list a {
    color: var(--color-text-muted);
    transition: color var(--transition-normal);
    font-size: var(--font-size-sm);
}

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

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--color-text-muted);
    transition: all var(--transition-normal);
}

.social-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-text-primary);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) var(--spacing-xl);
    margin-top: var(--spacing-2xl);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-md);
}

.footer-legal a {
    color: var(--color-text-muted);
    transition: color var(--transition-normal);
}

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

/* Animation for revealing elements */
.section-label, .section-title, .app-card,
.feature-card, .faq-item, .cta-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.section-label.reveal, .section-title.reveal, .app-card.reveal,
.feature-card.reveal, .faq-item.reveal, .cta-section.reveal {
    opacity: 1;
    transform: translateY(0);
}

/* ===== App Selection Grid Layout - NEW ADDITION ===== */
@media (min-width: 1200px) {
    .app-selection {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xl);
        max-width: var(--width-container);
        margin: var(--spacing-xl) auto var(--spacing-3xl);
    }

    .app-card {
        width: 100%;
        max-width: none;
    }
}

/* ===== App Card Staggered Reveal Animation - NEW ADDITION ===== */
.app-card:nth-child(1) { transition-delay: 0ms; }
.app-card:nth-child(2) { transition-delay: 100ms; }
.app-card:nth-child(3) { transition-delay: 200ms; }
.app-card:nth-child(4) { transition-delay: 300ms; }
.app-card:nth-child(5) { transition-delay: 400ms; }
.app-card:nth-child(6) { transition-delay: 500ms; }

/* ===== Responsive Styles ===== */
/* Large desktop (1440px and up) */
@media (min-width: 90em) {
    .header-container {
        padding: var(--spacing-sm) var(--spacing-xl);
    }

    .header-title {
        font-size: var(--font-size-lg);
    }

    .nav a {
        font-size: var(--font-size-md);
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .main-text {
        font-size: var(--font-size-4xl);
    }
}

/* Small/Medium desktop (992px - 1439px) */
@media (min-width: 62em) and (max-width: 89.9375em) {
    .app-card {
        max-width: 360px;
    }

    /* NEW ADDITION - Two column layout for medium screens */
    .app-selection {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Tablet (768px - 991px) */
@media (min-width: 48em) and (max-width: 61.9375em) {
    .header-container {
        width: 95%;
        padding: var(--spacing-xs) var(--spacing-lg);
    }

    .main-text {
        font-size: var(--font-size-3xl);
    }

    .caption-text {
        font-size: var(--font-size-md);
        max-width: 90%;
    }

    .app-selection {
        gap: var(--spacing-md);
    }

    .app-card {
        max-width: 340px;
    }

    .cta-section {
        flex-direction: column;
        padding: var(--spacing-xl);
    }

    .cta-image {
        order: -1;
        margin-bottom: var(--spacing-lg);
    }

    .footer-content {
        gap: var(--spacing-xl);
    }
}

/* Mobile (up to 767px) */
@media (max-width: 47.9375em) {
    .header-container {
        top: 0.625rem;
        width: 95%;
        padding: var(--spacing-xs) var(--spacing-md);
        border-radius: var(--radius-2xl);
    }

    .logo {
        width: 1.25rem;
        height: 1.25rem;
    }

    .header-title {
        font-size: var(--font-size-sm);
    }

    .menu-toggle {
        display: block;
    }

    .nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--color-surface-overlay);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: center;
        gap: var(--spacing-xl);
        visibility: hidden;
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition-normal);
        z-index: var(--z-modal);
    }

    .nav.mobile-shown {
        visibility: visible;
        opacity: 1;
        pointer-events: auto;
    }

    .nav a {
        font-size: var(--font-size-xl);
    }

    main {
        padding: 5.5rem var(--spacing-md) var(--spacing-xl);
    }

    .main-text {
        font-size: var(--font-size-2xl);
        max-width: 100%;
        padding: 0 var(--spacing-xs);
    }

    .caption-text {
        font-size: var(--font-size-md);
        max-width: 100%;
        padding: 0 var(--spacing-xs);
        margin-bottom: var(--spacing-lg);
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

    .app-selection {
        flex-direction: column;
        align-items: center;
    }

    .app-card {
        width: 100%;
    }

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

    .faq-container {
        width: 100%;
    }

    .cta-section {
        flex-direction: column;
        padding: var(--spacing-lg);
    }

    .cta-image {
        order: -1;
        margin-bottom: var(--spacing-lg);
    }

    .cta-title {
        font-size: var(--font-size-xl);
    }

    .cta-text {
        font-size: var(--font-size-md);
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-xl);
    }

    .footer-links {
        width: 100%;
        justify-content: space-between;
    }

    .footer-column {
        min-width: 0;
        width: 45%;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: var(--spacing-md);
    }
}

/* Small mobile (up to 480px) */
@media (max-width: 30em) {
    .header-container {
        width: 100%;
        border-radius: 0;
        top: 0;
    }

    .nav a {
        font-size: var(--font-size-lg);
    }

    .logo {
        width: 1.125rem;
        height: 1.125rem;
    }

    .main-text {
        font-size: var(--font-size-xl);
    }

    .caption-text {
        font-size: var(--font-size-sm);
    }

    .section-label {
        font-size: var(--font-size-xs);
        padding: 0.625rem 1.25rem;
    }

    .section-title {
        font-size: var(--font-size-xl);
    }

    .cta-buttons {
        flex-direction: column;
        width: 100%;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-xl);
    }

    .footer-column {
        width: 100%;
    }

    .footer-social {
        width: 100%;
        justify-content: space-between;
    }
}

.site-header {
    background-color: #fff;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.return-home a {
    text-decoration: none;
    color: #007aff;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
}

.return-home a:hover {
    color: #0056b3;
}

.return-home a i {
    font-size: 16px;
}

.app-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: #1d1d1f;
}

.app-logo {
    display: flex;
    align-items: center;
}

.app-logo img {
    width: 40px;
    height: auto;
    object-fit: contain;
}

@media (max-width: 600px) {
    .site-header {
        padding: 0.75rem 1rem;
    }

    .app-title {
        font-size: 1rem;
    }

    .app-logo img {
        width: 32px;
    }
}