:root {
    /* Color Scheme */
    --primary: #3b82f6;
    --primary-light: #60a5fa;
    --accent: #ff6b35;
    --background-light: #f8fafc;
    --background-dark: #0a0a0a;
    --surface-light: rgba(255, 255, 255, 0.85);
    --surface-dark: #1a1a1a;
    --text-light: #1a1a1a;
    --text-dark: #ffffff;
    --text-secondary-light: #4a5568;
    --text-secondary-dark: #b0b0b0;
    --border-light: rgba(226, 232, 240, 0.6);
    --border-dark: #333333;

    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    --fs-11: 0.6875rem; /* 11px */
    --fs-12: 0.75rem;   /* 12px */
    --fs-14: 0.875rem;  /* 14px */
    --fs-16: 1rem;      /* 16px */
    --fs-18: 1.125rem;  /* 18px */
    --fs-22: 1.375rem;  /* 22px */
    --fs-28: 1.75rem;   /* 28px */
    --fs-32: 2rem;      /* 32px */
    --fw-normal: 400;
    --fw-medium: 500;
    --fw-semibold: 600;
    --fw-bold: 700;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 20px;
    --space-xxl: 24px;
    --space-xxxl: 32px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;

    /* Shadows */
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-dark: 0 4px 6px rgba(0, 0, 0, 0.2), 0 1px 3px rgba(0, 0, 0, 0.3);
}

[data-theme='light'] {
    --background: var(--background-light);
    --surface: var(--surface-light);
    --text-primary: var(--text-light);
    --text-secondary: var(--text-secondary-light);
    --border: var(--border-light);
    --shadow: var(--shadow-light);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
}

[data-theme='dark'] {
    --background: var(--background-dark);
    --surface: var(--surface-dark);
    --text-primary: var(--text-dark);
    --text-secondary: var(--text-secondary-dark);
    --border: var(--border-dark);
    --shadow: var(--shadow-dark);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

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

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--fw-bold);
    line-height: 1.2;
    margin-bottom: var(--space-lg);
}

h1 { font-size: var(--fs-32); }
h2 { font-size: var(--fs-28); }
h3 { font-size: var(--fs-22); }
p {
    font-size: var(--fs-16);
    margin-bottom: var(--space-lg);
    color: var(--text-secondary);
}

ul {
    list-style-position: inside;
    padding-left: var(--space-md);
}

.container {
    width: 100%;
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-xl);
    padding-right: var(--space-xl);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.05);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
    transition: background-color var(--transition-fast);
}

.header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: var(--fs-22);
    font-weight: var(--fw-bold);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.logo-img {
    height: 40px;
    width: auto;
    transition: transform var(--transition-fast);
}

.logo-text {
    font-size: var(--fs-22);
    font-weight: var(--fw-bold);
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.logo:hover .logo-img {
    transform: scale(1.05);
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xxl);
}

.nav-links a {
    font-size: var(--fs-16);
    font-weight: var(--fw-medium);
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    padding: var(--space-sm);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--surface);
    color: var(--text-primary);
}

.theme-toggle .moon { display: none; }
.theme-toggle .sun { display: block; }
[data-theme='dark'] .theme-toggle .moon { display: block; }
[data-theme='dark'] .theme-toggle .sun { display: none; }


/* Main Content */
main {
    padding-top: 70px; /* Header height */
}

/* Hero Section */
.hero {
    padding: 100px 0;
    text-align: center;
    background: radial-gradient(ellipse at bottom, var(--primary-light) 0%, transparent 50%);
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: var(--space-lg);
}

.hero-content p {
    font-size: var(--fs-18);
    max-width: 600px;
    margin: 0 auto var(--space-xxl);
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.btn {
    padding: var(--space-md) var(--space-xxl);
    border-radius: var(--radius-md);
    font-weight: var(--fw-semibold);
    font-size: var(--fs-16);
    transition: transform var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
    border: 1px solid transparent;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

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

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

.btn-secondary {
    background-color: var(--surface);
    color: var(--text-primary);
    border-color: var(--border);
}

.btn-secondary:hover {
    background-color: var(--border);
}

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

.features h2 {
    text-align: center;
    margin-bottom: var(--space-xxxl);
}

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

.card {
    background-color: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xxl);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
    [data-theme='dark'] & {
        box-shadow: 0 8px 15px rgba(0, 0, 0, 0.3);
    }
}

.card h3 {
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

/* Footer */
.footer {
    padding: var(--space-xxxl) 0;
    border-top: 1px solid var(--border);
    margin-top: 50px;
}

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

.footer p {
    margin: 0;
    font-size: var(--fs-14);
}

.footer-links {
    display: flex;
    gap: var(--space-xl);
}

.footer-links a {
    font-size: var(--fs-14);
    color: var(--text-secondary);
}

/* Support & Privacy Pages */
.page-header {
    padding: 60px 0;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.page-header h1 {
    font-size: 2.5rem;
}

.support-content .container,
.privacy-content .container {
    padding-top: 50px;
    padding-bottom: 50px;
}

.content-card {
    margin-bottom: var(--space-xxl);
}

.content-card h2 {
    border-bottom: 1px solid var(--border);
    padding-bottom: var(--space-md);
    margin-bottom: var(--space-xl);
}
.content-card h3 {
    margin-top: var(--space-xl);
}

.content-card ul {
    margin-top: var(--space-md);
    margin-bottom: var(--space-lg);
}

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

/* Mobile Navigation */
.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.mobile-nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 5px 0;
    transition: all var(--transition-fast);
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: 0;
        height: 100vh;
        width: 250px;
        background-color: var(--surface);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transform: translateX(100%);
        transition: transform 0.3s ease-in-out;
        box-shadow: -5px 0 15px rgba(0,0,0,0.1);
        padding-top: 70px;
    }

    .nav-links.active {
        transform: translateX(0);
    }

    .mobile-nav-toggle {
        display: block;
    }

    .mobile-nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    .mobile-nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    .mobile-nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

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