/* ===== CSS VARIABLES ===== */
:root {
    /* Colors - Ocean-inspired palette */
    --color-primary: hsl(200, 85%, 45%);
    --color-primary-dark: hsl(200, 85%, 35%);
    --color-primary-light: hsl(200, 85%, 55%);
    --color-secondary: hsl(190, 70%, 50%);
    --color-accent: hsl(45, 95%, 60%);

    --color-bg-dark: hsl(210, 30%, 8%);
    --color-bg-medium: hsl(210, 25%, 12%);
    --color-bg-light: hsl(210, 20%, 16%);
    --color-bg-card: hsl(210, 22%, 14%);

    --color-text-primary: hsl(0, 0%, 98%);
    --color-text-secondary: hsl(210, 15%, 75%);
    --color-text-muted: hsl(210, 10%, 60%);

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

    /* Typography */
    --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 3rem;

    /* Effects */
    --border-radius-sm: 0.5rem;
    --border-radius-md: 1rem;
    --border-radius-lg: 1.5rem;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(23, 162, 184, 0.3);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg-dark);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== LAYOUT ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== HEADER & NAVIGATION ===== */
.header {
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    background: rgba(17, 24, 39, 0.8);
    backdrop-filter: blur(10px);
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary-light);
    text-decoration: none;
    transition: transform var(--transition-fast);
}

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

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

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

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

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

/* ===== MAIN CONTENT ===== */
.main-content {
    flex: 1;
    padding: var(--spacing-xl) 0;
}

/* ===== HERO SECTION ===== */
.hero-section {
    text-align: center;
    animation: fadeInUp 0.8s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-light);
    letter-spacing: -0.02em;
    animation: titleGlow 3s ease-in-out infinite;
}

@keyframes titleGlow {

    0%,
    100% {
        filter: drop-shadow(0 0 20px rgba(23, 162, 184, 0.3));
    }

    50% {
        filter: drop-shadow(0 0 40px rgba(23, 162, 184, 0.5));
    }
}

.subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    font-weight: 300;
}

.description {
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    line-height: 1.8;
}

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

/* ===== DOWNLOAD SECTION ===== */
.download-section {
    margin-top: var(--spacing-2xl);
}

.download-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
    font-weight: 600;
}

.qr-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    max-width: 700px;
    margin: 0 auto;
}

.qr-card {
    background: var(--color-bg-card);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.qr-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(23, 162, 184, 0.08);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.qr-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: rgba(23, 162, 184, 0.3);
}

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

.qr-placeholder {
    width: 200px;
    height: 200px;
    margin: 0 auto var(--spacing-md);
    background: var(--color-bg-light);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed rgba(255, 255, 255, 0.2);
    transition: all var(--transition-normal);
    position: relative;
}

.qr-placeholder svg {
    width: 80px;
    height: 80px;
    opacity: 0.5;
    transition: all var(--transition-normal);
}

.qr-placeholder.android svg {
    color: var(--color-secondary);
}

.qr-placeholder.ios svg {
    color: var(--color-primary-light);
}

.qr-card:hover .qr-placeholder {
    border-color: rgba(23, 162, 184, 0.5);
    background: var(--color-bg-medium);
}

.qr-card:hover .qr-placeholder svg {
    opacity: 1;
    transform: scale(1.1);
}

.qr-label {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.qr-text {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ===== PRIVACY PAGE ===== */
.privacy-content {
    max-width: 800px;
    margin: 0 auto;
}

.privacy-section {
    animation: fadeInUp 0.8s ease;
}

.page-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-primary-light);
}

.privacy-intro {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--color-primary);
}

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

.section-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-light);
}

.info-card {
    background: var(--color-bg-card);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-normal);
}

.info-card:hover {
    border-color: rgba(23, 162, 184, 0.3);
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.privacy-list {
    list-style: none;
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-md);
}

.privacy-list li {
    margin-bottom: var(--spacing-sm);
    position: relative;
    padding-left: var(--spacing-md);
}

.privacy-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.note {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: rgba(23, 162, 184, 0.1);
    border-radius: var(--border-radius-sm);
    border-left: 3px solid var(--color-primary);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.privacy-footer {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.last-updated {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-style: italic;
}

/* ===== FOOTER ===== */
.footer {
    padding: var(--spacing-xl) 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: var(--spacing-2xl);
}

.footer p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.footer-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .header {
        padding: var(--spacing-md) 0;
    }

    .nav {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .qr-container {
        grid-template-columns: 1fr;
    }

    .qr-placeholder {
        width: 180px;
        height: 180px;
    }

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

/* ===== UTILITY CLASSES ===== */
.text-center {
    text-align: center;
}

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

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