/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #007AFF;
    --primary-dark: #0055CC;
    --accent: #AF52DE;
    --text: #FFFFFF;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);
    --bg: #000000;
    --bg-elevated: #1C1C1E;
    --bg-card: rgba(255, 255, 255, 0.05);
    --border: rgba(255, 255, 255, 0.1);
    --success: #30D158;
    --error: #FF453A;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: system-ui, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

/* Animated gradient background */
.gradient-bg {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 20% 50%, rgba(0, 122, 255, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(175, 82, 222, 0.15) 0%, transparent 50%);
    animation: gradientShift 20s ease infinite;
    pointer-events: none;
    z-index: -1;
}

@keyframes gradientShift {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(-5%, -5%); }
}

/* Navigation */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
}

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

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

.nav-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.nav-cta {
    padding: 8px 20px;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: background 0.2s, transform 0.2s;
}

.nav-cta:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* Hero */
.hero {
    padding: 120px 0 80px;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 32px;
    color: var(--text-secondary);
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    color: var(--text-secondary);
    margin-bottom: 48px;
    line-height: 1.5;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    box-shadow: 0 8px 24px rgba(0, 122, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 122, 255, 0.4);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
}

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

.btn-large {
    padding: 20px 40px;
    font-size: 1.125rem;
}

.hero-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Section styles */
section {
    padding: 80px 0;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 64px;
}

/* Problem section */
.problem {
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-top: 64px;
}

.problem-card {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    text-align: center;
}

.problem-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    filter: grayscale(1) opacity(0.7);
}

.problem-card h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
    color: var(--error);
}

.problem-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Solution section */
.solution {
    background: var(--bg);
}

.solution-intro {
    margin-bottom: 64px;
}

.feature-showcase {
    display: flex;
    flex-direction: column;
    gap: 48px;
}

.feature-large {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    padding: 48px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 24px;
}

.feature-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.encryption-demo {
    text-align: center;
}

.key-icon {
    font-size: 4rem;
    margin-bottom: 24px;
    animation: pulse 2s ease infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.encryption-flow {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.flow-step {
    padding: 12px 16px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    white-space: nowrap;
}

.flow-step.encrypted {
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.2), rgba(175, 82, 222, 0.2));
    border-color: var(--primary);
    color: var(--primary);
    font-weight: 600;
}

.flow-arrow {
    color: var(--text-tertiary);
    font-size: 1.5rem;
}

.feature-content h3 {
    font-size: 2rem;
    margin-bottom: 16px;
}

.feature-content p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: 24px;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 8px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 28px;
}

.feature-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.feature-card {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    transition: transform 0.3s, border-color 0.3s;
}

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

.feature-icon-large {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.feature-card h4 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

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

/* Manifesto section */
.manifesto {
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.1), rgba(175, 82, 222, 0.1));
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.manifesto-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: 64px;
}

.manifesto-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 48px;
}

.manifesto-item {
    text-align: center;
}

.manifesto-number {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.manifesto-item h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.manifesto-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Comparison section */
.comparison {
    background: var(--bg);
}

.comparison-table {
    max-width: 800px;
    margin: 64px auto 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}

.comparison-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    border-bottom: 1px solid var(--border);
}

.comparison-row:last-child {
    border-bottom: none;
}

.comparison-header {
    background: var(--bg-elevated);
    font-weight: 700;
}

.comparison-cell {
    padding: 20px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.comparison-cell.feature-name {
    justify-content: flex-start;
    text-align: left;
}

.comparison-cell.highlight {
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.1), rgba(175, 82, 222, 0.1));
    color: var(--primary);
    font-weight: 600;
}

/* CTA section */
.cta {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    padding: 120px 0;
}

.cta-content {
    text-align: center;
}

.cta-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: 16px;
}

.cta-subtitle {
    font-size: 1.5rem;
    margin-bottom: 48px;
    opacity: 0.9;
}

.cta-note {
    margin-top: 24px;
    font-size: 1rem;
    opacity: 0.8;
}

/* Footer */
.footer {
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
    padding: 64px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
}

.footer-title {
    font-size: 1.5rem;
    font-weight: 700;
}

.footer-tagline {
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-col h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

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

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-copyright,
.footer-motivation {
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* Responsive design */
@media (max-width: 968px) {
    .feature-large {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

    .comparison-table {
        font-size: 0.875rem;
    }

    .comparison-cell {
        padding: 16px 8px;
    }
}

@media (max-width: 640px) {
    .hero {
        padding: 80px 0 60px;
    }

    .hero-stats {
        gap: 32px;
    }

    .stat-value {
        font-size: 2rem;
    }

    section {
        padding: 60px 0;
    }

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

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

    .encryption-flow {
        flex-direction: column;
    }

    .flow-arrow {
        transform: rotate(90deg);
    }
}