:root {
    --bg-color: #ffffff;
    --text-color: #1d1d1f;
    --text-secondary: #86868b;
    --accent-color: #0071e3;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.4);
    --container-width: 980px;
    --border-radius: 20px;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.47;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    background-image: 
        radial-gradient(at 0% 0%, rgba(0, 113, 227, 0.01) 0, transparent 40%), 
        radial-gradient(at 100% 100%, rgba(66, 184, 131, 0.01) 0, transparent 40%);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Floating Island Navigation */
.glass-nav {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
    min-width: 580px;
    height: 52px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 999px;
    z-index: 1000;
    box-shadow: 0 8px 32px rgba(0,0,0,0.04);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 0.82rem;
    font-weight: 500;
    transition: opacity 0.2s;
}

.nav-links a:hover {
    opacity: 0.6;
}

.btn-disabled-nav {
    background: #f5f5f7;
    padding: 5px 12px;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Hero Section */
.hero {
    padding-top: 180px;
    padding-bottom: 120px;
    text-align: center;
}

h1 {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.05;
    margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, #0071e3 0%, #42b883 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subheadline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 48px;
    font-weight: 400;
    line-height: 1.5;
}

.app-btn-container {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.btn {
    padding: 10px 22px;
    border-radius: 14px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    border: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-app {
    background: #000;
    color: #fff;
    min-width: 170px;
}

.btn-app:hover {
    transform: scale(1.02);
}

.btn-icon {
    font-size: 22px;
    display: flex;
    align-items: center;
}

.btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.1;
}

.btn-text .small {
    font-size: 0.65rem;
    font-weight: 400;
    margin-bottom: 2px;
    opacity: 0.8;
}

.btn-text .large {
    font-size: 1rem;
    font-weight: 600;
}

/* Features */
.features {
    padding: 120px 0;
    background: #f5f5f7; /* Slightly deeper gray for better card contrast */
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-header h2 {
    font-size: 2.8rem;
    font-weight: 800;
    max-width: 650px;
    margin: 0 auto 16px;
    letter-spacing: -0.04em;
    line-height: 1.1;
}

.section-header p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 580px;
    margin: 0 auto;
    line-height: 1.5;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.feature-card {
    padding: 56px;
    border-radius: 28px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.7);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.feature-card:hover {
    transform: translateY(-6px);
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.06);
}

.feature-icon {
    margin-bottom: 24px;
    color: var(--accent-color);
}

.feature-icon svg {
    width: 36px;
    height: 36px;
}

.feature-card h3 {
    margin-bottom: 12px;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.5;
}

/* Privacy Section Refinement */
.privacy-focus {
    padding: 120px 0;
}

.privacy-content {
    padding: 80px 60px;
    border-radius: 40px;
    background: #fbfbfd;
    border: 1px solid rgba(0,0,0,0.03);
    text-align: center;
}

.privacy-title {
    font-size: 3.2rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--text-color);
}

.privacy-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto 48px;
    line-height: 1.6;
}

.privacy-badges {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.badge-v3 {
    padding: 8px 18px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid rgba(0,0,0,0.08);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.02);
}

/* Footer */
footer {
    padding: 60px 0;
    border-top: 1px solid #f2f2f7;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

.author-mention p {
    color: var(--text-secondary);
}

.author-mention a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 600;
}

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

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

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }

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

/* Responsive */
@media (max-width: 768px) {
    .glass-nav {
        width: 90%;
        min-width: unset;
    }
    .feature-grid {
        grid-template-columns: 1fr;
    }
    h1 { font-size: 2.8rem; }
    .privacy-title { font-size: 2.4rem; }
    .privacy-content { padding: 60px 24px; }
}