:root {
    /* Ring4-inspired Clean Palette */
    --primary-color: #0ea5e9;
    --primary-dark: #0284c7;
    --primary-light: #e0f2fe;
    --accent-gradient: linear-gradient(135deg, #0ea5e9 0%, #38bdf8 100%);

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-light: #94a3b8;

    --bg-page: #ffffff;
    --bg-section: #f8fafc;
    --bg-card: #ffffff;

    /* Effects */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-colored: 0 10px 25px -5px rgba(14, 165, 233, 0.25);

    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    color: var(--text-secondary);
    background-color: var(--bg-page);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.2;
}

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

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 1.15rem;
    color: var(--text-secondary);
}

/* Navbar */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
}

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

.logo span {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 40px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.3s;
}

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

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    padding: 12px 32px;
    border-radius: 9999px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-colored);
    display: inline-block;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px -5px rgba(14, 165, 233, 0.4);
}

.btn-large {
    padding: 16px 48px;
    font-size: 1.1rem;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

/* Hero Section */
.hero {
    padding-top: 180px;
    padding-bottom: 80px;
    background: linear-gradient(180deg, var(--bg-page) 0%, var(--bg-section) 100%);
    text-align: center;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.hero p {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 48px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* Benefits Section */
.benefits {
    padding: 80px 0;
    background: var(--bg-page);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.benefit-card {
    text-align: center;
    padding: 40px 20px;
}

.benefit-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-light);
    border-radius: 50%;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary-color);
}

.benefit-card h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.benefit-card p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.6;
}

/* Use Cases Section */
.use-cases {
    padding: 100px 0;
    background: var(--bg-section);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.use-case-card {
    background: var(--bg-card);
    padding: 40px;
    border-radius: 16px;
    border: 1px solid rgba(226, 232, 240, 0.8);
    transition: all 0.3s ease;
}

.use-case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.use-case-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-light);
    border-radius: 12px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.use-case-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.use-case-card p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

/* Pricing Section */
.pricing {
    padding: 100px 0;
    background: var(--bg-page);
}

.pricing-card {
    max-width: 500px;
    margin: 0 auto;
    background: var(--bg-card);
    border-radius: 20px;
    border: 2px solid var(--primary-light);
    padding: 48px;
    box-shadow: var(--shadow-lg);
}

.pricing-header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
}

.pricing-header h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.price-amount {
    font-size: 4rem;
    font-weight: 800;
    color: var(--text-primary);
}

.price-period {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.billing-note {
    margin-top: 12px;
    font-size: 0.95rem;
    color: var(--text-light);
}

.pricing-features h4 {
    font-size: 1.1rem;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.pricing-features ul {
    list-style: none;
    margin-bottom: 32px;
}

.pricing-features li {
    padding: 12px 0;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 12px;
}

.pricing-features li i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

.trial-note {
    text-align: center;
    margin-top: 16px;
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Download Section */
.download {
    padding: 100px 0;
    text-align: center;
    background: var(--bg-section);
}

.download h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.download p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.store-badges {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.store-btn {
    background: var(--text-primary);
    color: white;
    padding: 14px 28px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.store-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    background: #000;
}

.store-text {
    text-align: left;
}

.store-text span:first-child {
    font-size: 0.7rem;
    display: block;
    opacity: 0.8;
}

.store-text span:last-child {
    font-size: 1.1rem;
    font-weight: 700;
}

/* Footer */
.footer {
    background-color: var(--text-primary);
    color: var(--text-light);
    padding: 80px 0 32px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-column h4 {
    margin-bottom: 24px;
    color: white;
    font-size: 1.1rem;
}

.footer-column ul {
    list-style: none;
}

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

.footer-column a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s;
    font-size: 0.95rem;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 900px) {
    .hero h1 {
        font-size: 3rem;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 600px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding-top: 140px;
    }

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

    .section-header h2 {
        font-size: 2rem;
    }

    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    .pricing-card {
        padding: 32px 24px;
    }

    .price-amount {
        font-size: 3rem;
    }

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

    .store-badges {
        flex-direction: column;
        align-items: center;
    }
}