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

html {
    scroll-behavior: smooth;
}

:root {
    --gradient-start: #4FC3F7;
    --gradient-end: #1976D2;
    --gradient-light: linear-gradient(135deg, #4FC3F7 0%, #1976D2 100%);
    --gradient-vertical: linear-gradient(180deg, #ffffff 0%, #f5f7fa 100%);
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --bg-white: #ffffff;
    --bg-surface: #f7f7f7;
    --bg-tint: #fafbfc;
    --border-color: rgba(0, 0, 0, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-apple: 0 12px 48px rgba(0, 0, 0, 0.15);
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f5f5f7;
        --text-secondary: #a1a1a6;
        --bg-white: #000000;
        --bg-surface: #1c1c1e;
        --bg-tint: #141414;
        --border-color: rgba(255, 255, 255, 0.1);
        --gradient-vertical: linear-gradient(180deg, #000000 0%, #0a0a0f 100%);
    }
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display', 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    background: var(--bg-white);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: -0.01em;
}

/* Navigation Bar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
    transition: all 0.3s ease;
}

@media (prefers-color-scheme: dark) {
    .navbar {
        background: rgba(0, 0, 0, 0.8);
        border-bottom-color: rgba(255, 255, 255, 0.1);
    }
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 18px;
    letter-spacing: -0.3px;
    transition: opacity 0.2s ease;
}

.nav-logo:hover {
    opacity: 0.8;
}

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

.nav-logo-text {
    font-weight: 600;
}

.nav-links {
    display: flex;
    gap: 8px;
    align-items: center;
}

.nav-link {
    padding: 10px 20px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.2s ease;
    letter-spacing: -0.1px;
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-surface);
}

.nav-link.active {
    color: var(--gradient-start);
    background: rgba(79, 195, 247, 0.1);
}

@media (max-width: 768px) {
    .nav-container {
        padding: 12px 20px;
    }
    
    .nav-logo-text {
        display: none;
    }
    
    .nav-links {
        gap: 4px;
    }
    
    .nav-link {
        padding: 8px 12px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 10px 16px;
    }
    
    .nav-link {
        padding: 8px 10px;
        font-size: 13px;
    }
}

/* Hero Section */
header {
    padding: 140px 20px 120px;
    text-align: center;
    background: var(--gradient-vertical);
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    text-align: center;
}

.app-icon {
    display: block;
    margin: 0 auto 48px;
    padding: 0;
    border: none;
    background: transparent;
    box-shadow: none;
    outline: none;
    width: 160px;
    height: 160px;
    object-fit: contain;
    object-position: center;
}

h1 {
    font-size: 80px;
    font-weight: 700;
    letter-spacing: -3px;
    margin-bottom: 24px;
    color: var(--text-primary);
    line-height: 1.05;
    font-weight: 600;
}

.tagline {
    font-size: 26px;
    color: var(--text-secondary);
    font-weight: 300;
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.5;
    letter-spacing: -0.3px;
}

.hero-subtitle {
    font-size: 19px;
    color: var(--text-secondary);
    font-weight: 400;
    max-width: 600px;
    margin: 28px auto 0;
    line-height: 1.6;
    font-weight: 400;
}

/* Main Content */
main {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

/* Features Section */
.features-section {
    background: var(--bg-white);
    padding: 120px 20px;
}

.section-title {
    font-size: 52px;
    font-weight: 600;
    letter-spacing: -2px;
    text-align: center;
    margin-bottom: 20px;
    color: var(--text-primary);
    line-height: 1.1;
}

.section-subtitle {
    font-size: 22px;
    color: var(--text-secondary);
    text-align: center;
    max-width: 640px;
    margin: 0 auto 100px;
    line-height: 1.6;
    font-weight: 400;
    letter-spacing: -0.2px;
}

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 48px 40px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border-color);
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-light);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    border-color: var(--gradient-start);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: 18px;
    background: var(--gradient-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 28px;
    font-size: 32px;
    box-shadow: var(--shadow-sm);
}

.feature-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    line-height: 1.3;
}

.feature-description {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.7;
    font-weight: 400;
}

/* App Preview Section */
.app-preview {
    background: var(--bg-tint);
    padding: 120px 20px;
}

.preview-container {
    display: flex;
    gap: 48px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
}

.preview-box {
    flex: 1;
    min-width: 300px;
    max-width: 500px;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);
    border-radius: 24px;
    padding: 60px 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.8);
    text-align: center;
    position: relative;
    overflow: hidden;
}

@media (prefers-color-scheme: dark) {
    .preview-box {
        background: rgba(28, 28, 30, 0.7);
        border-color: rgba(255, 255, 255, 0.1);
    }
}

.preview-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-light);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

.preview-box h3 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    letter-spacing: -0.3px;
}

.preview-box p {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Buttons Section */
.buttons-section {
    background: var(--bg-white);
    text-align: center;
    padding: 120px 20px;
}

.buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.buttons-primary {
    margin-bottom: 32px;
}

.btn {
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 17px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    letter-spacing: -0.2px;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-light);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 195, 247, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 195, 247, 0.35);
}

.btn-secondary {
    background: var(--bg-white);
    color: var(--text-primary);
    border: 1.5px solid var(--border-color);
    font-weight: 500;
}

.btn-secondary:hover {
    background: var(--bg-surface);
    border-color: var(--gradient-start);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.btn-coming-soon {
    background: var(--gradient-light);
    color: white;
    cursor: not-allowed;
    border: none;
    box-shadow: 0 4px 12px rgba(79, 195, 247, 0.25);
    font-weight: 500;
}

.btn-coming-soon:hover {
    background: var(--gradient-light);
    box-shadow: 0 6px 20px rgba(79, 195, 247, 0.35);
    transform: translateY(-2px);
}

/* Footer */
footer {
    background: var(--bg-surface);
    padding: 80px 20px;
    text-align: center;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    gap: 32px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    transition: color 0.3s ease;
    font-weight: 400;
}

.footer-link:hover {
    color: var(--gradient-start);
}

.footer-copyright {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 16px;
    font-weight: 400;
}

.footer-brand {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 8px;
    font-weight: 400;
}

/* Responsive */
@media (max-width: 1024px) {
    .features {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    header {
        padding: 100px 20px 80px;
    }
    
    .app-icon {
        width: 140px;
        height: 140px;
        margin-bottom: 40px;
    }
    
    h1 {
        font-size: 64px;
        letter-spacing: -2.5px;
        margin-bottom: 20px;
    }
    
    .tagline {
        font-size: 22px;
    }
    
    .hero-subtitle {
        font-size: 17px;
        margin-top: 24px;
    }
    
    .section-title {
        font-size: 44px;
        letter-spacing: -1.5px;
    }
    
    .section-subtitle {
        font-size: 19px;
        margin-bottom: 80px;
    }
    
    .features-section,
    .app-preview,
    .buttons-section {
        padding: 80px 20px;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .feature-card {
        padding: 40px 32px;
    }
    
    .preview-container {
        gap: 32px;
    }
    
    .buttons {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }
    
    .btn {
        width: 100%;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 16px;
    }
    
    footer {
        padding: 60px 20px;
    }
}

@media (max-width: 480px) {
    header {
        padding: 80px 20px 60px;
    }
    
    .app-icon {
        width: 120px;
        height: 120px;
        margin-bottom: 32px;
    }
    
    h1 {
        font-size: 52px;
        letter-spacing: -2px;
        margin-bottom: 16px;
    }
    
    .tagline {
        font-size: 20px;
    }
    
    .hero-subtitle {
        font-size: 16px;
        margin-top: 20px;
    }
    
    .section-title {
        font-size: 38px;
        letter-spacing: -1px;
    }
    
    .section-subtitle {
        font-size: 17px;
        margin-bottom: 60px;
    }
    
    .features-section,
    .app-preview,
    .buttons-section {
        padding: 60px 20px;
    }
    
    .feature-card {
        padding: 32px 24px;
    }
    
    .feature-icon {
        width: 56px;
        height: 56px;
        font-size: 28px;
        margin-bottom: 24px;
    }
    
    .feature-title {
        font-size: 22px;
    }
    
    .feature-description {
        font-size: 16px;
    }
    
    .preview-box {
        padding: 40px 24px;
    }
    
    footer {
        padding: 50px 20px;
    }
}