:root {
    --primary-color: #007AFF;
    --primary-hover: #0056b3;
    --bg-color: #FBFBFD;
    --surface-color: #FFFFFF;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --border-color: rgba(0, 0, 0, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3 {
    letter-spacing: -0.03em;
    font-weight: 600;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.logo-icon {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 100px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.1rem;
    font-weight: 600;
}

/* Hero Section */
.hero {
    padding-top: 120px;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin-bottom: 60px;
    animation: fade-up 0.8s ease-out forwards;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 100px;
    background: rgba(0, 122, 255, 0.1);
    color: var(--primary-color);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-title {
    font-size: clamp(3rem, 6vw, 4.5rem);
    line-height: 1.05;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #1D1D1F 0%, #434345 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-visual {
    width: 100%;
    max-width: 1000px;
    perspective: 1000px;
}

/* App Screenshots */
.screenshots-container {
    display: flex;
    justify-content: center;
    gap: 30px;
    align-items: center;
    position: relative;
    padding-top: 40px;
}

.app-screenshot {
    width: 260px;
    height: auto;
    border-radius: 24px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.15), 0 0 0 1px var(--border-color);
    transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.img-1 {
    transform: rotate(-4deg) translateY(10px);
    z-index: 1;
}

.img-2 {
    transform: rotate(4deg) translateY(-10px);
    z-index: 2;
}

.hero:hover .img-1 {
    transform: rotate(-1deg) translateY(0);
}

.hero:hover .img-2 {
    transform: rotate(1deg) translateY(0);
}

/* Features Section */
.features-section {
    padding: 100px 0;
    background: var(--surface-color);
}

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

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

.section-heading h2 {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    line-height: 1.1;
    margin-bottom: 20px;
}

.section-heading p {
    color: var(--text-secondary);
    font-size: 1.15rem;
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.feature-card {
    padding: 40px;
    background: var(--bg-color);
    border-radius: 24px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
}

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

/* Footer */
.footer {
    padding: 60px 0;
    background: #F5F5F7;
    border-top: 1px solid var(--border-color);
}

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

.footer-brand .copyright {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 8px;
}

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

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.85rem;
}
.footer-links a:hover {
    color: var(--text-primary);
}

@keyframes fade-up {
    0% { opacity: 0; transform: translateY(20px); }
    100% { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .screenshots-container { flex-direction: column; gap: 20px; }
    .app-screenshot { width: 80%; }
    .img-1 { transform: rotate(0) translateY(0); }
    .img-2 { transform: rotate(0) translateY(0); }
    .footer-container { flex-direction: column; text-align: center; gap: 24px; }
}