:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --accent-color: #FFC107;
    --text-main: #212121;
    --text-secondary: #757575;
    --bg-light: #F5F5F5;
    --white: #FFFFFF;
    --error: #f44336;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-light);
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: var(--white);
    padding: 15px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo-wrapper {
    display: flex;
    align-items: center;
    text-decoration: none;
    gap: 12px;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s;
}

nav ul li a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
}

.hero-icon {
    width: 120px;
    height: 120px;
    border-radius: 24px;
    background: white;
    padding: 10px;
    margin-bottom: 25px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    font-weight: 800;
}

.hero p {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto 40px;
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    padding: 14px 35px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
    font-size: 1rem;
}

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

.btn-secondary {
    background: transparent;
    border: 2px solid var(--white);
    color: var(--white);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

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

h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: var(--text-main);
}

/* Features List */
.features {
    background: var(--white);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    padding: 30px;
    border-radius: 16px;
    background: var(--bg-light);
    border: 1px solid #eee;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    display: block;
}

.feature-card h3 {
    margin-top: 0;
    color: var(--primary-color);
}

/* Demo Section */
.demo-section {
    background: var(--white);
    text-align: center;
}

.video-container {
    max-width: 350px; /* Shorts are narrow */
    margin: 0 auto;
    border-radius: 30px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    border: 10px solid #222;
    aspect-ratio: 9 / 16;
}

.video-container iframe {
    width: 100%;
    height: 100%;
}

/* Why Section */
.why-section {
    background: #fdfdfd;
}

.why-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
}

.why-item {
    background: var(--white);
    padding: 15px 30px;
    border-radius: 50px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    font-weight: 600;
    color: var(--text-secondary);
}

/* Screenshots Gallery */
.screenshots {
    background: var(--bg-light);
}

.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    padding-top: 20px;
}

.screenshot-item {
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    border: 6px solid #222;
    background: #000;
}

.screenshot-item img {
    width: 100%;
    display: block;
    transition: transform 0.5s;
}

.screenshot-item:hover img {
    transform: scale(1.05);
}

/* Footer */
footer {
    background: var(--white);
    padding: 60px 0;
    text-align: center;
    border-top: 1px solid #eee;
}

footer p {
    color: var(--text-secondary);
}

@media (max-width: 600px) {
    .hero h1 { font-size: 2.25rem; }
    .hero { padding: 60px 0; }
    h2 { font-size: 2rem; }
    nav { flex-direction: column; gap: 15px; }
    .video-container { max-width: 100%; }
}