:root {
    --primary-color: #1565C0;
    --secondary-color: #1E88E5;
    --accent-color: #90CAF9;
    --bg-color: #f8faff;
    --text-color: #2c3e50;
    --light-text: #607d8b;
    --card-bg: #ffffff;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

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

/* Header & Nav */
header {
    background: white;
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--primary-color);
}

.logo img {
    width: 40px;
    height: 40px;
}

.lang-switch {
    display: flex;
    gap: 8px;
}

.lang-btn {
    background: none;
    border: 1px solid #ddd;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s;
}

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

/* Hero Section */
.hero {
    padding: 80px 0;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--light-text);
    max-width: 600px;
    margin: 0 auto 30px;
}

.cta-btn {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 15px 35px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    box-shadow: 0 10px 20px rgba(21, 101, 192, 0.2);
    transition: transform 0.2s;
}

.cta-btn:hover {
    transform: translateY(-2px);
}

/* Features */
.features {
    padding: 60px 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

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

.feature-card h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

/* Footer */
footer {
    padding: 60px 0 30px;
    text-align: center;
    border-top: 1px solid #eee;
    margin-top: 60px;
}

.footer-links {
    margin-bottom: 20px;
}

.footer-links a {
    color: var(--light-text);
    text-decoration: none;
    margin: 0 15px;
}

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

.copyright {
    font-size: 0.9rem;
    color: #999;
}

/* Screenshots Section */
.screenshots {
    padding: 60px 0;
    text-align: center;
}

.screenshots .section-title {
    font-size: 2.2rem;
    margin-bottom: 45px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
    justify-content: center;
}

.screenshot-card {
    background: var(--card-bg);
    padding: 24px 20px;
    border-radius: 24px;
    box-shadow: var(--shadow);
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.screenshot-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 38px rgba(0,0,0,0.12);
}

.device-frame {
    width: 100%;
    max-width: 200px;
    aspect-ratio: 460 / 1024;
    border: 8px solid #1e293b;
    border-radius: 28px;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    margin-bottom: 20px;
    background: #0f172a;
    position: relative;
}

/* Smartphone Notch Mockup */
.device-frame::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 70px;
    height: 14px;
    background: #1e293b;
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
    z-index: 10;
}

.device-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.screenshot-card:hover .device-frame img {
    transform: scale(1.04);
}

.screenshot-card h3 {
    font-size: 1.15rem;
    color: var(--primary-color);
    margin-bottom: 8px;
    font-weight: 600;
}

.screenshot-card p {
    font-size: 0.9rem;
    color: var(--light-text);
    text-align: center;
    line-height: 1.4;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .screenshots-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        gap: 20px;
    }
}