:root {
    --primary-color: #06b6d4;
    --secondary-color: #0891b2;
    --accent-color: #22d3ee;
    --gold-accent: #10b981;
    --bg-color: #0b1329;
    --card-bg: #111b35;
    --text-color: #f8fafc;
    --light-text: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.08);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* {
    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;
    overflow-x: hidden;
}

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

/* Header & Nav */
header {
    background: rgba(11, 19, 41, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    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(--text-color);
}

.logo img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

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

.lang-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--light-text);
    padding: 6px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.8rem;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
}

.lang-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.45);
}

/* Hero Section */
.hero {
    padding: 100px 0 60px;
    text-align: center;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
    z-index: -1;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 20px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-color) 30%, var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1px;
}

.hero p {
    font-size: 1.3rem;
    color: var(--light-text);
    max-width: 600px;
    margin: 0 auto 40px;
    font-weight: 400;
}

.cta-btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 16px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.05rem;
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.35);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(37, 99, 235, 0.5);
}

/* Features */
.features {
    padding: 60px 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--card-bg);
    padding: 35px 30px;
    border-radius: 24px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    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;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
    opacity: 0.8;
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: rgba(96, 165, 250, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.45);
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-color);
    font-weight: 700;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--light-text);
    line-height: 1.6;
}

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

.screenshots .section-title {
    font-size: 2.5rem;
    margin-bottom: 50px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-color), var(--light-text));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 35px;
    justify-content: center;
}

.screenshot-card {
    background: var(--card-bg);
    padding: 24px 20px;
    border-radius: 28px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.screenshot-card:hover {
    transform: translateY(-10px);
    border-color: rgba(96, 165, 250, 0.25);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.55);
}

.device-frame {
    width: 100%;
    max-width: 200px;
    aspect-ratio: 460 / 1024;
    border: 10px solid #1e293b;
    border-radius: 32px;
    overflow: hidden;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
    margin-bottom: 20px;
    background: #0f172a;
    position: relative;
}

/* Smartphone Notch Mockup */
.device-frame::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 76px;
    height: 16px;
    background: #1e293b;
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
    z-index: 10;
}

.device-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.screenshot-card:hover .device-frame img {
    transform: scale(1.05);
}

.screenshot-card h3 {
    font-size: 1.2rem;
    color: var(--text-color);
    margin-bottom: 8px;
    font-weight: 700;
}

.screenshot-card p {
    font-size: 0.9rem;
    color: var(--light-text);
    text-align: center;
    line-height: 1.5;
}

/* Footer */
footer {
    padding: 60px 0 40px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 80px;
}

.footer-links {
    margin-bottom: 25px;
}

.footer-links a {
    color: var(--light-text);
    text-decoration: none;
    font-weight: 600;
    margin: 0 20px;
    transition: color 0.2s;
}

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

.copyright {
    font-size: 0.9rem;
    color: #475569;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 3rem; }
    .hero p { font-size: 1.15rem; }
    .screenshots-grid {
        grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
        gap: 24px;
    }
}