:root {
    --primary: #0046ff;
    --primary-glow: rgba(0, 70, 255, 0.5);
    --secondary: #6366f1;
    --bg: #020617;
    --card-bg: rgba(15, 23, 42, 0.6);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background: var(--bg);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Gradients */
.bg-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: 
        radial-gradient(circle at 10% 20%, rgba(0, 70, 255, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(99, 102, 241, 0.15) 0%, transparent 40%);
}

.container {
    padding: 20px;
    max-width: 500px;
    margin: 0 auto;
}

/* Header & Menu */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.menu-btn {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Glass Cards */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.3);
}

.hero {
    text-align: center;
    padding: 40px 0;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* Video Player */
.video-container {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    background: #000;
    aspect-ratio: 16 / 9;
}

video {
    width: 100%;
    height: 100%;
}

/* Steps */
.steps-list {
    list-style: none;
}

.step-item {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
}

.step-number {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
    box-shadow: 0 0 15px var(--primary-glow);
}

/* Download Button */
.btn-download {
    display: block;
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    text-align: center;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    border-radius: 16px;
    box-shadow: 0 8px 20px rgba(0, 70, 255, 0.4);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-download:active {
    transform: scale(0.97);
}

/* Version Info */
.version-info {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 40px;
    margin-bottom: 20px;
}

/* Mobile Nav Overlay */
.nav-overlay {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100%;
    background: var(--bg);
    z-index: 100;
    transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 60px 40px;
    border-left: 1px solid var(--glass-border);
}

.nav-overlay.active {
    right: 0;
}

.nav-links {
    list-style: none;
}

.nav-links li {
    margin-bottom: 24px;
}

.nav-links a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 600;
}

.overlay-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 2rem;
}