:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #ec4899;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --success: #10b981;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background: var(--bg-gradient);
    min-height: 100vh;
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem 1rem;
}

.container {
    max-width: 600px;
    width: 100%;
    margin: 0 auto;
}

.card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* Header */
header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.8s ease-out;
}

.app-icon {
    width: 120px;
    height: 120px;
    border-radius: 28px;
    margin-bottom: 1.5rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
    border: 4px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.3s ease;
}

.app-icon:hover {
    transform: scale(1.05);
}

h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

/* Steps */
.step-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.step {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 1.5rem;
    border-radius: 16px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.step:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.1);
}

.step-number {
    position: absolute;
    top: -10px;
    right: -10px;
    font-size: 4rem;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.03);
    line-height: 1;
    pointer-events: none;
}

.step-label {
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--secondary);
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: block;
}

.step h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.step p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 1rem;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.4);
    transform: translateY(-1px);
}

.btn-group {
    background: white;
    color: #0f172a;
}

.btn-group:hover {
    background: #f1f5f9;
}

.btn-store {
    background: linear-gradient(to right, #10b981, #059669);
    color: white;
}

.btn-store:hover {
    filter: brightness(1.1);
}

/* Alert Box */
.alert-box {
    margin-top: 2rem;
    background: rgba(236, 72, 153, 0.1);
    border: 1px solid rgba(236, 72, 153, 0.2);
    border-radius: 16px;
    padding: 1rem 1.5rem;
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.alert-icon {
    font-size: 1.5rem;
}

.alert-content h4 {
    color: var(--secondary);
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
}

.alert-content p {
    font-size: 0.85rem;
    color: #fce7f3;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 3rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

footer a {
    color: var(--text-muted);
    text-decoration: underline;
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile Tweaks */
@media (max-width: 480px) {
    .card {
        padding: 1.5rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .app-icon {
        width: 80px;
        height: 80px;
    }
}