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

body {
font-family: 'Helvetica Neue', Arial, sans-serif;
background: #000;
color: #fff;
min-height: 100vh;
background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
padding: 40px 20px;
}

.container {
max-width: 900px;
margin: 0 auto;
}

.header {
text-align: center;
margin-bottom: 50px;
}

.header h1 {
font-size: 2.5rem;
font-weight: 900;
letter-spacing: 3px;
margin-bottom: 10px;
text-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.header p {
font-size: 1rem;
color: #aaa;
letter-spacing: 2px;
text-transform: uppercase;
}

.back-link {
display: inline-block;
margin-bottom: 30px;
color: #667eea;
text-decoration: none;
font-size: 1rem;
transition: all 0.3s ease;
}

.back-link:hover {
color: #764ba2;
transform: translateX(-5px);
}

.vault-grid {
display: flex;
flex-direction: column;
gap: 20px;
max-width: 700px;
margin: 0 auto;
}

.vault-card {
background: rgba(255, 255, 255, 0.05);
border: 2px solid rgba(255, 255, 255, 0.1);
border-radius: 12px;
padding: 30px;
text-align: center;
text-decoration: none;
color: #fff;
transition: all 0.3s ease;
position: relative;
overflow: hidden;
}

.vault-card::before {
content: '';
position: absolute;
top: 0;
left: -100%;
width: 100%;
height: 100%;
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
transition: left 0.3s ease;
z-index: -1;
}

.vault-card:hover {
transform: translateY(-5px);
border-color: rgba(102, 126, 234, 0.6);
box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.vault-card:hover::before {
left: 0;
}

.vault-card:nth-child(1):hover::before {
background: linear-gradient(135deg, #777777 0%, #5a5a5a 50%, #333333 100%);
}

.vault-card:nth-child(2):hover::before {
background: linear-gradient(135deg, #FF0000 0%, #FF7F00 16.67%, #FFFF00 33.33%, #00FF00 50%, #0000FF 66.67%, #4B0082 83.33%, #9400D3 100%);
}

.vault-card:nth-child(3):hover::before {
background: linear-gradient(135deg, #FF0000 0%, #CC0000 50%, #8B0000 100%);
}

.vault-icon {
margin-bottom: 15px;
display: flex;
justify-content: center;
align-items: center;
}

.vault-icon img {
max-width: 100%;
height: auto;
max-height: 120px;
border-radius: 8px;
}

.vault-card h3 {
font-size: 1.3rem;
margin-bottom: 10px;
letter-spacing: 1px;
}

.vault-card p {
font-size: 0.9rem;
color: #aaa;
line-height: 1.4;
}

footer {
text-align: center;
color: #666;
font-size: 0.85rem;
margin-top: 60px;
padding-top: 20px;
padding-bottom: 20px;
border-top: 1px solid rgba(255, 255, 255, 0.1);
}

footer a {
color: #667eea;
text-decoration: none;
transition: color 0.3s ease;
}

footer a:hover {
color: #764ba2;
}

footer p {
margin-bottom: 10px;
}

@media (max-width: 768px) {
body {
padding: 30px 15px;
}
.header h1 {
font-size: 2rem;
letter-spacing: 2px;
}
.header p {
font-size: 0.85rem;
}
}

@media (max-width: 480px) {
.header h1 {
font-size: 1.75rem;
}
.vault-card {
padding: 20px;
}
}