:root {
    --bg-dark: #050505;
    --bg-gradient: radial-gradient(circle at 50% 0%, #1a1a2e 0%, #050505 100%);
    --primary: #00f0ff;
    --secondary: #7000ff;
    --text-main: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.6);
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glow: 0 0 20px rgba(0, 240, 255, 0.3);
}

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

body {
    font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
    background: var(--bg-dark);
    background-image: var(--bg-gradient);
    min-height: 100vh;
    color: var(--text-main);
    overflow-x: hidden;
}

nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(10, 10, 20, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 18px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

nav .logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

nav .logo span {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
    font-size: 20px;
}

nav .nav-links { display: flex; gap: 15px; flex-wrap: wrap; }

nav a {
    color: var(--text-muted);
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

nav a:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 120px 40px 40px;
    animation: fadeIn 1s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

h1, h2 {
    font-size: 48px;
    margin-bottom: 20px;
    text-align: center;
    line-height: 1.2;
}

h2 { font-size: 36px; }

h3 { font-size: 22px; margin: 20px 0 15px; color: var(--primary); }

p { font-size: 16px; line-height: 1.6; color: var(--text-muted); margin-bottom: 20px; }

.cipher-text {
    font-family: 'Courier New', monospace;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--primary);
    text-shadow: var(--glow);
    cursor: default;
    display: block;
    width: 100%;
    overflow: visible !important;
    white-space: normal !important;
    word-wrap: break-word;
}

.cipher-text:hover {
    color: #fff;
    text-shadow: 0 0 30px rgba(0, 240, 255, 0.6);
}

.card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    margin: 20px 0;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: visible;
}

.card:hover {
    border-color: rgba(0, 240, 255, 0.2);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), var(--glow);
    transform: translateY(-5px);
}

button, .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #000;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

button:hover, .btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 30px rgba(0, 240, 255, 0.4);
    color: #fff;
}

.btn-success { background: linear-gradient(135deg, #00ff88, #00cc6a); }
.btn-danger { background: linear-gradient(135deg, #ff416c, #ff4b2b); color: #fff; }

.flash-messages {
    background: rgba(255, 65, 108, 0.1);
    border: 1px solid rgba(255, 65, 108, 0.3);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 24px;
    list-style: none;
    color: #ff8fa3;
    font-size: 14px;
    text-align: center;
}

.qr-container {
    background: #fff;
    border-radius: 20px;
    padding: 24px;
    text-align: center;
    margin: 30px auto;
    max-width: 350px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.qr-container img { border-radius: 12px; width: 100%; max-width: 250px; }
.qr-container h3, .qr-container p { color: #000; text-align: center; }

.secret-key {
    background: rgba(0, 0, 0, 0.05);
    border: 1px dashed #000;
    border-radius: 8px;
    padding: 12px;
    font-family: 'Courier New', monospace;
    font-size: 16px;
    font-weight: bold;
    color: #333;
    word-break: break-all;
    margin: 15px 0;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes pulse {
    0%, 100% { opacity: 0.4; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.3); }
}

@media (max-width: 768px) {
    h1 { font-size: 28px; }
    h2 { font-size: 24px; }
    nav { padding: 15px 20px; }
    nav a { font-size: 12px; padding: 8px 12px; }
    .container { padding: 100px 20px 20px; }
}