* {margin:0;padding:0;box-sizing:border-box}
:root {
    --primary: #667eea;
    --secondary: #764ba2;
    --success: #00ff88;
    --warning: #ffa500;
    --danger: #ff4757;
    --dark: #1a1a2e;
    --text: #eee;
}
body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    min-height: 100vh;
    color: var(--text);
}
.nav {
    background: rgba(0,0,0,0.95);
    padding: 22px 0;
    box-shadow: 0 6px 25px rgba(0,0,0,0.6);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-logo {font-size: 2rem;font-weight: 900;color: #fff}
.nav-links {display: flex;gap: 35px;list-style: none;align-items: center}
.nav-links a {color: var(--text);text-decoration: none;font-weight: 700;font-size: 1.05rem;transition: color 0.3s}
.nav-links a:hover {color: #fff}
.container {max-width: 1400px;margin: 60px auto;padding: 0 25px}
.card {
    background: rgba(0,0,0,0.85);
    border-radius: 22px;
    padding: 45px;
    margin-bottom: 35px;
    border: 2px solid rgba(255,255,255,0.15);
    backdrop-filter: blur(15px);
}
.card h2 {color: #fff;margin-bottom: 28px;font-size: 2.2rem}
.card h3 {color: #fff;margin-bottom: 20px;font-size: 1.7rem}
.btn {
    padding: 16px 40px;
    background: #fff;
    color: var(--primary);
    border: none;
    border-radius: 32px;
    font-weight: 800;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}
.btn:hover {transform: translateY(-4px);box-shadow: 0 12px 35px rgba(255,255,255,0.45)}
.btn-success {background: var(--success);color: #000}
.btn-danger {background: var(--danger);color: #fff}
.btn-block {width: 100%;text-align: center}
.btn-sm {padding: 11px 24px;font-size: 0.95rem}
.form-group {margin-bottom: 28px}
.form-group label {display: block;margin-bottom: 10px;color: var(--text);font-weight: 700;font-size: 1.05rem}
input, select, textarea {
    width: 100%;
    padding: 16px;
    background: rgba(0,0,0,0.6);
    border: 2px solid rgba(255,255,255,0.25);
    color: #fff;
    border-radius: 12px;
    font-size: 1.05rem;
    font-family: inherit;
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: #fff;
    box-shadow: 0 0 22px rgba(255,255,255,0.35);
}
input[type="color"] {
    height: 55px;
    cursor: pointer;
    padding: 6px;
}
textarea {resize: vertical;min-height: 110px}
.grid {display: grid;gap: 25px}
.grid-2 {grid-template-columns: 1fr 1fr}
.grid-3 {grid-template-columns: 1fr 1fr 1fr}
.grid-4 {grid-template-columns: repeat(4, 1fr)}
.qr-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}
.qr-card {
    background: rgba(255,255,255,0.08);
    border-radius: 18px;
    padding: 28px;
    text-align: center;
    border: 2px solid rgba(255,255,255,0.15);
    transition: all 0.3s;
    cursor: pointer;
}
.qr-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
    box-shadow: 0 15px 40px rgba(102,126,234,0.4);
}
.qr-preview {
    width: 100%;
    max-width: 220px;
    height: 220px;
    margin: 18px auto;
    background: #fff;
    border-radius: 12px;
    padding: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.qr-preview img {
    max-width: 100%;
    max-height: 100%;
}
.qr-card h4 {color: #fff;margin: 18px 0 12px;font-size: 1.4rem}
.qr-card p {color: var(--text);font-size: 0.95rem;margin-bottom: 18px}
.qr-meta {
    display: flex;
    justify-content: space-around;
    margin: 18px 0;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.15);
}
.qr-meta-item {text-align: center}
.qr-meta-label {font-size: 0.85rem;color: rgba(255,255,255,0.6)}
.qr-meta-value {font-size: 1.1rem;color: #fff;font-weight: 700;margin-top: 5px}
.badge {
    display: inline-block;
    padding: 7px 18px;
    border-radius: 18px;
    font-size: 0.9rem;
    font-weight: 700;
    margin: 6px;
}
.badge-url {background: #3b82f6;color: #fff}
.badge-text {background: #10b981;color: #fff}
.badge-payment {background: #f59e0b;color: #fff}
.badge-product {background: #8b5cf6;color: #fff}
.badge-download {background: #06b6d4;color: #fff}
.badge-book {background: #ec4899;color: #fff}
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 25px;
}
.auth-container {
    background: rgba(0,0,0,0.9);
    padding: 55px;
    border-radius: 25px;
    max-width: 550px;
    width: 100%;
    border: 3px solid rgba(255,255,255,0.2);
}
.auth-logo {text-align: center;font-size: 3.5rem;margin-bottom: 35px}
.message {
    padding: 22px;
    border-radius: 12px;
    margin-bottom: 28px;
    border-left: 6px solid;
    font-weight: 600;
}
.message.success {background: rgba(0, 255, 136, 0.2);border-color: var(--success);color: var(--success)}
.message.error {background: rgba(255, 71, 87, 0.2);border-color: var(--danger);color: var(--danger)}
.message.info {background: rgba(102, 126, 234, 0.2);border-color: var(--primary);color: #fff}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}
.stat-card {
    background: rgba(255,255,255,0.08);
    padding: 32px;
    border-radius: 18px;
    text-align: center;
    border: 2px solid rgba(255,255,255,0.15);
}
.stat-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--success);
    margin: 12px 0;
}
.stat-label {
    color: var(--text);
    font-size: 1rem;
    font-weight: 600;
}
.color-group {
    display: flex;
    gap: 18px;
    align-items: flex-end;
}
.preview-area {
    background: rgba(255,255,255,0.95);
    border-radius: 18px;
    padding: 35px;
    text-align: center;
    margin: 30px 0;
}
.preview-qr {
    max-width: 400px;
    margin: 0 auto;
}
@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 {grid-template-columns: 1fr}
    .qr-grid {grid-template-columns: 1fr}
    .color-group {flex-direction: column;align-items: stretch}
}