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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #581c87 50%, #0f172a 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

.banner-ad {
    width: 100%;
    max-width: 900px;
    background: rgba(255,255,255,0.05);
    border: 1px dashed rgba(255,255,255,0.2);
    border-radius: 12px;
    padding: 14px;
    text-align: center;
    color: rgba(255,255,255,0.4);
    font-size: 13px;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 8px 0;
}

.logo-area {
    text-align: center;
    margin: 32px 0 28px;
}

.logo-area h1 {
    font-size: 52px;
    font-weight: 800;
    background: linear-gradient(135deg, #a855f7, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-area p {
    color: #cbd5e1;
    font-size: 16px;
    margin-top: 8px;
}

.auth-card {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 36px;
    width: 100%;
    max-width: 440px;
    border: 1px solid rgba(255,255,255,0.2);
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    margin-bottom: 16px;
}

.tab-buttons {
    display: flex;
    background: rgba(0,0,0,0.3);
    border-radius: 14px;
    padding: 4px;
    margin-bottom: 28px;
}

.tab-btn {
    flex: 1;
    padding: 11px;
    border: none;
    border-radius: 11px;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s;
    background: transparent;
    color: rgba(255,255,255,0.5);
}

.tab-btn.active {
    background: linear-gradient(135deg, #a855f7, #ec4899);
    color: white;
}

.tab-pane { display: none; }
.tab-pane.active { display: block; }

.form-group { margin-bottom: 18px; }

.form-group label {
    display: block;
    color: rgba(255,255,255,0.8);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 7px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input {
    width: 100%;
    padding: 13px 16px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 12px;
    color: white;
    font-size: 15px;
    outline: none;
    transition: border-color 0.3s, background 0.3s;
}

.form-group input::placeholder { color: rgba(255,255,255,0.3); }
.form-group input:focus {
    border-color: #a855f7;
    background: rgba(168,85,247,0.1);
}

.btn-primary {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #a855f7, #ec4899);
    border: none;
    border-radius: 12px;
    color: white;
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 6px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(168,85,247,0.5);
}

.alert {
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 13px;
    margin-top: 14px;
    display: none;
}

.alert-error {
    background: rgba(239,68,68,0.15);
    border: 1px solid rgba(239,68,68,0.3);
    color: #fca5a5;
}

.alert-success {
    background: rgba(16,185,129,0.15);
    border: 1px solid rgba(16,185,129,0.3);
    color: #6ee7b7;
}

.demo-hint {
    text-align: center;
    color: rgba(255,255,255,0.4);
    font-size: 12px;
    margin-top: 16px;
}

.demo-hint b { color: rgba(168,85,247,0.8); }