:root {
    --primary: #ff0000;
    --dark: #050505;
    --glass: rgba(255, 255, 255, 0.05);
    --border: rgba(255, 255, 255, 0.1);
    --text: #ffffff;
}

body {
    background: radial-gradient(circle at top right, #220000, #050505);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Inter', sans-serif;
    color: var(--text);
    margin: 0;
}

.login-container { width: 100%; max-width: 450px; padding: 20px; }

.back-link {
    color: #888;
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 20px;
    display: inline-block;
    transition: 0.3s;
}
.back-link:hover { color: var(--primary); }

.login-box {
    background: var(--glass);
    backdrop-filter: blur(20px);
    padding: 40px;
    border-radius: 24px;
    border: 1px solid var(--border);
    box-shadow: 0 25px 50px rgba(0,0,0,0.5);
}

.login-header { text-align: center; margin-bottom: 30px; }
.logo { font-size: 1.8rem; font-weight: 900; letter-spacing: -1px; text-transform: uppercase; }
.logo span { color: var(--primary); }
.login-header p { color: #888; font-size: 0.9rem; margin-top: 5px; }

/* Tabs */
.tab-container {
    display: flex;
    background: rgba(0,0,0,0.3);
    padding: 5px;
    border-radius: 12px;
    margin-bottom: 30px;
}
.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: #888;
    padding: 10px;
    cursor: pointer;
    font-weight: 600;
    transition: 0.3s;
    border-radius: 8px;
}
.tab-btn.active { background: var(--primary); color: white; }

/* Inputs */
.input-group { margin-bottom: 20px; }
.input-group label { display: block; font-size: 0.85rem; color: #aaa; margin-bottom: 8px; }
.input-group input {
    width: 100%;
    padding: 14px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: white;
    outline: none;
    transition: 0.3s;
}
.input-group input:focus { border-color: var(--primary); background: rgba(255,255,255,0.08); }

.form-options {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: #888;
    margin-bottom: 30px;
}
.form-options a { color: var(--primary); text-decoration: none; }

.btn-auth {
    width: 100%;
    padding: 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-weight: 800;
    text-transform: uppercase;
    cursor: pointer;
    transition: 0.3s;
    box-shadow: 0 10px 20px rgba(255, 0, 0, 0.2);
}
.btn-auth:hover { background: #cc0000; transform: translateY(-2px); }

@media (max-width: 480px) {
    .login-box { padding: 30px 20px; }
}