:root {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: rgba(148, 163, 184, 0.1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: radial-gradient(circle at top right, #1e293b, #0f172a);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 40px;
    width: 100%;
    max-width: 450px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.auth-header i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.auth-header h1 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.auth-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.form-input {
    width: 100%;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px 18px;
    color: var(--text-main);
    font-size: 1rem;
    transition: all 0.3s;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.btn-primary {
    width: 100%;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 14px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 10px;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

.auth-footer {
    margin-top: 30px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.alert {
    padding: 14px;
    border-radius: 12px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    text-align: center;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #fca5a5;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: #6ee7b7;
}