:root {
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-main: #2d3748;
    --accent-color: #ff4757;
    --accent-hover: #e04050;
    --border-color: #e2e8f0;
}
* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Poppins', sans-serif; }
body {
    background-color: var(--bg-color);
    color: var(--text-main);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}
.auth-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 35px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
}
.auth-brand {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--accent-color);
    text-align: center;
    margin-bottom: 25px;
}
.auth-title {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 20px;
    color: #4a5568;
    text-align: center;
}
.form-group { margin-bottom: 20px; position: relative; }
.form-group i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #a0aec0;
}
.form-control {
    width: 100%;
    padding: 12px 12px 12px 42px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s;
}
.form-control:focus { border-color: var(--accent-color); }
.auth-btn {
    width: 100%;
    padding: 12px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}
.auth-btn:hover { background: var(--accent-hover); }
.auth-links {
    margin-top: 20px;
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
}
.auth-links a { color: var(--accent-color); text-decoration: none; font-weight: 500; }
.alert {
    padding: 10px 15px;
    border-radius: 6px;
    font-size: 0.85rem;
    margin-bottom: 15px;
    text-align: center;
}
.alert-danger { background: #fff5f5; color: #e53e3e; border: 1px solid #fed7d7; }
.alert-success { background: #f0fff4; color: #38a169; border: 1px solid #c6f6d5; }