:root {
    --primary: #0563bb;
    --primary-dark: #4f46e5;
    --text: #1e293b;
    --text-light: #64748b;
    --bg: #ffffff;
    --card-bg: #f8fafc;
    --border: #e2e8f0;
    --error: #ef4444;
    --success: #10b981;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, sans-serif;
}

body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--bg);
    color: var(--text);
    overflow-x: hidden;
}

.login-form {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 16px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border);
    margin: 20px 0;
    position: relative; /* Для backdrop-filter */
}

.login-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    backdrop-filter: blur(5px);
    z-index: -1;
    border-radius: 16px;
}

.login-form h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1.75rem;
    background: linear-gradient(90deg, var(--primary), #a855f7);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.form-group {
    margin-bottom: 1.25rem;
    position: relative;
}

.login-form input {
    width: 100%;
    padding: 14px 42px 14px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--bg);
    color: var(--text);
    transition: border-color 0.3s, box-shadow 0.3s;
}

.login-form input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.login-form input.is-invalid {
    border-color: var(--error);
}

.login-form input.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}

.login-form button[type="submit"] {
    background: linear-gradient(45deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    padding: 14px;
    width: 100%;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    margin-top: 0.5rem;
    transition: transform 0.2s, box-shadow 0.3s;
}

.login-form button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.4);
}

.login-form button[type="submit"]:active {
    transform: translateY(0);
}

.password-wrapper {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-light);
    font-size: 1.1rem;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.password-toggle:hover {
    color: var(--primary);
}

.invalid-feedback {
    color: var(--error);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: block;
}

.form-footer {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-light);
}

.form-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.form-footer a:hover {
    text-decoration: underline;
    color: var(--primary-dark);
}

@media (max-width: 480px) {
    .login-form {
        padding: 1.75rem;
    }

    .login-form h2 {
        font-size: 1.5rem;
    }

    .login-form input {
        padding: 12px 38px 12px 14px;
    }
}