*, *::before, *::after {
    margin: 0; padding: 0; box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.main-start-container {
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100vh;
    background: linear-gradient(135deg, #0d1117, #161b22);
    display: flex;
    justify-content: center;
    align-items: center;
    color: #c9d1d9;
    user-select: none;
}

.main-start-container .auth-wrapper {
    background: #161b22;
    padding: 2.5rem 3rem;
    border-radius: 16px;
    box-shadow: 0 5px 25px #0366d666;
    width: 100%;
    max-width: 400px;
    animation: fadeSlideIn 0.8s cubic-bezier(0.23, 1, 0.32, 1) forwards;
    opacity: 0;
    /*transform: translateY(30px);*/
    transition: 0.2s;
}

@keyframes fadeSlideIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.main-start-container h1 {
    font-weight: 600;
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
    color: #58a6ff;
    letter-spacing: 1px;
}

.main-start-container form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    text-align: center;
}

.main-start-container form i {
    text-align: center;
    opacity: 0.4;
}

.main-start-container label {
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
    color: #8b949e;
}

.main-start-container input[type="text"],
.main-start-container input[type="password"] {
    padding: 1rem 1.2rem;
    border-radius: 10px;
    border: 2px solid #30363d;
    background: #0d1117;
    color: #c9d1d9;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    outline-offset: 2px;
}

.main-start-container input::placeholder {
    color: #484f58;
    font-weight: 400;
}

.main-start-container input:focus {
    border-color: #58a6ff;
    box-shadow: 0 0 8px 2px rgba(88, 166, 255, 0.6);
    outline: none;
    background: #161b22;
}

.main-start-container .btn-login {
    background: #2381ff;
    color: white;
    padding: 1rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    border: 1px solid #2381ff;
    box-shadow: 0 6px 15px rgba(35, 129, 255, 0.5);
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    user-select: none;
}

.main-start-container .btn-login:hover,
.main-start-container .btn-login:focus {
    background: #1a5fcc;
    box-shadow: 0 8px 20px rgba(26, 95, 204, 0.7);
    /*transform: translateY(-3px);*/
    outline: none;
}

.main-start-container .error-message {
    position: relative;
    color: #f85149;
    font-size: 0.85rem;
    min-height: 1.2rem;
    margin-top: -1rem;
    margin-bottom: 1rem;
    text-align: center;
    user-select: text;
    top: 1.3rem;
}

/* адаптив */
@media (max-width: 480px) {
    .main-start-container .auth-wrapper {
        padding: 2rem 1.5rem;
        border-radius: 12px;
        box-shadow: 0 6px 20px rgba(3, 102, 214, 0.3);
        min-width: 260px;
    }

    .main-start-container h1 {
        font-size: 1.6rem;
        margin-bottom: 1.5rem;
    }

    .main-start-container input[type="text"],
    .main-start-container input[type="password"] {
        font-size: 0.95rem;
        padding: 0.9rem 1rem;
        margin: 5px 5px 0 5px;
    }

    .main-start-container .btn-login {
        font-size: 1rem;
        padding: 0.9rem;
        border-radius: 10px;
    }
}

.main-start-container .but-login-anim {
    position: relative;
    overflow: hidden;
    border: 2px solid #2381ff;
    background-color: #2381ff;
    color: white;
    transition: background-color 0.5s ease, opacity 0.5s ease, color 0.5s ease;
    opacity: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    user-select: none;
    padding: 1rem;
    border-radius: 12px;
}

/* Прозрачность фона, бордер остаётся */
.main-start-container .but-login-anim.transparent-bg {
    background-color: transparent;
    opacity: 1;
    color: transparent;
    pointer-events: none;
}

/* Текст успешного состояния */
.main-start-container .but-login-anim .success-text {
    position: absolute;
    color: #4ade80;
    font-weight: 700;
    font-size: 1.1rem;
    opacity: 0;
    transition: opacity 0.5s ease;
    user-select: none;
    pointer-events: none;
}

/* Показываем текст */
.main-start-container .but-login-anim.show-success .success-text {
    opacity: 1;
    pointer-events: auto;
}